""ET TROJAN Cobalt Strike Activity (GET)""
SID: 2034346
Revision: 2
Class Type: trojan-activity
Metadata: attack_target Client_Endpoint, created_at 2021_11_05, deployment Perimeter, deployment SSLDecrypt, signature_severity Major, tag c2, updated_at 2021_11_05, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel
Reference:
Protocol: tcp
Source Network: $HOME_NET
Source Port: any
Destination Network: $EXTERNAL_NET
Destination Port: $HTTP_PORTS
Flow: established,to_server
Contents:
-
Value: "User-Agent|3a 20|Mozilla/5.0|20|(compatible|3b 20|MSIE|20|9.0|3b 20|Windows|20|NT|20|6.0|3b 20|Trident/5.0)|0d 0a|"
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Value: "GET /EbhM HTTP/1.1"
-
Value: !"Referer|3a 20|"
Within:
PCRE: "/^Host\x3a\x20\d{1,3}.\d{1,3}.\d{1,3}.\d{1,3}$/Hm"
Special Options:
-
http_header
-
fast_pattern
-
http_header