Sigma rule: Suspicious Connection to Remote Account

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-e3c8b03246ee, updated 2021-12-27T00:00:00.000Z.

Rule

Title: Suspicious Connection to Remote Account
Status: test
Level: low
Author: frack113
Date: 2021-12-27
File: rules/windows/powershell/powershell_script/posh_ps_susp_networkcredential.yml
Commit: ccbb0369507f796db0b0ae6854c8a2be471b9d84

Adversaries with no prior knowledge of legitimate credentials within the system or environment may guess passwords to attempt access to accounts.
Without knowledge of the password for an account, an adversary may opt to systematically guess the password using a repetitive or iterative mechanism

Log source

product: windows
category: ps_script
definition: Requirements: Script Block Logging must be enabled

Detection

selection:
    ScriptBlockText|contains:
        - 'System.DirectoryServices.Protocols.LdapDirectoryIdentifier'
        - 'System.Net.NetworkCredential'
        - 'System.DirectoryServices.Protocols.LdapConnection'
condition: selection

False positives (as the rule lists them)

Unknown

MITRE ATT&CK ids this rule names

T1110.001

References

https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1110.001/T1110.001.md#atomic-test-2---brute-force-credentials-of-single-active-directory-domain-user-via-ldap-against-domain-controller-ntlm-or-kerberos

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_networkcredential.yml

Sources and licences

SigmaHQ
"Suspicious Connection to Remote Account" by frack113 (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/powershell/powershell_script/posh_ps_susp_networkcredential.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 Connection to Remote Account",
entity page, dataset version ref-e3c8b03246ee, updated 2021-12-27T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/1883444f-084b-419b-ac62-e0d0c5b3693f (accessed 2026-11-03).
Underlying source: SigmaHQ rule 1883444f-084b-419b-ac62-e0d0c5b3693f, 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.