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Verdict Malicious

Analyzed , 4 days ago

Is Krypton-Free.jar safe? No, we rate this exact file malicious.

This exact file is listed in abuse.ch MalwareBazaar, a public malware-sample sharing database. 18 of the 63 antivirus engines that checked it also flag it.

Read the whole reasonShow less

Strong evidence · Two or more major antivirus engines agree.

Don't open or run this Java file

Run a full-system antivirus scan.

What to do now4 steps

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

If you haven't opened or run it

  1. Don't open or run this Java file. Delete it, then empty the Recycle Bin or Trash.

If you already opened or ran it

  1. Disconnect the device from the internet, then run a full scan with your security software.

  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 the operating system.

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

Krypton-Free.jar: Malicious — MalwareTips file scan

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

Antivirus results

18 of 63 flagged

  • Flagged 18
  • No detection 45
  • No result 12
FileKrypton-Free.jar30.6 kBSHA-256 d8c72771d069…d3f409
  • Code signing Not applicable
  • Test run Completed
  • First seen 2mo ago
4 strong detection rules matched this file.

Chapter 02

Why we think so

2 points against it and 0 in its favour, checked against the scan evidence.

Malware intelligence match

Why this file is treated as malware

The conclusion below is grounded in the recorded hash match and scan evidence.

Analyst conclusion

It was first listed on Sep 24, 2026; MalwareBazaar publishes no family name for it.

Where this verdict could be wrong1 caveat
  • MalwareBazaar accepts submissions from anyone, including automated uploads; legitimate tools bundled with malware are sometimes listed.

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 5 isolated tests; no test environment rated what it did as risky.

Test run summary

Capture complete
  • 5isolated sandbox runs
  • 15sandbox rule tags
  • 4spawned processes
  • 0network contacts
  • 18filesystem & mutex artifacts

What the test run showed

What the file did on a test computer

Confirmed in the test run

  • Moderate concern: Ran commands or a script on the test computer.

  • Moderate concern: Hid files or windows on the test computer.

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

  • Note: Loaded extra code modules while running.

  • Note: Checked which security software was installed on the test computer.

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 downloading a file, but no download was recorded.

  • Not confirmed: A sandbox rule tagged this run as creating a service; no new service was recorded.

  • 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.

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 5: FileSeen in the test run

      Krypton-Free.jar

      d8c72771d069a35841e5b8a1eb3b1f34faef03bda187b8b97200735e73d3f409

      Uploaded file

  2. Processes

    What ran

    2
    1. Evidence 2 of 5: ProcessSeen in the test run

      javaw.exe

      "C:\Program Files\Java\jre-1.8\bin\javaw.exe" -jar "C:\Users\<USER>\Desktop\sample.jar"

      Test run
    2. Evidence 3 of 5: ProcessSeen in the test run

      cmd.exe

      C:\Windows\SysWOW64\cmd.exe C:\Windows\system32\cmd.exe /c ""C:\Program Files\Java\jre1.8.0_441\bin\java.exe" -javaagent:"C:\Users\user\AppData\Local\Temp\jartracer.jar" -jar "C:\Users\user\Desktop\runtime.jar"" >> C:\cmdlinestart.log 2>&1

      Test run
    3. +1 more recorded observation

  3. Files

    Created or changed

    2
    1. Evidence 4 of 5: Written fileSeen in the test run

      1300

      C:\Users\<USER>\AppData\Local\Temp\hsperfdata_<USER>\1300

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

      3903daac9bc4a3b7.timestamp

      C:\ProgramData\Oracle\Java\.oracle_jre_usage\3903daac9bc4a3b7.timestamp

      Test run
    3. +1 more recorded observation

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

Chapter 04

Technical details

18 of the 63 antivirus engines that checked it flag it.

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: 18 of 63 engines flagged it · 12 gave no result Details for antivirus engines
Sandbox runVirusTotal sandboxes · C2AE, CAPE Sandbox, Rising MOVESComplete5 runs: 1 clean, 4 without a verdict Details for sandbox run
Contacted hostsMalwareTips URL scannerComplete2 contacted hosts checked
Signature rulesYARAify community rules + MalwareTips rulesCompleteRisk signal: 4 community YARA rules (4 malware-specific) · 1 MalwareTips behaviour rule Details for signature rules
Malware sample databaseabuse.ch MalwareBazaarCompleteRisk signal: Listed (no family name published)
Known-software referenceCIRCL hashlookupCompleteNo match

Engines that flagged it 18

  • BitDefender (major engine)Trojan.GenericKD.81559885
  • Emsisoft (major engine)Trojan.GenericKD.81559885 (B)
  • ESET-NOD32 (major engine)Java/MaksRat.G trojan
  • GData (major engine)Trojan.GenericKD.81559885
  • Ikarus (major engine)Trojan.Java.Maksrat
  • Microsoft (major engine)Trojan:Win32/Egairtigado!rfn
  • alibabacloudTrojan:Java/MaksRat.G
  • Antiy-AVLTrojan/Win32.Egairtigado
10 more in the full engine list

File fingerprint

Last analyzed
Oct 22, 2026, 8:13 AM UTC
SHA-256
d8c72771d069a35841e5b8a1eb3b1f34faef03bda187b8b97200735e73d3f409
SHA-1
58aabc0a585c5ce8c9f1443d658b4cce4d6f947d
MD5
15abdf05b983c50cfb4d30698d512de3

About this file

Krypton-Free.jar is a JAR file of 30.6 kB.

Type and size
JAR · 30.6 kB
Signer
Not applicable
First seen
Aug 13, 2026On VirusTotal.
Submitted by
194 distinct sources

First scanned

Chapter 05

Questions & answers

Short answers to the 9 questions people ask most about this file.

Is Krypton-Free.jar a virus?
Yes. This copy of Krypton-Free.jar (SHA-256 d8c72771…f409) is malicious. Other files with the same name can be different, so check the hash. Don't open or run it. Delete it, then empty the Recycle Bin or Trash. 18 of the 63 antivirus engines that checked it flag it. Antivirus engines classify it as a trojan: malware disguised as something harmless so that you run it. This exact file is also listed in MalwareBazaar, a public malware database. If you've already opened or run it, see the steps below.
What is Krypton-Free.jar?
Krypton-Free.jar is a Java program (JAR), about 30.6 kB. VirusTotal first saw it on Aug 13, 2026.
How many antivirus engines detected Krypton-Free.jar?
18 of the 63 antivirus engines that checked it flag Krypton-Free.jar, including Microsoft and ESET. We weigh which engines flagged it and what else the scan found, not just the count. The rating also rests on a listing of this exact file in MalwareBazaar, a public malware database, and on the other evidence.
What should I do if I already opened or ran Krypton-Free.jar?
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 the operating system.
How do I remove Krypton-Free.jar?
To remove Krypton-Free.jar: 1) Delete it, then empty the Recycle Bin or Trash. 2) Run a full scan with your security software. 3) Check the programs that start automatically for anything you don't recognise.
What kind of malware is Krypton-Free.jar?
Antivirus engines classify Krypton-Free.jar as a trojan: malware disguised as something harmless so that you run it.
Has Krypton-Free.jar been seen before?
Yes. This exact file is listed in MalwareBazaar, a public malware database, first listed on Sep 24, 2026. MalwareBazaar accepts uploads from anyone, including automated ones, so the listing supports the other evidence rather than proving malice on its own.
What is the SHA-256 hash of Krypton-Free.jar?
The SHA-256 fingerprint of Krypton-Free.jar is d8c72771d069a35841e5b8a1eb3b1f34faef03bda187b8b97200735e73d3f409, and its MD5 is 15abdf05b983c50cfb4d30698d512de3. 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 Krypton-Free.jar?
This report reflects the scan on Oct 22, 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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