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Re: Aumlib malware
From: Nick Randolph <drandolph () sourcefire com>
Date: Mon, 12 Aug 2013 11:47:17 -0400

I think we should add in the MSIE 5 user-agent as a fast_pattern:only and
maybe blacklist DNS rules for the domains in use. I grabbed the samples and
gave them a really quick look.

832f5e01be536da71d5b3f7e41938cfb
That user-agent used in the POST to /bbs/search.asp and
/buy-sell/search.asp?newsid= is static in the malware.
   Mozilla/4.0 (compatible; MSIE 5.0; Windows NT 5.0)
The domains are also static
   info.xxuz.com and warnews.toh.info

cb3dcde34fd9ff0e19381d99b02f9692
Also uses static domains
   documents.myPicture.info
   ftp.documents.myPicture.info
   www.documents.myPicture.info

The URL changes slightly but the user-agent isn't as obvious in the binary.
Since it's still reporting MSIE 5.0 then it's probably still static
  /bbs/info.asp

aa873ed803ca800ce92a39d9a683c644
This one is a word doc and looks like it gets picked up with sid:26832


On Mon, Aug 12, 2013 at 11:40 AM, Ned Moran <ned () mysterymachine info> wrote:

 sample in question (832f5e01be536da71d5b3f7e41938cfb) can be found on VT.


https://www.virustotal.com/en/file/c77afbe515536773777afebf500088e5b61cf23a6f527e6e39c0895e7be223c7/analysis/

-Ned


On 8/12/13 11:16 AM, Y M wrote:

Tried to get a sample of the executable from the urls mentioned in the reference but wasn't able to. Need more 
testing:
alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Win.Backdoor.Aumlib GET request"; 
flow:to_server,established; content:"GET"; http_method; content:"/buy-sell/"; http_uri; content:"search.asp"; 
http_uri; metadata: impact_flag red, policy balanced-ips drop, policy security-ips drop, ruleset community, service 
http; reference:url, 
fireeye.com/blog/technical/2013/08/survival-of-the-fittest-new-york-times-attackers-evolve-quickly.html; 
classtype:trojan-activity; sid:100023; rev:1;)
alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Win.Backdoor.Aumlib POST request"; 
flow:to_server,established; content:"POST"; http_method; content:"/bbs/"; http_uri; content:"search.asp"; nocase; 
http_uri; metadata: impact_flag red, policy balanced-ips drop, policy security-ips drop, ruleset community, service 
http; reference:url, 
fireeye.com/blog/technical/2013/08/survival-of-the-fittest-new-york-times-attackers-evolve-quickly.html; 
classtype:trojan-activity; sid:100022; rev:1;)
Thanks.YM                                     



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-- 

Nick Randolph
Research Engineer
Sourcefire, Inc.
nrandolph () sourcefire com
Sourcefire.com <http://www.sourcefire.com/>
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