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31883749_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 31883749_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:
5bed8c9e99af8cddcae3c18e1b3df447

SHA-1:
d5c896fe0601ed244afc5876252c403301b41415

SHA-256:
1625ce5df0dc87e1f54b120fdd853396bd77a56f1a76d06ed9b4124aa8b2c7fa

Scanner detections:
14 / 68

Status:
Adware

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

Analysis date:
4/27/2024 12:53:07 AM UTC  (today)

Scan engine
Detection
Engine version

AhnLab V3 Security
PUP/Win32.BrowseFox
2014.09.23

AVG
Generic
2015.0.3343

Baidu Antivirus
Adware.Win32.BrowseFox
4.0.3.14922

Clam AntiVirus
Win.Adware.Linkular-1
0.98/19413

Dr.Web
Trojan.BPlug.181
9.0.1.05190

ESET NOD32
Win32/BrowseFox.C potentially unwanted application
7.0.302.0

G Data
NSIS.Application.BrowseFox
14.9.24

herdProtect (fuzzy)
variant of 240714_t3.exe (Adware)
2014.12.4.15

Malwarebytes
PUP.Optional.BPlug
v2014.09.22.01

Qihoo 360 Security
HEUR/Malware.QVM06.Gen
1.0.0.1015

Reason Heuristics
PUP.ClearThink.M
14.9.22.10

Rising Antivirus
NS:PUF.SilenceInstaller!1.9DDF
23.00.65.14920

Sophos
Browse Fox
4.98

VIPRE Antivirus
Threat.4150696
33120

File size:
569.2 KB (582,888 bytes)

File type:
Executable application (Win32 EXE)

Installer:
NSIS (Nullsoft Scriptable Install System)

Common path:
C:\users\{user}\appdata\local\temp\{random}.tmp\31883749_stp.exe

Digital Signature
Signed by:
ClearThink

Authority:
VeriSign, Inc.

Valid from:
8/5/2014 2:00:00 AM

Valid to:
8/6/2015 1:59:59 AM

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 11:52:01 PM

OS version:
4.0

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
6.0

CTPH (ssdeep):
12288:4N5ZxcBtyO1s15Ap/G/8/3D0Fw/tN8dkmLtpHHHrh7Zt7P:4nO6j8/z0FmcLbH1n7P

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...
 
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Packer / compiler:
Nullsoft install system v2.x

Code size:
22.5 KB (23,040 bytes)

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