Is marlowwwclient-v5.jar safe?
No antivirus engine detected this JAR, but potentially offensive runtime techniques and an unresolved direct-IP connection justify caution pending further verification.
All 75 antivirus engines were silent, including 17 tier-1 contributors, and the completed sandbox did not issue a malware finding. However, runtime evidence mapped activity to process injection, service modification, and defense impairment, while the direct-IP contact lacks a completed reputation check.
5572f87e53b9d666ae…4e900881e290d7Recommended 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.
All 75 antivirus engines were silent, including 17 tier-1 contributors, and the completed sandbox did not issue a malware finding. However, runtime evidence mapped activity to process injection, service modification, and defense impairment, while the direct-IP contact lacks a completed reputation check.
Static scanning provides substantial reassurance because 0 of 75 engines reported a detection, including all 17 tier-1 contributors. One completed sandbox did not return a malware finding, and no known-malicious child was identified. However, the runtime mapping includes T1055, T1543.002, and T1562.001, which are meaningful offensive-behavior indicators even though technique mappings do not establish intent by themselves. The sample also contacted 162.159.36.2 directly, and no complete host-reputation result is available. With no named family or external-intelligence corroboration, the evidence supports caution rather than a definitive malware attribution.
What We Detected
The file is an 8.1 MB JAR first submitted four days ago. None of 75 antivirus engines flagged it, including 17 tier-1 contributors, and there is no agreed threat family. Research feeds also returned no matching MalwareBazaar entry, CIRCL record, or YARAify rule.
Threat Behavior
One completed sandbox run did not issue a malware finding. Nevertheless, its activity was mapped to T1055, T1543.002, and T1562.001, covering possible process injection, service modification, and defense impairment. It also contacted the IP address 162.159.36.2 directly; because contactedHosts is unavailable, no complete reputation result exists for that connection. Four dropped hashes were inspected without a known-malicious result, but their individual status remains unknown.
What To Do Now
Keep endpoint protection enabled and avoid running the JAR on a production or personal system unless its source and expected behavior can be independently verified. If execution is necessary, use an isolated disposable environment and monitor child processes, service changes, and outbound traffic.
Where this verdict could be wrong3 caveats
- The runtime mapping includes T1055, T1543.002, and T1562.001, techniques associated with process injection, service modification, and defense impairment.
- The direct connection to 162.159.36.2 lacks a completed contactedHosts reputation cross-check.
- All four dropped children have unknown individual verdicts, so hasMaliciousChild=false does not establish that they are benign.
These are the assessment's weak points. If you believe one applies to your file, report the verdict and we'll re-review it.
- 0/75 antivirus engines reported a malicious or suspicious result.
- All 17 tier-1 contributors reported no detection.
- behaviour.hasMaliciousSandboxVerdict=false after 1 completed sandbox.
- droppedChildren.hasMaliciousChild=false for 4 inspected hashes.
- YARAify, CIRCL, and MalwareBazaar returned no matching intelligence.
- Runtime mapping includes MITRE T1055 process injection.
- Runtime mapping includes MITRE T1543.002 service modification.
- Runtime mapping includes MITRE T1562.001 defense impairment.
- Direct connection to 162.159.36.2 has no completed host-reputation cross-check.
- All 4 dropped children retain unknown individual verdicts.
- The file was first submitted only 4 days ago.
Do not run the JAR unless its origin and purpose are trusted and independently verified. Keep endpoint protection enabled and use an isolated environment if further testing is required.
Coverage & freshness
Complete means the check returned a usable result. It does not mean the file is safe.
Antivirus
Complete0 of 75 engines flagged the file.
Sandbox
Complete1 isolated runtime environment contributed observations.
Network
Partial1 runtime contact was observed without a completed reputation cross-check.
YARA
Complete2 signature or behavior rules matched.
External intel
Complete3 of 3 independent reference sources completed.
Behavior
Plain-English impact first, then the observed runtime evidence.
Runtime flight recorder
Capture complete- 1isolated sandbox run
- 16MITRE ATT&CK techniques
- 15spawned processes
- 1network contacts
- 11filesystem & 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: Contained obfuscated or packed code that makes inspection harder.
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: 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
marlowwwclient-v5.jar
5572f87e53b9d666ae50a9903880c0e7099a9965ad3e1e90814e900881e290d7
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
856
C:\Users\<USER>\AppData\Local\Temp\hsperfdata_<USER>\856
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
Network
Hosts contacted
- Contacted hostObserved
162.159.36.2
Contact observed during runtime.
06Isolated runtime analysis
6 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.
- 162.159.36.2
- C:\Users\<USER>\AppData\Local\Temp\hsperfdata_<USER>\856
- 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\2080
- C:\Users\user\AppData\Local\Temp\hsperfdata_user\2324
- /tmp/hsperfdata_root/3545
Files this sample writes at runtime
This file drops 4 children at runtime. None are currently flagged malicious in our cache.
- 70f29c30c7f375056ee5…e4158aNever scannednever seen before
- e7fc55ed88f558b69464…8fb4aeNever scannednever seen before
- c1de3a9376fdaef0ba6a…308b70Never scannednever seen before
- d87c5f3cdfb5b7c0510e…1ade9eNever 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.
- 2rule hits recorded
- 0 / 75engines flagged
- 40sources 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
0 of 75 antivirus engines flagged the file.
ProvenanceObservedSourceAntivirus analysisObserved at - 03
The hash has been submitted 42 times from 40 sources.
ProvenanceDerivedSourceSaved report factsObserved at - 04
Scanned file: marlowwwclient-v5.jar — 5572f87e53b9d666ae50a9903880c0e7099a9965ad3e1e90814e900881e290d7
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: 856 — C:\Users\<USER>\AppData\Local\Temp\hsperfdata_<USER>\856
ProvenanceObservedSourceIsolated runtime analysisObserved at - 08
File written: 3903daac9bc4a3b7.timestamp — C:\ProgramData\Oracle\Java\.oracle_jre_usage\3903daac9bc4a3b7.timestamp
ProvenanceObservedSourceIsolated runtime analysisObserved at - 09
Contacted host: 162.159.36.2 — Contact observed during runtime.
ProvenanceObservedSourceIsolated runtime analysisObserved at
Detection sources at a glance
The available sources did not agree on a named threat category.
MalwareBazaar, YARAify, and CIRCL hashlookup completed and returned no entries for this hash.
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"The sample contacted an external IP address directly and no application domain was recorded. Direct-IP traffic also occurs in legitimate installers and infrastructure, so this is supporting context only and requires corroboration from host reputation and other runtime evidence.
Evidence162.159.36.2
0 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
- marlowwwclient-v5.jar
- Format
- JAR
- Code signing
- Not applicable to this file type
- Size
- 8.1 MB
- Last analyzed
- Oct 1, 2026, 12:33 AM UTC
5572f87e53b9d666ae50a9903880c0e7099a9965ad3e1e90814e900881e290d7Safety & 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 marlowwwclient-v5.jar safe, or is it malware?
What is marlowwwclient-v5.jar?
How many antivirus engines detected marlowwwclient-v5.jar?
I already downloaded and opened or ran marlowwwclient-v5.jar — what should I do?
How do I remove marlowwwclient-v5.jar?
What is the SHA-256 hash of marlowwwclient-v5.jar?
How up to date is this analysis of marlowwwclient-v5.jar?
Community
Member reviews and reports for this exact file hash.