Detection rules › Sigma
Suspicious RunAs-Like Flag Combination
Detects suspicious command line flags that let the user set a target user and command as e.g. seen in PsExec-like tools
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Privilege Escalation | No specific technique |
Event coverage
| Provider | Event | Title |
|---|---|---|
| Sysmon | Event ID 1 | Process creation |
| Security-Auditing | Event ID 4688 | A new process has been created. |
Rule body yaml
title: Suspicious RunAs-Like Flag Combination
id: 50d66fb0-03f8-4da0-8add-84e77d12a020
status: test
description: Detects suspicious command line flags that let the user set a target user and command as e.g. seen in PsExec-like tools
references:
- https://www.trendmicro.com/en_us/research/22/k/hack-the-real-box-apt41-new-subgroup-earth-longzhi.html
author: Florian Roth (Nextron Systems)
date: 2022-11-11
tags:
- attack.privilege-escalation
logsource:
category: process_creation
product: windows
detection:
selection_user:
CommandLine|contains:
- ' -u system '
- ' --user system '
- ' -u NT'
- ' -u "NT'
- " -u 'NT"
- ' --system '
- ' -u administrator '
selection_command:
CommandLine|contains:
- ' -c cmd'
- ' -c "cmd'
- ' -c powershell'
- ' -c "powershell'
- ' --command cmd'
- ' --command powershell'
- ' -c whoami'
- ' -c wscript'
- ' -c cscript'
condition: all of selection*
falsepositives:
- Unknown
level: medium
Stages and Predicates
Stage 0: condition
all of selection*Stage 1: selection_user
selection_user:
CommandLine|contains:
- ' -u system '
- ' --user system '
- ' -u NT'
- ' -u "NT'
- " -u 'NT"
- ' --system '
- ' -u administrator '
Stage 2: selection_command
selection_command:
CommandLine|contains:
- ' -c cmd'
- ' -c "cmd'
- ' -c powershell'
- ' -c "powershell'
- ' --command cmd'
- ' --command powershell'
- ' -c whoami'
- ' -c wscript'
- ' -c cscript'
Indicators
Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.
| Field | Kind | Values |
|---|---|---|
CommandLine | match |
|