Identifier / Programs / Windows
pcwutl.dll
Program Compatibility Troubleshooter Helper file version info (xCyclopedia)
LOLBAS Execute 1 ATT&CK technique 1 documented command 1 known copy with hashes
How pcwutl.dll is abused
Execute T1218.011 System Binary Proxy Execution: Rundll32
Run by rundll32.exe: pcwutl.dll,launchapplication
Each abuse is LOLBAS's category and the options and words it uses; the full write-up is on LOLBAS's page for pcwutl.dll.
1 documented command
Execute T1218.011 System Binary Proxy Execution: Rundll32 User privileges
Launch executable by calling the LaunchApplication function.
rundll32.exe pcwutl.dll,LaunchApplication {PATH:.exe}Trips 2 Sigma rules: mediumCode Execution via Pcwutl.dll by Julia Fomina, oscd.community; mediumPotentially Suspicious Rundll32 Activity by juju4, Jonhnathan Ribeiro, oscd.community, Nasreddine Bencherchali (Nextron Systems)
The command the identifier reads trips a Sigma process-creation rule. These commands and their descriptions are from LOLBAS’s entry for pcwutl.dll, by LOLBAS Team, at commit 2056cb766250 of 2026-09-26, under the GPL-3.0 and LOLBAS’s notice, with no warranty. Changed: Markdown is shown formatted. The source is in lolbas-gtfobins-commands.json.gz, and the full entry is on LOLBAS’s page for pcwutl.dll. The identifier reads it with LOLBAS’s placeholders filled in: a URL as https://example.com/file, a share as \\192.0.2.10\share\file, a path as C:\Data\file and a command as calc.exe.
What detects it
Is it the real pcwutl.dll?
C:\Windows\system32\1 known copy
10.0.19041.1 (WinBuild.160101.0800) · C:\Windows\system32\pcwutl.dll · signed by Microsoft Windows
af3e85ebc5517989e9fcb4aa1b65c5891f4280418b4b45b096fce316a755418fFrom the file’s version info and the copies recorded by xCyclopedia (MIT). A copy in another folder, signed by someone else or with another hash is not necessarily malicious, but it is worth a closer look. In Ceplin, "<sha256>".whatis() says which known copy a hash is.