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Attack: Indicator Removal on Host: File Deletion

Adversaries may delete files left behind by the actions of their intrusion activity. Malware, tools, or other non-native files dropped or created on a system by an adversary (ex: Ingress Tool Transfer) may leave traces to indicate to what was done within a network and how. Removal of these files can occur during an intrusion, or as part of a post-intrusion process to minimize the adversary’s footprint.

There are tools available from the host operating system to perform cleanup, but adversaries may use other tools as well.(Citation: Microsoft SDelete July 2016) Examples of built-in Command and Scripting Interpreter functions include del on Windows and rm or unlink on Linux and macOS.

MITRE

Tactic

technique

Test : Delete Prefetch File

OS

Description:

Delete a single prefetch file. Deletion of prefetch files is a known anti-forensic technique. To verify execution, Run (Get-ChildItem -Path "$Env:SystemRoot\prefetch\*.pf" | Measure-Object).Count before and after the test to verify that the number of prefetch files decreases by 1.

Executor

powershell

Sigma Rule

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