[Emerging-Sigs] KBot C2 Sig

elhijo at 0lim.net elhijo at 0lim.net
Wed Feb 12 05:39:01 HST 2020


Hi,

was trying to send you same issue through ET feedback webpage but I get bad gateway error every time I submit my request.

sid:2820288

All alerts linked to i[1234]4.c.eset.com

Cheers,

David
February 12, 2020 4:30 PM, "Stuart Gonzalez" <stu at perchsecurity.com (mailto:stu at perchsecurity.com?to=%22Stuart%20Gonzalez%22%20<stu at perchsecurity.com>)> wrote:
	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-x7ern]{0,20}[^x20-x7ern]/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://securelist.com/kbot-sometimes-they-come-back/96157/) 

	https://www.virustotal.com/gui/file/406a4fcb391cc8098d1a6578e2609c21f0f59ca2386f926e3438c57e4549c966/behavior/VirusTotal%20Cuckoofork (https://www.virustotal.com/gui/file/406a4fcb391cc8098d1a6578e2609c21f0f59ca2386f926e3438c57e4549c966/behavior/VirusTotal%20Cuckoofork)  
	 (http://perchsecurity.com)  

	Stuart Gonzalez /  Chief Bot Officer
stu at perchsecurity.com (mailto:stu at perchsecurity.com) / 713.591.1602 

	PERCH
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