Monday, December 26, 2016

1:41088 MALWARE-CNC Win.Trojan.MrWhite Win.Trojan.Ostap out bound communication attempt

I previously wrote about documentation-less snort rules. Below is my attempt to fill in some of those gaps.

Whomever created these trojan connection attempts snort alert didn't include documentation.

(1:41089) MALWARE-CNC Win.Trojan.Ostap out bound communication attempt

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Win.Trojan.Ostap out bound communication attempt"; flow:to_server,established; content:"/ostap.php"; fast_pattern:only; http_uri; content:"/ostap.php"; depth:20; offset:2; http_uri; metadata:impact_flag red, policy balanced-ips drop, policy security-ips drop, service http; classtype:trojan-activity; sid:41089; rev:1; )

(1:41088) MALWARE-CNC Win.Trojan.MrWhite out bound communication attempt

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Win.Trojan.MrWhite out bound communication attempt"; flow:to_server,established; content:"/GOLD/bender.php"; http_uri; content:"User-Agent: Mr.White|0D 0A|"; fast_pattern:only; http_header; metadata:impact_flag red, policy balanced-ips drop, policy security-ips drop, service http; classtype:trojan-activity; sid:41088; rev:1; )


If I had to guess I think it's related to this JScript backdoor or something similar which stated.

Per the article it says MrWhite can profile the victim systems for the presence of running POS software before dropping further POS payloads. Related to financially-motivated threat actor group with access to banking Trojans and other malware, including Dridex, Ursnif, Tinba, and the point-of-sale (POS) malware AbaddonPOS with its loader, TinyLoader.

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