Win.Trojan.InvisiMole

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

Hi,

A pcap with partial C&C communication is available for the first rule. The second rule is derived from the research 
reference.

# --------------------
# Date: 2018-06-11
# Title: InvisiMole: surprisingly equipped spyware, undercover since 2013
# Tests: pcap (partial)
# Reference: https://www.welivesecurity.com/2018/06/07/invisimole-equipped-spyware-undercover/
# Confidence: low

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Win.Trojan.InvisiMole outbound connection"; 
flow:to_server,established; content:"GET"; http_method; content:"/www/|25|"; fast_pattern:only; content:"/00";  
content:!"Accept"; content:!"Referer"; metadata:ruleset community, service http; 
reference:url,www.virustotal.com/#/file/cd54a42008631d3e21eb663b71aac0d9cbb3d6d9ca34209a4cc9a278a3b445e0/detection; 
classtype:trojan-activity; sid:8000118; rev:1;)

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Win.Trojan.InvisiMole outbound connection"; 
flow:to_server,established; content:"HIDE"; http_method; content:"/in_U"; fast_pattern:only;  content:!"Accept"; 
content:!"Referer"; metadata:ruleset community, service http; 
reference:url,www.virustotal.com/#/file/cd54a42008631d3e21eb663b71aac0d9cbb3d6d9ca34209a4cc9a278a3b445e0/detection; 
classtype:trojan-activity; sid:8000119; rev:1;)

Thanks.
YM

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