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Android Google Microsoft Security Spam Yahoo! News

Microsoft Engineer Discovers Android Spam Botnet, Google Denies Claim 152

An anonymous reader writes "Microsoft engineer Terry Zink has discovered Android devices are being used to send spam. He has identified an international Android botnet and outlined the details on his MSDN blog. A closer look at the e-mails' header information shows all the messages come from compromised Yahoo accounts. Furthermore, they are also stamped with the 'Sent from Yahoo! Mail on Android' signature. Google has denied the allegations. 'The evidence does not support the Android botnet claim,' a Google spokesperson said in a statement. 'Our analysis suggests that spammers are using infected computers and a fake mobile signature to try to bypass anti-spam mechanisms in the email platform they're using.'"
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Microsoft Engineer Discovers Android Spam Botnet, Google Denies Claim

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  • by Anonymous Coward on Thursday July 05, 2012 @06:19PM (#40558441)

    Would it kill you to link to MSDN - where the blog entry actually resides? I get the anti-MS sentiment (although jeez, quit living in the 90s), but making readers jump to ZDNet first (or sending them back to /.) is just being passive aggressive.

    • by John3 ( 85454 ) <`john3' `at' `cornells.com'> on Thursday July 05, 2012 @06:34PM (#40558539) Homepage Journal

      Here's [msdn.com] the original blog entry.

    • by Tough Love ( 215404 ) on Thursday July 05, 2012 @08:40PM (#40559357)

      I get the anti-MS sentiment (although jeez, quit living in the 90s)

      Microsoft remains as evil as it ever was, two decades later. Anti-MS sentiment is not only richly deserved, but prudent.

      • by Unoriginal_Nickname ( 1248894 ) on Thursday July 05, 2012 @10:30PM (#40560009)

        Microsoft is evil in the same way that suicide is a sin. We're talking about a company that's only relevant on one doomed platform, choking to death on too many brands and too many failed attempts to enter other markets. Unix is everywhere. Unix beat Microsoft a long time ago.

        Stop poisoning the discourse by giving Microsoft such a disproportionate share of the hate. Adobe's just as bad, and Oracle's a lot worse. Why don't you rail against them? Why don't we talk about how, once Windows is gone, our only practical choice will be between a walled garden or an operating system that's philosophically dominated by the toxic, vapid musings of a man who literally believes that it is better to let your children starve to death than ply your trade as a software developer?

        • by Anonymous Coward

          or an operating system that's philosophically dominated by the toxic, vapid musings of a man who literally believes that it is better to let your children starve to death than ply your trade as a software developer?

          Someone explain to me how the hell an overexagerated, inaccurate ad hominem attack of almost no relevancy gets marked "Insightful?"

          • by Sir_Sri ( 199544 )

            His first sentence plays to the crowd well. Before he goes off the deep end completely.

          • And yet we all obviously know exactly who I'm talking about even though I didn't say a name. Doesn't that tell you something about the state of FOSS?

        • seem to be missing the elephant in the room with your examples of evil companies...

        • by seann ( 307009 )

          I think this comment summarizes the reason I never visit slashdot anymore.

          That and you have to wait for a new page to load when making a comment. Annoying.

        • by nilbog ( 732352 )

          This is the internet. We already complain about everything.

        • by mcgrew ( 92797 ) *

          Stop poisoning the discourse by giving Microsoft such a disproportionate share of the hate. Adobe's just as bad, and Oracle's a lot worse. Why don't you rail against them?

          Because the discussion is about Microsoft. Don't worry, the next Adobe or Oracle article posted will get their share of venom.

          Why don't we talk about how, once Windows is gone, our only practical choice will be between a walled garden or an operating system that's philosophically dominated by the toxic, vapid musings of a man who literally

  • by Anonymous Coward

    and he doesn't realise that any program on any computer on the internet could pretend to be on android? I don't know much about mail but I would guess the"'Sent from Yahoo! Mail on Android' signature" would have been set by the client

    • by ackthpt ( 218170 ) on Thursday July 05, 2012 @06:23PM (#40558467) Homepage Journal

      and he doesn't realise that any program on any computer on the internet could pretend to be on android? I don't know much about mail but I would guess the"'Sent from Yahoo! Mail on Android' signature" would have been set by the client

      Engineer perhaps doesn't mean so much at Microsoft.

      Posted from my AndBot

      • Re: (Score:1, Insightful)

        by Anonymous Coward

        And you are a blathering idiot if you actually believe MS engineers are not some of the best software engineers in the world. You can go after MS for a whole host of shit but their engineers in their development and R&D entities are hardly stupid. The competition to recruit these people is intense and constant. Google in particular are constantly on the prow to snag engineers of this caliber. The vast majority of MS security and other issues can be placed at the feet of incompetent application developer

        • And who is it that created the dev system used by these "incompetent" "programmers"? 90% of .NET code that actually executes on computers belongs to MS and "programmers" just sort of fill in the blanks. Not to mention that MS still allows an App to reinstall major OS libraries as part of their runtime installation (e.g. replacing the critical MSVCRT*.DLL libraries sometimes with one two years older than was installed because the developer is using the old version of the DevSoftware because they can't aff

        • by e3m4n ( 947977 )

          Most programmers I know always ask themselves.. "how can I abuse or misuse this?" in order to try to guard against it. Who would you blame for the MS dumb-as-fuck decision to allow embedded code in JPEG to allow unattended execution of binaries with the same privilege level of the user only intending to view a picture?? Who would you blame for the decision to allow remote execution of binaries feature stuck into notepad?? Its a friggen text viewer, it should NOT be executing code without user consent. This

        • by mcgrew ( 92797 ) *

          And you are a blathering idiot if you actually believe MS engineers are not some of the best software engineers in the world.

          And you're not paying attention if you do. BSODs? Linux never had one. Random crashes? I don't know of Apple suffering from this, but Explorer crashes at least once a week on my Win 7 notebook.

          Sorry, fool, try out another OS and you'll see just how damned bad MS "engineers" are.

    • by Anonymous Coward

      One wonders how he even really knows they were sent from Yahoo accounts. Maybe that was spoofed too?

      Sent from my Eniac I

    • by Megor1 ( 621918 ) on Thursday July 05, 2012 @06:33PM (#40558537) Homepage
      He is a Program manager so, great journalism zdnet
    • by MrDoh! ( 71235 ) on Thursday July 05, 2012 @06:34PM (#40558547) Homepage Journal
      I believe him.
      Sent from my Cray Supercomputer. BillGates@Microsoft.com
    • by DragonWriter ( 970822 ) on Thursday July 05, 2012 @06:51PM (#40558695)

      A Microsoft engineer? and he doesn't realise that any program on any computer on the internet could pretend to be on android?

      Well, either "doesn't realise" or "has a vested interest leading him to first fail to mention and, after that, downplay the possibility". Which is more likely is left as an exercise to the reader.

    • Re: (Score:1, Interesting)

      by Anonymous Coward

      That was largely my thought, Android devices lack the processing power and access to bandwidth that your average laptop or desktop has. While I'm sure it's technically possible to have an Android spam botnet, it really begs the question as to why anybody would bother to develop such a thing. Considering how unreliable the connects are and how little you can transmit combined with the increased difficulty of getting the code to run, it doesn't seem like something that would be profitable enough to justify ma

  • by Anonymous Coward

    Is there any reason that Google's explanation isn't legit? Seems like a perfectly good explanation to me. Anti-spam techniques have become pretty abstract these days. I could easily see a hidden rule that prioritizes traffic sent with a properly formatted signature matching their flagship mobile OS (until said rule gets discovered).

  • by ignavus ( 213578 ) on Thursday July 05, 2012 @06:25PM (#40558481)

    What ? Spam lying?!?

    I am shocked. SHOCKED, I tell you!.

    • Nothing ruins the experience like a few crapware downloads.
    • The sad part (Score:4, Informative)

      by dubl-u ( 51156 ) * <<ot.atop> <ta> <2107893252>> on Thursday July 05, 2012 @09:36PM (#40559647)

      The really sad part is how far Microsoft has fallen. They can't even do FUD well anymore.

      • Microsoft has never really been very good at FUD either. The only thing they really excel at is protecting their monopoly by illegal means while paying only modest fines for the privilege.

        • yeah, how's that monopoly going?

          i look around my office... at a glance, maybe 30% mac?

          • Microsoft still exercises monpoly control over PC OEMs. A rather big segment of the technology market, still growing in fact. But the margins are shrinking.

          • by mcgrew ( 92797 ) *

            You're in music and design? In the 3 story building I work in there's a mainframe (unsure as to who built it, they had an IBM a decade ago), a whole lot of Windows computers, and no Macs at all. When you have to deploy thousands of PCs, you just don't go out and buy the most expensive ones on the market on a whim.

            Your office is not the average office.

  • Why not? (Score:5, Interesting)

    by rabtech ( 223758 ) on Thursday July 05, 2012 @06:30PM (#40558513) Homepage

    This seems like a much easier way to send spam... Most users will be using the stock mail app so just install, ask for the world in privileges (most users just click yes to anything), then send spam in the background using the user's account.

    If you are smart, you avoid sending any spam to that user's contacts and intercept any replies that contain the spam text as a quoted string. That would make it far less likely for the victim to notice anytime soon.

    Even if the spam isn't coming from Android phones right now, I'm sure someone will do it eventually.

    • Re:Why not? (Score:5, Informative)

      by AmberBlackCat ( 829689 ) on Thursday July 05, 2012 @06:34PM (#40558545)

      (most users just click yes to anything)

      On Android, you have to. Your only options are accept everything or you don't get the app.

      • Re:Why not? (Score:4, Informative)

        by Anonymous Coward on Thursday July 05, 2012 @06:47PM (#40558663)

        I've posted this before, but here we go again. There are quite a few options for fine-grained permission control on Android. My top 3:

        1) Cyanogenmod includes permission management. You'll have to flash it on your device, but it's not hard. http://www.cyanogenmod.com/
        2) PDroid - requires a patched kernel http://www.xda-developers.com/android/pdroid-the-better-privacy-protection/
        3) LBE Privacy guard - requires root https://play.google.com/store/apps/details?id=com.lbe.security.lite

        • Re:Why not? (Score:5, Informative)

          by Anonymous Coward on Thursday July 05, 2012 @08:35PM (#40559323)

          To be clear, Cyanogenmod 7 contains permission management. This feature was dropped in Cyanogenmod 9.

        • Re: (Score:3, Insightful)

          by CoderJoe ( 97563 ) *

          Now try again, without requiring flashing a custom OS version or root. The average user is not going to do any of that.

          • by Sir_Sri ( 199544 )

            Sad but true.

            Cyanogenmod has it's awesomeness, but when you have to get nightly builds to be able to run ICS without a slew of bugs there's a whole lot wrong with the user experience. And that by the way is not a criticism of the cyanogen guys, without them my phone would still be on 2.3.3 probably, or bug riddled official version of ICS but the main feature of android (not a walled garden!) is far too difficult to benefit from.

        • And 99.99 percent of Android users have never heard of any of those. Let us know when an out-of-the-box Android phone supports it (and an app bothers to implement it).
      • Sounds a lot like applications Microsoft creates...

      • On iPhone your only option is ...well you don't get to see the rights the app needs and so you don't know and aren't asked, you just have to trust Apple ...

        • On iPhone your only option is ...well you don't get to see the rights the app needs

          You actually have this totally reversed.

          On an iPhone app, you are asked for rights to access protected resources ONLY at the time the app tries to use them, not in some laundry list before you ever run the app and know what it needs.

          Currently the address book is not a protected resource but it is in iOS6, and then it will feature the same sensible security measure of asking for permission at time of first access as opposed t

  • Avoiding lawsuits (Score:4, Insightful)

    by gmuslera ( 3436 ) on Thursday July 05, 2012 @06:32PM (#40558529) Homepage Journal
    Microsoft was a monopoly in botnets, better to claim that are others somewhere else, even if they have to build it themselves.

    Anyway, a botnet uses a standard mail client to send its payload? Even thinking that is a bad signal about them.

  • by John3 ( 85454 ) <`john3' `at' `cornells.com'> on Thursday July 05, 2012 @06:32PM (#40558531) Homepage Journal

    There is a follow-up blog post [msdn.com] where Zink backtracks a bit and admits the headers could be forged.

    "In comments of various blogs a lot of people have suggested that these headers are spoofed, or there was a botnet connecting to Yahoo Mail from a Windows PC and sent mail that way. Yes, it’s entirely possible that bot on a compromised PC connected to Yahoo Mail, inserted the the message-ID thus overriding Yahoo’s own Message-IDs and added the “Yahoo Mail for Android” tagline at the bottom of the message all in an elaborate deception to make it look like the spam was coming from Android devices."

  • If anyone knows how to get down and dirty with Google, it will be Microsoft.
    • Re: (Score:2, Insightful)

      by Anonymous Coward
      And if anyone knows how to create scenarios to ensure that Google doesn't look bad, it will be Slashdot.
  • by NotSanguine ( 1917456 ) on Thursday July 05, 2012 @06:45PM (#40558639) Journal

    Or to disprove the claim if we can look at the mail headers. Especially if we have multiple samples.

    The claim, on its face, is plausible. However if you're a spammer, you want to send out as many emails as quickly as you can. Sending emails via a wireless device (either WiFi or cellular) seems like wasted effort when there are so many cable/dsl/fiber connected PCs (running whatever OS, but usually Windows) out there that can send many more spam emails in the same amount of time -- Usually without alerting non-technical users who don't review their router/firewall logs often, if ever.

    All that said, I suppose it's possible. It just seems a little strange that this should come out of Microsoft -- especially since there are many very technical people out there who are rolling their own Android -- you'd think they'd have found it first.

  • A Microsoft engineer says that Google's Android is to blame for spam.

    That carries as much weight for me as Steve BLAMMER stating that he's going to &^%&$!! bury Google.

    Noise with no real content. Next.

  • by Anonymous Coward on Thursday July 05, 2012 @06:57PM (#40558755)

    And if so does it match the generation scheme used by Android.

    If it's a repeating "Message-ID: " as the blog suggests then it's likely forged.

  • by ad454 ( 325846 ) on Thursday July 05, 2012 @06:58PM (#40558761) Journal

    Are you a skilled Android, iOS, OSX, or Linux malware author, and enjoy damp north-west coastal weather? Well, get out of your parent's basement and apply now to work in a large office with other similarly minded psychotic co-workers. The borg collective needs you, in order to stop its sliding market share! (After all, you can only get so far with frivolous lawsuits.)

    • Re: (Score:3, Interesting)

      by Anonymous Coward

      FWIW, I see far more frivolous lawsuits from Apple these days than from Microsoft. In fact, when was the last time we talked about a Microsoft lawsuit?

    • As someone that lives in the North-West, I feel then need to correct you about our weather. it is not damp as many non north-western dwellers would lead you to believe. It is in fact soaking fucking wet. "Damp" is the grass on a hot day up here!
  • Is it just Yahoo? (Score:5, Interesting)

    by whoever57 ( 658626 ) on Thursday July 05, 2012 @07:07PM (#40558821) Journal

    I see emails from compromised accounts. The one thing that appears to be common is that it is always from Yahoo accounts. After one of my friends had her Yahoo account compromised, I throughly scanned her PC -- nothing showed up. I scanned the hard drive while connected to a known clean PC, so it wasn't just a well hidden malware.

    I am beginning to wonder if there is a vulnerability in Yahoo's security that is being used to compromise accounts.

    • by kesuki ( 321456 ) on Thursday July 05, 2012 @07:28PM (#40558965) Journal

      nothing shows up because it's not on her pc, i've had spam coming from a former online friend, and more recently spam claiming to come from my own yahoo address.it turns out if you manually set the x-apparently-from yahoo will show that as the sender. yahoo explains it better here http://answers.yahoo.com/question/index?qid=20100725063846AAoDV1T [yahoo.com]

      • Re:Is it just Yahoo? (Score:5, Interesting)

        by whoever57 ( 658626 ) on Thursday July 05, 2012 @07:58PM (#40559137) Journal

        nothing shows up because it's not on her pc,

        Her account had to be compromised somehow. The emails were sent using her credentials. Her Yahoo mailbox was modified to delete all the saved emails and contacts, change the password and forward the email elsewhere. It was not simply someone sending email that looked like it came from her account -- it really was sent using her Yahoo account.

        She told me that she only checks her email from her PC, at home. She doesn't use open-Wifi points, she doesn't use other PCs. Unless there was some kind of malware the vaporized itself from her PC after stealing her account credentials, or [contrary to what she told me] she really did use another PC to check here email the limited evidence suggest that her account credentials were stolen by a security flaw at Yahoo.

        • Re:Is it just Yahoo? (Score:5, Interesting)

          by Billly Gates ( 198444 ) on Thursday July 05, 2012 @08:30PM (#40559295) Journal

          The answer is a Firefox exploit with an invisible iFrame. I have seen it myself and Hairyfeet noticed the same thing if you browse some porn sites with Firefox after you log in your account will randomly start spamming people.

          Basically it is an iframe rogue ad which looks identical to the yahoo email login and it uses javascript to place it over the real yahoo login from yahoo.com. Since the iframe is invisible in Firefox you have no clue and just click on it and give in the username and password.

          I wonder if Mozilla fixed this?

          • You log into yahoo from porn sites? Next time try opening a new tab and typing in "yahoo.com" or just using your bookmark.
          • It's just a funny visual that Joe Sxpack is browsing some fine gash on farms3x.com and sees a convenient link to yahoo and just decides to log into it without a care in the world.

            I'm easily amused.
    • How many of these yahoo accounts were the contact address for a LinkedIn account and used the same password?

      • How many of these yahoo accounts were the contact address for a LinkedIn account and used the same password?

        One of the people to whom this happened has suffered repeated break-ins to her Yahoo account. After the first compromise, I stressed the importance of not only having a strong password, but making sure that her password was not used elsewhere. So the suggestion that the cause was password re-use fails in at least one case. Also, I am fairly sure that she does not have a LinkedIn account.

    • by pgn674 ( 995941 )

      Possibly. To add to your anecdote, a couple months ago my old Yahoo! account got cracked, and I figured it was because I had left a weak password on there (fairly susceptible to a dictionary attack with some variance). So I changed to a stronger password and enabled two factor authentication. Then last week my coworker also got cracked, and she reported that she had a weak password.

      Maybe someone got a copy of a Yahoo! hashed password and user name table that they can work against with a computer cluster, or

  • We wouldn't let the facts interfere with our theory, would we?

  • by Anonymous Coward on Thursday July 05, 2012 @07:25PM (#40558947)

    For roughly the last week I've been using the string from the summary as essentially perfect proof that a message delivery attempt to my server is spam. The fact that Yahoo delivers almost no legitimate mail eases my worries. How the messages are actually originating is irrelevant to me, but bloody Hell there are a lot of 'em.

    Every three or four weeks the spammers seem to come up with a new template for the Yahoo spam they send and this is just the latest (actually, there seem to be a couple of huge spam operations running through Yahoo, not counting all the 419 scammers).

    Yahoo doesn't accept abuse complaints, and 10,000 Yahoo accounts are openly advertised as costing $137. It's hard to see how this is not a very serious problem that Yahoo should feel obligated to address.

    Here's roughly what a representative spam from this campaign looks like, slightly edited with mangled HTML so that Slashdot would display it:

    Return-Path:
    Received: from nm23-vm1.bullet.mail.bf1.yahoo.com (98.139.213.141) by
      myserver for spamvictim@mydomain>;
      Sun, 1 Jul 2012 12:55:08 -0700
    Received: from [98.139.212.145] by nm23.bullet.mail.bf1.yahoo.com with NNFMP; 01 Jul 2012 19:41:56 -0000
    Received: from [98.139.212.199] by tm2.bullet.mail.bf1.yahoo.com with NNFMP; 01 Jul 2012 19:41:56 -0000
    Received: from [127.0.0.1] by omp1008.mail.bf1.yahoo.com with NNFMP; 01 Jul 2012 19:41:56 -0000
    X-Yahoo-Newman-Property: ymail-5
    X-Yahoo-Newman-Id: 31585.24743.bm@omp1008.mail.bf1.yahoo.com
    Received: (qmail 53658 invoked by uid 60001); 1 Jul 2012 19:41:55 -0000
    DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s1024; t=1341171715; bh=XCjzxBAl+aG8gtCEWjueAIJtqJl1qzpQf/Pvh1rDXMQ=; h=Received:X-Mailer:Message-ID:Date:From:Subject:To:MIME-Version:Content-Type; b=nilcBrxhBDZ0vkail/UfvoWOspyAWtrnB4QklyD6KWshJdxlXlynsFBMeRaBWQICEtqEITG+SmghLsJStFOWR+eb39JXx1a5tl6LV/CQc9yIIrdmdR8qsdY3bwaqXYp+OfxsePQCZ0C+AoeJDlmIk0m51VIB1io7Kk9P7iudDok=
    DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws;
        s=s1024; d=yahoo.com;
        h=Received:X-Mailer:Message-ID:Date:From:Subject:To:MIME-Version:Content-Type;
        b=cHirUEK+wuN6DGQSrgiWi6qqyGJFrSO9BVJaVwv664oJ+u1RLo95cHPuIDPutn5hMoTiBFi3zmvjmprGCAVlP3EQDzWDQD6dG6tUO02acOYLJJ3WM9MKCqUKAb/nCAKaQ8xh/bzU1/zC/nQP9WZRidccQUSNChY6+bAhx3tol3E=;
    Received: from [190.201.200.221] by web140206.mail.bf1.yahoo.com via HTTP; Sun, 01 Jul 2012 12:41:55 PDT
    X-Mailer: YahooMailWebService/0.8.120.356233
    Message-ID: ##########.##### .androidMobile@web140206.mail.bf1.yahoo.com>
    Date: Sun, 1 Jul 2012 12:41:55 -0700 (PDT)
    From: Desiree Chinnici DesireeChinnicifo64@yahoo.com>
    Subject: FWD: 300% Gain!
    To: "noncale@simon.com" noncale@simon.com>
    MIME-Version: 1.0
    Content-Type: multipart/alternative; boundary="--nottherealboundarymarker=:blargh--"

    --nottherealboundarymarker=:blargh--
    Content-Type: text/plain; charset=us-ascii

    Please Enable Images to View this Important Newsletter!

    img src="https://public.blu.livefilestore.com/longuniqueidentifier/13.gif?psid=1"/a>

    Sent from Yahoo! Mail on Android

    --nottherealboundarymarker=:blargh--
    Content-Type: text/html; charset=us-ascii

    table cellspacing="0" cellpadding="0" border="0">tr>td valign="top" style="font: inherit;">p>/p>
    p>Please Enable Images to View this Important Newsletter!

    br>
    img src="https://public.blu.livefilestore.com/longuniqueidentifier/13.gif?psid=1"/a>br>br>br>/p>
    p>Sent from Yahoo! Mail on Android/p> /td>/tr>
    --nottherealboundarymarker=:blargh--

  • This doesnt start off sounding fishyatall “a mircosoft reasearcher” no MS has nothing to gain bymaking android look bad. And then this gem “Security expertGraham Cluley, from anti-virusfirm Sophos, said it was highlylikely theattacks originated from Android devices, given all available information, BUT THIS COULD NOT BE PROVEN.” Wait whatit hasnt been proven to come from android phones? REALLY? And then we learn even it it is happening its people in the third world SIDE LOADING PIRAT
  • I'm not interested in programming myself, but I've always pondered the possibility of blocking certain android permissions with an app.

    There is an app called permission denied that will allow you to do this, but it doesn't do so gracefully. When a targeted app does something to utilize the permissions it already assumes the OS has given it, it will typically crash when it can't execute that function due to lack of a try/catch, because the developer normally wouldn't expect to need one there.

    So instead of ou

  • MS should understand and tolerate it. After all they always claimed that DOS/Windows wasn't more insecure than other OS but was simply targeted more often because they had the largest installed base.

    Smug bastards and now apparently truly blithering idiots I say.
  • by Anonymous Coward

    1. First: the example " by CO1EHSMHS003.bigfish.com (10.243.66.13) with Microsoft SMTP Server id 14.1.225.23; Sat, 30 Jun 2012 23:22:47 +0000" points to an "Host 0.66.243.10.in-addr.arpa. not found: 3(NXDOMAIN)".
    2. Second: the example "Received: from [redacted]" ?!?! "via HTTP" doesn't point to a particular email sender source.
    3. Third: no two different messages must ever have the same Message-ID. The message identifier (msg-id) itself MUST be a globally unique
    identifier for a message

  • Android is Linux, so it can't get any virii or malware. So, it looks as if Google is indeed correct in their theory that it must be Windows-based virii which are just faking an Android signature.
  • There's no way that an Android botnet exists. Google's "Don't Be Evil" edict ensures that will never occur....

Understanding is always the understanding of a smaller problem in relation to a bigger problem. -- P.D. Ouspensky

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