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yontoosetup.exe

Yontoo

Yontoo LLC

This is the installer/setup program for a Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The application yontoosetup.exe by Yontoo has been detected as adware by 20 anti-malware scanners. This is a self-extracting archive and installer and has been known to bundle potentially unwanted software. The file has been seen being downloaded from dl-2.kbm2.com and multiple other hosts. While running, it connects to the Internet address api.yontoo.com on port 80 using the HTTP protocol.
Publisher:
Yontoo LLC  (signed and verified)

Product:
Yontoo

Description:
Installer

Version:
2013.5.21.1540

MD5:
5b4b2a705b95c18cc1a3c7d76fb2ea11

SHA-1:
8ade57c3f8cf7912704dee7674f4bf19a5f037e4

SHA-256:
41f64a3f6894b05babbf7f07c62476a27543718be616d3efd3d446e0b31a2f0b

Scanner detections:
20 / 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:
4/24/2024 1:29:12 PM UTC  (today)

Scan engine
Detection
Engine version

Agnitum Outpost
Adware.Yontoo
7.1.1

Avira AntiVirus
ADWARE/Yontoo.Gen
7.11.98.36

AVG
AdInject.Yontoo
2014.0.3543

Baidu Antivirus
Adware.Win32.Agent
4.0.3.131211

Bkav FE
W32.Clod764.Trojan
1.3.0.4562

Boost by Reason
Optional.Yontoo.L
188838

Comodo Security
ApplicUnwnt
16821

Dr.Web
Adware.Plugin.11
9.0.1.0241

ESET NOD32
Win32/Adware.Yontoo (variant)
7.8726

F-Prot
W32/Adware.AKRV
v6.4.7.1.166

IKARUS anti.virus
AdWare.Yontoo
t3scan.2.0.127

K7 AntiVirus
Adware
13.170.9377

McAfee
Artemis!B1A9C17E5529
5600.7271

MicroWorld eScan
ADWARE/Yontoo.Gen
14.0.0.990

Reason Heuristics
PUP.Installer.Yontoo.L
14.8.7.17

Rising Antivirus
Trojan.InstallRex!562A
23.00.65.13827

Trend Micro House Call
TROJ_GEN.RCBH1ET13
7.2.330

Trend Micro
BKDR_BIFROSE.BMC
10.465.26

VIPRE Antivirus
Yontoo
20864

XVirus List
Win.Detected
2.3.31

File size:
1.1 MB (1,164,704 bytes)

Product version:
2.053

Copyright:
Copyright (c) 2013 Yontoo LLC. All rights reserved.

File type:
Executable application (Win32 EXE)

Language:
Language Neutral

Common path:
C:\users\{user}\downloads\yontoosetup.exe

Digital Signature
Signed by:
Yontoo LLC

Authority:
VeriSign, Inc.

Valid from:
10/23/2012 5:00:00 PM

Valid to:
12/23/2013 3:59:59 PM

Subject:
CN=Yontoo LLC, OU=Digital ID Class 3 - Microsoft Software Validation v2, O=Yontoo LLC, L=Carlsbad, 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:
4A49FB7E6B0BCF398A1ACF39EA80D982

File PE Metadata
Compilation timestamp:
3/10/2011 6:55:32 PM

OS version:
4.0

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
8.0

CTPH (ssdeep):
24576:TtgUDaHydkbgvxM3e6XoHv8TauLZLBi/27l9FmfGv4IA6BEg:xFDFFCXW8GuLLi/2J923I1BEg

Entry address:
0x1627

Entry point:
55, 8B, EC, 81, EC, 58, 0B, 00, 00, 53, 56, 33, DB, 57, 66, 89, 9D, A8, F4, FF, FF, 89, 5D, FC, FF, 15, 74, 30, 40, 00, A3, 00, 40, 40, 00, FF, 15, 70, 30, 40, 00, 89, 45, F8, 8D, 85, B8, FC, FF, FF, 50, C7, 85, B8, FC, FF, FF, 14, 01, 00, 00, FF, 15, 6C, 30, 40, 00, 85, C0, 75, 21, FF, 15, 14, 30, 40, 00, 50, 68, 30, 34, 40, 00, E8, 40, FA, FF, FF, 59, C7, 05, 04, 40, 40, 00, FF, 00, 00, 00, E9, C5, 01, 00, 00, 68, 1C, 34, 40, 00, 68, 0C, 34, 40, 00, FF, 15, 68, 30, 40, 00, 50, FF, 15, 64, 30, 40, 00, 3B...
 
[+]

Entropy:
7.9957

Developed / compiled with:
Microsoft Visual C++

Code size:
7.5 KB (7,680 bytes)

The file yontoosetup.exe has been seen being distributed by the following 2 URLs.

http://dl-2.kbm2.com/.../yontoosetup.exe

http://dl.yontoo.com/Install/.../yontoosetup.exe

The executing file has been seen to make the following network communications in live environments.

TCP (HTTP):
Connects to wac.edgecastcdn.net  (72.21.81.13:80)

TCP (HTTP):
Connects to service.yontoo.com  (8.25.35.148:80)

TCP (HTTP):
Connects to api.yontoo.com  (8.25.35.15:80)

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