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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 19 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:
Round World  (signed and verified)

MD5:
19d09ce58f093e529d5911229cdfbaea

SHA-1:
684807adad6147d7ba52972d5ac0012239950a79

SHA-256:
eee45d11e52c4ebfd1a877ebd618923da348a8b8181fbd9d6c8d2cbee8bf4702

Scanner detections:
19 / 68

Status:
Adware

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

Analysis date:
4/26/2024 1:45:44 PM UTC  (today)

Scan engine
Detection
Engine version

AhnLab V3 Security
PUP/Win32.BrowseFox
2015.02.28

Avira AntiVirus
ADWARE/BrowseFox.Gen
7.11.212.236

AVG
BrowseFox.H
2016.0.3179

Baidu Antivirus
Adware.Win32.BrowseFox
4.0.3.1535

Dr.Web
Trojan.BPlug.181
9.0.1.064

ESET NOD32
Win32/BrowseFox.C potentially unwanted
9.11246

Fortinet FortiGate
Riskware/BrowseFox
3/5/2015

F-Prot
W32/S-b5aa130f
v6.4.7.1.166

G Data
NSIS.Application.BrowseFox
15.3.25

IKARUS anti.virus
AdWare.BrowseFox
t3scan.1.8.6.0

K7 AntiVirus
Unwanted-Program
13.1915114

Malwarebytes
PUP.Optional.BPlug
v2015.03.05.09

McAfee
Artemis!19D09CE58F09
5600.6835

NANO AntiVirus
Trojan.Win32.BPlug.dfsehz
0.30.0.296

Qihoo 360 Security
HEUR/QVM42.0.Malware.Gen
1.0.0.1015

Reason Heuristics
PUP.Installer.Yontoo
15.3.5.21

Rising Antivirus
NS:PUF.SilenceInstaller!1.9DDF
23.00.65.15303

Vba32 AntiVirus
AdWare.MSIL.Swift
3.12.26.3

VIPRE Antivirus
Trojan.Win32.Generic
37984

File size:
569.4 KB (583,104 bytes)

File type:
Executable application (Win32 EXE)

Installer:
NSIS (Nullsoft Scriptable Install System)

Common path:
C:\users\{user}\appdata\local\temp\{random}.tmp\21a4461e_stp.exe

Digital Signature
Signed by:
Round World

Authority:
VeriSign, Inc.

Valid from:
1/10/2015 4:00:00 PM

Valid to:
1/11/2016 3:59:59 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 2:52:01 PM

OS version:
4.0

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
6.0

CTPH (ssdeep):
12288:OXhvHN21s15Ap/G/8/3D0Fw/tN8dkmLtpHHHrh7OCEUNPgiyxF:OX9N26j8/z0FmcLbH1OC1NPPyxF

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:
7.9815

Packer / compiler:
Nullsoft install system v2.x

Code size:
22.5 KB (23,040 bytes)

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