Unusual File Deletion by Dns.exe

testhigh
log source: windows · file_deleteauthor Tim Rauch (Nextron Systems), Elastic (idea)date 2022-09-27
01

description

What this is, in brief.

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)

02

tags

attack.persistenceattack.initial-accessattack.t1133
03

rule source (YAML)

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
04

detects techniques (1)

ATT&CK techniques this enables or maps to.

05

references

External citations — patches, advisories, analysis.