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Detection rules › Sigma

Zip A Folder With PowerShell For Staging In Temp - PowerShell Script

Severity
medium
Author
Nasreddine Bencherchali (Nextron Systems), frack113
Source
upstream

Detects PowerShell scripts that make use of the "Compress-Archive" Cmdlet in order to compress folders and files where the output is stored in a potentially suspicious location that is used often by malware for exfiltration. An adversary might compress data (e.g., sensitive documents) that is collected prior to exfiltration in order to make it portable and minimize the amount of data sent over the network.

MITRE ATT&CK coverage

TacticTechniques
CollectionT1074.001 Data Staged: Local Data Staging

Event coverage

ProviderEvent IDTitle
PowerShell4104Creating Scriptblock text (MessageNumber of MessageTotal).

Stages and Predicates

Stage 1: selection

or:
ScriptBlockText|contains: 'Compress-Archive -Path*-DestinationPath $env:TEMP'
ScriptBlockText|contains: 'Compress-Archive -Path*-DestinationPath*:\Windows\Temp\'
ScriptBlockText|contains: 'Compress-Archive -Path*-DestinationPath*\AppData\Local\Temp\'

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
ScriptBlockTextmatch
  • Compress-Archive -Path*-DestinationPath $env:TEMP
  • Compress-Archive -Path*-DestinationPath*:\Windows\Temp\
  • Compress-Archive -Path*-DestinationPath*\AppData\Local\Temp\

Neighbors

Broader alternatives (more inclusive than this rule)

These rules match a superset of what this rule catches. They cover the same events plus more. Use them if you want wider coverage and can absorb more false positives.