Is ArCave Installer safe?
Two engines associate this unsigned installer with MediaArena, while observed process-injection and LSASS-targeting activity warrants caution despite no tier-1 detections.
The installer produced concerning runtime evidence, including process-injection mapping and activity targeting LSASS, while Malwarebytes and Gridinsoft both named MediaArena. However, only 3 of 75 engines flagged it, no tier-1 engine agreed, and the sandbox issued no independent malware judgment, leaving the evidence mixed.
120e7294eff78dde79…e6342f49915a04Recommended next actions
Before opening
Do not open it until the source can be verified independently.
If you already opened it
Stop using it, scan the device, and watch for unexpected behavior or security alerts. Get a fresh copy from the original trusted source 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.
The installer produced concerning runtime evidence, including process-injection mapping and activity targeting LSASS, while Malwarebytes and Gridinsoft both named MediaArena. However, only 3 of 75 engines flagged it, no tier-1 engine agreed, and the sandbox issued no independent malware judgment, leaving the evidence mixed.
Three of 75 engines flagged the file, with Malwarebytes and Gridinsoft independently using the MediaArena name. None of the tier-1 engines detected it, so the engine evidence alone is insufficient for a firm malware attribution. More importantly, the completed runtime observation mapped activity to T1055, T1134, and T1485 and recorded process access targeting LSASS. The executable is unsigned and was first observed only two days ago, providing no authenticated publisher history to explain those actions. The observed IP had no adverse cached reputation, and no inspected child was identified as malicious, although all ten child verdicts remain unresolved. Overall, the behavioral findings justify isolation while further verification is obtained.
What We Detected
Three of 75 antivirus engines flagged the installer. Malwarebytes reported Trojan.MediaArena and Gridinsoft reported Trojan.Win32.MediaArena.bot, while Trapmine supplied a generic machine-learning detection. No tier-1 engine detected the sample, and there was no tier-1 family consensus.
Threat Behavior
One completed sandbox run recorded techniques mapped to T1055 process injection, T1134 access-token manipulation, and T1485 data destruction. Saved evidence also reports process activity targeting LSASS, which is associated with credential-access attempts and is unusual for an ordinary installer. The sandbox did not issue an independent malware judgment, and the single observed IP had no adverse cached reputation. Ten dropped files were inspected without a confirmed malicious child, but their individual verdicts remain unknown.
What To Do Now
Do not run the installer on a production or personal system until its origin and publisher can be verified. Keep endpoint protection enabled, quarantine the file, and obtain a fresh copy only from the software project's official release channel.
Where this verdict could be wrong5 caveats
- No tier-1 engine flagged the sample, and only 3/75 engines detected it; this leaves substantial false-positive potential.
- behaviour.hasMaliciousSandboxVerdict=false, so the completed sandbox did not independently issue a malware judgment.
- contactedHosts inspected the sole observed IP, 104.26.12.42, without finding a cached malicious or suspicious classification.
- externalIntel.yaraify.ruleCount=0, externalIntel.circl.hit=false, and externalIntel.malwareBazaar.hit=false; these absences may reflect coverage gaps.
- droppedChildren.hasMaliciousChild=false, although all 10 inspected children have unknown verdicts rather than confirmed benign results.
These are the assessment's weak points. If you believe one applies to your file, report the verdict and we'll re-review it.
- No tier-1 engine detections among 75 total engines
- No independent malicious sandbox judgment
- No cached malicious or suspicious result for the single observed IP
- No confirmed malicious dropped child
- No CIRCL, MalwareBazaar, or YARAify corroboration
- Unsigned Win32 executable with no authenticated publisher
- First observed only two days ago
- Malwarebytes and Gridinsoft both named MediaArena
- Runtime evidence mapped to T1055 process injection
- Saved sandbox evidence reports LSASS-targeting activity
- Runtime techniques include T1134 and T1485
Quarantine the file and avoid executing it until the publisher and official download source are verified. Keep antivirus and endpoint protection enabled, and replace it with a copy obtained directly from the official vendor channel.
Coverage & freshness
Complete means the check returned a usable result. It does not mean the file is safe.
Antivirus
Complete3 of 75 engines flagged the file.
Sandbox
Complete1 isolated runtime environment contributed observations.
Network
Partial1 of 2 contacted hosts were cross-checked; coverage is incomplete.
YARA
Complete3 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
- 29MITRE ATT&CK techniques
- 12spawned processes
- 2network contacts
- 30filesystem & 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: Changed an auto-start location that can make code run after sign-in or restart.
High concern: Attempted to impair or bypass security controls.
High concern: Manipulated how the operating system loads code, which can redirect execution.
Moderate concern: Contained obfuscated or packed code that makes inspection harder.
Moderate concern: Runs hidden system commands (script or shell).
Moderate concern: Communicated over a common application protocol; malware can use this for command-and-control.
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
ArCave Installer
120e7294eff78dde791875e7affd8f52b53220e63db1625665e6342f49915a04
01Uploaded file
Processes
Runtime execution
- ProcessObserved
Observed process
"C:\Users\<USER>\Desktop\OptiFine-26.1.2-HD-U-K1-pre1.jar_214338.exe"
02Isolated runtime analysis - ProcessObserved
Observed process
C:\Windows\Explorer.EXE
03Isolated runtime analysis - +1 more recorded observation in Analyst mode
Files
Created or changed
- Written fileObserved
System.dll
C:\Users\<USER>\AppData\Local\Temp\nsyD4C5.tmp\System.dll
04Isolated runtime analysis - Written fileObserved
nsProcess.dll
C:\Users\<USER>\AppData\Local\Temp\nsyD4C5.tmp\nsProcess.dll
05Isolated runtime analysis - +1 more recorded observation in Analyst mode
Network
Hosts contacted
- Contacted hostObserved
104.26.12.42
Contact observed during runtime.
06Isolated runtime analysis - Contacted hostObserved
licensedproductioninstaller.com
Contact observed during runtime.
07Isolated runtime analysis - +1 more recorded observation in Analyst mode
7 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.
- 104.26.12.42
- https://licensedproductioninstaller.com/?cid=f1c0&iid=773c&fing=f17f&chk=35ac&init=prep
- C:\Users\<USER>\AppData\Local\Temp\nsyD4C5.tmp\System.dll
- C:\Users\<USER>\AppData\Local\Temp\nsyD4C5.tmp\nsProcess.dll
- C:\Users\<USER>\AppData\Local\Temp\nsyD4C5.tmp\INetC.dll
- C:\Users\<USER>\AppData\Local\Temp\nsyD4C5.tmp\status.tmp
- C:\Users\<USER>\AppData\Local\Temp\nsyD4C5.tmp\telemetry.tmp
- C:\Users\<USER>\AppData\Local\Temp\nsyD4C5.tmp\INetC.dll
- C:\Users\<USER>\AppData\Local\Temp\nsyD4C5.tmp\modern-header.bmp
- C:\Users\<USER>\AppData\Local\Temp\nsyD4C5.tmp\modern-wizard.bmp
- C:\Users\<USER>\AppData\Local\Temp\nsyD4C5.tmp\nsDialogs.dll
- C:\Users\<USER>\AppData\Local\Temp\nsyD4C5.tmp\nsProcess.dll
- ArCaveSetup_01_0512ea0b6c4e0451
- cversions.3.m
- Global\OneSettingQueryMutex+compat+encapsulation
- \Sessions\1\BaseNamedObjects\ArCaveSetup_01_0512ea0b6c4e0451
Files this sample writes at runtime
This file drops 10 children at runtime. None are currently flagged malicious in our cache.
- da3f122d19f811a0ee68…fde700Never scannednever seen before
- 63be1a0fe76a4e993169…da2a6bNever scannednever seen before
- 7b9c1315914a29a0c2cf…031106Never scannednever seen before
- 7b42f3990df3e54e215c…e84844Never scannednever seen before
- a2caa9ae4f080fe16e06…3ac293Never scannednever seen before
- b1350f487692057c8ffd…551fc0Never scannednever seen before
- 89675ffa63fda41a40e3…8eb959Never scannednever seen before
- cca47be3de20f63c2f80…b12379Never scannednever seen before
- 63852fa83b1c16c6a411…d75c7cNever scannednever seen before
- e298fd1ac41671693a1a…e34a28Never 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.
- 3rule hits recorded
- 3 / 75engines flagged
- 143sources 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
3 of 75 antivirus engines flagged the file, including Gridinsoft and Malwarebytes.
Verdict inputView chapterProvenanceObservedSourceAntivirus analysisObserved at - 03
The hash has been submitted 168 times from 143 sources.
ProvenanceDerivedSourceSaved report factsObserved at - 04
Scanned file: ArCave Installer — 120e7294eff78dde791875e7affd8f52b53220e63db1625665e6342f49915a04
ProvenanceObservedSourceUploaded fileObserved at - 05
Observed process — "C:\Users\<USER>\Desktop\OptiFine-26.1.2-HD-U-K1-pre1.jar_214338.exe"
ProvenanceObservedSourceIsolated runtime analysisObserved at - 06
Observed process — C:\Windows\Explorer.EXE
ProvenanceObservedSourceIsolated runtime analysisObserved at - 07
File written: System.dll — C:\Users\<USER>\AppData\Local\Temp\nsyD4C5.tmp\System.dll
ProvenanceObservedSourceIsolated runtime analysisObserved at - 08
File written: nsProcess.dll — C:\Users\<USER>\AppData\Local\Temp\nsyD4C5.tmp\nsProcess.dll
ProvenanceObservedSourceIsolated runtime analysisObserved at - 09
Contacted host: 104.26.12.42 — Contact observed during runtime.
ProvenanceObservedSourceIsolated runtime analysisObserved at - 10
Contacted host: licensedproductioninstaller.com — Contact observed during runtime.
ProvenanceObservedSourceIsolated runtime analysisObserved at
Detection sources at a glance
Category: generic-trojan
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.
EvidenceC:\Windows\Explorer.EXESandbox observed process activity targeting LSASS (Windows credential store). Legitimate software has no business reading LSASS memory — this is Mimikatz-shape behaviour.
EvidenceC:\Windows\system32\lsass.exeThe 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.
Evidence104.26.12.42
3 of 75 engines flagged this file
View all 75 engine results
Section entropy & packers
No high-entropy executable section or known packer signature was detected. Data and resource sections can still have high entropy without indicating packed code.
How widely this file has been seen
Lots of people are uploading this but it's recent — typical of newly-released legitimate software. Low prior for malware.
Fingerprint and provenance
- File name
- ArCave Installer
- Format
- Win32 EXE
- Code signing
- No verified publisher
- Size
- 888.6 KB
- Last analyzed
- Sep 9, 2026, 1:20 PM UTC
120e7294eff78dde791875e7affd8f52b53220e63db1625665e6342f49915a04Safety & 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 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 file and use a fresh copy from a trusted source. Get a fresh copy from the original trusted source 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 ArCave Installer safe, or is it malware?
What is ArCave Installer?
How many antivirus engines detected ArCave Installer?
What should I do if I already opened ArCave Installer?
How do I remove ArCave Installer?
What kind of malware is ArCave Installer?
What is the SHA-256 hash of ArCave Installer?
How up to date is this analysis of ArCave Installer?
Community
Member reviews and reports for this exact file hash.