Detection rules › Sigma
Potential Persistence Via Event Viewer Events.asp
Detects potential registry persistence technique using the Event Viewer "Events.asp" technique
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Persistence | |
| Defense Impairment |
Telemetry coverage
| Provider | Record / event type |
|---|---|
| Sysmon | Event ID 13: RegistryEvent (Value Set) |
Rule body
title: Potential Persistence Via Event Viewer Events.asp
id: a1e11042-a74a-46e6-b07c-c4ce8ecc239b
status: test
description: Detects potential registry persistence technique using the Event Viewer "Events.asp" technique
references:
- https://twitter.com/nas_bench/status/1626648985824788480
- https://admx.help/?Category=Windows_7_2008R2&Policy=Microsoft.Policies.InternetCommunicationManagement::EventViewer_DisableLinks
- https://www.hexacorn.com/blog/2019/02/15/beyond-good-ol-run-key-part-103/
- https://github.com/redcanaryco/atomic-red-team/blob/f296668303c29d3f4c07e42bdd2b28d8dd6625f9/atomics/T1112/T1112.md
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-02-17
modified: 2023-03-05
tags:
- attack.persistence
- attack.defense-impairment
- attack.t1112
logsource:
category: registry_set
product: windows
detection:
selection:
# Covers both "\Policies\" and "\Software\" paths for both "Machine" and "User" level configs
# Also "MicrosoftRedirectionProgramCommandLineParameters" key
TargetObject|contains:
- '\Microsoft\Windows NT\CurrentVersion\Event Viewer\MicrosoftRedirectionProgram'
- '\Microsoft\Windows NT\CurrentVersion\Event Viewer\MicrosoftRedirectionURL'
filter_default_redirect_program:
Image|endswith: 'C:\WINDOWS\system32\svchost.exe' # Set via GPO
TargetObject|endswith: '\Microsoft\Windows NT\CurrentVersion\Event Viewer\MicrosoftRedirectionProgram'
Details: '%%SystemRoot%%\PCHealth\HelpCtr\Binaries\HelpCtr.exe'
filter_default_redirect_program_cli:
Image|endswith: 'C:\WINDOWS\system32\svchost.exe' # Set via GPO
TargetObject|endswith: '\Microsoft\Windows NT\CurrentVersion\Event Viewer\MicrosoftRedirectionProgramCommandLineParameters'
Details: '-url hcp://services/centers/support?topic=%%s'
filter_url:
Details: 'http://go.microsoft.com/fwlink/events.asp'
filter_cleaner:
Details: '(Empty)'
condition: selection and not 1 of filter_*
falsepositives:
- Unknown
level: medium
Stages and Predicates
Stage 0: condition
selection and not 1 of filter_*Stage 1: selection
selection:
TargetObject|contains:
- '\Microsoft\Windows NT\CurrentVersion\Event Viewer\MicrosoftRedirectionProgram'
- '\Microsoft\Windows NT\CurrentVersion\Event Viewer\MicrosoftRedirectionURL'
Stage 2: not filter_*
filter_default_redirect_program:
Image|endswith: 'C:\WINDOWS\system32\svchost.exe'
TargetObject|endswith: '\Microsoft\Windows NT\CurrentVersion\Event Viewer\MicrosoftRedirectionProgram'
Details: '%%SystemRoot%%\PCHealth\HelpCtr\Binaries\HelpCtr.exe'
filter_default_redirect_program_cli:
Image|endswith: 'C:\WINDOWS\system32\svchost.exe'
TargetObject|endswith: '\Microsoft\Windows NT\CurrentVersion\Event Viewer\MicrosoftRedirectionProgramCommandLineParameters'
Details: '-url hcp://services/centers/support?topic=%%s'
filter_url:
Details: 'http://go.microsoft.com/fwlink/events.asp'
filter_cleaner:
Details: '(Empty)'
Exclusions
The rule actively suppresses these predicates.
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
TargetObject | match |
| field:"TargetObject" kind:match |