""ET TROJAN ClearFake CnC Checkin (POST)""

SID: 2053416

Revision: 1

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2024_06_10, deployment Perimeter, deployment SSLDecrypt, malware_family ClearFake, confidence Medium, signature_severity Critical, tag c2, updated_at 2024_06_10, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol

Reference:

  • md5

  • b3b735852084909f82121fd6fbbdeb68

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: $HTTP_PORTS

Flow: established,to_server

Contents:

  • Value: "POST"

  • Value: "|2f|post|2e|php|3f|status|3d|" Depth: 17

  • Value: !"|0d 0a|Referer|3a 20|"

  • Value: "|0d 0a|Connection|3a 20|Keep-Alive|0d 0a|"

  • Value: "Content-Type|3a 20|application/x-www-form-urlencoded|0d 0a|"

  • Value: "|0d 0a|Conent-Length|3a 20|0|0d 0a|"

Within:

PCRE: "/^\x2fpost\x2ephp\x3fstatus\x3d\d$/U"

Special Options:

  • http_method

  • http_uri

  • fast_pattern

  • http_header

  • http_header

  • http_header

  • http_header

source