full-disclosure - Malicious Code Analysis

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Message-ID: <200508050903.j7593hex078695@mailserver3.hushmail.com>
Date: Fri Aug  5 10:03:53 2005
From: ngiles at hushmail.com (mike king)
Subject: Malicious Code Analysis

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Peter,

Hello back. Hey thanks for the reply and not a flame.

These were not submitted to any AV vendors since Norton did flag
them. In the past I have submitted unknown trojans/ viruses like
these to Symantec when clients have been owned, but what can I say
they are hardly 0day more like 300 day.

The programs that were used when first found were “Hex Workshop”
and “IDA”. The other way they were confirmed was with the packer
used to compress the file after the string seg000:00003ABD 0000000C
C \bPECompact2 was located. Cool thing with PECompact2 is it will
also tell you if it was packed with the tool.

Output:
Path: C: \wytgp.exe
This module is compressed by PECompact2.

http://www.bitsum.com/pec2.asp

Could you share your methodology on how you go about reverse
engineering/ disassembling a malicious piece of code that has had a
packer ran on it?

Regards
Mike.


On Thu, 04 Aug 2005 23:55:35 -0700 Peter Kruse <pkr@...s.dk> wrote:
>Hi Mike,
>
>I was just wondering if you have submitted these lastad samples to

>any
>antivirus vendors?
>
>Although this malware is already identified by several vendors,
>some don't
>detect any of these "lastad" variants posted on your website. A
>good way to
>ensure that samples gets added for detection, and to help others,
>would be
>submitting samples to your prefered av-vendor.
>
>Also you should not use a hex editor to determine the format of a
>binary,
>since headers are easily modified. Use disassemblers/debuggers
>like olly,
>softice or IDA.
>
>Regards
>Peter Kruse
>
>> -----Original Message-----
>> From: full-disclosure-bounces@...ts.grok.org.uk
>> [mailto:full-disclosure-bounces@...ts.grok.org.uk] On Behalf
>> Of mike king
>> Sent: 5. august 2005 02:40
>> To: full-disclosure@...ts.grok.org.uk; m4ch3t3@...il.com
>> Subject: Re: [Full-disclosure] Malicious Code Analysis
>>
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>> Hash: SHA1
>>
>> Here you go; I got this malware from a friend's machine that
>> had been infected. This was about 2 months ago so there
>> about. Use a hex editer to give you what it was packed with
>> and then just go from there. Good luck and have fun.
>>
>> download it from here http://209.200.126.28/sample.zip
>> "unzip" "rename the rar_ to .rar" "unrar".
>>
>>
>> If anyone is wondering yes antivirus picks it up so don't worry.
>>
>>
>> On Thu, 04 Aug 2005 15:19:14 -0700 M4ch3T3 Hax
><m4ch3t3@...il.com>
>> wrote:
>> >Hello all,
>> >
>> >I have recently graduated from a computers & networking course
>at
>> >university and have spent alot of my time analysing network
>security
>> >from a scanning/sniffing/hardening point of view.
>> >
>> >I'm now becoming very interested in learning more about
>> malicious code
>> >analysis in a virtual machine environment. I have read
>documentation
>> >and set up the environment and tools etc.. However I have no
>> malicious
>> >code to look at! does anyone know of a way to get hold of some?
>> >
>> >Also, if anyone can recommend any further reading or sites etc.

>It
>> >would be very much appreciated!
>> >
>> >Cheers!
>> >_______________________________________________
>> >Full-Disclosure - We believe in it.
>> >Charter: http://lists.grok.org.uk/full-disclosure-charter.html
>> >Hosted and sponsored by Secunia - http://secunia.com/
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>> _______________________________________________
>> Full-Disclosure - We believe in it.
>> Charter: http://lists.grok.org.uk/full-disclosure-charter.html
>> Hosted and sponsored by Secunia - http://secunia.com/
>>
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