Win.Trojan.Bitter RAT

[Y M via Snort-sigs <snort-sigs () lists snort org>]

Hi,


Below rules are for detecting two variants of the Bitter RAT. Pcaps for one variant only are available.


alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Win.Trojan.Bitter RAT variant outbound 
connection attempt"; flow:to_server,established; content:"GET"; http_method; content:".php?TIe="; fast_pattern:only; 
http_uri; content:"Connection|3A 20|close|0D 0A|"; http_header; content:!"User-Agent"; http_header; content:!"Accept"; 
http_header; content:!"Referer"; http_header; metadata:ruleset community, service http; 
reference:url,community.rsa.com/community/products/netwitness/blog/2018/01/10/malspam-delivers-bitter-rat-07-01-2018; 
reference:url,community.rsa.com/thread/185482; 
reference:url,blogs.forcepoint.com/security-labs/bitter-targeted-attack-against-pakistan; classtype:trojan-activity; 
sid:9000021; rev:1;)

alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"MALWARE-CNC Win.Trojan.Bitter RAT variant inbound connection 
attempt"; flow:to_client,established; file_data; content:"POF: #"; fast_pattern:only; content:"|0D 0A|SIZE: #"; 
content:"|0D 0A|SRE: #"; metadata:ruleset community, service http; 
reference:url,community.rsa.com/community/products/netwitness/blog/2018/01/10/malspam-delivers-bitter-rat-07-01-2018; 
reference:url,community.rsa.com/thread/185482; 
reference:url,blogs.forcepoint.com/security-labs/bitter-targeted-attack-against-pakistan; classtype:trojan-activity; 
sid:9000022; rev:1;)

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Win.Trojan.Bitter RAT variant outbound 
connection attempt"; flow:to_server,established; content:"GET"; http_method; content:".php?cId="; fast_pattern:only; 
http_uri; content:"&osInfo="; http_uri; content:"Connection|3A 20|close|0D 0A|"; http_header; content:!"User-Agent"; 
http_header; content:!"Accept"; http_header; content:!"Referer"; http_header; metadata:ruleset community, service http; 
reference:url,community.rsa.com/community/products/netwitness/blog/2018/01/10/malspam-delivers-bitter-rat-07-01-2018; 
reference:url,community.rsa.com/thread/185482; 
reference:url,blogs.forcepoint.com/security-labs/bitter-targeted-attack-against-pakistan; 
reference:url,www.virustotal.com/#/file/bad124a847b10641214300317d3f1706a025d57f779428f1fbcc7b4a3b2e9160/detection; 
classtype:trojan-activity; sid:9000023; rev:1;)

alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"MALWARE-CNC Win.Trojan.Bitter RAT variant inbound connection 
attempt"; flow:to_client,established; file_data; content:"EXE: #"; fast_pattern:only; content:"SIZE: #"; 
metadata:ruleset community, service http; 
reference:url,community.rsa.com/community/products/netwitness/blog/2018/01/10/malspam-delivers-bitter-rat-07-01-2018; 
reference:url,community.rsa.com/thread/185482; 
reference:url,blogs.forcepoint.com/security-labs/bitter-targeted-attack-against-pakistan; 
reference:url,www.virustotal.com/#/file/bad124a847b10641214300317d3f1706a025d57f779428f1fbcc7b4a3b2e9160/detection; 
classtype:trojan-activity; sid:9000024; rev:1;)


Thanks.

Yaser

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