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Verdict Suspicious

Analyzed , 10 days ago

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

No antivirus engine detected the JAR, but a split sandbox result and unverified and mappings warrant caution before execution.

Read the whole reasonShow less

Why Suspicious? One sandbox test run rated it malicious while another found nothing; nothing else confirms it.

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

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

Verify the download source and expected publisher before opening the JAR. If provenance cannot be established, avoid execution; otherwise test only in isolation with security protection enabled.

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

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kryptonclient-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

0 of 65 flagged

  • Flagged 0
  • No detection 65
  • No result 10
Filekryptonclient-1.21.11.jar5.9 MBSHA-256 3e10a10c9135…36670f
  • Code signing Not applicable
  • Test run Completed
  • First seen 16d ago
A sandbox test run rated its behaviour as malicious.

Chapter 02

Why we think so

3 points against it and 4 in its favour, checked against the scan evidence.

MT AI Engine · Verdict analysis

The reasoning behind this verdict

Analyst conclusion

None of the 65 antivirus engines that checked it flagged this JAR, including the major group. However, one sandbox run produced a malware label and mapped possible process injection and service persistence, while another run was clean and the saved evidence showed no injection target or persistence artifact.

Where this verdict could be wrong2 caveats
  • One sandbox run labeled the sample as malware or a trojan, although the other run returned clean.
  • The eight dropped files have no saved verdicts, so they cannot be treated as confirmed harmless.

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; 1 test environment rated what it did as risky.

Test run summary

Capture complete
  • 16sandbox rule tags
  • 3spawned processes
  • 0network contacts
  • 14filesystem & 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: 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 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.

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

      kryptonclient-1.21.11.jar

      3e10a10c9135a7776b5c59a48c23617351375e3fc67f0d257e730daf8136670f

      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\download.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" -jar "C:\Users\user\Desktop\sample.jar""

      Test run
    3. +1 more recorded observation

  3. Files

    Created or changed

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

      6680

      C:\Users\<USER>\AppData\Local\Temp\hsperfdata_<USER>\6680

      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

None of the 65 antivirus engines that checked it flag 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 enginesCompletePositive signal: 0 of 65 engines flagged it · 10 gave no result Details for antivirus engines
Sandbox runVirusTotal sandboxesCompleteWorth noting: Combined summary is split: malicious and clean verdicts 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

File fingerprint

Last analyzed
Oct 15, 2026, 7:39 PM UTC
SHA-256
3e10a10c9135a7776b5c59a48c23617351375e3fc67f0d257e730daf8136670f
SHA-1
9369626c7501c143e7d041105517ed61d3e35448
MD5
b9e2e1844e8b8bdb271dba0f2ebf8359

About this file

kryptonclient-1.21.11.jar is a JAR file of 5.9 MB.

Type and size
JAR · 5.9 MB
Signer
Not applicable
First seen
Oct 9, 2026On VirusTotal.
Submitted by
55 distinct sources

First scanned

Chapter 05

Questions & answers

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

Is kryptonclient-1.21.11.jar safe, or is it malware?
kryptonclient-1.21.11.jar is rated Suspicious: some signs point to a problem, but nothing confirms it is harmful. No antivirus engine flags it; the caution comes from other evidence, such as who made it, how widely it is used or what it did in a test run. 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 kryptonclient-1.21.11.jar?
kryptonclient-1.21.11.jar is a Java program (JAR), about 5.9 MB. VirusTotal first saw it on Oct 9, 2026.
How many antivirus engines detected kryptonclient-1.21.11.jar?
None of the 65 antivirus engines that checked it flag kryptonclient-1.21.11.jar. A clean antivirus result is not proof of safety; the caution comes from other evidence, such as who made it, how widely it is used or what it did in a test run.
What should I do if I already opened or ran kryptonclient-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 kryptonclient-1.21.11.jar?
The SHA-256 fingerprint of kryptonclient-1.21.11.jar is 3e10a10c9135a7776b5c59a48c23617351375e3fc67f0d257e730daf8136670f, and its MD5 is b9e2e1844e8b8bdb271dba0f2ebf8359. 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 kryptonclient-1.21.11.jar?
This report reflects the scan on Oct 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.

Related file reports

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.