""ET TROJAN W32/Fsysna.Downloader CnC Beacon""

SID: 2018462

Revision: 3

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2014_05_09, deployment Perimeter, former_category MALWARE, signature_severity Major, tag c2, updated_at 2022_05_03, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel

Reference:

  • md5

  • 6c040be9d91083ffba59405f9b2c89bf

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: ".php"

  • Value: "Mozilla/4.0 (compatible|3B| MSIE "

  • Value: ".0|3B| Win32|29 3B 20|"

  • Value: "Content-Type|3a 20|/|0d 0a|" Depth: 19

Within: 15

PCRE: "/^User-Agent\x3a\x20Mozilla\/4.0 (compatible\x3b MSIE \d+.0\x3b Win32)\x3b \d+\r?$/Hm"

Special Options:

  • http_method

  • http_uri

  • http_header

  • http_header

  • fast_pattern

  • http_header

source