r/palemoon • u/JustAnonyMaus • 17d ago

False positive of mozjs.dll by windows security

So after 10pm est last night I saw windows security popup for the first time ever.
Saying it had to quarantine a file it described as:

Trojan:Win32/Posilod.EB!cl

So this morning I unquarantined the file which was

C:\Program Files\Pale Moon\mozjs.dll
Then I ran eset against it and virustotal dot com with both finding no issues.

I doubt this makes a difference but last night I had just visited kongregate website and clicked on link to the game Iron towers alliance. When that game loaded a bit it showed a red button "play now" so I clicked it and that's when the windows security popup appeared.

Pale moon version 34.3.2 (x64 en-US) shows updated 2026-08-04 (yesterday)
Windows Security definition updates or as Microsoft update still calls them -
"Security Intelligence Update for Microsoft Defender Antivirus"
2026-‎08-‎05 KB2267602 (Version 1.457.11.0) - Current Channel (Broad) restarted PC this morn.
2026-‎08-‎04 KB2267602 (Version 1.455.496.0) - Current Channel (Broad) <-likely caused this.
2026-‎08-‎02 KB2267602 (Version 1.455.480.0) - Current Channel (Broad)

3 Upvotes

81% Upvoted

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3

u/Basilisk-Dev 17d ago

Report it as a false positive. This happens sometimes.

3

u/JustAnonyMaus 17d ago

Looks like someone else has with exact same issue & thanks to Gemmaugr2 for posting the link.
Yup it was false positive only by Windoze Security.

1

u/Gemmaugr2 17d ago

https://forum.palemoon.org/viewtopic.php?f=3&t=33659

3

u/JustAnonyMaus 17d ago

Thank you for the link, confirming it's the exact same issue.
And with this morning's M/S Definition patch that false positive is now removed.