""ET TROJAN [ANY.RUN] Win32/ObserverStealer CnC Activity (Activity)""

SID: 2046153

Revision: 1

Class Type: trojan-activity

Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_06_07, deployment Perimeter, malware_family ObserverStealer, confidence High, signature_severity Critical, updated_at 2023_06_07

Reference:

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: $HTTP_PORTS

Flow: established,to_server

Contents:

  • Value: "POST"

  • Value: "X-Session|3a 20|"

  • Value: "X-ID|3a 20|"

  • Value: !"|0d 0a|"

  • Value: "Content-Length: 40|0d 0a|"

  • Value: "X-Config|3a 20|"

Within:

PCRE: "/\x0d\x0a([0-9a-f]{8})-([0-9a-f]{4})-([0-9a-f]{4})-([0-9a-f]{4})-([0-9a-f]{12})/H"

Special Options:

  • http_method

  • http_header

  • http_header

  • http_header

  • http_header

  • http_header

  • fast_pattern

source