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Verdict Suspicious

Analyzed , 1 month ago

Is Krypton-1.21.11.jar safe? Treat it as suspicious.

One major antivirus engine flagged the sample as HEUR:Trojan.Java.Generic while 15 other major antivirus engines stayed silent.

Read the whole reasonShow less

Why Suspicious? One antivirus engine (Kaspersky) flags it; nothing else confirms it.

Limited evidence

Don't open or run it until you know where it came from

Treat as suspicious; isolate the file and await additional engine or sandbox results before any execution.

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 open or run 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 opened or ran 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

Share this file report

Krypton-1.21.11.jar: 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

1 of 65 flagged

  • Flagged 1
  • No detection 64
  • No result 10
FileKrypton-1.21.11.jar7.2 MBSHA-256 8f9bacefa223…be824d
  • Code signing Not applicable
  • Test run Completed
  • First seen 2mo ago
1 of the 65 antivirus engines that checked it flags it (Kaspersky).

Chapter 02

Why we think so

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

MT AI Engine · Verdict analysis

The reasoning behind this verdict

Analyst conclusion

Sandbox evidence shows and techniques, yet no malicious files it created or external-intel hits were found.

Where this verdict could be wrong1 caveat
  • Only one major antivirus engine flagged; 15 other major antivirus engines reported clean; no family consensus across engines.

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
  • 13sandbox rule tags
  • 4spawned processes
  • 0network contacts
  • 11filesystem & 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 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 5: FileSeen in the test run

      Krypton-1.21.11.jar

      8f9bacefa22327475476c00e00cf6ab8153707a16e9f65d5285b653a33be824d

      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\download.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

      2620

      C:\Users\<USER>\AppData\Local\Temp\hsperfdata_<USER>\2620

      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

1 of the 65 antivirus engines that checked it flags it.

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 · 75 enginesCompleteRisk signal: 1 of 65 engines flagged it · 10 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 rulesComplete1 MalwareTips behaviour rule Details for signature rules
Malware sample databaseabuse.ch MalwareBazaarCompleteNot listed
Known-software referenceCIRCL hashlookupCompleteNo match

Engines that flagged it 1

  • Kaspersky (major engine)HEUR:Trojan.Java.Generic

File fingerprint

Last analyzed
Aug 27, 2026, 11:38 PM UTC
SHA-256
8f9bacefa22327475476c00e00cf6ab8153707a16e9f65d5285b653a33be824d
SHA-1
91e5af96d33707bca981eb6048f03f6eedafbefc
MD5
ae675ce43e53fe327cd05b8710eee890

About this file

Krypton-1.21.11.jar is a JAR file of 7.2 MB.

Type and size
JAR · 7.2 MB
Signer
Not applicable
First seen
Aug 19, 2026On VirusTotal.
Submitted by
48 distinct sources

First scanned

Chapter 05

Questions & answers

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

Is Krypton-1.21.11.jar safe, or is it malware?
Krypton-1.21.11.jar is rated Suspicious: some signs point to a problem, but nothing confirms it is harmful. 1 of the 65 antivirus engines that checked it flags it. Don't open or run it unless you're sure where it came from. If you need it, download it again from the project's own website.
What is Krypton-1.21.11.jar?
Krypton-1.21.11.jar is a Java program (JAR), about 7.2 MB. VirusTotal first saw it on Aug 19, 2026.
How many antivirus engines detected Krypton-1.21.11.jar?
1 of the 65 antivirus engines that checked it flags Krypton-1.21.11.jar (Kaspersky). We weigh which engines flagged it and what else the scan found, not just the count.
What should I do if I already opened or ran Krypton-1.21.11.jar?
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 Krypton-1.21.11.jar?
The SHA-256 fingerprint of Krypton-1.21.11.jar is 8f9bacefa22327475476c00e00cf6ab8153707a16e9f65d5285b653a33be824d, and its MD5 is ae675ce43e53fe327cd05b8710eee890. 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-1.21.11.jar?
This report reflects the scan on Aug 27, 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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This report and its SHA-256 fingerprint are public, so the next person who checks the same file gets an instant answer; documents and images are listed by type instead of their file name. A file we had not seen before is uploaded to VirusTotal, whose security partners and subscribers can download it; MalwareTips deletes its own copy after the scan. If you ran this file and are worried, scan your device with up-to-date security software.