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maintainer.exe

esuack

Part of the Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The application maintainer.exe by esuack 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 “MaintainerSvc3.38.8461645”.
Publisher:
esuack  (signed and verified)

Version:
1.0.5568.40608

MD5:
00c21f3b0a0227c5a090a595b6521406

SHA-1:
cb7b8303f165dbff28b0932276a6a7a085c591f1

SHA-256:
a8d98b5fb07d821ea48b813c36b01c033c0db19b57decd117151ef0a438699a3

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:
2/24/2025 10:42:19 PM UTC  (today)

Scan engine
Detection
Engine version

Reason Heuristics
PUP.Yontoo (M)
17.3.3.10

File size:
125.3 KB (128,280 bytes)

Product version:
1.0.5568.40608

File type:
Executable application (Win32 EXE)

Language:
English (United States)

Common path:
C:\ProgramData\5fd2ca9d-b04a-4998-b7e8-2d30ebba8fbe\maintainer.exe

Digital Signature
Signed by:
esuack

Authority:
VeriSign, Inc.

Valid from:
4/21/2014 8:00:00 PM

Valid to:
4/22/2015 7:59:59 PM

Subject:
CN=esuack, OU=Digital ID Class 3 - Microsoft Software Validation v2, O=esuack, 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:
3E15E68E1D2AB32D262B79022F0F0D6E

File PE Metadata
Compilation timestamp:
4/1/2015 1:33:41 AM

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:
6.2069

Code size:
72.5 KB (74,240 bytes)

Service
Display name:
MaintainerSvc3.38.8461645

Type:
Win32OwnProcess

Depends on:
RPCSS


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