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665d1b77_stp.exe

Assist Point

This is the installer/setup program for a Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The application 665d1b77_stp.exe by Assist Point has been detected as adware by 11 anti-malware scanners. The program is a setup application that uses the NSIS (Nullsoft Scriptable Install System) installer. 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. It is also typically executed from the user's temporary directory.
Publisher:
Assist Point  (signed and verified)

Version:
2.0.5595.31756

MD5:
a36bc389f5dc2d9b5eb8bd27c0cad813

SHA-1:
9fb681d410db4a5a874dabe30c51730cc4fc6906

SHA-256:
cd5d18304f430b2734ff1d846d7bab2cdc14adf1f11ee0f65fff7a6e6ba6e959

Scanner detections:
11 / 68

Status:
Adware

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

Analysis date:
7/13/2025 2:56:36 PM UTC  (today)

Scan engine
Detection
Engine version

AhnLab V3 Security
PUP/Win32.BrowseFox
2015.06.02

AVG
BrowseFox
2016.0.3091

Baidu Antivirus
Adware.Win32.BrowseFox
4.0.3.1562

Bkav FE
W32.HfsAdware
1.3.0.6379

Clam AntiVirus
Win.Adware.Browsefox-725
0.98/20540

Dr.Web
Trojan.Yontoo.1781
9.0.1.05190

ESET NOD32
Win32/BrowseFox.BC potentially unwanted application
7.0.302.0

Malwarebytes
PUP.Optional.AssistPoint.A
v2015.06.02.09

Reason Heuristics
PUP.Yontoo.Installer
15.6.2.9

Sophos
PUA 'Browse Fox'
5.14

Vba32 AntiVirus
suspected of Trojan.Downloader.gen.h
3.12.26.4

File size:
292.3 KB (299,264 bytes)

Product version:
2015.04.27

File type:
Executable application (Win32 EXE)

Installer:
NSIS (Nullsoft Scriptable Install System)

Common path:
C:\users\{user}\appdata\local\temp\{random}.tmp\665d1b77_stp.exe

Digital Signature
Signed by:
Assist Point

Authority:
VeriSign, Inc.

Valid from:
3/6/2015 1:00:00 AM

Valid to:
3/6/2016 12:59:59 AM

Subject:
CN=Assist Point, O=Assist Point, L=San Diego, 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:
58FC58A52C291B337067DC6AA50B8FB3

File PE Metadata
Compilation timestamp:
6/5/2014 1:58:31 AM

OS version:
5.0

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
9.0

CTPH (ssdeep):
6144:VQ3P+RnM3DoFFjuvf/toNQ8dqLuJoU0U7Hd8CntQOHHM+HFFTjXdpNnT2x:GMnM3D0Fw/tN8dkmLtpHHHrh7K

Entry address:
0x31E4

Entry point:
81, EC, 80, 01, 00, 00, 53, 55, 56, 33, DB, 57, 89, 5C, 24, 18, C7, 44, 24, 10, E0, 73, 40, 00, 33, F6, C6, 44, 24, 14, 20, FF, 15, 30, 70, 40, 00, 68, 01, 80, 00, 00, FF, 15, B0, 70, 40, 00, 53, FF, 15, 7C, 72, 40, 00, 6A, 08, A3, B8, 6C, 44, 00, E8, 1B, 25, 00, 00, 53, 68, 60, 01, 00, 00, A3, C0, 6B, 44, 00, 8D, 44, 24, 38, 50, 53, 68, DB, 73, 40, 00, FF, 15, 58, 71, 40, 00, 68, D0, 73, 40, 00, 68, C0, 2B, 44, 00, E8, 0D, 24, 00, 00, FF, 15, AC, 70, 40, 00, 50, BF, 00, F0, 46, 00, 57, E8, FB, 23, 00, 00...
 
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Packer / compiler:
Nullsoft install system v2.x

Code size:
22.5 KB (23,040 bytes)

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

TCP (HTTP):
Connects to a23-67-243-56.deploy.static.akamaitechnologies.com  (23.67.243.56:80)

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