""ET TROJAN Cobalt Strike Activity (GET)""

SID: 2034726

Revision: 2

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2021_12_14, deployment Perimeter, malware_family CobaltStrike, signature_severity Major, tag c2, updated_at 2021_12_14, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel

Reference:

• md5

• b873bfa8dec8c3a1f62c30903e59e849

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: $HTTP_PORTS

Flow: established,to_server

Contents:

• Value: "Cookie|3a 20|HSID="

• Value: "HSID=" Depth: 5

• Value: "GET /azure/v2/api HTTP/1.1"

• Value: !"Referer|3a 20|"

Within:

PCRE: "/^Host\x3a\x20[^\r\n]+\r\nConnection\x3a\x20[^\r\n]+\r\nCache-Control\x3a\x20[^\r\n]+\r\n/Hm"

Special Options:

• http_header

• http_cookie

• fast_pattern

• http_header

source