Library / Sysinternals
regdelnull.exe
Delete Registry keys with embedded Nulls · Sysinternals - www.sysinternals.com
SysinternalsSysmon-confirmedSigma refs: 1
OriginalFilename
RegDelNull.exe
Shared with other binaries
Gotchas
- Same OriginalFilename as
regdelnull64.exe, so OriginalFilename alone can't tell them apart.
Query snippets
logsource:
category: process_creation
product: windows
detection:
selection:
- Image|endswith: '\regdelnull.exe'
- OriginalFileName: 'RegDelNull.exe'
condition: selectionprocess_creation logsource. Sigma string matching is case-insensitive.
| tstats summariesonly=false count values(Processes.original_file_name) as original_file_name
from datamodel=Endpoint.Processes
where (Processes.original_file_name="RegDelNull.exe" OR Processes.process_name="regdelnull.exe")
by Processes.dest Processes.process_name Processes.process_path Processes.process
| rename Processes.* as *Endpoint.Processes data model. On raw Sysmon events the field is OriginalFileName.
DeviceProcessEvents
| where ProcessVersionInfoOriginalFileName in~ ("RegDelNull.exe")
or FileName =~ "regdelnull.exe"Microsoft Defender XDR advanced hunting. in~ and =~ are case-insensitive.
process where event.type == "start" and
(process.pe.original_file_name in~ ("RegDelNull.exe") or
process.name : "regdelnull.exe")ECS process.pe.original_file_name is a keyword field: in~ is case-insensitive, Kibana KQL is not.
['regdelnull.exe'].includes(String(OriginalFileName || '').toLowerCase())Filter expression (JavaScript) for events carrying Sysmon's OriginalFileName field.
Values across builds
| OriginalFilename | Builds | Arch | File version | Windows releases | Source | Sysmon |
|---|---|---|---|---|---|---|
| RegDelNull.exe | 1 | x86 | 1.11.0.0 | Sysinternals | ✓ 1 |
All 1 parsed builds
| SHA256 | Version | Arch | OriginalFilename | Windows releases | Signature | Source | Sysmon |
|---|---|---|---|---|---|---|---|
| e39da31d87c4… | 1.11.0.0 | x86 | RegDelNull.exe | Sysinternals RegDelNull | Sysinternals | ✓ |
Winbindex builds link to the Microsoft symbol server copy that was hashed and parsed.