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21a4461e_stp.exe

Round World

This is the installer/setup program for a Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The application 21a4461e_stp.exe by Round World has been detected as adware by 12 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.
Publisher:
Round World  (signed and verified)

MD5:
6711d4f28e31ce379f7fedefcbf1e3f8

SHA-1:
c181a2984d68ebbbd40bda988e2b3399b7ae1e4e

Scanner detections:
12 / 68

Status:
Adware

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

Analysis date:
12/27/2024 8:35:13 AM UTC  (today)

Scan engine
Detection
Engine version

AhnLab V3 Security
PUP/Win32.BrowseFox
2015.03.03

Avira AntiVirus
ADWARE/BrowseFox.Gen
7.11.213.54

AVG
Generic
2016.0.3181

Baidu Antivirus
Adware.Win32.BrowseFox
4.0.3.1533

Dr.Web
Trojan.Siggen6.31097
9.0.1.062

ESET NOD32
Win32/BrowseFox.C potentially unwanted
9.11259

G Data
NSIS.Application.BrowseFox
15.3.25

K7 AntiVirus
Unwanted-Program
13.200.15134

NANO AntiVirus
Trojan.Nsis.BrowseFox.dnxihk
0.30.0.296

Reason Heuristics
PUP.Installer.Yontoo
15.3.3.18

Rising Antivirus
NS:PUF.SilenceInstaller!1.9DDF
23.00.65.15301

VIPRE Antivirus
Trojan.Win32.Generic
38068

File size:
464 KB (475,144 bytes)

File type:
Executable application (Win32 EXE)

Installer:
NSIS (Nullsoft Scriptable Install System)

Common path:
C:\Documents and Settings\{user}\Local settings\temp\{random}.tmp\21a4461e_stp.exe

Digital Signature
Signed by:
Round World

Authority:
VeriSign, Inc.

Valid from:
1/10/2015 7:00:00 PM

Valid to:
1/11/2016 6:59:59 PM

Subject:
CN=Round World, O=Round World, 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:
1E6F69E3F386155D988683D665483D02

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

OS version:
4.0

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
6.0

CTPH (ssdeep):
12288:4t9FImdfHN1s15Ap/G/8/3D0Fw/tN8dkmLtpHHHrh7g:4t9Frft6j8/z0FmcLbH1g

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:
7.9738

Packer / compiler:
Nullsoft install system v2.x

Code size:
22.5 KB (23,040 bytes)

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