[Snort-sigs] New bleeding sigs

Matthew Jonkman matt at ...2436...
Tue Jul 6 14:21:06 EDT 2004


Joel Esler has submitted a number of gems. These are all invaluable for 
finding covert activity. The IRC ones in particular have helped us out 
today catching a new trojan.

These are all up on bleeding. Thanks very much Joel. (And they're much 
easier to read up there instead of cut at 80 characters)

alert tcp any !22 -> any !22 (msg:"BLEEDING-EDGE Covert Non-Standard SSH 
Port Usage"; flags:AP+;content: "SSH-"; depth:8; sid:2000353; rev:1;)

alert tcp any any -> any !25 (msg:"BLEEDING-EDGE IRC - Nick change on 
non-std port"; content: "NICK "; offset:0; depth:5; nocase; dsize:<64; 
flow:to_server,established; tag:session,300,seconds; 
classtype:policy-violation; sid:2000344; rev:1;)
alert tcp $HOME_NET any -> $EXTERNAL_NET !25 (msg:"BLEEDING-EDGE IRC - 
Nick change on non-std port"; content:"NICK "; offset:0; depth:5; 
nocase; dsize:<64; flow:to_server,established; tag:session,3600,seconds; 
classtype:trojan-activity; sid:2000345; rev:1;)
alert tcp $EXTERNAL_NET any -> $HOME_NET !25 (msg:"BLEEDING-EDGE IRC - 
Name response on non-std port"; content:"\:"; offset:0; depth:1; 
content:" 302 "; content:"=+"; content:"@"; dsize:<128; 
flow:to_client,established; tag:session,3600,seconds; 
classtype:trojan-activity; sid:2000346;)
alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"BLEEDING-EDGE IRC - 
Private message on non-std port"; content:"PRIVMSG "; nocase; offset:0; 
depth:8; dsize:<128; flow:to_server,established; 
tag:session,3600,seconds; classtype:trojan-activity; sid:2000347; rev:1;)
alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"BLEEDING-EDGE IRC - 
Channel JOIN on non-std port"; content:"JOIN "; offset:0; depth:5; 
nocase; pcre:"/&|#|\+|!/R"; dsize:<64; flow:to_server,established; 
tag:session,3600,seconds; classtype:trojan-activity; sid:2000348; rev:1;)
alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"BLEEDING-EDGE IRC - 
DCC file transfer request on non-std port"; flow:to_server,established; 
content:"PRIVMSG "; nocase; offset:0; depth:8; content:" \:.DCC SEND"; 
nocase; tag:session,3600,seconds; classtype:policy-violation; 
sid:2000349; rev:1;)
alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"BLEEDING-EDGE IRC - 
DCC chat request on non-std port"; flow:to_server,established; 
content:"PRIVMSG "; nocase; offset:0; depth:8; content:" \:.DCC CHAT 
chat"; nocase; tag:session,3600,seconds; classtype:policy-violation; 
sid:2000350; rev:1;)
alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"BLEEDING-EDGE IRC - 
channel join on non-std port"; flow:to_server,established; content:"JOIN 
\: \#"
; nocase; offset:0; depth:8; tag:session,3600,seconds; 
classtype:policy-violation; sid:2000351; rev:1;)
alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"BLEEDING-EDGE IRC - 
dns request on non-std port"; flow:to_server,established; 
content:"USERHOST "; nocase; offset:0; depth:9; 
tag:session,3600,seconds; classtype:policy-violation; sid:2000352; rev:1;)

-- 
--------------------------------------------
Matthew Jonkman, CISSP
Senior Security Engineer
Infotex
765-429-0398 Direct Anytime
765-448-6847 Office
866-679-5177 24x7 NOC
my.infotex.com
www.offsitefilter.com
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