""ET TROJAN Ursa Loader CnC Checkin""

SID: 2026756

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 2018_12_07, deployment Perimeter, malware_family Ursa_Loader, performance_impact Moderate, signature_severity Major, updated_at 2018_12_07

Reference:

  • md5

  • d05af060e3e104dea638f17c4bceb5ac

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: "User-Agent|3a 20|Mozilla/3.0 (compatible|3b 20|Indy Library)|0d 0a|"

  • Value: "POST / HTTP/1.0" Depth: 15

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

  • Value: !"Referer|3a|"

Within:

PCRE: "/^[a-z]{1,10}=[A-Z]+(?:&[a-z]{1,10}=[A-Z]+){2,}$/Ps"

Special Options:

  • http_method

  • http_header

  • http_header

  • http_header

source