""ET TROJAN [ANY.RUN] DarkCrystal Rat Check-in (POST)""

SID: 2048095

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_09_15, deployment Perimeter, malware_family DCRat, confidence High, signature_severity Critical, updated_at 2023_09_20, 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: "POST"

  • Value: "|05 06 02 01 02|" Depth: 5 Offset: 8

  • Value: "Expect|3a 20|100|2d|continue|0d 0a|Connection|3a 20|Keep-Alive|0d 0a 0d 0a|"

  • Value: !"Referer|3a 20|"

  • Value: "Content-Length|3a 20|"

Within:

PCRE: "/^(?:((?:32[0-9])|(?:[3][3-6][0-9])|370))\x0d\x0a/R"

Special Options:

  • http_method

  • http_client_body

  • fast_pattern

  • http_header

  • http_header

source