Sigma rule: Suspicious SSL Connection

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-7fcd12527a14, updated 2022-01-23T00:00:00.000Z.

Rule

Title
Suspicious SSL Connection
Status
test
Level
low
Author
frack113
Date
2022-01-23
File
rules/windows/powershell/powershell_script/posh_ps_susp_ssl_keyword.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Adversaries may employ a known encryption algorithm to conceal command and control traffic rather than relying on any inherent protections provided by a communication protocol.

Log source

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

False positives (as the rule lists them)

  • Legitimate administrative script

Tags

  • attack.command-and-control
  • attack.t1573

MITRE ATT&CK ids this rule names

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/powershell/powershell_script/posh_ps_susp_ssl_keyword.yml

Sources and licences

  • SigmaHQ

    "Suspicious SSL Connection" by frack113 (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/powershell/powershell_script/posh_ps_susp_ssl_keyword.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Suspicious SSL Connection",
entity page, dataset version ref-7fcd12527a14, updated 2022-01-23T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/195626f3-5f1b-4403-93b7-e6cfd4d6a078 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 195626f3-5f1b-4403-93b7-e6cfd4d6a078, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.