""ET TROJAN Kimsuky Related CnC Activity""

SID: 2034698

Revision: 2

Class Type: trojan-activity

Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_12_13, deployment Perimeter, performance_impact Low, signature_severity Major, updated_at 2022_04_18

Reference:

• Link

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: "/ugd/"

• Value: ".txt"

• Value: "Connection|3a 20|Keep-Alive"

• Value: "Mozilla/4.0|20|(compatible|3b 20|Win32|3b 20|WinHttp.WinHttpRequest.5)"

• Value: !"Referer|3a 20|"

Within:

PCRE: "/^User-Agent\x3a\x20[^\r\n]+Mozilla\/4.0\x20(compatible\x3b\x20Win32\x3b\x20WinHttp.WinHttpRequest.5)/Hmi"

Special Options:

• http_method

• http_uri

• fast_pattern

• http_uri

• http_header

• nocase

• http_header

• http_header

source