""ET TROJAN Click Fraud Checkin""

SID: 2023669

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 2016_12_19, deployment Perimeter, malware_family Maldoc, performance_impact Low, signature_severity Major, updated_at 2016_12_19

Reference:

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: $HTTP_PORTS

Flow: to_server,established

Contents:

• Value: "GET"

• Value: "/link.txt?"

• Value: "User-Agent|3a| Mozilla/3.0 (compatible|3b| Indy Library)"

Within:

PCRE: "/^\/link.txt\?[0-9]{1,2}\x3a[0-9]{1,2}\x3a[0-9]{1,2}/U"

Special Options:

• nocase

• http_method

• http_uri

• http_header

source