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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 26 anti-malware scanners. It will plug into the web browser and display context-based advertisements by overwriting existing ads or by inserting new ones on various web pages.
Publisher:
esuack  (signed and verified)

Version:
1.0.5581.23496

MD5:
9c56442ec5200e4cc139d282d13aa6ed

SHA-1:
7af0d2d54ced7c4598d368d4639805a7a9991202

SHA-256:
381b39c3c7e8ed98a676be241fbadeac40767dcf23ef224645ef989156f9c71f

Scanner detections:
26 / 68

Status:
Adware

Explanation:
Injects advertising in the web browser in various formats.

Analysis date:
2/8/2026 1:06:43 AM UTC  (today)

Scan engine
Detection
Engine version

Lavasoft Ad-Aware
Gen:Variant.Adware.Graftor.163020
5675496

Agnitum Outpost
Riskware.Agent
7.1.1

AhnLab V3 Security
PUP/Win32.BrowseFox
2015.04.14

avast!
MSIL:BrowseFox-BJ [PUP]
150319-1

AVG
Adware AdPlugin.CWT
2014.0.4311

Baidu Antivirus
Adware.Win32.BrowseFox
4.0.3.15414

Bitdefender
Gen:Variant.Adware.Graftor.163020
1.0.20.520

Bkav FE
W32.HfsAdware
1.3.0.6379

Clam AntiVirus
Win.Adware.Agent-41785
0.98/21511

Dr.Web
Trojan.Yontoo.1734
9.0.1.05190

Emsisoft Anti-Malware
Gen:Variant.Adware.Graftor.163020
9.0.0.4799

ESET NOD32
Win32/BrowseFox.V potentially unwanted application
7.0.302.0

F-Prot
W32/S-11fc74d1
v6.4.7.1.166

F-Secure
Gen:Variant.Adware.Graftor
5.13.68

G Data
Gen:Variant.Adware.Graftor.163020
15.4.25

herdProtect (fuzzy)
variant of maintainer.bak (Adware)
2015.7.15.19

IKARUS anti.virus
PUA.BrowseFox
t3scan.1.8.9.0

K7 AntiVirus
Adware
13.202.15581

MicroWorld eScan
Gen:Variant.Adware.Graftor.163020
16.0.0.312

NANO AntiVirus
Trojan.Win32.Yontoo.dpmcsm
0.30.16.1110

Norman
Gen:Variant.Adware.Graftor.163020
03.12.2014 13:20:04

Reason Heuristics
PUP.esuack
15.4.13.20

Sophos
Browse Fox
4.98

Vba32 AntiVirus
AdWare.SwiftBrowse
3.12.26.3

VIPRE Antivirus
Threat.4741131
38950

Zillya! Antivirus
Adware.Agent.Win32.52012
2.0.0.2138

File size:
125.3 KB (128,280 bytes)

Product version:
1.0.5581.23496

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:
4/22/2014 2:00:00 AM

Valid to:
4/23/2015 1:59:59 AM

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:
4/13/2015 10:03:21 PM

OS version:
5.1

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
11.0

CTPH (ssdeep):
3072:uD1Ll2ZpujSiZF4gjsym2UG0IHhxDOMdVhE:uBVDFH+KuMfO

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...
 
[+]

Code size:
72.5 KB (74,240 bytes)

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