""ET TROJAN MSIL/TrojanDownloader.Small.CLJ CnC Activity""

SID: 2032328

Revision: 2

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2021_03_25, deployment Perimeter, performance_impact Low, signature_severity Major, tag Downloader, updated_at 2021_03_25

Reference:

• md5

• fb7f916531e239c8a705249d93b48598

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: $HTTP_PORTS

Flow: established,to_server

Contents:

• Value: "@"

• Value: "GET /" Depth: 5

• Value: "|20|HTTP/1.1|0d 0a|Referer|3a 20|Microsoft|20|Windows|20|"

Within:

PCRE: "/^Referer\x3a\x20[^\r\n]+\r\nUser-Agent\x3a\x20[^\r\n]+\r\nHost\x3a\x20[^\r\n]+\r\nConnection\x3a\x20[^\r\n]+[\r\n]+$/H"

Special Options:

• http_header

source