Is fakepay-client-1.21.11.jar safe?
Single tier-1 detection plus sandbox process-injection signals on a recently submitted JAR.
One high-trust engine flagged the sample as HEUR:Trojan.Java.Generic while 15 tier-1 engines stayed silent. Sandbox logs show process injection, persistence, and defense-evasion techniques, yet no family consensus or malicious child files were found.
b4cd0a06bd68ad81aa…e8e8975d638b8bRecommended next actions
Before opening or running
Do not open or run it until the source and publisher can be verified independently.
If you already opened or ran it
Stop using it, scan the device, and watch for unexpected behavior or security alerts. Get a fresh copy from the publisher's official site and verify its exact hash when possible.
Intelligence
The saved assessment, checked against the scan evidence and recorded coverage.
The reasoning behind this verdict
This section explains the evidence supporting the verdict and keeps conflicting or missing signals visible.
One high-trust engine flagged the sample as HEUR:Trojan.Java.Generic while 15 tier-1 engines stayed silent. Sandbox logs show process injection, persistence, and defense-evasion techniques, yet no family consensus or malicious child files were found.
The single Kaspersky detection is a meaningful signal but lacks corroboration from other tier-1 engines. Observed MITRE techniques T1055, T1543.002 and T1562.001 indicate suspicious runtime behaviour, yet the sandbox itself did not return a malicious verdict. Medium prevalence and eight-day age suggest the file is not brand-new commodity malware, but the combination of offensive techniques and the lone tier-1 flag keeps the risk elevated.
What We Detected
One of 75 engines (Kaspersky) returned HEUR:Trojan.Java.Generic. Sandbox execution recorded process injection (T1055), service creation (T1543.002) and defense-evasion (T1562.001) calls. Nine dropped files were inspected; none carried malicious verdicts.
Threat Behavior
The JAR writes temporary Java performance data, adjusts ACLs on Oracle JRE folders, and spawns additional Java processes. No C2 domains or malicious child hashes were observed, and contacted-host reputation data is unavailable.
What To Do Now
Keep antivirus and endpoint protection enabled. Avoid executing the file until further sandbox or source verification is available. If obtained from an untrusted source, delete it and scan the originating system.
Where this verdict could be wrong1 caveat
- Only one tier-1 engine flagged; 15 tier-1 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.
- 15 tier-1 engines reported clean
- No malicious dropped children
- Medium prevalence across 17 submitters
- Process injection capability (T1055)
- Persistence mechanism (T1543.002)
- Defense-evasion attempts (T1562.001)
- Single tier-1 malicious detection
Treat the file as untrusted; do not run it until additional independent analysis confirms safety.
Coverage & freshness
Complete means the check returned a usable result. It does not mean the file is safe.
Antivirus
Complete1 of 75 engines flagged the file.
Sandbox
Complete1 isolated runtime environment contributed observations.
Network
Not runNo contacted-host reputation check is recorded.
No timestamp recordedYARA
Complete1 signature or behavior rule matched.
External intel
PartialIndependent reference checks were attempted but are incomplete.
Behavior
Plain-English impact first, then the observed runtime evidence.
Runtime flight recorder
Capture complete- 1isolated sandbox run
- 16MITRE ATT&CK techniques
- 15spawned processes
- 0network contacts
- 15filesystem & mutex artifacts
What this file does
Observed actions and their security significance
High concern: Injected code into another process, a technique that can conceal execution.
High concern: Created or modified a system service, which can keep code running.
High concern: Attempted to impair or bypass security controls.
Moderate concern: Runs hidden system commands (script or shell).
Moderate concern: Transferred a file over the network; malware can use this to fetch additional payloads.
Moderate concern: Checked the environment for virtualisation or analysis tools.
Moderate concern: Checks which security software you have installed.
These are observed capabilities from an isolated analysis. A technique does not prove malicious intent on its own, and the file never ran on your device.
Attack story
Runtime observations grouped by analysis stage. Arrows organize the stages; they do not claim chronology or causality.
Input file
The submitted object
- FileObserved
fakepay-client-1.21.11.jar
b4cd0a06bd68ad81aa325bc82d494e12dec879d80f3311a8dfe8e8975d638b8b
01Uploaded file
Processes
Runtime execution
- ProcessObserved
Observed process
"C:\Program Files\Java\jre-1.8\bin\javaw.exe" -jar "C:\Users\<USER>\Desktop\download.jar"
02Isolated runtime analysis - ProcessObserved
Observed process
C:\Windows\system32\icacls.exe C:\ProgramData\Oracle\Java\.oracle_jre_usage /grant "everyone":(OI)(CI)M
03Isolated runtime analysis - +1 more recorded observation in Analyst mode
Files
Created or changed
- Written fileObserved
5276
C:\Users\<USER>\AppData\Local\Temp\hsperfdata_<USER>\5276
04Isolated runtime analysis - Written fileObserved
3903daac9bc4a3b7.timestamp
C:\ProgramData\Oracle\Java\.oracle_jre_usage\3903daac9bc4a3b7.timestamp
05Isolated runtime analysis - +1 more recorded observation in Analyst mode
5 recorded facts from one runtime window. Every fact remains independently traceable in Analyst mode.
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.
- C:\Users\<USER>\AppData\Local\Temp\hsperfdata_<USER>\5276
- C:\ProgramData\Oracle\Java\.oracle_jre_usage\3903daac9bc4a3b7.timestamp
- C:\ProgramData\Oracle\Java\.oracle_jre_usage\17dfc292991c8786.timestamp
- C:\Users\user\AppData\Local\Temp\hsperfdata_user
- C:\Users\user\AppData\Local\Temp\hsperfdata_user\5500
- C:\Users\user\AppData\Local\Temp\hsperfdata_user\4008
- /tmp/hsperfdata_root/3578
Files this sample writes at runtime
This file drops 9 children at runtime. None are currently flagged malicious in our cache.
- 48cf2cec33318ae4ea55…050e2fNever scannednever seen before
- 5e2974fc61455c0f7d0e…c9aa30Never scannednever seen before
- 499c8801a796b52495a1…1bf671Never scannednever seen before
- 2cee19483cddc6d896bd…02d6abNever scannednever seen before
- d87c5f3cdfb5b7c0510e…1ade9eNever scannednever seen before
- 61625fd8b084f70f242d…55abd2Never scannednever seen before
- 50c82f36208ed8040447…2d7843Never scannednever seen before
- 8e8711854186c68e2368…4a3c7cNever scannednever seen before
- 759aafcfa2395ce1b800…2af0f7Never scannednever seen before
Detection & Forensics
Consensus, attribution, signatures, code structure, prevalence, and identity.
Evidence integrity
Chain of custody for the facts preserved in this report.
- 1rule hit recorded
- 1 / 75engines flagged
- 17sources in submission history
Why these facts are shown
Each statement identifies whether it was directly recorded or derived from saved scan facts.
- 01
1 high-confidence signature or behavior rule matched this file.
Verdict inputView chapterProvenanceDerivedSourceSignature and behavior rulesObserved at - 02
1 of 75 antivirus engines flagged the file, including Kaspersky.
Verdict inputView chapterProvenanceObservedSourceAntivirus analysisObserved at - 03
The hash has been submitted 20 times from 17 sources.
ProvenanceDerivedSourceSaved report factsObserved at - 04
Scanned file: fakepay-client-1.21.11.jar — b4cd0a06bd68ad81aa325bc82d494e12dec879d80f3311a8dfe8e8975d638b8b
ProvenanceObservedSourceUploaded fileObserved at - 05
Observed process — "C:\Program Files\Java\jre-1.8\bin\javaw.exe" -jar "C:\Users\<USER>\Desktop\download.jar"
ProvenanceObservedSourceIsolated runtime analysisObserved at - 06
Observed process — C:\Windows\system32\icacls.exe C:\ProgramData\Oracle\Java\.oracle_jre_usage /grant "everyone":(OI)(CI)M
ProvenanceObservedSourceIsolated runtime analysisObserved at - 07
File written: 5276 — C:\Users\<USER>\AppData\Local\Temp\hsperfdata_<USER>\5276
ProvenanceObservedSourceIsolated runtime analysisObserved at - 08
File written: 3903daac9bc4a3b7.timestamp — C:\ProgramData\Oracle\Java\.oracle_jre_usage\3903daac9bc4a3b7.timestamp
ProvenanceObservedSourceIsolated runtime analysisObserved at
Detection sources at a glance
Category: generic-trojan
Available reference checks returned no match, but at least one source was unavailable. This is not a clean result.
Signatures and behavior heuristics
A community signature or high-severity behavioral heuristic matched. Signatures identify known patterns; heuristics are strong leads but are not proof on their own.
The saved runtime evidence maps this activity to MITRE T1055 (Process Injection). The mapping supports possible process injection, but it does not prove the exact injection method or the operator's intent.
Evidence"C:\Program Files\Java\jre-1.8\bin\javaw.exe" -jar "C:\Users\<USER>\Desktop\download.jar"
1 of 75 engines flagged this file
View all 75 engine results
PE structure
Not applicablePE structure analysis applies to Windows executable formats, not this file type.
How widely this file has been seen
Moderate prevalence — neither rare nor common. No strong prior applies.
Fingerprint and provenance
- File name
- fakepay-client-1.21.11.jar
- Format
- JAR
- Code signing
- Not applicable to this file type
- Size
- 385.2 KB
- Last analyzed
- Aug 6, 2026, 7:27 AM UTC
b4cd0a06bd68ad81aa325bc82d494e12dec879d80f3311a8dfe8e8975d638b8bSafety & FAQ
Complete recovery guidance and answers for the next decision.
What to do now
We couldn't fully clear this file. Treat it with caution.
- Recovery step 01
Don't open or run it unless you're certain it came from a source you trust.
- Recovery step 02
Check where you got it — an unexpected attachment or a random download link is a red flag.
- Recovery step 03
If its origin cannot be confirmed, delete this Java file and use a fresh copy from a trusted source. Get a fresh copy from the publisher's official site and verify its exact hash when possible.
- Recovery step 04
If you're still unsure, scan it again in a day or two — detections often catch up on newer files.
Safety FAQ
Direct answers grounded in the saved verdict and evidence in this report.
Is fakepay-client-1.21.11.jar safe, or is it malware?
What is fakepay-client-1.21.11.jar?
How many antivirus engines detected fakepay-client-1.21.11.jar?
I already downloaded and opened or ran fakepay-client-1.21.11.jar — what should I do?
How do I remove fakepay-client-1.21.11.jar?
What kind of malware is fakepay-client-1.21.11.jar?
What is the SHA-256 hash of fakepay-client-1.21.11.jar?
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Community
Member reviews and reports for this exact file hash.