Win.Trojan.Bandook + Win.Trojan.CrossRAT

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

Hi,


Putting these into one email since they belong to the same report/campaign. Two samples (desktop) were identified and 
signatures were written against them. Unfortunately, no signatures against the Android samples. Pcaps are available.


alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"MALWARE-CNC Win.Trojan.Bandook/Anbacas outbound connection attempt"; 
flow:to_server,established; dsize:<250; content:"QDAwMD"; depth:6; fast_pattern; content:"&&&"; within:200; 
isdataat:!0,relative; metadata:ruleset community; 
reference:url,info.lookout.com/rs/051-ESQ-475/images/Lookout_Dark-Caracal_srr_20180118_us_v.1.0.pdf; 
reference:url,www.virustotal.com/#/file/bf600e7b27bdd9e396e5c396aba7f079c244bfb92ee45c721c2294aa36586206/detection; 
classtype:trojan-activity; sid:9000012; rev:1;)

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Win.Trojan.CrossRAT outbound HTTP request"; 
flow:to_server,established; content:"GET"; http_method; content:"/get.php?"; fast_pattern:only; http_uri; 
content:"action=check"; http_uri; content:!"Connection"; http_header; content:!"Accept"; http_header; 
content:!"Referer"; http_header; metadata:ruleset community, service http; 
reference:url,info.lookout.com/rs/051-ESQ-475/images/Lookout_Dark-Caracal_srr_20180118_us_v.1.0.pdf; 
reference:url,www.virustotal.com/#/file/da81aec00b563123d2fbd14fb6a76619c90f81e83c5bd8aa0676922cae96b9ad/detection; 
classtype:trojan-activity; sid:9000013; rev:1;)


tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Win.Trojan.CrossRAT outbound HTTP request"; 
flow:to_server,established; content:"POST"; http_method; content:"/get.php?"; fast_pattern:only; http_uri; 
content:"file1="; http_uri; content:"&file2="; http_uri; content:"&port="; http_uri; content:"&id="; http_uri; 
content:"&name="; http_uri; content:!"Referer"; http_header; metadata:ruleset community, service http; 
reference:url,info.lookout.com/rs/051-ESQ-475/images/Lookout_Dark-Caracal_srr_20180118_us_v.1.0.pdf; 
reference:url,www.virustotal.com/#/file/da81aec00b563123d2fbd14fb6a76619c90f81e83c5bd8aa0676922cae96b9ad/detection; 
classtype:trojan-activity; sid:9000014; rev:1;)

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC User-Agent known malicious user-agent string 
Uploador - Win.Trojan.CrossRAT"; flow:to_server,established; content:"User-Agent|3A| Uploador|0D 0A|"; 
fast_pattern:only; http_header; metadata:ruleset community, service http; 
reference:url,info.lookout.com/rs/051-ESQ-475/images/Lookout_Dark-Caracal_srr_20180118_us_v.1.0.pdf; 
reference:url,www.virustotal.com/#/file/da81aec00b563123d2fbd14fb6a76619c90f81e83c5bd8aa0676922cae96b9ad/detection; 
classtype:trojan-activity; sid:9000015; rev:1;)

alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"MALWARE-CNC Win.Trojan.CrossRAT outbound connection attempt"; 
flow:to_server,established; content:"S_0001|5B|"; depth:7; fast_pattern; content:"&&&"; within:200; 
isdataat:!0,relative; metadata:ruleset community; 
reference:url,info.lookout.com/rs/051-ESQ-475/images/Lookout_Dark-Caracal_srr_20180118_us_v.1.0.pdf; 
reference:url,www.virustotal.com/#/file/da81aec00b563123d2fbd14fb6a76619c90f81e83c5bd8aa0676922cae96b9ad/detection; 
classtype:trojan-activity; sid:9000016; rev:1;)


Thanks.

YM

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