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

SID: 2034646

Revision: 2

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2021_12_09, deployment Perimeter, deployment SSLDecrypt, malware_family CobaltStrike, signature_severity Major, tag c2, updated_at 2022_04_18, reviewed_at 2023_08_22, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel

Reference:

  • md5

  • f3e31cd5f0972e4dbc789807ad2d129b

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: $HTTP_PORTS

Flow: established,to_server

Contents:

  • Value: "GET"

  • Value: "/static-directory/bn.png"

  • Value: "Linux|3b 20|Android|20|"

  • Value: !"Referer|3a 20|"

Within:

PCRE: "/^User-Agent\x3a\x20[^\r\n]+Linux\x3b\x20Android\x20/Hmi"

Special Options:

  • http_method

  • http_uri

  • fast_pattern

  • http_header

  • http_header

source