IIS WebServer Access Logs Deleted — Sigma Rule

Rule metadata and linked tags

Author: Tim Rauch (Nextron Systems), Nasreddine Bencherchali (Nextron Systems). Source status: test; severity: medium. Source dates: 2022-09-16 / 2023-02-15.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 0458ee0fb2470c4bd6442e5b52eb5098c1c72c9300fb3f7e727f2b9bdc80036b

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: IIS WebServer Access Logs Deleted
id: 3eb8c339-a765-48cc-a150-4364c04652bf
related:
    - id: 0649be4a-aeb0-45b0-b89e-7f1668f6d9c0
      type: similar
status: test
description: Detects the deletion of IIS WebServer access logs which may indicate an attempt to destroy forensic evidence
references:
    - https://www.elastic.co/guide/en/security/current/webserver-access-logs-deleted.html
author: Tim Rauch (Nextron Systems), Nasreddine Bencherchali (Nextron Systems)
date: 2022-09-16
modified: 2023-02-15
tags:
    - attack.stealth
    - attack.t1070
logsource:
    category: file_delete
    product: windows
detection:
    selection:
        TargetFilename|contains: '\inetpub\logs\LogFiles\'
        TargetFilename|endswith: '.log'
    condition: selection
falsepositives:
    - During uninstallation of the IIS service
    - During log rotation
level: medium

Original YAML and metadata in JSON

False positives

• During uninstallation of the IIS service
• During log rotation

Source references

• https://www.elastic.co/guide/en/security/current/webserver-access-logs-deleted.html