""ET CURRENT_EVENTS Likely Malicious Windows SCT Download MSXMLHTTP M3""

SID: 2024552

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 2017_08_15, deployment Perimeter, malware_family PowerShell, signature_severity Major, tag PowerShell_Downloader, updated_at 2020_11_10

Reference:

Protocol: tcp

Source Network: $EXTERNAL_NET

Source Port: $HTTP_PORTS

Destination Network: $HOME_NET

Destination Port: any

Flow: established,from_server

Contents:

• Value: "Content-Disposition|3a 20|"

• Value: ".sct"

Within:

PCRE: "/^Content-Disposition\x3a[^\r\n]*.sct[\x22\x27\s\r\n]/Hmi"

Special Options:

• nocase

• http_header

• http_header

• nocase

source