Sigma rule: New Lolbin Process by Office Applications

Rule

Title

New Lolbin Process by Office Applications

Status

deprecated

Level

high

Author

Vadim Khrykov (ThreatIntel), Cyb3rEng (Rule), Michael Haag, Christopher Peacock @securepeacock (Update), SCYTHE @scythe_io (Update)

Date

2021/08/23

Modified

2023/02/04

File

deprecated/windows/proc_creation_win_lolbins_by_office_applications.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

This rule will monitor any office apps that spins up a new LOLBin process. This activity is pretty suspicious and should be investigated.

Log source

product

windows

category

process_creation

Detection

#useful_information: add more LOLBins to the rules logic of your choice.
selection:
    Image|endswith:
        - '\regsvr32.exe'
        - '\rundll32.exe'
        - '\msiexec.exe'
        - '\mshta.exe'
        - '\verclsid.exe'
        - '\msdt.exe'
        - '\control.exe'
        - '\msidb.exe'
    ParentImage|endswith:
        - '\winword.exe'
        - '\excel.exe'
        - '\powerpnt.exe'
        - '\msaccess.exe'
        - '\mspub.exe'
        - '\eqnedt32.exe'
        - '\visio.exe'
        - '\wordpad.exe'
        - '\wordview.exe'
condition: selection

False positives (as the rule lists them)

• Unknown

Tags

• attack.t1204.002
• attack.t1047
• attack.t1218.010
• attack.execution
• attack.defense_evasion

MITRE ATT&CK ids this rule names

• T1047
• T1204.002
• T1218.010

References

• https://thedfirreport.com/2021/03/29/sodinokibi-aka-revil-ransomware/
• https://doublepulsar.com/follina-a-microsoft-office-code-execution-vulnerability-1a47fce5629e
• https://github.com/vadim-hunter/Detection-Ideas-Rules/blob/02bcbfc2bfb8b4da601bb30de0344ae453aa1afe/Threat%20Intelligence/The%20DFIR%20Report/20210329_Sodinokibi_(aka_REvil)_Ransomware.yaml
• https://github.com/splunk/security_content/blob/develop/detections/endpoint/office_spawning_control.yml
• https://twitter.com/andythevariable/status/1576953781581144064?s=20&t=QiJILvK4ZiBdR8RJe24u-A
• https://www.elastic.co/security-labs/exploring-the-ref2731-intrusion-set

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