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Groups > comp.lang.javascript > #32902

Re: This is a VIRUS - how does it works?

From Stefan Weiss <krewecherl@gmail.com>
Newsgroups comp.lang.javascript
Subject Re: This is a VIRUS - how does it works?
Date 2017-04-02 01:07 +0200
Organization albasani.net
Message-ID <obpbrk$d0i$1@news.albasani.net> (permalink)
References <qtupdcda9p594dvj6aos78nhg4kp2b493f@4ax.com>

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tom wrote:
> the body of the email invited me to open and read the attachment,
> I extracted on the Desktop folder the .jse file
> and I double-clicked the .jse file
> on my Windows 10 64 bit 
...
> QUESTION:
> 
> is there anybody who is able to understand what it does
> (and therefore what should have I delete more from my Windows 10 64
> bit...)?

The code you posted is not a virus itself. It only serves as a vehicle to
download the actual payload, which is a Windows executable file.

The JS code has been heavily obfuscated to mask what it does, but this
process can be reversed (up to a point). In your case, it will download a
file named bbb.png from a (presumably compromised) Italian website, store it
on your computer as an .exe file and run it. My curiosity ended there, I
didn't try to find out what exactly this program does.

There is an entry on VirusTotal for the bbb.png file:
<https://www.virustotal.com/en/file/f5fc3d694ce407203bd1471c75a02f12ddf88cd124fd8e05dad79956209fd650/analysis/>

It's recognized as malicious by 6 out of 61 engines. By itself, that doesn't
say much, but the way in which this file was delivered to you makes it
pretty obvious.
Relevant for you: Avast did NOT detect the malware.
(Spyhunter is not an antivirus engine, and is not included in the list. From
what I've now read about it, you should probably get rid of it.)

That's all I can say at this point. Standard procedure after a compromise is
to wipe the system, reinstall, and restore user data from know-good backups.
I assume the lesson about not executing random email attachments has been
learned.


- stefan


PS, if there is any interest in the de-obfuscated code, let me know.

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Thread

This is a VIRUS - how does it works? tom <tom@inwind.it> - 2017-03-30 14:37 +0200
  Re: This is a VIRUS - how does it works? tom <tom@inwind.it> - 2017-03-30 14:43 +0200
    Re: This is a VIRUS - how does it works? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-03-30 18:32 +0200
  Re: This is a VIRUS - how does it works? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-03-30 18:31 +0200
    Re: This is a VIRUS - how does it works? tom <tom@inwind.it> - 2017-03-30 21:22 +0200
      Re: This is a VIRUS - how does it works? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-03-30 23:20 +0200
        Re: This is a VIRUS - how does it works? tom <tom@inwind.it> - 2017-03-31 14:00 +0200
          Re: This is a VIRUS - how does it works? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-03-31 17:26 +0200
            Re: This is a VIRUS - how does it works? tom <tom@inwind.it> - 2017-04-01 22:00 +0200
              Re: This is a VIRUS - how does it works? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-04-01 22:11 +0200
                Re: This is a VIRUS - how does it works? tom <tom@inwind.it> - 2017-04-02 21:02 +0200
                Re: This is a VIRUS - how does it works? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-04-02 22:50 +0200
                Re: This is a VIRUS - how does it works? a <a@inwind.it> - 2017-04-03 23:18 +0200
                Re: This is a VIRUS - how does it works? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-04-03 23:22 +0200
                Re: This is a VIRUS - how does it works? Tim Streater <timstreater@greenbee.net> - 2017-04-03 22:41 +0100
                Re: This is a VIRUS - how does it works? tom <tom@inwind.it> - 2017-04-04 00:58 +0200
                Re: This is a VIRUS - how does it works? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-04-04 09:31 +0200
                Re: This is a VIRUS - how does it works? Flippie Flink <flip@flink.not> - 2017-04-04 12:09 +0200
                Re: This is a VIRUS - how does it works? tom <tom@inwind.it> - 2017-04-04 00:50 +0200
      Re: This is a VIRUS - how does it works? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-03-31 00:51 +0200
        Re: This is a VIRUS - how does it works? tom <tom@inwind.it> - 2017-03-31 14:05 +0200
          Re: This is a VIRUS - how does it works? Wally W. <ww84wa@aim.com> - 2017-03-31 11:54 -0400
            Re: This is a VIRUS - how does it works? tom <tom@inwind.it> - 2017-04-01 21:56 +0200
  Re: This is a VIRUS - how does it works? Stefan Weiss <krewecherl@gmail.com> - 2017-04-02 01:07 +0200
    Re: This is a VIRUS - how does it works? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-04-02 14:31 +0200
      Re: This is a VIRUS - how does it works? Stefan Weiss <krewecherl@gmail.com> - 2017-04-02 15:07 +0200
        Re: This is a VIRUS - how does it works? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-04-14 22:10 +0200
    Re: This is a VIRUS - how does it works? tom <tom@inwind.it> - 2017-04-02 21:45 +0200
      Re: This is a VIRUS - how does it works? Stefan Weiss <krewecherl@gmail.com> - 2017-04-03 03:03 +0200
        Re: This is a VIRUS - how does it works? a <a@inwind.it> - 2017-04-04 00:45 +0200
          Re: This is a VIRUS - how does it works? tom <tom@inwind.it> - 2017-04-04 00:50 +0200
          Re: This is a VIRUS - how does it works? Stefan Weiss <krewecherl@gmail.com> - 2017-04-04 02:51 +0200
            Re: This is a VIRUS - how does it works? tom <tom@inwind.it> - 2017-04-06 23:54 +0200
              Re: This is a VIRUS - how does it works? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-04-07 09:03 +0200
                Re: This is a VIRUS - how does it works? tom <tom@inwind.it> - 2017-04-07 23:05 +0200
                Re: This is a VIRUS - how does it works? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-04-07 23:48 +0200
                Re: This is a VIRUS - how does it works? tom <tom@inwind.it> - 2017-04-08 14:09 +0200
                Re: This is a VIRUS - how does it works? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-04-08 14:32 +0200
  Re: This is a VIRUS - how does it works? "Chris M. Thomasson" <invalid@invalid.invalid> - 2017-04-03 14:31 -0700
    Re: This is a VIRUS - how does it works? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-04-03 23:34 +0200
      Re: This is a VIRUS - how does it works? Andrew Poulos <ap_prog@hotmail.com> - 2017-04-04 11:35 +1000
        Re: This is a VIRUS - how does it works? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-04-04 09:36 +0200
    Re: This is a VIRUS - how does it works? tom <tom@inwind.it> - 2017-04-04 00:59 +0200
      Re: This is a VIRUS - how does it works? "Chris M. Thomasson" <invalid@invalid.invalid> - 2017-04-03 16:08 -0700
        Re: This is a VIRUS - how does it works? "Chris M. Thomasson" <invalid@invalid.invalid> - 2017-04-03 16:17 -0700
        Re: This is a VIRUS - how does it works? "Chris M. Thomasson" <invalid@invalid.invalid> - 2017-04-05 13:58 -0700
      Re: This is a VIRUS - how does it works? "Chris M. Thomasson" <invalid@invalid.invalid> - 2017-04-19 12:59 -0700
        Re: This is a VIRUS - how does it works? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-04-20 00:13 +0200
          Re: This is a VIRUS - how does it works? "Chris M. Thomasson" <invalid@invalid.invalid> - 2017-04-19 16:59 -0700
            Re: This is a VIRUS - how does it works? "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-04-20 08:49 +0200
              Re: This is a VIRUS - how does it works? "Chris M. Thomasson" <invalid@invalid.invalid> - 2017-05-01 13:40 -0700
  Re: This is a VIRUS - how does it works? tom <tom@inwind.it> - 2017-04-12 14:06 +0200
    Re: This is a VIRUS - how does it works? <cyber@2trom.com> - 2017-04-12 13:59 +0000
      Re: This is a VIRUS - how does it works? tom <tom@inwind.it> - 2017-04-12 22:23 +0200
        Re: This is a VIRUS - how does it works? tom <tom@inwind.it> - 2017-04-12 22:28 +0200
        Re: This is a VIRUS - how does it works? <cyber@2trom.com> - 2017-04-12 21:55 +0000
        Re: This is a VIRUS - how does it works? "Michael Haufe (TNO)" <tno@thenewobjective.com> - 2017-04-14 12:34 -0700
          Re: This is a VIRUS - how does it works? tom <tom@inwind.it> - 2017-04-14 22:42 +0200

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