""ET TROJAN Possible Covenant Framework Grunt PowerShell Stager HTTP Download""

SID: 2027797

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 2019_08_04, deployment Perimeter, signature_severity Major, updated_at 2019_08_04

Reference:

Protocol: tcp

Source Network: $EXTERNAL_NET

Source Port: $HTTP_PORTS

Destination Network: $HOME_NET

Destination Port: any

Flow: established,to_client

Contents:

  • Value: "IO.Compression.CompressionMode]|3a 3a|Decompress"

  • Value: ".Value.Write("

  • Value: "Reflection.Assembly]|3a 3a|Load("

  • Value: ".EntryPoint.Invoke("

  • Value: "Out-Null"

Within:

PCRE:

Special Options:

  • file_data

  • fast_pattern

source