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Verdict Malicious

Analyzed , 1 month ago

Is AppvIsvSubsystems32.dll safe? No, we rate this exact file malicious.

Seventeen of the 70 antivirus engines that checked it flagged this new unsigned DLL, with multiple major detections and repeated Yogi naming outweighing inconclusive sandbox…

Read the whole reasonShow less

Strong evidence · Two or more major antivirus engines agree.

Don't use this component

If you already used it, follow the steps below.

What to do now4 steps

This file is harmful. Don't run it, and remove it.

If you haven't used it

  1. Don't use this component. Let your antivirus remove this component, then repair or reinstall the program it belongs to from its official website. Don't delete or replace the file by hand.

If you already used it

  1. Disconnect the device from the internet, then run a full antivirus scan. Microsoft Defender Offline (Windows Security > Virus & threat protection > Scan options) also finds malware that hides while Windows runs.

  2. If you typed passwords on the device after running it, change them from another device you trust.

  3. If the scan keeps finding it, or the device still acts strangely, scan again with a second-opinion scanner from another company; if that doesn't fix it, back up your personal files and reinstall Windows.

If you already ran it, do these in order.

If you opened or installed it

Avoid banking and sign-ins on that device until it is clean. These free MalwareTips guides walk you through it.

Paste this report's link in your topic so helpers can see what was found.

Why we think so

Share this file report

AppvIsvSubsystems32.dll: Malicious — MalwareTips file scan

The link always shows the latest result for this exact file (its SHA-256 fingerprint).

Reads the latest antivirus results for this file's hash. Nothing is uploaded.

Antivirus results

17 of 70 flagged

  • Flagged 17
  • No detection 53
  • No result 4
FileAppvIsvSubsystems32.dll178.2 kBSHA-256 9d99df162cce…ecabc3
  • Code signing Unsigned
  • Test run Completed
  • First seen 1mo ago
17 of the 70 antivirus engines that checked it flag it, including Microsoft and Bitdefender.

Chapter 02

Why we think so

6 points against it and 5 in its favour, checked against the scan evidence.

MT AI Engine · Verdict analysis

The reasoning behind this verdict

Analyst conclusion

This unsigned DLL drew detections from 17 of the 70 antivirus engines that checked it, including four independent major votes. Multiple engines identify Yogi, although other labels differ and the sandbox produced no explicit malware judgment; avoid loading the DLL and quarantine it while investigating its source.

Where this verdict could be wrong3 caveats
  • No sandbox returned a malicious verdict and no offensive techniques were mapped; the completed sandbox run did not independently label the execution malicious.
  • The hash is not listed in the MalwareBazaar malware database and no community YARA rule matched, although absence of those matches does not establish benignness.
  • The file does not appear packed and no code section has packed-level entropy, providing no static indication of packing or unusually entropic code.

These are the assessment's weak points. If you believe one applies to your file, report the verdict and we'll re-review it.

6 sources checked · 5 complete · 1 not needed or not applicable. See every source

Chapter 03

What it did in our test

It ran in our isolated test environment; no test environment rated what it did as risky.

Test run summary

Capture complete
  • 5sandbox rule tags
  • 7spawned processes
  • 0network contacts
  • 1filesystem & mutex artifacts

What the test run showed

What the file did on a test computer

Confirmed in the test run

  • Moderate concern: Checked whether it was running on a test computer.

  • Note: Read the user name of the test computer.

  • Note: Read basic details of the test computer, such as its Windows version.

Sandbox labels we could not confirm (common in safe files too)

  • Not confirmed: A sandbox rule tagged this run as changing how Windows loads code; nothing confirms it.

This file was run on a test computer (a sandbox), not on yours. Labels we could not confirm are listed so you can see them, but they are not treated as evidence against the file.

Threat context

How trojans work

A trojan pretends to be something useful or harmless so that you run it. Once open, it does its real job in the background, from stealing data to opening a back door or downloading more malware.

Bottom line:The disguise is the whole trick, so a trustworthy-looking name or icon means nothing.

Recorded behavior

What happened in the test

Grouped by step. The order is not a timeline.

Seen in the test runWorked out from other results

  1. Input file

    The submitted object

    1
    1. Evidence 1 of 4: FileSeen in the test run

      AppvIsvSubsystems32.dll

      9d99df162cce23576b0019e5a8667ff025cd6e49cb8ffcceb9a6f8d36decabc3

      Uploaded file

  2. Processes

    What ran

    2
    1. Evidence 2 of 4: ProcessSeen in the test run

      rundll32.exe

      "C:\Windows\System32\rundll32.exe" "C:\Users\<USER>\Desktop\AppvIsvSubsystems32.dll",#1

      Test run
    2. Evidence 3 of 4: ProcessSeen in the test run

      loaddll32.exe

      C:\Windows\System32\loaddll32.exe loaddll32.exe "C:\Users\user\Desktop\AppvIsvSubsystems32.dll"

      Test run
    3. +1 more recorded observation

  3. Files

    Created or changed

    1
    1. Evidence 4 of 4: Written fileSeen in the test run

      Connect

      \Device\ConDrv\\Connect

      Test run

4 facts from the test run. See the full activity list.

Chapter 04

Technical details

17 of the 70 antivirus engines that checked it flag it; no publisher signature.

Sources checked

Every check behind this verdict

6 sources checked · 5 complete · 1 not needed or not applicable. Complete means the check returned a usable result; it does not mean the file is safe.

SourceStatusResultChecked
Antivirus enginesVirusTotal · 74 enginesCompleteRisk signal: 17 of 70 engines flagged it · 4 gave no result Details for antivirus engines
Sandbox runVirusTotal sandboxesCompleteRuntime behaviour was recorded Details for sandbox run
Contacted hostsMalwareTips URL scannerNot neededThe sandbox recorded no contacted hosts to checkNo date recorded
Signature rulesYARAify community rules + MalwareTips rulesCompleteNo rule matched
Malware sample databaseabuse.ch MalwareBazaarCompleteNot listed
Known-software referenceCIRCL hashlookupCompleteNo match

Engines that flagged it 17

  • Avast (major engine)Win32:SuspBehav-B [Heur]
  • AVG (major engine)Win32:SuspBehav-B [Heur]
  • BitDefender (major engine)Gen:Variant.Yogi.65517
  • Emsisoft (major engine)Gen:Variant.Yogi.65517 (B)
  • GData (major engine)Gen:Variant.Yogi.65517
  • Microsoft (major engine)Trojan:Win32/Wacatac.B!ml
  • TrendMicro-HouseCall (major engine)Trojan.Win32.VSX.PE04CAB
  • ALYacGen:Variant.Yogi.65517
9 more in the full engine list

File fingerprint

Last analyzed
Sep 15, 2026, 1:16 AM UTC
SHA-256
9d99df162cce23576b0019e5a8667ff025cd6e49cb8ffcceb9a6f8d36decabc3
SHA-1
83ad7f3be5f15f238673536d45a5e2b83fdceeeb
MD5
dd960e34d769221f59a501514948f89b

About this file

AppvIsvSubsystems32.dll is a Win32 DLL file of 178.2 kB.

Type and size
Win32 DLL · 178.2 kB
Signer
UnsignedNo code signature.
First seen
Sep 15, 2026On VirusTotal.
Submitted by
1 sourceRarely seen: few people have submitted this exact file.
Packer
None detected
Entropy
5.74 of 8

First scanned

Chapter 05

Questions & answers

Short answers to the 8 questions people ask most about this file.

Is AppvIsvSubsystems32.dll a virus?
Yes. This copy of AppvIsvSubsystems32.dll (SHA-256 9d99df16…abc3) is malicious. Other files with the same name can be different, so check the hash. Don't use it. Let your antivirus remove this component, then repair or reinstall the program it belongs to from its official website. Don't delete or replace the file by hand. 17 of the 70 antivirus engines that checked it flag it. Antivirus engines classify it as a trojan: malware disguised as something harmless so that you run it. If you've already used it, see the steps below.
What is AppvIsvSubsystems32.dll?
AppvIsvSubsystems32.dll is a Windows library (DLL), about 178.2 kB. It carries no version information saying what it is or who made it. VirusTotal first saw it on Sep 15, 2026.
How many antivirus engines detected AppvIsvSubsystems32.dll?
17 of the 70 antivirus engines that checked it flag AppvIsvSubsystems32.dll, including Microsoft and Bitdefender. We weigh which engines flagged it and what else the scan found, not just the count. The rating comes from all the evidence together, not from this count alone.
What should I do if I already used AppvIsvSubsystems32.dll?
Act quickly. 1) Disconnect the device from the internet. 2) Run a full scan with your antivirus and let it remove what it finds. 3) Change your important passwords from another device you trust, starting with email and banking, and turn on two-step verification. 4) If you bank or shop on this device, watch your accounts and tell your bank about payments you don't recognise. 5) If the scan keeps finding it, back up your personal files and reinstall Windows.
How do I remove AppvIsvSubsystems32.dll?
To remove AppvIsvSubsystems32.dll: 1) run a full scan with your antivirus and let it remove what it finds. 2) Let your antivirus remove this component, then repair or reinstall the program it belongs to from its official website. Don't delete or replace the file by hand. 3) Check Settings > Apps, your browser extensions, startup apps (Task Manager > Startup apps) and scheduled tasks for anything you don't recognise. 4) Restart and scan again. If it keeps coming back, scan from Safe Mode with Networking, or back up your files and reinstall Windows.
What kind of malware is AppvIsvSubsystems32.dll?
Antivirus engines classify AppvIsvSubsystems32.dll as a trojan: malware disguised as something harmless so that you run it.
What is the SHA-256 hash of AppvIsvSubsystems32.dll?
The SHA-256 fingerprint of AppvIsvSubsystems32.dll is 9d99df162cce23576b0019e5a8667ff025cd6e49cb8ffcceb9a6f8d36decabc3, and its MD5 is dd960e34d769221f59a501514948f89b. Two files with the same SHA-256 are identical, so use it to check you have exactly this file, not just one with the same name.
How up to date is this analysis of AppvIsvSubsystems32.dll?
This report reflects the scan on Sep 15, 2026. A file's fingerprint never changes, but antivirus engines keep learning, so a rating can change later. To get a newer result, scan the file again: we refresh the antivirus results when the saved ones are out of date.
Chapter 06

Community

Member reviews and reports for this exact file hash.

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Recent reports on other files with the same rating.

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