""ET TROJAN Locky Intermediate Downloader""

SID: 2024900

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 2017_10_23, deployment Perimeter, signature_severity Major, tag Locky, updated_at 2017_10_23

Reference:

  • md5

  • 4f03e360be488a3811d40c113292bc01

Protocol: tcp

Source Network: $HOME_NET

Source Port: any

Destination Network: $EXTERNAL_NET

Destination Port: $HTTP_PORTS

Flow: to_server,established

Contents:

  • Value: "POST"

  • Value: "User-Agent|3a 20|Windows-Update-Agent"

  • Value: !"Referer|3a|"

Within:

PCRE: "/^[\x20-\x7e\r\n]{0,20}[^\x20-\x7e\r\n]/P"

Special Options:

  • http_method

  • http_header

  • fast_pattern

  • http_header

source