Psexec Execution

Status: test
Severity: medium
Log source: category process_creation, product windows
Author: omkar72
Source: github.com/SigmaHQ/sigma

Detects user accept agreement execution in psexec commandline

Known false positives

Administrative scripts.

MITRE ATT&CK coverage

Tactic	Techniques
Execution	`T1569` System Services
Lateral Movement	`T1021` Remote Services

Telemetry coverage

Provider	Record / event type
Sysmon	Event ID 1: Process creation

Rule body

title: Psexec Execution
id: 730fc21b-eaff-474b-ad23-90fd265d4988
status: test
description: Detects user accept agreement execution in psexec commandline
references:
    - https://www.fireeye.com/blog/threat-research/2020/10/kegtap-and-singlemalt-with-a-ransomware-chaser.html
author: omkar72
date: 2020-10-30
modified: 2023-02-28
tags:
    - attack.execution
    - attack.lateral-movement
    - attack.t1569
    - attack.t1021
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        - Image|endswith: '\psexec.exe'
        - OriginalFileName: 'psexec.c'
    condition: selection
falsepositives:
    - Administrative scripts.
level: medium

Stages and Predicates

Stage 0: `condition`

selection

Stage 1: `selection`

selection:
    - Image|endswith: '\psexec.exe'
    - OriginalFileName: 'psexec.c'

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`Image`	ends_with	`\psexec.exe` corpus 2 (sigma 2)	`field:"Image" kind:ends_with value:"\psexec.exe"`
`OriginalFileName`	eq	`psexec.c` corpus 7 (elastic 3, sigma 2, splunk 2)	`field:"OriginalFileName" kind:eq value:"psexec.c"`

Psexec Execution

Known false positives

MITRE ATT&CK coverage

Telemetry coverage

Rule body

Stages and Predicates

Stage 0: condition

Stage 1: selection

Indicators

Stage 0: `condition`

Stage 1: `selection`