Malicious
Unsigned JAR flagged by three tier-1 engines as Java/Agent.WF with persistence and defense-evasion behaviour.
2a7a04724151d1997c…2804dc6474The reasoning behind this verdict
The MT AI Engine weighs every signal from this scan — antivirus detections, sandbox behaviour, code signing, prevalence and historical matches — to reach a single, evidence-based verdict.
The combination of tier-1 consensus on a named Java trojan family, offensive MITRE techniques for persistence and defense evasion, and the direct-IP C2 heuristic outweighs the absence of dropped malicious children or external-intel hits. Unsigned status removes any trusted-publisher benefit. Medium prevalence indicates the file has circulated but does not offset the malicious signals.
Each signal cites a concrete token from the evidence the arbiter saw — engine name, MITRE technique, signer string, or an exact count.
engines.tier1Malicious=3 with labels Java/Agent.WF trojan (ESET-NOD32, Fortinet) and Trojan.GenericKD.79968231 (BitDefender, Emsisoft, GData)
behaviour.offensiveTechniques=[T1543.002, T1562.001] and triggeredHeuristics[0].rule=MalwareTips.Synth.DirectIpC2 on IP 162.159.36.2
signing.signed=false with no signerStats history
prevalence.classification=medium (38 uniqueSources)
- No malicious dropped children
- Medium prevalence across 38 sources
- Unsigned JAR
- Tier-1 detections on Java/Agent.WF
- Direct-IP contact bypassing DNS
- MITRE techniques T1543.002 and T1562.001
Remove the file and investigate any Java processes or scheduled tasks that may have been created by it.
What this file does
What it attempted when executed in an isolated sandbox
High concern: Installs itself as a Windows service to stay running.
High concern: Tries to disable or bypass your security software.
Moderate concern: Checks which security software you have installed.
Moderate concern: Connects out to 1 server on the internet.
Note: Collects details about your system.
Translated from the file's technical behaviour during analysis. It never ran on your device.
Threat context
How trojans work
A trojan disguises itself as something useful or harmless to trick you into running it. Once open, it does its real job in the background — anything 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.
What to do now
This file is dangerous. Treat it as harmful and remove it.
Don't open or run this file. Delete it from your Downloads (or wherever you saved it), then empty the Recycle Bin.
If you already opened it, disconnect from the internet and run a full scan with your antivirus — Windows Security, built into Windows, is sufficient.
If you typed any passwords while it was open, change them from a device you trust.
In future, only download software from the official website or an official app store.
java corroborated by 2 sources
- VT (74 engines)java
- MT AI Engineagent.wf
What this file did when executed
This file was detonated in 1 sandbox and its runtime behaviour was observed.
Adversary techniques mapped to the MITRE ATT&CK framework.
- 162.159.36.2
- C:\Users\<USER>\AppData\Local\Temp\hsperfdata_<USER>\896
- C:\ProgramData\Oracle\Java\.oracle_jre_usage\3903daac9bc4a3b7.timestamp
- C:\Users\user\AppData\Local\Temp\hsperfdata_user
- C:\Users\user\AppData\Local\Temp\hsperfdata_user\6012
- C:\cmdlinestart.log
- C:\Users\user\AppData\Local\Temp\hsperfdata_user\2424
- /tmp/hsperfdata_root/5010
Files this sample writes at runtime
This file drops 2 children at runtime. None are currently flagged malicious in our cache.
- c416d90fe797bda2b619…ad0962Never scannednever seen before
- d87c5f3cdfb5b7c0510e…1ade9eNever scannednever seen before
YARA & heuristic rule matches
One or more medium-severity heuristic rules matched. Not definitive, but the patterns match known malware behaviour.
Sample contacted 1 external IP address(es) and zero domains. Benign software virtually always uses DNS; no-DNS direct-IP C2 is a strong malware indicator because it bypasses reputation systems and dodges domain-based blocklists.
Evidence162.159.36.2
14 detections across 74 engines
How widely this file has been seen
Moderate prevalence — neither rare nor common. No strong prior applies.
Forensic fingerprint
- File name
- KryptonPlus-1.21.11.jar
- Size
- 1.25 MB
- MIME type
- (unknown)
- Detected type
- JAR
- SHA-256
- 2a7a04724151d1997cbc1224b863aaabb40c83479f738fd71db64c2804dc6474
- MD5
- f52c403991fd7b0ae18788290a333897
- SHA-1
- 289207cffc0b5fd5fa38730ce39d394ad98e85d7
- First seen (VT)
- 4/1/2026, 10:56:06 PM UTC
- Last analysis (VT)
- 7/5/2026, 9:38:39 PM UTC
- First scan (MalwareTips)
- 7/16/2026, 4:22:12 PM UTC
- Last scan (MalwareTips)
- 7/16/2026, 4:22:12 PM UTC
Safety FAQ
Common questions about KryptonPlus-1.21.11.jar, answered from the scan data above.
- Yes — KryptonPlus-1.21.11.jar is malicious, so do not opened it, and delete it. 14 of 74 antivirus engines flag it (family: agent.wf). It behaves as a trojan — malware disguised as something harmless to trick you into running it. If you've already opened it, see the removal and recovery steps below.
- KryptonPlus-1.21.11.jar is a file, about 1.2 MB. Our analysis identifies it as malicious (family: agent.wf) — a trojan — malware disguised as something harmless to trick you into running it. Because a file's name and icon can be faked, the safest way to identify it is by its cryptographic hash (below), not its filename.
- 14 of 74 antivirus engines flagged KryptonPlus-1.21.11.jar, 14 of them as outright malicious. A detection rate at this level is a reliable signal that the file is dangerous.
- Act quickly. 1) Disconnect the device from the internet to stop the malware communicating or spreading. 2) Run a full scan with reputable anti-malware software (such as Malwarebytes) and quarantine everything it finds. 3) Change your important passwords from a DIFFERENT, clean device — many threats log keystrokes or steal saved credentials. 4) If you bank or shop on this device, watch closely for fraud and alert your bank. 5) For a confirmed infection, the most reliable fix is to back up your personal files and reinstall the operating system for a clean start.
- To remove KryptonPlus-1.21.11.jar: 1) restart into Safe Mode (Safe Mode with Networking if you need to download a tool) so the malware doesn't auto-start. 2) Run a full scan with reputable anti-malware software and let it quarantine or delete the detections. 3) Delete the original KryptonPlus-1.21.11.jar file and empty the Recycle Bin/Trash. 4) Check your browser extensions, startup items, and scheduled tasks for anything unfamiliar. 5) Reboot and scan again to confirm it's gone. If detections keep coming back, a clean operating-system reinstall is the most dependable cure.
- KryptonPlus-1.21.11.jar is classified as a trojan — malware disguised as something harmless to trick you into running it. Engines attribute it to the agent.wf family. Knowing the family matters because it tells you the likely impact — data theft, remote control, file encryption, or unwanted ads — and guides the cleanup.
- The SHA-256 hash of KryptonPlus-1.21.11.jar is 2a7a04724151d1997cbc1224b863aaabb40c83479f738fd71db64c2804dc6474, and its MD5 is f52c403991fd7b0ae18788290a333897. This hash is the file's unique fingerprint — two files with the same SHA-256 are identical. Use it to confirm you're looking at exactly this file (not just one with the same name) when comparing against antivirus databases or a download's published checksum.
- This report reflects the scan run on July 16, 2026. Because a file's hash never changes, the identity of KryptonPlus-1.21.11.jar is fixed — but antivirus coverage improves over time, so a file that looks clean today can pick up detections later (and vice-versa). If you need the latest picture, MalwareTips staff can re-run the analysis from scratch.
Reviews & malware reports(0)
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