""ET TROJAN [ANY.RUN] Win32/ObserverStealer CnC Activity (Loading) M2""

SID: 2046170

Revision: 2

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_23, reviewed_at 2024_01_26

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: "/s?id=" Depth: 6

  • Value: ".NET"

  • Value: "Accept|3a 20 2a 2f 2a 0d 0a|"

  • Value: "Accept-Encoding|3a 20|gzip|2c 20|deflate|0d 0a|"

  • Value: "Connection|3a 20|Keep-Alive|0d 0a|"

Within:

PCRE: "/Host\x3a\x20(?:(?:\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5]).){3}(?:\d|[1-9]\d|1\d\d|2[0-4]\d|25[0-5])(:\d{2,5})?/H"

Special Options:

  • http_method

  • http_uri

  • fast_pattern

  • http_header

  • http_header

  • http_header

  • http_header

source