Detection rules › Sigma
Invoke-Obfuscation COMPRESS OBFUSCATION - PowerShell Module
Detects Obfuscated Powershell via COMPRESS OBFUSCATION
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Execution | T1059.001 Command and Scripting Interpreter: PowerShell |
| Defense Evasion | T1027 Obfuscated Files or Information |
Event coverage
| Provider | Event ID | Title |
|---|---|---|
| PowerShell | 4103 | Payload Context: ContextInfo User Data: UserData. |
Stages and Predicates
Stage 1: selection_4103
or:
Payload|contains: 'system.io.compression.deflatestream'
Payload|contains: system.io.streamreader
Payload|endswith: readtoend
Payload|contains: new-object
Payload|contains: 'text.encoding]::ascii'
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.
| Field | Kind | Values |
|---|---|---|
Payload | ends_with |
|
Payload | match |
|