Detectionhightest
Suspicious Rundll32 Activity Invoking Sys File
Detects suspicious process related to rundll32 based on command line that includes a *.sys file as seen being used by UNC2452
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Florian Roth (Nextron Systems)Created Fri Mar 05Updated Sun Oct 09731231b9-0b5d-4219-94dd-abb6959aa7eawindows
Log Source
WindowsProcess Creation
ProductWindows← raw: windows
CategoryProcess Creation← raw: process_creation
Events generated when a new process is spawned on the system. Covers command-line arguments, parent/child relationships, and process metadata.
Detection Logic
Detection Logic2 selectors
detection:
selection1:
CommandLine|contains: 'rundll32.exe'
selection2:
CommandLine|contains:
- '.sys,'
- '.sys '
condition: all of selection*False Positives
Unknown
False positive likelihood has not been assessed. Additional context may be needed during triage.
References
MITRE ATT&CK
Tactics
Sub-techniques
Rule Metadata
Rule ID
731231b9-0b5d-4219-94dd-abb6959aa7ea
Status
test
Level
high
Type
Detection
Created
Fri Mar 05
Modified
Sun Oct 09
Path
rules/windows/process_creation/proc_creation_win_rundll32_sys.yml
Raw Tags
attack.defense-evasionattack.t1218.011