Is NemuDownloader.exe safe?
Only 2 of 74 engines applied riskware or adware labels, while verified NetEase signing, tier-1 silence, and observed behavior support a benign downloader.
The executable is verified as signed by Netease Interactive Entertainment Pte. Ltd., and none of 17 reporting tier-1 engines detected it. One sandbox found no offensive behavior or malicious verdict, while the two detections appear limited to riskware/adware classifications; however, the directly contacted IP was not reputation-checked.
7d5bb378611c13501a…a4b627c6df0670Recommended next actions
Before running
Run it only when it came from the developer's official site or another source you independently trust.
If you already ran 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.
The executable is verified as signed by Netease Interactive Entertainment Pte. Ltd., and none of 17 reporting tier-1 engines detected it. One sandbox found no offensive behavior or malicious verdict, while the two detections appear limited to riskware/adware classifications; however, the directly contacted IP was not reputation-checked.
Only 2 of 74 engines flagged the sample, and neither detection came from a tier-1 engine. Both labels describe riskware or adware, with no family consensus or confirmed hacktool classification. The verified NetEase signature, absence of brand conflict, and a signer-matched prior sample support a legitimate downloader. One completed sandbox run found no offensive techniques or malicious verdict, and no inspected child was identified as malicious. A direct connection to 34.36.47.246 remains a limitation because a complete host-reputation cross-check is unavailable.
What We Detected
Two of 74 antivirus engines flagged the executable: NANO-Antivirus called it Riskware.Win32.Fragtor.ljrxgl, while VBA32 used the adware label Packunwan. None of the 17 reporting tier-1 engines detected it, and there was no agreed malware family.
Threat Behavior
One sandbox run recorded nine installer-common or ambient techniques but no offensive techniques and no malicious sandbox verdict. Ten dropped files were inspected without a malicious child finding, although their individual verdicts remain unknown. The sample contacted 8.8.8.8 and 34.36.47.246; no complete host-reputation result is available for those contacts.
What To Do Now
Prefer a download obtained directly from the publisher's official release channel and confirm that Windows still shows the verified Netease Interactive Entertainment Pte. Ltd. signature. Keep endpoint protection enabled, and avoid the file if its source or signature differs.
Where this verdict could be wrong4 caveats
- NANO-Antivirus and VBA32 applied riskware/adware labels, so potentially unwanted bundling or promotional behavior cannot be fully excluded.
- The sandbox contacted 34.36.47.246 directly, and contactedHosts=null means no complete host-reputation result is available.
- signing.signerStats covers only 1 historical sample and autoTrusted=false, so publisher history is supportive but not yet well established.
- All 10 dropped children have unknown individual verdicts despite droppedChildren.hasMaliciousChild=false.
These are the assessment's weak points. If you believe one applies to your file, report the verdict and we'll re-review it.
- All 17 reporting tier-1 engines were clean.
- Verified signature from Netease Interactive Entertainment Pte. Ltd.
- brandMismatch=null.
- No offensive sandbox techniques or malicious sandbox verdict.
- One signer-matched imphash predecessor received a score of 90 with ai:benign_signed_installer.
- 2/74 engines applied riskware or adware labels.
- Direct IP contact to 34.36.47.246 lacks a completed reputation cross-check.
- Publisher history contains only 1 prior sample and signing.signerStats.autoTrusted=false.
- Ten dropped children have unknown individual verdicts.
Use only a copy obtained from the publisher's official channel and verify the NetEase signature before running it. Keep endpoint protection enabled and rescan if the file changes.
Coverage & freshness
Complete means the check returned a usable result. It does not mean the file is safe.
Antivirus
Complete2 of 74 engines flagged the file.
Sandbox
Complete1 isolated runtime environment contributed observations.
Network
Partial2 runtime contacts were observed without a completed reputation cross-check.
YARA
Complete1 signature or behavior rule matched.
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
- 9MITRE ATT&CK techniques
- 3spawned processes
- 2network contacts
- 17filesystem & mutex artifacts
Attack story
Runtime observations grouped by analysis stage. Arrows organize the stages; they do not claim chronology or causality.
Input file
The submitted object
- FileObserved
NemuDownloader.exe
7d5bb378611c13501a2fb7f829e52dc5c497928e400f7eb5f9a4b627c6df0670
01Uploaded file
Processes
Runtime execution
- ProcessObserved
Observed process
C:\Users\<USER>\AppData\Local\Temp\7z385DC9F8\nemu-downloader.exe
02Isolated runtime analysis - ProcessObserved
Observed process
C:\Users\<USER>\AppData\Local\Temp\7z385DC9F8\crashpad_handler.exe --no-rate-limit --database=C:\Users\<USER>\AppData\Local\NemuServer\.sentry-native --metrics-dir=C:\Users\<USER>\AppData\Local\NemuServer\.sentry-native --url=https://sentry.netease.com:443/api/325/minidump/?sentry_client=sentry.native/0.5.0&sentry_key=d7282c50f1b64296835edf7d19667322 --attachment=C:\Users\<USER>\AppData\Local\NemuServer\.sentry-native\807d8d23-351d-4021-943d-65c99d91a821.run\__sentry-event --attachment=C:\Users\<USER>\AppData\Local\NemuServer\.sentry-native\807d8d23-351d-4021-943d-65c99d91a821.run\__sentry-breadcrumb1 --attachment=C:\Users\<USER>\AppData\Local\NemuServer\.sentry-native\807d8d23-351d-4021-943d-65c99d91a821.run\__sentry-breadcrumb2 --initial-client-data=0x254,0x258,0x25c,0x228,0x260,0x72554800,0x72554818,0x72554828
03Isolated runtime analysis - +1 more recorded observation in Analyst mode
Files
Created or changed
- Written fileObserved
config.ini
C:\Users\<USER>\AppData\Local\Temp\7z385DC9F8\config.ini
04Isolated runtime analysis - Written fileObserved
skin.zip
C:\Users\<USER>\AppData\Local\Temp\7z385DC9F8\skin.zip
05Isolated runtime analysis - +1 more recorded observation in Analyst mode
Network
Hosts contacted
- Contacted hostObserved
8.8.8.8
Contact observed during runtime.
06Isolated runtime analysis - Contacted hostObserved
34.36.47.246
Contact observed during runtime.
07Isolated runtime analysis - +1 more recorded observation in Analyst mode
7 recorded facts from one runtime window. Every fact remains independently traceable in Analyst mode.
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.
- 8.8.8.8
- 34.36.47.246
- C:\Users\<USER>\AppData\Local\Temp\7z385DC9F8\config.ini
- C:\Users\<USER>\AppData\Local\Temp\7z385DC9F8\skin.zip
- C:\Users\<USER>\AppData\Local\Temp\7z385DC9F8\nemu-downloader.exe
- C:\Users\<USER>\AppData\Local\Temp\7z385DC9F8\MuMuDownloader.exe
- C:\Users\<USER>\AppData\Local\Temp\7z385DC9F8\msvcp_win.dll
- C:\Users\<USER>\AppData\Local\NemuServer\.sentry-native\807d8d23-351d-4021-943d-65c99d91a821.run\session.json
- nemu-downloader-run-mutex
Files this sample writes at runtime
This file drops 10 children at runtime. None are currently flagged malicious in our cache.
- d8df592799f36eb63546…a6854eNever scannednever seen before
- aa40840b724a3c1e1d2d…454c10Never scannednever seen before
- fcdc71d87b45e68563c3…3d05faNever scannednever seen before
- 7b3463c16416c93d9b8b…658a3cNever scannednever seen before
- d56c631b0f4f70bdeebc…d22399Never scannednever seen before
- da48178bbdd98fa8906b…09fcdaNever scannednever seen before
- 6ee46c6b6727eb77bcbc…58844eNever scannednever seen before
- dcb9cf7e31d6772434c6…88294cNever scannednever seen before
- b15964d49a2c5219e092…4e401fNever scannednever seen before
- 582e87ade6dac2588441…74c74bNever 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.
- 1rule hit recorded
- 2 / 74engines flagged
- 332sources in submission history
Why these facts are shown
Each statement identifies whether it was directly recorded or derived from saved scan facts.
- 01
The file has a valid code signature from Netease Interactive Entertainment Pte. Ltd..
ProvenanceObservedSourceCode-signing metadataObserved at - 02
2 of 74 antivirus engines flagged the file, including NANO-Antivirus and VBA32.
Verdict inputView chapterProvenanceObservedSourceAntivirus analysisObserved at - 03
The hash has been submitted 361 times from 332 sources.
ProvenanceDerivedSourceSaved report factsObserved at - 04
Scanned file: NemuDownloader.exe — 7d5bb378611c13501a2fb7f829e52dc5c497928e400f7eb5f9a4b627c6df0670
ProvenanceObservedSourceUploaded fileObserved at - 05
Observed process — C:\Users\<USER>\AppData\Local\Temp\7z385DC9F8\nemu-downloader.exe
ProvenanceObservedSourceIsolated runtime analysisObserved at - 06
Observed process — C:\Users\<USER>\AppData\Local\Temp\7z385DC9F8\crashpad_handler.exe --no-rate-limit --database=C:\Users\<USER>\AppData\Local\NemuServer\.sentry-native --metrics-dir=C:\Users\<USER>\AppData\Local\NemuServer\.sentry-native --url=https://sentry.netease.com:443/api/325/minidump/?sentry_client=sentry.native/0.5.0&sentry_key=d7282c50f1b64296835edf7d19667322 --attachment=C:\Users\<USER>\AppData\Local\NemuServer\.sentry-native\807d8d23-351d-4021-943d-65c99d91a821.run\__sentry-event --attachment=C:\Users\<USER>\AppData\Local\NemuServer\.sentry-native\807d8d23-351d-4021-943d-65c99d91a821.run\__sentry-breadcrumb1 --attachment=C:\Users\<USER>\AppData\Local\NemuServer\.sentry-native\807d8d23-351d-4021-943d-65c99d91a821.run\__sentry-breadcrumb2 --initial-client-data=0x254,0x258,0x25c,0x228,0x260,0x72554800,0x72554818,0x72554828
ProvenanceObservedSourceIsolated runtime analysisObserved at - 07
File written: config.ini — C:\Users\<USER>\AppData\Local\Temp\7z385DC9F8\config.ini
ProvenanceObservedSourceIsolated runtime analysisObserved at - 08
File written: skin.zip — C:\Users\<USER>\AppData\Local\Temp\7z385DC9F8\skin.zip
ProvenanceObservedSourceIsolated runtime analysisObserved at - 09
Contacted host: 8.8.8.8 — Contact observed during runtime.
ProvenanceObservedSourceIsolated runtime analysisObserved at - 10
Contacted host: 34.36.47.246 — Contact observed during runtime.
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.
Signatures and behavior heuristics
Low-severity pattern matches — worth noting but not on their own cause for alarm.
The sample contacted an external IP address directly and no application domain was recorded. Direct-IP traffic also occurs in legitimate installers and infrastructure, so this is supporting context only and requires corroboration from host reputation and other runtime evidence.
Evidence34.36.47.246
2 of 74 engines flagged this file
View all 74 engine results
Section entropy & packers
No high-entropy executable section or known packer signature was detected. Data and resource sections can still have high entropy without indicating packed code.
How widely this file has been seen
Moderate prevalence — neither rare nor common. No strong prior applies.
Fingerprint and provenance
- File name
- NemuDownloader.exe
- Format
- Win32 EXE
- Code signing
- Signature valid: Netease Interactive Entertainment Pte. Ltd.
- Size
- 5.8 MB
- Last analyzed
- Sep 18, 2026, 6:57 PM UTC
7d5bb378611c13501a2fb7f829e52dc5c497928e400f7eb5f9a4b627c6df0670Safety & 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
Run it only when it came from the developer's official site or another source you independently trust.
- 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 NemuDownloader.exe safe?
What is NemuDownloader.exe?
How many antivirus engines detected NemuDownloader.exe?
Is NemuDownloader.exe digitally signed?
What is the SHA-256 hash of NemuDownloader.exe?
Is it safe to run NemuDownloader.exe?
How up to date is this analysis of NemuDownloader.exe?
Community
Member reviews and reports for this exact file hash.