Is main.js safe?
No antivirus engine detected this tiny script, but one sandbox produced ambiguous process-injection, LSASS, and direct-IP signals that warrant cautious handling.
All 75 antivirus engines were non-detecting, including 17 tier-1 engines, and no research-intelligence source identified a malware family. However, one sandbox mapped activity to process injection, associated execution with LSASS, and recorded a direct IP contact whose reputation was not checked, so the script should not be run casually.
5a03a4bc7072776c43…43075f117f6573Recommended next actions
Before running
Do not run it until the source and publisher can be verified independently.
If you already ran it
Stop using it, scan the device, and watch for unexpected behavior or security alerts. Get a fresh copy from the developer's official site or an official app store.
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 non-detecting, including 17 tier-1 engines, and no research-intelligence source identified a malware family. However, one sandbox mapped activity to process injection, associated execution with LSASS, and recorded a direct IP contact whose reputation was not checked, so the script should not be run casually.
The strongest reassuring evidence is that 0 of 75 engines flagged the file, including all 17 reporting tier-1 engines. One completed sandbox run nevertheless mapped activity to T1055 and generated an LSASS-related heuristic, which can be associated with credential theft. The supplied details do not prove injection or an LSASS memory read, and that sandbox issued no malicious verdict. No dropped payload, persistence indicator, family consensus, or external-intelligence match corroborates those heuristics. The direct IP contact remains unresolved because no complete contacted-host reputation result is available. These conflicting signals justify caution rather than treating either the static scan or the behavioral heuristics as conclusive.
What We Detected
None of 75 antivirus engines flagged the 396-byte JavaScript file. All 17 reporting tier-1 engines, including Avast, BitDefender, ESET-NOD32, Kaspersky, and Microsoft, returned it undetected, and no malware family was identified by external research intelligence.
Threat Behavior
One sandbox run mapped activity to MITRE T1055 and generated a heuristic involving LSASS. Those are important warning signs, but the preserved evidence does not demonstrate the precise injection operation or a confirmed LSASS memory read. The run produced no malicious sandbox verdict, dropped-file hash, or persistence indicator. It also recorded a direct connection to 173.194.194.94; because the contacted-host cross-check was not completed or saved, that endpoint's reputation remains unresolved.
What To Do Now
Do not execute the script on a production system until its 396 bytes of source code have been reviewed and its origin verified. If testing is necessary, use an isolated disposable environment with endpoint protection enabled and monitor process access and network traffic.
Where this verdict could be wrong3 caveats
- The T1055 mapping and LSASS-related heuristic are meaningful counter-signals because process injection and credential access are uncommon for ordinary scripts.
- The sample contacted 173.194.194.94 directly, and the absent contactedHosts result prevents confirming whether that endpoint was reputable.
- prevalence.classification=rare_old reflects only 1 source and 1 submission, limiting reputation-based reassurance.
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 detection.
- tier1Malicious=0, with 17 tier-1 engines reporting undetected.
- behaviour.hasMaliciousSandboxVerdict=false.
- No dropped-file hashes or persistence indicators were recorded.
- YARAify, MalwareBazaar, and CIRCL returned no hits.
- One sandbox mapped activity to MITRE T1055 process injection.
- An LSASS-related credential-dumping heuristic fired.
- Direct-IP traffic to 173.194.194.94 lacks a completed reputation check.
- The file has only 1 recorded submission from 1 source.
Quarantine the file pending source-code and origin review, and do not run it on a production machine. Keep endpoint protection enabled if isolated 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
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
- 10MITRE ATT&CK techniques
- 9spawned processes
- 1network contacts
- 16filesystem & 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: Manipulated how the operating system loads code, which can redirect execution.
Moderate concern: Contained obfuscated or packed code that makes inspection harder.
Moderate concern: Communicated over a common application protocol; malware can use this for command-and-control.
Note: Collects details about your system.
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
main.js
5a03a4bc7072776c434180f1648a5e1e762da32457b3bc720643075f117f6573
01Uploaded file
Processes
Runtime execution
- ProcessObserved
Observed process
"C:\Windows\system32\wscript.exe" "C:\Users\<USER>\Desktop\main.js"
02Isolated runtime analysis - ProcessObserved
Observed process
C:\Windows\system32\wbem\wmiprvse.exe -Embedding
03Isolated runtime analysis - +1 more recorded observation in Analyst mode
Files
Created or changed
- Written fileObserved
{83f4f3f2-adab-11ef-9b36-806e6f6e6963}
\Device\{83f4f3f2-adab-11ef-9b36-806e6f6e6963}
04Isolated runtime analysis - Written fileObserved
{83f4f3f3-adab-11ef-9b36-806e6f6e6963}
\Device\{83f4f3f3-adab-11ef-9b36-806e6f6e6963}
05Isolated runtime analysis - +1 more recorded observation in Analyst mode
Network
Hosts contacted
- Contacted hostObserved
173.194.194.94
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.
- 173.194.194.94
- \Device\{83f4f3f2-adab-11ef-9b36-806e6f6e6963}
- \Device\{83f4f3f3-adab-11ef-9b36-806e6f6e6963}
- \Device\{83f4f3f4-adab-11ef-9b36-806e6f6e6963}
- \Device\{83f4f49a-adab-11ef-9b36-000ea617faf8}
- \Device\{83f4f49b-adab-11ef-9b36-000ea617faf8}
- C:\Windows\System32\config\systemprofile\AppData\Local\Microsoft\Windows\Caches\{AFBF9F1A-8EE8-4C77-AF34-C647E37CA0D9}.1.ver0x0000000000000000.db
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
- 0 / 75engines flagged
- 1sources 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 1 time from 1 source.
ProvenanceDerivedSourceSaved report factsObserved at - 04
Scanned file: main.js — 5a03a4bc7072776c434180f1648a5e1e762da32457b3bc720643075f117f6573
ProvenanceObservedSourceUploaded fileObserved at - 05
Observed process — "C:\Windows\system32\wscript.exe" "C:\Users\<USER>\Desktop\main.js"
ProvenanceObservedSourceIsolated runtime analysisObserved at - 06
Observed process — C:\Windows\system32\wbem\wmiprvse.exe -Embedding
ProvenanceObservedSourceIsolated runtime analysisObserved at - 07
File written: {83f4f3f2-adab-11ef-9b36-806e6f6e6963} — \Device\{83f4f3f2-adab-11ef-9b36-806e6f6e6963}
ProvenanceObservedSourceIsolated runtime analysisObserved at - 08
File written: {83f4f3f3-adab-11ef-9b36-806e6f6e6963} — \Device\{83f4f3f3-adab-11ef-9b36-806e6f6e6963}
ProvenanceObservedSourceIsolated runtime analysisObserved at - 09
Contacted host: 173.194.194.94 — 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.
EvidenceC:\Windows\System32\svchost.exe -k NetworkService -pSandbox 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.
Evidence173.194.194.94
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
Rarely uploaded, but has been around for a while. Often niche legitimate software or old internal tooling; not a strong malware signal on its own.
Fingerprint and provenance
- File name
- main.js
- Format
- JavaScript
- Code signing
- Not applicable to this file type
- Size
- 396 B
- Last analyzed
- Sep 22, 2026, 6:29 PM UTC
5a03a4bc7072776c434180f1648a5e1e762da32457b3bc720643075f117f6573Safety & 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 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 file and use a fresh copy from a trusted source. Get a fresh copy from the developer's official site or an official app store.
- 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 main.js safe, or is it malware?
What is main.js?
How many antivirus engines detected main.js?
I already downloaded and ran main.js — what should I do?
How do I remove main.js?
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How up to date is this analysis of main.js?
Community
Member reviews and reports for this exact file hash.