""ET TROJAN MSIL/BlackGuard Stealer Variant Exfil via Telegram""

SID: 2035397

Revision: 3

Class Type: trojan-activity

Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_03_07, deployment Perimeter, deployment SSLDecrypt, malware_family BlackGuard, performance_impact Low, signature_severity Major, tag Stealer, updated_at 2022_03_08

Reference:

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: $HTTP_PORTS

Flow: established,to_server

Contents:

  • Value: "%E2%9A%99%EF%B8%8F%20Windows%20"

  • Value: "POST"

  • Value: "/bot" Depth: 4

  • Value: "/sendDocument?chat_id="

  • Value: "&caption="

  • Value: "%E2%9A%99%EF%B8%8F%20Windows%20"

  • Value: "BROWSER:%0A"

  • Value: "%0A%0A%20Link%20"

  • Value: "Host|3a 20|api.telegram.org"

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

  • Value: ".zip|22 0d 0a|Content-Type|3a 20|application/x-ms-dos-executable"

Within:

PCRE:

Special Options:

  • http_method

  • http_uri

  • http_uri

  • http_uri

  • http_raw_uri

  • nocase

  • http_raw_uri

  • nocase

  • http_raw_uri

  • nocase

  • http_header

  • http_client_body

  • http_client_body

source