Finding a file called start.js or profile.js does not automatically mean malware is present. These names can occur in legitimate projects. What matters is observed behavior and links to other indicators.
Relevant associations
In the analyzed MAYUNDO scenario, the investigation correlated scripts, .lnk shortcuts, Windows Script Host, directory context, persistence and hidden legitimate content. A coherent combination of indicators provides stronger evidence than filename matching.
What not to do
Do not run an unknown script to “test” whether it is safe, and do not delete every JavaScript file on the computer. indiscriminate deletion may break legitimate software or destroy evidence needed for investigation.
How to assess it
Record the full path, the source drive, when the file appeared and any relationship with unusual shortcuts. Check an up-to-date scanner report and look for automatic execution. If suspicious, save the report before remediation.
ANTÍDOTO approach
The V1.6.3 engine looks for behavioral relationships before increasing classification severity or taking action. This is intended to reduce false positives and protect legitimate files sharing similar names.
Related reading
- wscript.exe and cscript.exe in MAYUNDO: what do they mean?
- MAYUNDO and false positives: why a suspicious filename is not enough
A safer scan with ANTÍDOTO
If you recognize these symptoms, you can download ANTÍDOTO and run a free scan of Windows and external devices. Review the findings before deciding on remediation, which requires a license. See the licensing plans and Resource Center. Detections and outcomes depend on the individual case.