""ET TROJAN PSRansom File Exfiltration (POST)""

SID: 2042769

Revision: 1

Class Type: trojan-activity

Metadata: affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_12_13, deployment Perimeter, deployment SSLDecrypt, signature_severity Major, updated_at 2022_12_13

Reference:

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: "/files/" Depth: 7

  • Value: "WindowsPowerShell/"

  • Value: "Content|2d|Length|3a 20|43|0d 0a|Connection|3a 20|Keep|2d|Alive|0d 0a 0d 0a|"

Within:

PCRE: "/^[a-zA-Z0-9_+]{43}$/P"

Special Options:

  • http_method

  • http_uri

  • http_header

  • http_header

source