""ET TROJAN VectorStealer Data Exfil via Telegram""

SID: 2043289

Revision: 2

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2023_01_12, deployment Perimeter, performance_impact Low, signature_severity Major, tag c2, updated_at 2023_04_07, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol

Reference:

  • md5

  • 7a29029e73156fa977badcb2dfab153d

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"

  • Value: "Content-Type|3a 20|multipart/form-data|3b 20|boundary=|22|"

  • Value: "|22 0d 0a|"

  • Value: !"User-Agent|3a 20|"

  • Value: "|0d 0a|Content|2d|Disposition|3a 20|form|2d|data|3b 20|name|3d|document|3b 20|filename|3d|Data|2d|"

  • Value: "."

  • Value: "|2e|zip|0d 0a 0d 0a|PK|03 04|"

  • Value: "userinfo.txt"

Within: 12

PCRE: "/^Content-Type\x3a\x20multipart\/form-data\x3b\x20boundary=\x22[0-9a-f]{8}\b-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-\b[0-9a-f]{12}\x22[\r\n]+$/Hmi"

Special Options:

  • http_method

  • http_uri

  • http_uri

  • http_header

  • nocase

  • http_header

  • http_header

  • http_header

  • http_client_body

  • http_client_body

  • http_client_body

  • http_client_body

source