Suspicious File Created In PerfLogs — Sigma Rule

Rule metadata and linked tags

Author: Nasreddine Bencherchali (Nextron Systems). Source status: test; severity: medium. Source dates: 2023-05-05 / not supplied.

{
  "category": "file_event",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: ee5db7abb1c78a05ea6b98af46c7f64d3f797d8e3f1a6743dc98b6a3757ad445

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Suspicious File Created In PerfLogs
id: bbb7e38c-0b41-4a11-b306-d2a457b7ac2b
status: test
description: Detects suspicious file based on their extension being created in "C:\PerfLogs\". Note that this directory mostly contains ".etl" files
references:
    - Internal Research
    - https://labs.withsecure.com/publications/fin7-target-veeam-servers
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-05-05
tags:
    - attack.execution
    - attack.t1059
logsource:
    category: file_event
    product: windows
detection:
    selection:
        TargetFilename|startswith: 'C:\PerfLogs\'
        TargetFilename|endswith:
            - '.7z'
            - '.bat'
            - '.bin'
            - '.chm'
            - '.dll'
            - '.exe'
            - '.hta'
            - '.lnk'
            - '.ps1'
            - '.psm1'
            - '.py'
            - '.scr'
            - '.sys'
            - '.vbe'
            - '.vbs'
            - '.zip'
    condition: selection
falsepositives:
    - Unlikely
level: medium

Original YAML and metadata in JSON

False positives

• Unlikely

Source references

• Internal Research (source note; no public URL supplied)
• https://labs.withsecure.com/publications/fin7-target-veeam-servers