""ET TROJAN SoulSearcher Checkin M2""

SID: 2035416

Revision: 4

Class Type: trojan-activity

Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_03_09, deployment Perimeter, performance_impact Low, signature_severity Major, tag c2, updated_at 2023_04_04, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol

Reference:

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: "/en-my/CMSStyles/style.csx?k=" Depth: 29

  • Value: "c.s-microsoft.com"

  • Value: "|00 00 00 11|" Depth: 4

  • Value: "|78 9c|" Depth: 2 Offset: 16

Within:

PCRE: "/^Host\x3a\x20[^\r\n]+c.s-microsoft.com/Hmi"

Special Options:

  • http_method

  • http_uri

  • fast_pattern

  • http_header

  • http_client_body

  • http_client_body

source