installutil.exe

Each abuse is LOLBAS's category and the options and words it uses; the full write-up is on LOLBAS's page for installutil.exe.

InstallUtil.exe /logfile= /LogToConsole=false /U {PATH:.dll}

InstallUtil.exe /logfile= /LogToConsole=false /U {PATH:.dll}

InstallUtil.exe {REMOTEURL}

1 of the 3 commands the identifier reads trips a Sigma process-creation rule; 2 trip none. These commands and their descriptions are from LOLBAS’s entry for installutil.exe, by Oddvar Moe, 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 installutil.exe. The identifier reads each 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.

4 known copies

From 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.