""ET TROJAN Ursnif Variant CnC Beacon 3""

SID: 2021814

Revision: 1

Class Type: trojan-activity

Metadata: attack_target Client_Endpoint, created_at 2015_09_23, deployment Perimeter, signature_severity Major, tag c2, updated_at 2015_09_23, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel

Reference:

  • md5

  • 8ab21ac9199d3ced2230924b90f49f0d

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: !"Accept"

  • Value: !"Referer|3a|"

  • Value: "|20 7c 20 22|0x"

  • Value: "_"

  • Value: "|22 20 7c 20|"

  • Value: "User-Agent|3a 20|Mozilla/" Depth: 20

Within:

PCRE:

Special Options:

  • http_method

  • http_header

  • http_header

  • http_client_body

  • fast_pattern

  • http_client_body

  • http_client_body

  • http_header

source