""ET TROJAN Win32/GenKryptik.GCJX Data Exfiltration Attempt""

SID: 2044432

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_03_02, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, updated_at 2023_03_02

Reference:

  • md5

  • 06c4268136192ad2d04af2c91c4be522

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: "/gate.php?namelog=" Depth: 18

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

  • Value: "|2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d|" Depth: 23

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

  • Value: "|0d 0a|Content-Type|3a 20|application/octet-stream"

  • Value: "|0d 0a 0d 0a|PK"

  • Value: "Processes.txt"

  • Value: "Screenshot.jpg"

Within:

PCRE: "/^[a-f0-9]{15}/R"

Special Options:

  • http_method

  • http_uri

  • fast_pattern

  • http_header

  • http_client_body

  • http_client_body

  • http_client_body

  • http_client_body

  • http_client_body

  • http_client_body

source