Unusual File Deletion by Dns.exe

Description

Detects an unexpected file being deleted by dns.exe which my indicate activity related to remote code execution or other forms of exploitation as seen in CVE-2020-1350 (SigRed)

Query · sigma

selection:
  Image|endswith: \dns.exe
filter:
  TargetFilename|endswith: \dns.log
condition: selection and not filter

Known false positives

  • Unknown
Raw source Unusual File Deletion by Dns.exe · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: Unusual File Deletion by Dns.exe
id: 8f0b1fb1-9bd4-4e74-8cdf-a8de4d2adfd0
related:
    - id: 9f383dc0-fdeb-4d56-acbc-9f9f4f8f20f3 # FileChange version
      type: similar
status: test
description: Detects an unexpected file being deleted by dns.exe which my indicate activity related to remote code execution or other forms of exploitation as seen in CVE-2020-1350 (SigRed)
references:
    - https://www.elastic.co/guide/en/security/current/unusual-file-modification-by-dns-exe.html
author: Tim Rauch (Nextron Systems), Elastic (idea)
date: 2022-09-27
modified: 2023-02-15
tags:
    - attack.persistence
    - attack.initial-access
    - attack.t1133
logsource:
    category: file_delete
    product: windows
detection:
    selection:
        Image|endswith: '\dns.exe'
    filter:
        TargetFilename|endswith: '\dns.log'
    condition: selection and not filter
falsepositives:
    - Unknown
level: high

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