Library / Sysinternals
ru64.exe
Registry size usage reporter · Sysinternals - www.sysinternals.com
SysinternalsSysmon-confirmedSigma refs: 1
OriginalFilename
Regsize1
Differs from file nameShared with other binaries
Gotchas
- OriginalFilename doesn't match the file name: a rule using
OriginalFileName: ru64.exenever fires. - Same OriginalFilename as
ru.exe, so OriginalFilename alone can't tell them apart.
Query snippets
logsource:
category: process_creation
product: windows
detection:
selection:
- Image|endswith: '\ru64.exe'
- OriginalFileName: 'Regsize1'
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="Regsize1" OR Processes.process_name="ru64.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~ ("Regsize1")
or FileName =~ "ru64.exe"Microsoft Defender XDR advanced hunting. in~ and =~ are case-insensitive.
process where event.type == "start" and
(process.pe.original_file_name in~ ("Regsize1") or
process.name : "ru64.exe")ECS process.pe.original_file_name is a keyword field: in~ is case-insensitive, Kibana KQL is not.
['regsize1'].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 |
|---|---|---|---|---|---|---|
| Regsize1 | 1 | x64 | 1.20.0.0 | Sysinternals | ✓ 1 |
All 1 parsed builds
| SHA256 | Version | Arch | OriginalFilename | Windows releases | Signature | Source | Sysmon |
|---|---|---|---|---|---|---|---|
| c48a4859ac61… | 1.20.0.0 | x64 | Regsize1 | Sysinternals Ru | Sysinternals | ✓ |
Winbindex builds link to the Microsoft symbol server copy that was hashed and parsed.