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maintainer.exe

grassmow

Part of the Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The application maintainer.exe by grassmow has been detected as adware by 1 anti-malware scanner with very strong indications that the file is a potential threat. It runs as a separate (within the context of its own process) windows Service named “MaintainerSvc2.31.4664277”.
Publisher:
grassmow  (signed and verified)

Version:
1.0.5717.20770

MD5:
c20241c511df13ee2b7bd2669681a5c0

SHA-1:
7797654d60ece620258cfc408134331b50747a57

SHA-256:
3e66785457b80847b2faca8fbf26c4d4af0790ea8649bdebf586a17fd3bd1537

Scanner detections:
1 / 68

Status:
Adware

Explanation:
Belongs to the Sambreel/Yontoo progam that inserts various forms of advertising in the user's web browser, installed with minimal or no user consent.

Analysis date:
2/25/2025 5:28:36 AM UTC  (today)

Scan engine
Detection
Engine version

Reason Heuristics
PUP.Yontoo (M)
17.1.14.2

File size:
125.2 KB (128,240 bytes)

Product version:
1.0.5717.20770

File type:
Executable application (Win32 EXE)

Language:
English (United States)

Common path:
C:\ProgramData\df3f9360-a3a2-443d-ba85-161336eea54e\maintainer.exe

Digital Signature
Signed by:
grassmow

Authority:
VeriSign, Inc.

Valid from:
4/22/2015 7:00:00 PM

Valid to:
6/21/2016 6:59:59 PM

Subject:
CN=grassmow, O=grassmow, L=Santa Monica, S=California, C=US

Issuer:
CN=VeriSign Class 3 Code Signing 2010 CA, OU=Terms of use at https://www.verisign.com/rpa (c)10, OU=VeriSign Trust Network, O="VeriSign, Inc.", C=US

Serial number:
6097683DE3EA69DB932CBE8A09BDCA90

File PE Metadata
Compilation timestamp:
8/27/2015 1:32:30 PM

OS version:
5.1

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
11.0

Entry address:
0x9872

Entry point:
E8, 75, 62, 00, 00, E9, 7F, FE, FF, FF, 55, 8B, EC, 81, EC, 28, 03, 00, 00, A1, 68, C2, 41, 00, 33, C5, 89, 45, FC, 83, 7D, 08, FF, 57, 74, 09, FF, 75, 08, E8, 59, 50, 00, 00, 59, 83, A5, E0, FC, FF, FF, 00, 6A, 4C, 8D, 85, E4, FC, FF, FF, 6A, 00, 50, E8, 7A, F3, FF, FF, 8D, 85, E0, FC, FF, FF, 89, 85, D8, FC, FF, FF, 8D, 85, 30, FD, FF, FF, 83, C4, 0C, 89, 85, DC, FC, FF, FF, 89, 85, E0, FD, FF, FF, 89, 8D, DC, FD, FF, FF, 89, 95, D8, FD, FF, FF, 89, 9D, D4, FD, FF, FF, 89, B5, D0, FD, FF, FF, 89, BD, CC...
 
[+]

Entropy:
6.2064

Code size:
72.5 KB (74,240 bytes)

Service
Display name:
MaintainerSvc2.31.4664277

Type:
Win32OwnProcess

Depends on:
RPCSS


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