Detection rules › Sigma

Potential Persistence Via Event Viewer Events.asp

Severity
medium
Author
Nasreddine Bencherchali (Nextron Systems)
Source
upstream

Detects potential registry persistence technique using the Event Viewer "Events.asp" technique

MITRE ATT&CK coverage

TacticTechniques
PersistenceT1112 Modify Registry
Defense EvasionT1112 Modify Registry

Event coverage

ProviderEvent IDTitle
Sysmon13RegistryEvent (Value Set)

Stages and Predicates

Stage 1: selection

or:
TargetObject|contains: '\Microsoft\Windows NT\CurrentVersion\Event Viewer\MicrosoftRedirectionProgram'
TargetObject|contains: '\Microsoft\Windows NT\CurrentVersion\Event Viewer\MicrosoftRedirectionURL'

Stage 2: not 1 of filter_*

or:
Details: '%%SystemRoot%%\PCHealth\HelpCtr\Binaries\HelpCtr.exe'
Image|endswith: 'C:\WINDOWS\system32\svchost.exe'
TargetObject|endswith: '\Microsoft\Windows NT\CurrentVersion\Event Viewer\MicrosoftRedirectionProgram'
Details: '-url hcp://services/centers/support?topic=%%s'
Image|endswith: 'C:\WINDOWS\system32\svchost.exe'
TargetObject|endswith: '\Microsoft\Windows NT\CurrentVersion\Event Viewer\MicrosoftRedirectionProgramCommandLineParameters'
Details: '(Empty)'
Details: 'http://go.microsoft.com/fwlink/events.asp'

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.

FieldKindValues
Detailseq
  • %%SystemRoot%%\PCHealth\HelpCtr\Binaries\HelpCtr.exe
  • (Empty) corpus 24 (sigma 24)
  • http://go.microsoft.com/fwlink/events.asp
Detailswildcard
  • -url hcp://services/centers/support?topic=%%s
Imageends_with
  • C:\WINDOWS\system32\svchost.exe
TargetObjectends_with
  • \Microsoft\Windows NT\CurrentVersion\Event Viewer\MicrosoftRedirectionProgram
  • \Microsoft\Windows NT\CurrentVersion\Event Viewer\MicrosoftRedirectionProgramCommandLineParameters
TargetObjectmatch
  • \Microsoft\Windows NT\CurrentVersion\Event Viewer\MicrosoftRedirectionProgram
  • \Microsoft\Windows NT\CurrentVersion\Event Viewer\MicrosoftRedirectionURL