Re: Quick Android/Fakelash.A!tr.spy sig

[Joel Esler <jesler () sourcefire com>]

James,

It looks like the sections you wrote your sig off of are the text message and the phone number from the phone being 
sent, this would change every time.  So given the information I have I wrote the following:

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Android/Fakelash.A!tr.spy trojan command and 
control channel traffic"; flow:to_server,established; content:"/data.php?action="; http_uri; nocase; content:"&m="; 
nocase; http_uri; distance:0; content:"&p="; http_uri; nocase; distance:0; content:"&n="; http_uri; nocase; distance:0; 
metadata:policy security-ips drop, service http; 
reference:url,http://blog.fortiguard.com/android-malware-distributed-by-malicious-sms-in-france/; 
classtype:trojan-activity;)


Please let me know how that works out.

--
Joel Esler
Senior Research Engineer, VRT
OpenSource Community Manager
Sourcefire

On Sep 21, 2012, at 5:14 PM, James Lay <jlay () slave-tothe-box net> wrote:

> Maybe add the /data.php?action=add?  Not sure...sanity checked, but not 
> much more as I don't have pcaps.
>
> alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC 
> Android/Fakelash.A!tr.spy trojan command and control channel traffic"; 
> flow:to_server,established; content:"=hithere"; content:"=1234"; 
> fast_pattern:only; http_uri; metadata:policy security-ips drop, service 
> http; 
> reference:url,http://blog.fortiguard.com/android-malware-distributed-by-malicious-sms-in-france/; 
> classtype:trojan-activity; sid:10000028; rev:1;)
>
> As always, comments and improvements welcome.  Thanks all!
>
> James
>
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