Suspicious SSL Connection (via ps_script)

title: Suspicious SSL Connection (via ps_script)
id: 4fa09701-acaf-5ad4-acee-06fed35f410c
status: stable
description: This rule detects threat actors may employ a known encryption algorithm to conceal command and control traffic rather than relying on any inherent protections provided by a communication protocol.
references:
    - https://attack.mitre.org/techniques/T1573/
    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1573/T1573.md#atomic-test-1---openssl-c2
    - https://medium.com/walmartglobaltech/openssl-server-reverse-shell-from-windows-client-aee2dbfa0926
author: Huntrule Team
date: 2026-01-06
tags:
    - attack.command-and-control
    - attack.t1573
logsource:
    product: windows
    category: ps_script
    definition: 'Requirements: Script Block Logging must be enabled'
detection:
    selection:
        ScriptBlockText|contains|all:
            - System.Net.Security.SslStream
            - Net.Security.RemoteCertificateValidationCallback
            - '.AuthenticateAsClient'
    condition: selection
falsepositives:
    - Unknown
level: low