Re: [Emerging-Sigs] Wirelurker A and B

[James Lay <jlay () slave-tothe-box net>]

On 2014-11-06 13:16, rmkml wrote:
> Thx James and James ;)
>
> Maybe add http_header please ?
>
> Regards
> @Rmkml
>
>
> On Thu, 6 Nov 2014, James Espinosa wrote:
>
> > Thanks, James! I believe there should be a space between the 
> > User-Agent|3A| and globalupdate (at least it appears that way in the 
> > report). Can I suggest the following as a fix?
> > alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS 
> > (msg:"MALWARE-CNC OSX.Trojan.Wirelurker.AB"; 
> > flow:to_server,established; content:"User-Agent|3A| globalupdate"; 
> > fast_pattern:only; metadata:impact_flag red, policy balanced-ips drop, 
> > policy security-ips
> > drop, service http; reference: 
> > url,researchcenter.paloaltonetworks.com/2014/11/wirelurker-new-era-os-x-ios-malware; 
> > classtype:trojan-activity; sid:10000138; rev:1;)
> > Thanks,
> > james espinosa
> > security researcher
> > 847.497.5237 @ jamesejr.com
> > On Thu, Nov 6, 2014 at 10:47 AM, James Lay 
> > <jlay () slave-tothe-box net> wrote:
> >       May help someone somewhere...a quick search of 
> > http://www.ua-tracker.com/ showed no known UA with globalupdate, so I 
> > figured I'd just look for that and be done with it.
> >
> >       alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS 
> > (msg:"MALWARE-CNC OSX.Trojan.Wirelurker.AB"; 
> > flow:to_server,established; content:"User-Agent|3A|globalupdate"; 
> > fast_pattern:only; metadata:impact_flag red, policy balanced-ips drop, 
> > policy
> >       security-ips drop, service http; reference: 
> > url,researchcenter.paloaltonetworks.com/2014/11/wirelurker-new-era-os-x-ios-malware; 
> > classtype:trojan-activity; sid:10000138; rev:1;)
> >
> >       Rev C uses encrypted channels, so uh...hope you don't get C.  
> > As always fixes are welcome.
> >
> >       James
> >       _______________________________________________
> >       Emerging-sigs mailing list
> >       Emerging-sigs () lists emergingthreats net
> >       
> > https://lists.emergingthreats.net/mailman/listinfo/emerging-sigs
> >
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> > http://www.emergingthreats.net

Heh...thanks James and @Rmkml...good catch to both:

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC 
OSX.Trojan.Wirelurker.AB"; flow:to_server,established; 
content:"User-Agent|3A| globalupdate"; http_header; fast_pattern:only; 
metadata:impact_flag red, policy balanced-ips drop, policy security-ips 
drop, service http; reference: 
url,researchcenter.paloaltonetworks.com/2014/11/wirelurker-new-era-os-x-ios-malware; 
classtype:trojan-activity; sid:10000138; rev:1;)

James

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