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Detectionhightest

SafeBoot Registry Key Deleted Via Reg.EXE

Detects execution of "reg.exe" commands with the "delete" flag on safe boot registry keys. Often used by attacker to prevent safeboot execution of security products

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Launch
Nasreddine Bencherchali (Nextron Systems), Tim SheltonCreated Mon Aug 08Updated Sat Feb 04fc0e89b5-adb0-43c1-b749-c12a10ec37dewindows
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:
    selection_img:
        - Image|endswith: 'reg.exe'
        - OriginalFileName: 'reg.exe'
    selection_delete:
        CommandLine|contains|all:
            - ' delete '
            - '\SYSTEM\CurrentControlSet\Control\SafeBoot'
    condition: all of selection_*
False Positives
Unlikely

False positives are unlikely for most environments. High confidence detection.

References
1
Resolving title…
trendmicro.com
MITRE ATT&CK
Related Rules
SimilarDetectionhigh

Add SafeBoot Keys Via Reg Utility

Detects execution of "reg.exe" commands with the "add" or "copy" flags on safe boot registry keys. Often used by attacker to allow the ransomware to work in safe mode as some security products do not

Detects similar activity. Both rules may fire on overlapping events.

Rule Metadata
Rule ID
fc0e89b5-adb0-43c1-b749-c12a10ec37de
Status
test
Level
high
Type
Detection
Created
Mon Aug 08
Modified
Sat Feb 04
Author
Nasreddine Bencherchali (Nextron Systems), Tim Shelton
Path
rules/windows/process_creation/proc_creation_win_reg_delete_safeboot.yml
Raw Tags
attack.defense-evasionattack.t1562.001
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