Is kbdru_zh.zip safe?
No antivirus engine detected the long-established archive, and its completed sandbox run produced ordinary MSI installation activity without a malicious assessment.
All 74 antivirus engines avoided flagging this archive, including 17 reporting tier-1 engines. One completed sandbox run showed MSI installation activity and produced no malicious assessment, although two potentially offensive techniques and ten children without conclusive verdicts warrant normal caution.
f9ccdc403f07342e6e…b559f9dc5df956Recommended next actions
Before opening or extracting
Open or extract it only when its sender or download source has been independently verified.
If you already opened or extracted it
Keep normal device protection enabled and stop if the file behaves unexpectedly.
Intelligence
The saved assessment, checked against the scan evidence and recorded coverage.
The reasoning behind this verdict
This section explains the evidence supporting the verdict and keeps conflicting or missing signals visible.
All 74 antivirus engines avoided flagging this archive, including 17 reporting tier-1 engines. One completed sandbox run showed MSI installation activity and produced no malicious assessment, although two potentially offensive techniques and ten children without conclusive verdicts warrant normal caution.
The archive received zero malicious or suspicious detections among 74 antivirus engines, with all 17 reporting tier-1 engines remaining silent. It has also circulated for more than ten years and has been submitted 56 times by 48 sources, reducing concern that it is an unseen new sample. The completed sandbox run launched an MSI package and recorded installer-related filesystem and registry changes without producing a malicious assessment. T1543.003 and T1562.001 are risk-relevant observations, but they lack corroboration from detections, persistence indicators, malicious children, or external research rules. The ten extracted children have inconclusive individual verdicts, and no complete host-reputation check is available, so ordinary source verification remains appropriate.
What We Detected
No malicious or suspicious result was reported among 74 antivirus engines. All 17 reporting tier-1 engines, including Avast, BitDefender, ESET-NOD32, Kaspersky, and Microsoft, returned undetected results. The archive is more than ten years old and has appeared in 56 submissions from 48 sources.
Threat Behavior
One completed sandbox run extracted and launched an MSI package, producing filesystem and registry changes consistent with software or keyboard-layout installation. The run recorded T1543.003 and T1562.001, which deserve attention because they can be associated with persistence and defense impairment, but it produced no malicious sandbox assessment or persistence indicators. Ten extracted children were inspected without any malicious child finding, though their individual verdicts remain unknown. No network contacts were recorded during the run; however, contactedHosts is unavailable, so no complete host-reputation result exists.
What To Do Now
Obtain the archive from its expected vendor or trusted distribution channel and confirm its SHA-256 is f9ccdc403f07342e6e250b17306f4a0380e8f50f5ec80438b8b559f9dc5df956 before installation. Keep endpoint protection enabled and avoid opening it if the source or intended keyboard-layout package is unexpected.
Where this verdict could be wrong3 caveats
- behaviour.offensiveTechniques lists T1543.003 and T1562.001, which can indicate service persistence or impaired defenses, but neither is corroborated by engine detections or a malicious sandbox assessment.
- droppedChildren.rollup.unknown=10 means the extracted components were not affirmatively established as benign.
- contactedHosts=null, so no complete host-reputation cross-check is available.
These are the assessment's weak points. If you believe one applies to your file, report the verdict and we'll re-review it.
- 0/74 engines reported malicious or suspicious findings.
- engines.tier1ReportedClean=17 with engines.tier1Malicious=0.
- behaviour.hasMaliciousSandboxVerdict=false in one completed run.
- droppedChildren.hasMaliciousChild=false across 10 inspected children.
- externalIntel.yaraify.ruleCount=0 and externalIntel.malwareBazaar.hit=false.
- behaviour.offensiveTechniques includes T1543.003 and T1562.001.
- droppedChildren.rollup.unknown=10 leaves extracted components without conclusive individual verdicts.
- contactedHosts=null means host-reputation coverage is unavailable.
- The ZIP contains executable MSI content and therefore can install system components.
Use the archive only if it came from the expected trusted source and the SHA-256 matches. Keep endpoint protection enabled, particularly because the package installs executable MSI content.
Coverage & freshness
Complete means the check returned a usable result. It does not mean the file is safe.
Antivirus
Complete0 of 74 engines flagged the file.
Sandbox
Complete1 isolated runtime environment contributed observations.
Network
Not runNo contacted-host reputation check is recorded.
No timestamp recordedYARA
CompleteRule evaluation completed with no recorded matches.
External intel
Complete3 of 3 independent reference sources completed.
Behavior
Plain-English impact first, then the observed runtime evidence.
Runtime flight recorder
Capture complete- 1isolated sandbox run
- 15MITRE ATT&CK techniques
- 7spawned processes
- 0network contacts
- 36filesystem & mutex artifacts
What this file did when executed
This file was detonated in 1 sandbox and its runtime behaviour was observed.
Adversary techniques mapped to the MITRE ATT&CK framework.
- HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1-5-21-1015118539-3749460369-599379286-1001\Products\BDF0C3EDCCB689D49A8229A3074A6107\Usage
- HKEY_CURRENT_USER\Software\Microsoft\Installer\Products\BDF0C3EDCCB689D49A8229A3074A6107\SourceList\Net\1
- HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1-5-21-1015118539-3749460369-599379286-1001\Products\BDF0C3EDCCB689D49A8229A3074A6107\InstallProperties\DisplayName
- HKEY_CURRENT_USER\Software\Microsoft\Installer\Products\BDF0C3EDCCB689D49A8229A3074A6107\SourceList\Media\1
- HKEY_CURRENT_USER\Software\Microsoft\CTF\SortOrder\Language
- HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Keyboard Layouts\a0000419
- C:\Config.Msi
- C:\Config.Msi\5d8bb2.rbs
- C:\Config.Msi\MSI9101.tmp
- C:\Config.Msi\MSI946F.tmp
- C:\MSId8ae6.tmp
- C:\Config.Msi
- C:\Config.Msi\5d8bb2.rbs
- C:\Config.Msi\MSI9101.tmp
- C:\Config.Msi\MSI946F.tmp
- C:\MSId8ae6.tmp
- Global\_MSISETUP_{2956EBA1-9B5A-4679-8618-357136DA66CA}
- Global\_MSIExecute
- \Sessions\1\BaseNamedObjects\Global\SyncRootManager
- \Sessions\1\BaseNamedObjects\Local\ZonesCacheCounterMutex
- \Sessions\1\BaseNamedObjects\Local\ZonesLockedCacheCounterMutex
Files this sample writes at runtime
This file drops 10 children at runtime. None are currently flagged malicious in our cache.
- 7b59402f044392214997…db304aNever scannednever seen before
- 666c967344c4482287db…c7fee2Never scannednever seen before
- 3f272c1cc49c1bda40d4…97a51aNever scannednever seen before
- f19a4d5d4323dbf74a0b…575124Never scannednever seen before
- 3df18aa1979d103ac179…3f227eNever scannednever seen before
- 41e6f35471828ab8a507…4ec614Never scannednever seen before
- de743621201fc1d01a64…671b46Never scannednever seen before
- 7c39fa8383dce7ca41b3…44647eNever scannednever seen before
- 079967dd1561b8d439d5…0550adNever scannednever seen before
- 3f5165139c3e9cb5e4d6…50ccebNever scannednever seen before
Detection & Forensics
Consensus, attribution, signatures, code structure, prevalence, and identity.
Evidence integrity
Chain of custody for the facts preserved in this report.
- 0rule hits recorded
- 0 / 74engines flagged
- 48sources in submission history
Why these facts are shown
Each statement identifies whether it was directly recorded or derived from saved scan facts.
- 01
0 of 74 antivirus engines flagged the file.
Verdict inputView chapterProvenanceObservedSourceAntivirus analysisObserved at - 02
The hash has been submitted 56 times from 48 sources.
ProvenanceDerivedSourceSaved report factsObserved at - 03
Scanned file: kbdru_zh.zip — f9ccdc403f07342e6e250b17306f4a0380e8f50f5ec80438b8b559f9dc5df956
ProvenanceObservedSourceUploaded fileObserved at - 04
Observed process — C:\Windows\SysWOW64\unarchiver.exe" "C:\Users\user\Desktop\download.zip
ProvenanceObservedSourceIsolated runtime analysisObserved at - 05
Observed process — C:\Windows\SysWOW64\7za.exe C:\Windows\System32\7za.exe" x -pinfected -y -o"C:\Users\user\AppData\Local\Temp\vwmiahyp.uk2" "C:\Users\user\Desktop\download.zip
ProvenanceObservedSourceIsolated runtime analysisObserved at - 06
File written: Config.Msi — C:\Config.Msi
ProvenanceObservedSourceIsolated runtime analysisObserved at - 07
File written: 5d8bb2.rbs — C:\Config.Msi\5d8bb2.rbs
ProvenanceObservedSourceIsolated runtime analysisObserved at
Detection sources at a glance
The available sources did not agree on a named threat category.
MalwareBazaar, YARAify, and CIRCL hashlookup completed and returned no entries for this hash.
YARA rules
No matchesThe rule pass completed without a saved public match.
0 of 74 engines flagged this file
View all 74 engine results
PE structure
Not applicablePE structure analysis applies to Windows executable formats, not this file type.
How widely this file has been seen
Moderate prevalence — neither rare nor common. No strong prior applies.
Fingerprint and provenance
- File name
- kbdru_zh.zip
- Format
- ZIP
- Code signing
- Not applicable to this file type
- Size
- 298.0 KB
- Last analyzed
- Oct 5, 2026, 12:56 PM UTC
f9ccdc403f07342e6e250b17306f4a0380e8f50f5ec80438b8b559f9dc5df956Safety & FAQ
Complete recovery guidance and answers for the next decision.
What to do now
This file appears low risk based on the evidence available now.
- Recovery step 01
Open or extract it only when its sender or download source has been independently verified.
- Recovery step 02
A clean result reduces known risk, but it cannot guarantee that every new or targeted threat has been detected.
- Recovery step 03
Keep your antivirus and Windows updates switched on so you stay protected.
Safety FAQ
Direct answers grounded in the saved verdict and evidence in this report.
Is kbdru_zh.zip safe?
What is kbdru_zh.zip?
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What is the SHA-256 hash of kbdru_zh.zip?
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Community
Member reviews and reports for this exact file hash.