""ET TROJAN AlphaCrypt CnC Beacon 3""

SID: 2021723

Revision: 4

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2015_08_27, deployment Perimeter, signature_severity Major, tag c2, updated_at 2015_08_27, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel

Reference:

  • md5

  • 0a4d0e5d0b69560414bbd20127bd8176

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: "/r.php?"

  • Value: !"Accept"

  • Value: !"Referer|3a|"

  • Value: "User-Agent|3a 20|" Depth: 12

Within:

PCRE: "/\/r.php\?[A-F0-9]+=?$/U"

Special Options:

  • http_method

  • http_uri

  • http_header

  • http_header

  • http_header

source