alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET TROJAN Suspicious User-Agent Possible Trojan Downloader Shell"; flow:established,to_server; content:"Shell"; http_user_agent; depth:5; isdataat:!1,relative; nocase; metadata: former_category HUNTING; reference:url,doc.emergingthreats.net/2007840; reference:url,www.securelist.com/en/blog/434/The_Chinese_bootkit; classtype:trojan-activity; sid:2007840; rev:11; metadata:affected_product Any, attack_target Client_Endpoint, deployment Perimeter, tag User_Agent, tag Trojan_Downloader, signature_severity Major, created_at 2010_07_30, updated_at 2019_10_11;)

Added 2019-10-11 19:56:24 UTC

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET TROJAN Suspicious User-Agent Possible Trojan Downloader Shell"; flow:established,to_server; content:"User-Agent|3a| Shell|0d 0a|"; http_header; nocase; metadata: former_category HUNTING; reference:url,doc.emergingthreats.net/2007840; reference:url,www.securelist.com/en/blog/434/The_Chinese_bootkit; classtype:trojan-activity; sid:2007840; rev:10; metadata:affected_product Any, attack_target Client_Endpoint, deployment Perimeter, tag User_Agent, tag Trojan_Downloader, signature_severity Major, created_at 2010_07_30, updated_at 2017_10_30;)

Added 2019-10-09 19:08:40 UTC

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET USER_AGENTS Suspicious User-Agent Possible Trojan Downloader Shell"; flow:established,to_server; content:"User-Agent|3a| Shell|0d 0a|"; http_header; nocase; metadata: former_category TROJAN; reference:url,doc.emergingthreats.net/2007840; reference:url,www.securelist.com/en/blog/434/The_Chinese_bootkit; classtype:trojan-activity; sid:2007840; rev:10; metadata:affected_product Any, attack_target Client_Endpoint, deployment Perimeter, tag User_Agent, tag Trojan_Downloader, signature_severity Major, created_at 2010_07_30, updated_at 2017_10_30;)

Added 2017-10-30 18:17:28 UTC

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET USER_AGENTS Suspicious User-Agent Possible Trojan Downloader Shell"; flow:established,to_server; content:"User-Agent|3a| Shell|0d 0a|"; http_header; nocase; metadata: former_category TROJAN; reference:url,doc.emergingthreats.net/2007840; reference:url,www.securelist.com/en/blog/434/The_Chinese_bootkit; classtype:trojan-activity; sid:2007840; rev:10; metadata:affected_product Any, attack_target Client_Endpoint, deployment Perimeter, tag User_Agent, tag Trojan_Downloader, signature_severity Major, created_at 2010_07_30, updated_at 2017_10_30;)

Added 2017-10-30 16:39:37 UTC

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET TROJAN Suspicious User-Agent Possible Trojan Downloader Shell"; flow:established,to_server; content:"User-Agent|3a| Shell|0d 0a|"; http_header; nocase; reference:url,doc.emergingthreats.net/2007840; reference:url,www.securelist.com/en/blog/434/The_Chinese_bootkit; classtype:trojan-activity; sid:2007840; rev:9; metadata:affected_product Any, attack_target Client_Endpoint, deployment Perimeter, tag User_Agent, tag Trojan_Downloader, signature_severity Major, created_at 2010_07_30, updated_at 2016_07_01;)

Added 2017-08-07 21:01:04 UTC

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"ET TROJAN Suspicious User-Agent Possible Trojan Downloader Shell"; flow:established,to_server; content:"User-Agent|3a| Shell|0d 0a|"; http_header; nocase; reference:url,doc.emergingthreats.net/2007840; reference:url,www.securelist.com/en/blog/434/The_Chinese_bootkit; classtype:trojan-activity; sid:2007840; rev:7;)

Added 2012-03-02 14:29:00 UTC

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"ET TROJAN Suspicious User-Agent Possible Trojan Downloader Shell"; flow:established,to_server; content:"User-Agent|3a| Shell"; http_header; nocase; reference:url,doc.emergingthreats.net/2007840; reference:url,www.securelist.com/en/blog/434/The_Chinese_bootkit; classtype:trojan-activity; sid:2007840; rev:6;)

Added 2011-10-12 19:23:56 UTC

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"ET TROJAN Suspicious User-Agent Possible Trojan Downloader Shell"; flow:established,to_server; content:"User-Agent|3a| Shell"; http_header; nocase; classtype: trojan-activity; reference:url,doc.emergingthreats.net/2007840; reference:url,www.securelist.com/en/blog/434/The_Chinese_bootkit; sid:2007840; rev:6;)

Added 2011-09-14 22:37:24 UTC

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"ET TROJAN Suspicious User-Agent Possible Trojan Downloader Shell"; flow:established,to_server; content:"User-Agent|3a| Shell"; http_header; nocase; classtype: trojan-activity; reference:url,doc.emergingthreats.net/2007840; reference:url,www.emergingthreats.net/cgi-bin/cvsweb.cgi/sigs/VIRUS/TROJAN_Downloader_General; reference:url,www.securelist.com/en/blog/434/The_Chinese_bootkit; sid:2007840; rev:6;)

Added 2011-04-08 18:04:14 UTC

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"ET TROJAN Suspicious User-Agent - Possible Trojan Downloader (Shell)"; flow:established,to_server; content:"User-Agent|3a| Shell|0d 0a|"; http_header; nocase; classtype: trojan-activity; reference:url,doc.emergingthreats.net/2007840; reference:url,www.emergingthreats.net/cgi-bin/cvsweb.cgi/sigs/VIRUS/TROJAN_Downloader_General; sid:2007840; rev:4;)

Added 2011-02-04 17:26:56 UTC

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"ET TROJAN Suspicious User-Agent - Possible Trojan Downloader (Shell)"; flow:established,to_server; content:"|0d 0a|User-Agent\: Shell|0d 0a|"; nocase; classtype: trojan-activity; reference:url,doc.emergingthreats.net/2007840; reference:url,www.emergingthreats.net/cgi-bin/cvsweb.cgi/sigs/VIRUS/TROJAN_Downloader_General; sid:2007840; rev:2;)

Added 2009-02-12 18:21:15 UTC

This seems to be associated with something called "MSNShell", we are observing hits to the following domains "shell09.msnshell. com", "config.msnshell. com"

-- MikeWazowski - 16 Mar 2009

We are seeing hits against us.imshell.net, PII is transmitted (an email address) but no pass or other PII is included.

-- WillUrbanski - 27 Apr 2010

Hit from www.microsofc.com/pki/certs/MicCerTruLisPCA/2009-02-01.cr

-- IanR - 12 Aug 2010

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"ET TROJAN Suspicious User-Agent - Possible Trojan Downloader (Shell)"; flow:established,to_server; content:"|0d 0a|User-Agent\: Shell|0d 0a|"; nocase; classtype: trojan-activity; reference:url,doc.emergingthreats.net/2007840; reference:url,www.emergingthreats.net/cgi-bin/cvsweb.cgi/sigs/VIRUS/TROJAN_Downloader_General; sid:2007840; rev:2;)

Added 2009-02-12 18:21:15 UTC

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"ET TROJAN Suspicious User-Agent - Possible Trojan Downloader (Shell)"; flow:established,to_server; content:"|0d 0a|User-Agent\: Shell|0d 0a|"; nocase; classtype: trojan-activity; sid:2007840; rev:1;)

Added 2008-02-11 19:12:32 UTC