MalwareTips
Threat LensFile scan report

Is OptiFine_1.21.11_HD_U_J9.jar safe?

Verdict
Safe

Safe file assessment

0 of 75 antivirus engines flagged the file.

Open or run with normal care

Open or run with normal care

Read the full analysis
Saved file evidenceAntivirus consensus
0of 75 flagged
Flagged 0No detection 75
Digital specimenOptiFine_1.21.11_HD_U_J9.jar63a60c48b3370920e9…f418be668d3903
Size7.7 MB
Code signingNot applicable
SandboxRuntime complete
First seen7mo ago
Evidence3 priority signals
0 of 75 antivirus engines flagged the file.

Recommended next actions

01

Before opening or running

Open or run it only when its publisher and download source have been independently verified.

02

If you already opened or ran it

Keep normal device protection enabled and stop if the file behaves unexpectedly.

Chapter 02

Intelligence

The saved assessment, checked against the scan evidence and recorded coverage.

No saved analyst narrative

This report keeps the verified scan facts available below without inventing an analysis that was not saved with the scan.

Scan transparency

Coverage & freshness

3 of 5 complete

Complete means the check returned a usable result. It does not mean the file is safe.

  • Antivirus

    Complete

    0 of 75 engines flagged the file.

  • Sandbox

    Complete

    1 isolated runtime environment contributed observations.

  • Network

    Not run

    No contacted-host reputation check is recorded.

    No timestamp recorded

  • YARA

    Complete

    Rule evaluation completed with no recorded matches.

  • External intel

    Not run

    No independent reference checks are recorded.

    No timestamp recorded
Chapter 03

Behavior

Plain-English impact first, then the observed runtime evidence.

Runtime flight recorder

Capture complete
  • 1isolated sandbox run
  • 7MITRE ATT&CK techniques
  • 15spawned processes
  • 0network contacts
  • 15filesystem & mutex artifacts
Recorded behavior

Attack story

Runtime observations grouped by analysis stage. Arrows organize the stages; they do not claim chronology or causality.

ObservedDerived

5 recorded facts from one runtime window. Every fact remains independently traceable in Analyst mode.

Chapter 04

Detection & Forensics

Consensus, attribution, signatures, code structure, prevalence, and identity.

Chapter 05

Safety & FAQ

Complete recovery guidance and answers for the next decision.

What to do now

This file appears low risk based on the evidence available now.

  1. Recovery step 01

    Open or run it only when its publisher and download source have been independently verified.

  2. Recovery step 02

    A clean result reduces known risk, but it cannot guarantee that every new or targeted threat has been detected.

  3. Recovery step 03

    Keep your antivirus and Windows updates switched on so you stay protected.

Safety FAQ

Direct answers grounded in the saved verdict and evidence in this report.

6 evidence-based answers
Is OptiFine_1.21.11_HD_U_J9.jar safe?
Evidence-based answer
OptiFine_1.21.11_HD_U_J9.jar appears safe. 0 of 75 antivirus engines flagged it. Open or run it only when its publisher and download source have been independently verified.
What is OptiFine_1.21.11_HD_U_J9.jar?
Evidence-based answer
OptiFine_1.21.11_HD_U_J9.jar is a Java application or archive, about 7.7 MB. Our analysis did not identify a verdict-driving threat signal. A file's name can be reused by different files, so we identify it by its cryptographic hash (below).
How many antivirus engines detected OptiFine_1.21.11_HD_U_J9.jar?
Evidence-based answer
None — 0 of 75 antivirus engines flagged OptiFine_1.21.11_HD_U_J9.jar. That's reassuring, though it is not proof that a file is safe, so we also weigh its behaviour, identity, and reputation.
What is the SHA-256 hash of OptiFine_1.21.11_HD_U_J9.jar?
Evidence-based answer
The SHA-256 hash of OptiFine_1.21.11_HD_U_J9.jar is 63a60c48b3370920e96d4c32570d7154d17b3a86654c4f1d1df418be668d3903, and its MD5 is a1ce0d17ef1fc016582a82234cccf2f1. 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.
Is it safe to open or run OptiFine_1.21.11_HD_U_J9.jar?
Evidence-based answer
Based on the recorded evidence, OptiFine_1.21.11_HD_U_J9.jar has a low observed risk. The important caveat is source: make sure you downloaded it from the official website or a trusted store, because attackers sometimes distribute malware-laced copies under a legitimate file's name. If your own antivirus flags it, verify the source and the exact hash before overriding the warning.
How up to date is this analysis of OptiFine_1.21.11_HD_U_J9.jar?
Evidence-based answer
This report reflects the scan run on May 1, 2026. Because a file's hash never changes, the identity of OptiFine_1.21.11_HD_U_J9.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.
Chapter 06

Community

Member reviews and reports for this exact file hash.

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The raw file is processed temporarily and is not retained after processing. Its hash and report are public and permanent, so the next person who checks the same file gets an instant answer. Unknown files may be submitted to VirusTotal for analysis. If you ran this file on your computer and are worried, scan your system with an up-to-date antivirus and change critical passwords from a different device.