Win.Trojan.PowerStat

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

Hi,


The below two signatures are originally driven by the following references. The sample on VT is referenced in the 
signatures. Pcap is available.


https://reaqta.com/2017/11/muddywater-apt-targeting-middle-east/
https://researchcenter.paloaltonetworks.com/2017/11/unit42-muddying-the-water-targeted-attacks-in-the-middle-east/
http://blog.morphisec.com/fileless-attack-framework-discovery
https://blog.malwarebytes.com/threat-analysis/2017/09/elaborate-scripting-fu-used-in-espionage-attack-against-saudi-arabia-government_entity/

Opted for two separate signatures as opposed to using pcre.

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Win.Trojan.PowerStat variant outbound connection 
to proxy"; flow:to_server,established; urilen:>50; content:"GET"; http_method; content:".php?c="; http_uri; 
fast_pattern:only; content:"Connection|3A 20|"; http_header; content:!"User-Agent"; http_header; content:!"Accept"; 
http_header; content:!"Referer"; http_header; content:!"Cookie"; http_header; content:!"Content"; http_header; 
metadata:ruleset community, service http; 
reference:url,www.virustotal.com/#/file/16985600c959f6267476da614243a585b1b222213ec938351ef6a26560c992db/detection; 
classtype:trojan-activity; sid:9000004; rev:2;)

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Win.Trojan.PowerStat variant outbound connection 
to proxy"; flow:to_server,established; urilen:>50; content:"GET"; http_method; content:".aspx?c="; http_uri; 
fast_pattern:only; content:"Connection|3A 20|"; http_header; content:!"User-Agent"; http_header; content:!"Accept"; 
http_header; content:!"Referer"; http_header; content:!"Cookie"; http_header; content:!"Content"; http_header; 
metadata:ruleset community, service http; 
reference:url,www.virustotal.com/#/file/16985600c959f6267476da614243a585b1b222213ec938351ef6a26560c992db/detection; 
classtype:trojan-activity; sid:9000005; rev:2;)

Thanks.
YM

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