""ET TROJAN 44Calibar Variant Exfil via Telegram""

SID: 2033455

Revision: 2

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2021_07_27, deployment Perimeter, deployment SSLDecrypt, signature_severity Major, updated_at 2021_07_27

Reference:

  • md5

  • fc489c5343f6db7d1be798a3ee331bdf

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: "/bot" Depth: 4

  • Value: "/sendDocument"

  • Value: "Host|3a 20|api.telegram.org|0d 0a|"

  • Value: "name|3d|caption|0d 0a 0d 0a|"

  • Value: "44CALIBER"

  • Value: "Grabbed Software|3a|"

Within: 15

PCRE:

Special Options:

  • http_method

  • http_uri

  • http_uri

  • http_header

  • http_client_body

  • http_client_body

  • nocase

  • fast_pattern

  • http_client_body

source