""ET TROJAN Win32/Cryptbot V2 Data Exfiltration Attempt""

SID: 2038947

Revision: 4

Class Type: trojan-activity

Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_09_22, deployment Perimeter, malware_family Cryptbot, performance_impact Low, confidence High, signature_severity Major, updated_at 2023_08_22, reviewed_at 2023_08_21

Reference:

  • md5

  • 859c659aee8b897aeebf4b87364cc6d1

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"

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

  • Value: !"Referer|3a 20|"

  • Value: "Content-Disposition|3a 20|form-data|3b 20|name|3d 22|files|5b 5d 22 3b 20|filename|3d 22|"

Within:

PCRE: "/boundary=[A-Z0-9]{6,11}/Hi"

Special Options:

  • http_method

  • http_header

  • http_header

source