PrintBrm ZIP Creation of Extraction

Status: test
Severity: high
Log source: category process_creation, product windows
Author: frack113
Source: github.com/SigmaHQ/sigma

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.

MITRE ATT&CK coverage

Tactic	Techniques
Stealth	`T1564.004` Hide Artifacts: NTFS File Attributes
Command & Control	`T1105` Ingress Tool Transfer

Telemetry coverage

Provider	Record / event type
Sysmon	Event ID 1: Process creation
Security-Auditing	Event ID 4688: A new process has been created.

Rule body

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

Stages and Predicates

Stage 0: `condition`

selection

Stage 1: `selection`

selection:
    Image|endswith: '\PrintBrm.exe'
    CommandLine|contains|all:
        - ' -f'
        - '.zip'

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`CommandLine`	match	`-f` corpus 4 (sigma 3, chronicle 1) `.zip` corpus 6 (sigma 5, chronicle 1)	`field:"CommandLine" kind:match`
`Image`	ends_with	`\PrintBrm.exe`	`field:"Image" kind:ends_with value:"\PrintBrm.exe"`