""ET TROJAN [ANY.RUN] DarkCrystal Rat Exfiltration (POST)""

SID: 2048130

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_09_20, deployment Perimeter, malware_family DCRat, confidence High, signature_severity Critical, updated_at 2023_09_20, reviewed_at 2023_09_20

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: "Expect|3a 20|100|2d|continue|0d 0a|"

  • Value: "Content|2d|Disposition|3a 20|form|2d|data|3b 20|name|3d 22|"

  • Value: "|22 0d 0a|Content|2d|Type|3a 20|text|2f|plain"

  • Value: "Content|2d|Disposition|3a 20|form|2d|data|3b 20|name|3d 22|"

  • Value: "|0d 0a|Content|2d|Type|3a 20|application|2f|octet|2d|stream|0d 0a 0d 0a|UEsDB"

  • Value: "|0d 0a|Content-Type|3a 20|multipart|2f|form|2d|data|3b 20|boundary|3d 2d 2d 2d 2d|"

Within: 28

PCRE: "/^(?P[a-z0-9]{40})\x22\x3b\x20filename\x3d\x22(?P=filename)\x22/R"

Special Options:

  • http_method

  • http_header

  • http_client_body

  • http_client_body

  • http_client_body

  • http_client_body

source