SigmaHQ/rules/windows/deprecated/win_susp_esentutl_activity.yml

title: Suspicious Esentutl Use
id: 56a8189f-11b2-48c8-8ca7-c54b03c2fbf7
status: experimental
description: Detects flags often used with the LOLBAS Esentutl for malicious activity. It could be used in rare cases by administrators to access locked files or during maintenance. 
author: Florian Roth
date: 2020/05/23
references:
    - https://lolbas-project.github.io/
    - https://twitter.com/chadtilbury/status/1264226341408452610
tags:
    - attack.defense_evasion
    - attack.execution
    - attack.s0404
    - attack.t1218
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        CommandLine|contains|all:
            - ' /vss '
            - ' /y '
    condition: selection
fields:
    - CommandLine
    - ParentCommandLine
falsepositives:
    - Administrative activity
level: high
rule: suspicious esentutl use 2020-05-23 16:27:36 +00:00			`title: Suspicious Esentutl Use`
			`id: 56a8189f-11b2-48c8-8ca7-c54b03c2fbf7`
			`status: experimental`
			`description: Detects flags often used with the LOLBAS Esentutl for malicious activity. It could be used in rare cases by administrators to access locked files or during maintenance.`
			`author: Florian Roth`
			`date: 2020/05/23`
			`references:`
			`- https://lolbas-project.github.io/`
			`- https://twitter.com/chadtilbury/status/1264226341408452610`
			`tags:`
			`- attack.defense_evasion`
			`- attack.execution`
			`- attack.s0404`
			`- attack.t1218`
			`logsource:`
			`category: process_creation`
			`product: windows`
			`detection:`
fix: buggy rule 2020-05-23 16:32:02 +00:00			`selection:`
			`CommandLine\|contains\|all:`
rule: suspicious esentutl use 2020-05-23 16:27:36 +00:00			`- ' /vss '`
			`- ' /y '`
			`condition: selection`
			`fields:`
			`- CommandLine`
			`- ParentCommandLine`
			`falsepositives:`
			`- Administrative activity`
			`level: high`