PowerShell Profile Modification

Severity: medium
Author: HieuTT35, Nasreddine Bencherchali (Nextron Systems)
Source: upstream

Detects the creation or modification of a powershell profile which could indicate suspicious activity as the profile can be used as a mean of persistence

MITRE ATT&CK coverage

Tactic	Techniques
Persistence	`T1546.013` Event Triggered Execution: PowerShell Profile
Privilege Escalation	`T1546.013` Event Triggered Execution: PowerShell Profile

Event coverage

Provider	Event ID	Title
Sysmon	11	FileCreate

Stages and Predicates

Stage 1: `selection`

or:
TargetFilename|endswith: '\Microsoft.PowerShell_profile.ps1'
TargetFilename|endswith: '\PowerShell\profile.ps1'
TargetFilename|endswith: '\Program Files\PowerShell\7-preview\profile.ps1'
TargetFilename|endswith: '\Program Files\PowerShell\7\profile.ps1'
TargetFilename|endswith: '\WindowsPowerShell\profile.ps1'
TargetFilename|endswith: '\Windows\System32\WindowsPowerShell\v1.0\profile.ps1'

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.