Yes, I saw those rules. While they should be fairly reliable, the DOS
stub that prints "This program cannot be run in DOS mode" is not
guarantied. A malware author can link in their own DOS stub that
includes whatever he or she wants. Also, some file-infecting malware
overwrites the DOS stub. So, I'd rather not rely on that string.
-----Original Message-----
From: Jeffrey Denton [mailto:dentonj@gmail.com]
Sent: Thursday, July 12, 2007 1:10 PM
To: Humes, David G.
Cc: snort-users@lists.sourceforge.net
Subject: Re: [Snort-users] Snort rule to detect Windows PE
Executable Downloads
On 7/12/07, Humes, David G. <David.Humes@jhuapl.edu> wrote:
I would like to have a Snort rule to reliably detect the
download of a
Windows PE executable file.
alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:
"BLEEDING-EDGE PE EXE or DLL Windows file download"; flow:
established; content:"MZ";
isdataat: 76,relative; content:"This program cannot be run in
DOS mode."; distance: 0; isdataat: 10,relative; content:"PE";
distance: 0;
classtype: misc-activity; sid: 2000419; rev:6; )
alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:
"BLEEDING-EDGE PE EXE Install Windows file download"; flow:
established; content:"MZ";
isdataat: 76,relative; content:"This program must be run under Win32";
distance: 0; isdataat: 140,relative; content:"PE"; distance:
0; reference:url,www.program-transformation.org/Transform/PcExeFormat;
classtype: misc-activity; sid: 2000427; rev:6; )
If you are running the Bleedingthreats rules, this signatures
are commented out by default.
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