""ET CURRENT_EVENTS Windows Scriptlet Invoking Powershell Likely Malicious""

SID: 2024549

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_08_15, deployment Perimeter, malware_family PowerShell, performance_impact Low, signature_severity Major, tag PowerShell, updated_at 2022_05_03

Reference:

Protocol: tcp

Source Network: $EXTERNAL_NET

Source Port: $HTTP_PORTS

Destination Network: $HOME_NET

Destination Port: any

Flow: established,to_client

Contents:

  • Value: "WScript.shell"

  • Value: "ActiveXObject"

  • Value: "<registration"

  • Value: "progid"

  • Value: "<script"

  • Value: "<![CDATA["

Within:

PCRE: "/^.{1,1000}p(?:[\x22\x27]\s[\x26\x2b]\s[\x22\x27])?(?:\^(?:[\x22\x27]\s[\x26\x2b]\s[\x22\x27])?)?o(?:[\x22\x27]\s[\x26\x2b]\s[\x22\x27])?(?:\^(?:[\x22\x27]\s[\x26\x2b]\s[\x22\x27])?)?w(?:[\x22\x27]\s[\x26\x2b]\s[\x22\x27])?(?:\^(?:[\x22\x27]\s[\x26\x2b]\s[\x22\x27])?)?e(?:[\x22\x27]\s[\x26\x2b]\s[\x22\x27])?(?:\^(?:[\x22\x27]\s[\x26\x2b]\s[\x22\x27])?)?r(?:[\x22\x27]\s[\x26\x2b]\s[\x22\x27])?(?:\^(?:[\x22\x27]\s[\x26\x2b]\s[\x22\x27])?)?s(?:[\x22\x27]\s[\x26\x2b]\s[\x22\x27])?(?:\^(?:[\x22\x27]\s[\x26\x2b]\s[\x22\x27])?)?h(?:[\x22\x27]\s[\x26\x2b]\s[\x22\x27])?(?:\^(?:[\x22\x27]\s[\x26\x2b]\s[\x22\x27])?)?e(?:[\x22\x27]\s[\x26\x2b]\s[\x22\x27])?(?:\^(?:[\x22\x27]\s[\x26\x2b]\s[\x22\x27])?)?l(?:[\x22\x27]\s[\x26\x2b]\s[\x22\x27])?(?:\^(?:[\x22\x27]\s[\x26\x2b]\s[\x22\x27])?)?l/Rsi"

Special Options:

  • file_data

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source