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Verdict Malicious

Analyzed , 10 days ago

Is KryptonClient1.21.11.jar safe? No, we rate this exact file malicious.

The detection pattern strongly supports a Java Agent-style trojan: 19 of the 58 antivirus engines that checked it flagged the file, including five major antivirus engines and 14…

Read the whole reasonShow less

Strong evidence · Two or more major antivirus engines agree.

Don't open or run this Java file

If you already opened or ran 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 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

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KryptonClient1.21.11.jar: Malicious — MalwareTips file scan

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

Antivirus results

19 of 58 flagged

  • Flagged 19
  • No detection 39
  • No result 17
FileKryptonClient1.21.11.jar5.6 MBSHA-256 7ee09d5fe21b…56a28a
  • Code signing Not applicable
  • Test run Completed
  • First seen 21d ago
19 of the 58 antivirus engines that checked it flag it, including ESET and Arcabit.

Chapter 02

Why we think so

5 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

One sandbox run returned clean, but its T1055, T1543.002, and mappings add concern, and no complete host-reputation cross-check is available.

Where this verdict could be wrong2 caveats
  • The only completed sandbox run returned clean and recorded no injected target process.
  • No MalwareBazaar, CIRCL, or YARAify match was found, although absence of such intelligence does not clear the file.

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
  • 16sandbox rule tags
  • 3spawned processes
  • 0network contacts
  • 15filesystem & 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 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

      KryptonClient1.21.11.jar

      7ee09d5fe21bd9046d530b517b85d3a6016f5a22ae39a6bf99f9cc09c856a28a

      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" -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

      5300

      C:\Users\<USER>\AppData\Local\Temp\hsperfdata_<USER>\5300

      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

19 of the 58 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 enginesCompleteRisk signal: 19 of 58 engines flagged it · 17 gave no result Details for antivirus engines
Sandbox runVirusTotal sandboxesCompleteCombined summary: clean verdict 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 19

  • Avira (major engine)TR/JAVA.Agent
  • Emsisoft (major engine)Trojan.GenericKD.81676617 (B)
  • ESET-NOD32 (major engine)Java/Agent.ADG trojan
  • F-Secure (major engine)Trojan.TR/JAVA.Agent
  • Fortinet (major engine)Java/Agent.ADG!tr
  • GData (major engine)Trojan.GenericKD.81676617
  • Symantec (major engine)Trojan.Gen.NPE
  • AlibabaTrojan:JAVA/Generic.c38b2993
11 more in the full engine list

File fingerprint

Last analyzed
Oct 15, 2026, 4:24 PM UTC
SHA-256
7ee09d5fe21bd9046d530b517b85d3a6016f5a22ae39a6bf99f9cc09c856a28a
SHA-1
6a2c68b8111618abd175e30aa40e6b349b14bd56
MD5
7e0da296795c7fe8f1278b748403def5

About this file

KryptonClient1.21.11.jar is a JAR file of 5.6 MB.

Type and size
JAR · 5.6 MB
Signer
Not applicable
First seen
Oct 4, 2026On VirusTotal.
Submitted by
28 distinct sources

First scanned

Chapter 05

Questions & answers

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

Is KryptonClient1.21.11.jar a virus?
Yes. This copy of KryptonClient1.21.11.jar (SHA-256 7ee09d5f…a28a) 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. 19 of the 58 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 opened or run it, see the steps below.
What is KryptonClient1.21.11.jar?
KryptonClient1.21.11.jar is a Java program (JAR), about 5.6 MB. VirusTotal first saw it on Oct 4, 2026.
How many antivirus engines detected KryptonClient1.21.11.jar?
19 of the 58 antivirus engines that checked it flag KryptonClient1.21.11.jar, including ESET and Arcabit. 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 opened or ran KryptonClient1.21.11.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 KryptonClient1.21.11.jar?
To remove KryptonClient1.21.11.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 KryptonClient1.21.11.jar?
Antivirus engines classify KryptonClient1.21.11.jar as a trojan: malware disguised as something harmless so that you run it.
What is the SHA-256 hash of KryptonClient1.21.11.jar?
The SHA-256 fingerprint of KryptonClient1.21.11.jar is 7ee09d5fe21bd9046d530b517b85d3a6016f5a22ae39a6bf99f9cc09c856a28a, and its MD5 is 7e0da296795c7fe8f1278b748403def5. 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 KryptonClient1.21.11.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.

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