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Verdict Suspicious

Analyzed , 8 days ago

Is Koaloader.dll safe? Treat it as suspicious.

An unsigned DLL-proxy loader linked to game DLC unlocking, flagged by 48 of the 71 antivirus engines that checked it with mostly generic trojan labels and no malicious sandbox…

Read the whole reasonShow less

Why Suspicious? 48 antivirus engines flag it; nothing else confirms it.

Limited evidence · One sign points to a problem; nothing else confirms it.

Don't use it until you know where it came from

Avoid this file unless you knowingly use this game-unlocking loader from its original source, and keep your antivirus enabled rather than creating exclusions for it.

What to do now4 steps

Some signs point to a problem, but nothing confirms it is harmful. Treat it with caution.

What to do

  1. Don't use it unless you're sure where it came from.

  2. Check where you got it: an unexpected attachment, a link someone sent you or a re-upload is a red flag.

  3. If you can't confirm where it came from, delete it. If you need the program, download it again from the publisher's own website.

If you already used it

  1. Stop using it, run a full scan with your antivirus and watch for unexpected behavior or security alerts.

Not sure what to do?

Ask the MalwareTips community before you run it. If you already ran it, follow the cleanup guide.

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

Why we think so

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Koaloader.dll: Suspicious — 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

48 of 71 flagged

  • Flagged 48
  • No detection 23
  • No result 4
FileKoaloader.dll2.2 MBSHA-256 2665a951793e…a4cd00
  • Code signing Unsigned
  • Test run Completed
  • First seen 3y ago
48 of the 71 antivirus engines that checked it flag it, including Microsoft and Bitdefender.

Chapter 02

Why we think so

3 points against it and 3 in its favour, checked against the scan evidence.

MT AI Engine · Verdict analysis

The reasoning behind this verdict

Analyst conclusion

This DLL matches a known loader used to unlock paid game content by hijacking DLL loading. Engines including BitDefender, Microsoft and Fortinet flag it, mostly with generic labels, while Ikarus calls it a potentially unwanted loader. The sandbox runs recorded no malicious activity, but the file is unsigned and tied to piracy tooling.

Where this verdict could be wrong2 caveats
  • Most detections are generic labels, and no sandbox run recorded malicious activity, so the file may be only the intended game-unlocking loader.
  • Some 'Koder' labels may reflect real trojanised copies circulating under this name, so the detections cannot be dismissed entirely.

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 · all complete. See every source

Chapter 03

What it did in our test

It ran in 4 isolated tests; no test environment rated what it did as risky.

Test run summary

Capture complete
  • 4isolated sandbox runs
  • 21sandbox rule tags
  • 15spawned processes
  • 2network contacts
  • 40filesystem & mutex artifacts

What the test run showed

What the file did on a test computer

Confirmed in the test run

  • Moderate concern: Contains packed or scrambled code that is harder to inspect (common in installers too).

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

  • Note: Read the network settings of the test computer.

  • Note: Listed the programs running on the test computer.

  • Note: Talked to servers over the internet during the test run.

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

  • Note: Looked through folders on the test computer (most installers do this).

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

  • Not confirmed: A sandbox rule tagged this run as code injection, but no injected program was recorded.

  • Not confirmed: A sandbox rule tagged this run as recording keystrokes; no keylogging was confirmed.

  • Not confirmed: A sandbox rule tagged this run as weakening security settings; no setting change was recorded.

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.

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 7: FileSeen in the test run

      Koaloader.dll

      2665a951793eac577c89d9115aff15b3c69f87af4da15a93a81200c890a4cd00

      Uploaded file

  2. Processes

    What ran

    2
    1. Evidence 2 of 7: ProcessSeen in the test run

      rundll32.exe

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

      Test run
    2. Evidence 3 of 7: ProcessSeen in the test run

      loaddll32.exe

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

      Test run
    3. +1 more recorded observation

  3. Files

    Created or changed

    2
    1. Evidence 4 of 7: Written fileSeen in the test run

      Temp

      C:\ProgramData\Microsoft\Windows\WER\Temp

      Test run
    2. Evidence 5 of 7: Written fileSeen in the test run

      ef396630-f986-4029-bdee-e49fe8f0dc98

      C:\ProgramData\Microsoft\Windows\WER\Temp\ef396630-f986-4029-bdee-e49fe8f0dc98

      Test run
    3. +1 more recorded observation

  4. Network

    Hosts contacted

    2
    1. Evidence 6 of 7: Contacted hostSeen in the test run

      20.189.173.20

      Contacted during the test run.

      Test run
    2. Evidence 7 of 7: Contacted hostSeen in the test run

      20.189.173.21

      Contacted during the test run.

      Test run
    3. +1 more recorded observation

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

Chapter 04

Technical details

48 of the 71 antivirus engines that checked it flag it; no publisher signature.

Sources checked

Every check behind this verdict

6 sources checked · all complete. Complete means the check returned a usable result; it does not mean the file is safe.

SourceStatusResultChecked
Antivirus enginesVirusTotal · 75 enginesCompleteRisk signal: 48 of 71 engines flagged it · 4 gave no result Details for antivirus engines
Sandbox runVirusTotal sandboxes · C2AE, CAPA, CAPE SandboxComplete4 runs: 1 clean, 3 without a verdict Details for sandbox run
Contacted hostsMalwareTips URL scannerComplete4 contacted hosts checked Details for contacted hosts
Signature rulesYARAify community rules + MalwareTips rulesComplete1 MalwareTips behaviour rule Details for signature rules
Malware sample databaseabuse.ch MalwareBazaarCompleteNot listed
Known-software referenceCIRCL hashlookupCompleteNo match

Engines that flagged it 48

  • Avast (major engine)Win32:MalwareX-gen [Bd]
  • AVG (major engine)Win32:MalwareX-gen [Bd]
  • BitDefender (major engine)Generic.Trojan.Koder.Marte.A.16B3CFD5
  • Emsisoft (major engine)Generic.Trojan.Koder.Marte.A.16B3CFD5 (B)
  • Fortinet (major engine)W32/Agent.AAWO!tr
  • GData (major engine)Generic.Trojan.Koder.Marte.A.16B3CFD5
  • Ikarus (major engine)PUA.KoalaLoader
  • Microsoft (major engine)Trojan:Win32/Tnega!MSR
40 more in the full engine list

File fingerprint

Last analyzed
Oct 18, 2026, 5:08 PM UTC
SHA-256
2665a951793eac577c89d9115aff15b3c69f87af4da15a93a81200c890a4cd00
SHA-1
638669c749cd493c4407e8c674ecff60a317da80
MD5
7e92b09ee4fe34c50415140a0c1130ab

About this file

Koaloader.dll says it is https://github.com/acidicoala/Koaloader (Koaloader), 2.2 MB.

Claims to be
https://github.com/acidicoala/Koaloader (Koaloader)From the file's own version information, written by whoever built it.
Original name
Koaloader.dllMatches the shared file name.
Type and size
Win32 DLL · 2.2 MB
Signer
UnsignedNo code signature.
First seen
Jan 15, 2023On VirusTotal.
Submitted by
1,224 distinct sources
Packer
None detected
Entropy
6.20 of 8

First scanned Updated

Verdict history

  1. Not fully confirmed
  2. Suspiciousafter 2 more engines flagged it

Ratings change when antivirus engines, our checks or MalwareTips staff learn more about a file.

Chapter 05

Questions & answers

Short answers to the 6 questions people ask most about this file.

Is Koaloader.dll safe, or is it malware?
Koaloader.dll is rated Suspicious: some signs point to a problem, but nothing confirms it is harmful. 48 of the 71 antivirus engines that checked it flag it. Don't use it unless you're sure where it came from. If a program needs this file, reinstall that program from its official website instead of replacing the file on its own.
What is Koaloader.dll?
Koaloader.dll is a Windows library (DLL), about 2.2 MB. Its version information says it is “https://github.com/acidicoala/Koaloader” (Koaloader). Version information is written by whoever built the file, so it is a claim, not proof of who made it. VirusTotal first saw it on Jan 15, 2023.
How many antivirus engines detected Koaloader.dll?
48 of the 71 antivirus engines that checked it flag Koaloader.dll, including Microsoft and Bitdefender. We weigh which engines flagged it and what else the scan found, not just the count.
What should I do if I already used Koaloader.dll?
No infection is confirmed: the rating is a caution, not a malware finding. 1) Check where it came from. If you can't confirm the source, delete it. 2) Run a full scan with your security software. 3) If the scan finds something, follow its removal steps and change passwords you typed on the device since then.
What is the SHA-256 hash of Koaloader.dll?
The SHA-256 fingerprint of Koaloader.dll is 2665a951793eac577c89d9115aff15b3c69f87af4da15a93a81200c890a4cd00, and its MD5 is 7e92b09ee4fe34c50415140a0c1130ab. 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 Koaloader.dll?
This report reflects the scan on Oct 18, 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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