""ET TROJAN Win32/Koi Stealer CnC Checkin (POST) M1""

SID: 2049816

Revision: 1

Class Type: trojan-activity

Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, created_at 2023_12_21, deployment Perimeter, performance_impact Moderate, confidence High, signature_severity Major, updated_at 2024_01_02

Reference:

  • md5

  • ef24aa4c496b5d9803e7e37ae0f8e649

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: $HTTP_PORTS

Flow: established,to_server

Contents:

  • Value: "GET"

  • Value: "/index.php?id=" Depth: 14

  • Value: "&subid="

  • Value: "Host|3a 20|" Depth: 6

  • Value: "Connection|3a 20|"

  • Value: !"|3a 20|"

Within: 7

PCRE: "/Host\x3a\x20[^\r\n]+\r\nConnection\x3a\x20[^\r\n]+\r\n\r\n$/Hi"

Special Options:

  • http_method

  • http_uri

  • fast_pattern

  • http_uri

  • http_header

  • http_header

  • http_header

source