PrintBrm ZIP Creation of Extraction

Hunt Hypothesis

Detects the execution of the LOLBIN PrintBrm.exe, which can be used to create or extract ZIP files. PrintBrm.exe should not be run on a normal workstation.

Detection Rule

Sigma (Original)

title: PrintBrm ZIP Creation of Extraction
id: cafeeba3-01da-4ab4-b6c4-a31b1d9730c7
status: test
description: Detects the execution of the LOLBIN PrintBrm.exe, which can be used to create or extract ZIP files. PrintBrm.exe should not be run on a normal workstation.
references:
    - https://lolbas-project.github.io/lolbas/Binaries/PrintBrm/
author: frack113
date: 2022-05-02
tags:
    - attack.command-and-control
    - attack.stealth
    - attack.t1105
    - attack.t1564.004
logsource:
    product: windows
    category: process_creation
detection:
    selection:
        Image|endswith: '\PrintBrm.exe'
        CommandLine|contains|all:
            - ' -f'
            - '.zip'
    condition: selection
falsepositives:
    - Unknown
level: high

KQL (Azure Sentinel)

imProcessCreate
| where TargetProcessName endswith "\\PrintBrm.exe" and (TargetProcessCommandLine contains " -f" and TargetProcessCommandLine contains ".zip")

Required Data Sources

False Positive Guidance

• Unknown

MITRE ATT&CK Context

• Tactic: Command and Control
• Technique: T1105 — T1105
• Technique: T1564.004 — T1564.004

References

• https://lolbas-project.github.io/lolbas/Binaries/PrintBrm/
• SigmaHQ Rule