[Emerging-Sigs] KBot C2 Sig

Stuart Gonzalez stu at perchsecurity.com
Wed Feb 12 05:30:04 HST 2020


Hi Team,

Looking through this sig and wondering if the content match for “.eset.com” should have been negated. I reviewed the references, as well as, other malware repos for this malware and found no indication C2 traffic destined for eset subdomains.

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ETPRO TROJAN Bolek/Kbot CnC Checkin"; flow:established,to_server; urilen:1; content:"POST"; http_method; pcre:"/^[\x20-\x7e\r\n]{0,20}[^\x20-\x7e\r\n]/Ps"; content:".eset.com"; http_host; isdataat:!1,relative; http_header_names; content:"|0d 0a|Host|0d 0a|Content-Length|0d 0a|Connection|0d 0a|"; depth:36; fast_pattern; content:!"Accept"; content:!"Referer"; metadata: former_category MALWARE; reference:md5,24a497e3993289168455f12d11f0430f; reference:md5,2d7ce4c681bdbddf4ab2740f5fb589dc; classtype:trojan-activity; sid:2820288; rev:5; metadata:created_at 2016_05_20, updated_at 2020_02_11;)

https://securelist.com/kbot-sometimes-they-come-back/96157/
https://www.virustotal.com/gui/file/406a4fcb391cc8098d1a6578e2609c21f0f59ca2386f926e3438c57e4549c966/behavior/VirusTotal%20Cuckoofork



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