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yontooieclientsetup.exe

Yontoo Layers Client for Internet Explorer

Yontoo Technology, Inc.

This is the installer/setup program for a Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The application yontooieclientsetup.exe by Yontoo Technology has been detected as adware by 1 anti-malware scanner with very strong indications that the file is a potential threat. This is a setup and installation application and has been known to bundle potentially unwanted software. While running, it connects to the Internet address api.yontoo.com on port 80 using the HTTP protocol.
Publisher:
Yontoo Technology, Inc.  (signed and verified)

Product:
Yontoo Layers Client for Internet Explorer

Description:
Installer

Version:
2009.4.2.1737

MD5:
bb0abe2d70fd0f3ede06d0e4ad380091

SHA-1:
e4c7d9716b112b2ca265fb00eee5da3eddd0bbb0

SHA-256:
7fc457cd8e2b46b28fc575cba0cbcd21d02d296157de12d8a0420cfcecd3d233

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:
1/13/2025 7:31:24 AM UTC  (today)

Scan engine
Detection
Engine version

Reason Heuristics
PUP.Yontoo.YontooTechnology.Installer (M)
16.2.18.20

File size:
266.3 KB (272,656 bytes)

Product version:
1.03.02

Copyright:
(c) Yontoo Technology, Inc.. All rights reserved.

File type:
Executable application (Win32 EXE)

Language:
Language Neutral

Digital Signature
Signed by:
Yontoo Technology, Inc.

Authority:
The USERTRUST Network

Valid from:
5/25/2008 2:00:00 AM

Valid to:
5/26/2009 1:59:59 AM

Subject:
CN="Yontoo Technology, Inc.", O="Yontoo Technology, Inc.", STREET=3440 Gird Rd, L=Fallbrook, S=CA, PostalCode=92028, C=US

Issuer:
CN=UTN-USERFirst-Object, OU=http://www.usertrust.com, O=The USERTRUST Network, L=Salt Lake City, S=UT, C=US

Serial number:
1C5F074DD8ACC358544B855BAD410BF5

File PE Metadata
Compilation timestamp:
3/30/2009 12:52:05 AM

OS version:
4.0

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
8.0

CTPH (ssdeep):
6144:MMzEissw7CcBrnjMMeMHyDZTxchVNOUJxulgQ:MMQinUfzeZ9chVNOngQ

Entry address:
0x15BE

Entry point:
55, 8B, EC, 81, EC, C8, 03, 00, 00, 53, 56, 57, FF, 15, 74, 30, 40, 00, 89, 45, FC, C6, 85, D0, FD, FF, FF, 00, FF, 15, 70, 30, 40, 00, A3, 00, 40, 40, 00, 8D, 85, 38, FC, FF, FF, 50, C7, 85, 38, FC, FF, FF, 94, 00, 00, 00, FF, 15, 6C, 30, 40, 00, 85, C0, 75, 21, FF, 15, 3C, 30, 40, 00, 50, 68, A0, 32, 40, 00, E8, 31, FA, FF, FF, 59, C7, 05, 04, 40, 40, 00, FF, 00, 00, 00, E9, 25, 02, 00, 00, 8B, 35, 68, 30, 40, 00, 68, 8C, 32, 40, 00, 68, 7C, 32, 40, 00, FF, D6, 50, FF, 15, 64, 30, 40, 00, 85, C0, 74, 08...
 
[+]

Entropy:
7.9579

Developed / compiled with:
Microsoft Visual C++

Code size:
7.5 KB (7,680 bytes)

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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