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406b1120_stp.exe

ClearThink

This is the installer/setup program for a Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The application 406b1120_stp.exe by ClearThink has been detected as adware by 14 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:
ClearThink  (signed and verified)

MD5:
ace6601b67f45bb3e7ce703b9dad8634

SHA-1:
3bb6c41486b25bee1d7613f8f19f232455bd97c8

SHA-256:
38b78d66edab8cd8ec19e972cb31b9f3ed1be5a541744afa7e090cfae5f4591b

Scanner detections:
14 / 68

Status:
Adware

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

Analysis date:
4/25/2024 11:43:22 AM UTC  (today)

Scan engine
Detection
Engine version

AhnLab V3 Security
PUP/Win32.BrowseFox
2014.09.25

AVG
Generic
2015.0.3314

Baidu Antivirus
Adware.Win32.BrowseFox
4.0.3.141021

Dr.Web
Trojan.BPlug.181
9.0.1.0294

ESET NOD32
Win32/BrowseFox
8.10462

G Data
NSIS.Application.BrowseFox
14.10.24

Malwarebytes
PUP.Optional.BPlug
v2014.10.21.11

McAfee
Artemis!ACE6601B67F4
5600.6970

Qihoo 360 Security
HEUR/Malware.QVM06.Gen
1.0.0.1015

Reason Heuristics
PUP.ClearThink.M
14.10.21.23

Rising Antivirus
NS:PUF.SilenceInstaller!1.9DDF
23.00.65.141019

Sophos
Browse Fox
4.98

Trend Micro House Call
Suspicious_GEN.F47V0919
7.2.294

VIPRE Antivirus
Trojan.Win32.Generic
33416

File size:
569.2 KB (582,872 bytes)

File type:
Executable application (Win32 EXE)

Installer:
NSIS (Nullsoft Scriptable Install System)

Common path:
C:\users\{user}\appdata\local\temp\{random}.tmp\406b1120_stp.exe

Digital Signature
Signed by:
ClearThink

Authority:
VeriSign, Inc.

Valid from:
8/4/2014 7:00:00 PM

Valid to:
8/5/2015 6:59:59 PM

Subject:
CN=ClearThink, O=ClearThink, 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:
1200063ED04B1DA36F7FE204B3DD8617

File PE Metadata
Compilation timestamp:
12/5/2009 4:52:01 PM

OS version:
4.0

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
6.0

CTPH (ssdeep):
12288:aquBNY1mtQ1s15Ap/G/8/3D0Fw/tN8dkmLtpHHHrh7pvxNJiO09It:ag1mC6j8/z0FmcLbH1lxNJ1090

Entry address:
0x30CB

Entry point:
81, EC, 80, 01, 00, 00, 53, 55, 56, 33, DB, 57, 89, 5C, 24, 18, C7, 44, 24, 10, 60, 91, 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, 38, 6F, 44, 00, E8, F1, 2B, 00, 00, A3, 84, 6E, 44, 00, 53, 8D, 44, 24, 34, 68, 60, 01, 00, 00, 50, 53, 68, 30, 9C, 42, 00, FF, 15, 58, 71, 40, 00, 68, 54, 91, 40, 00, 68, 80, 2E, 44, 00, E8, A4, 28, 00, 00, FF, 15, AC, 70, 40, 00, BF, 00, F0, 46, 00, 50, 57, E8, 92, 28, 00, 00...
 
[+]

Entropy:
7.9812

Packer / compiler:
Nullsoft install system v2.x

Code size:
22.5 KB (23,040 bytes)

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