Detectionmediumtest
Invoke-Obfuscation COMPRESS OBFUSCATION - Security
Detects Obfuscated Powershell via COMPRESS OBFUSCATION
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Timur Zinniatullin, oscd.communityCreated Sun Oct 18Updated Tue Nov 297a922f1b-2635-4d6c-91ef-af228b198ad3windows
Log Source
Windowssecurity
ProductWindows← raw: windows
Servicesecurity← raw: security
Definition
The 'System Security Extension' audit subcategory need to be enabled to log the EID 4697
Detection Logic
Detection Logic1 selector
detection:
selection:
EventID: 4697
ServiceFileName|contains|all:
- 'new-object'
- 'text.encoding]::ascii'
- 'readtoend'
ServiceFileName|contains:
- 'system.io.compression.deflatestream'
- 'system.io.streamreader'
condition: selectionFalse Positives
Unknown
False positive likelihood has not been assessed. Additional context may be needed during triage.
References
MITRE ATT&CK
Techniques
Sub-techniques
Rule Metadata
Rule ID
7a922f1b-2635-4d6c-91ef-af228b198ad3
Status
test
Level
medium
Type
Detection
Created
Sun Oct 18
Modified
Tue Nov 29
Author
Path
rules/windows/builtin/security/win_security_invoke_obfuscation_via_compress_services_security.yml
Raw Tags
attack.defense-evasionattack.t1027attack.executionattack.t1059.001