[Emerging-Sigs] ET MALWARE Zero Content-Length HTTP POST withdata (outbound)

Matthew Jonkman jonkman at emergingthreatspro.com
Wed Oct 27 16:56:33 EDT 2010

Good idea, but it looks like that'll just eliminate a subset of the false positives, no?

Are there a few things we could look for that are common to the false positives everyone's seeing?


On Oct 27, 2010, at 11:47 AM, Josh Little wrote:

> On 10/27/2010 11:23 AM, Weir, Jason wrote:
>> I'm seeing a few of these on what seems to be legit traffic as well. 
>> If someone wants the pcaps let me know.
>> -J
> We were seeing several thousand of these as well, to the point where I
> finally had to turn the sig off. Many were keep-alive-esqe requests or
> AJAX requests. A lot were from a set of internal CMS tools, so I won't
> be able to send on any PCAPS or raw HTTP. I wonder if the sig could be
> modified to check to see if the X-Requested-With: XMLHttpRequest header
> is not set?
> ZT
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Matthew Jonkman
Emerging Threats Pro
Open Information Security Foundation (OISF)
Phone 765-807-8630
Fax 312-264-0205

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