Import PowerShell Modules From Suspicious Directories - ProcCreation

Severity: medium
Author: Nasreddine Bencherchali (Nextron Systems)
Source: upstream

Detects powershell scripts that import modules from suspicious directories

MITRE ATT&CK coverage

Tactic	Techniques
Execution	`T1059.001` Command and Scripting Interpreter: PowerShell

Event coverage

Provider	Event ID	Title
Sysmon	1	Process creation
Security-Auditing	4688	A new process has been created.

Stages and Predicates

Stage 1: `selection`

or:
CommandLine|contains: 'Import-Module $Env:Appdata\'
CommandLine|contains: 'Import-Module $Env:Temp\'
CommandLine|contains: 'Import-Module ''$Env:Appdata\'
CommandLine|contains: 'Import-Module ''$Env:Temp\'
CommandLine|contains: 'Import-Module C:\Users\Public\'
CommandLine|contains: 'Import-Module "$Env:Appdata\'
CommandLine|contains: 'Import-Module "$Env:Temp\'
CommandLine|contains: 'ipmo $Env:Appdata\'
CommandLine|contains: 'ipmo $Env:Temp\'
CommandLine|contains: 'ipmo ''$Env:Appdata\'
CommandLine|contains: 'ipmo ''$Env:Temp\'
CommandLine|contains: 'ipmo C:\Users\Public\'
CommandLine|contains: 'ipmo "$Env:Appdata\'
CommandLine|contains: 'ipmo "$Env: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.