""ET TROJAN PS1/Unknown Payload C2 Downloader (GET)""

SID: 2049428

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_12_01, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Critical, updated_at 2023_12_04

Reference:

  • md5

  • 3061050ea5532508e71b7ab663549ff4

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: "|2f 3f|status|3d|" Depth: 9

  • Value: "&av="

  • Value: "&domain="

  • Value: "&os="

  • Value: "WindowsPowerShell"

Within:

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

Special Options:

  • http_method

  • http_uri

  • fast_pattern

  • http_uri

  • http_uri

  • http_uri

  • http_header

source