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scantack_setup.exe

Scan Tack

This is the installer/setup program for a Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The application scantack_setup.exe by Scan Tack 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. The file has been seen being downloaded from install-cdn.scantack.net. While running, it connects to the Internet address api.yontoo.com on port 80 using the HTTP protocol.
Publisher:
Scan Tack  (signed and verified)

MD5:
4fef3b643f652b7719998fd195952306

SHA-1:
c0aa044cc6bdaa126cdf4660d539b100466e5d40

SHA-256:
3233c437e934d7eb36a7e9c7624bb6a0d29f90edeb524d8ea0c96434e44ebcdd

Scanner detections:
14 / 68

Status:
Adware

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

Analysis date:
4/25/2024 6:53:52 AM UTC  (today)

Scan engine
Detection
Engine version

Avira AntiVirus
APPL/BrowseFox.Gen2
7.11.144.96

Baidu Antivirus
Adware.Win32.Agent
4.0.3.15818

Comodo Security
Application.Win32.Altbrowse.AK
18129

Dr.Web
Trojan.BPlug.35
9.0.1.0230

ESET NOD32
Win32/BrowseFox (variant)
9.9699

G Data
Win32.Application.BrowseFox
15.8.24

Kaspersky
not-a-virus:AdWare.Win32.Agent
14.0.0.1561

Malwarebytes
PUP.Optional.ScanTack.A
v2015.08.18.05

McAfee
Artemis!304EA9CA9396
5600.6669

NANO AntiVirus
Riskware.Win32.Agent.cuenda
0.28.0.59288

Reason Heuristics
PUP.Yontoo.ScanTack.Installer (M)
15.8.18.17

Rising Antivirus
NS:PUF.SilenceInstaller!1.9DDF
23.00.65.15816

SUPERAntiSpyware
Adware.BrowseFox/Variant
9684

VIPRE Antivirus
Yontoo
28390

File size:
2 MB (2,071,912 bytes)

File type:
Executable application (Win32 EXE)

Installer:
NSIS (Nullsoft Scriptable Install System)

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

Digital Signature
Signed by:
Scan Tack

Authority:
VeriSign, Inc.

Valid from:
1/22/2014 1:00:00 AM

Valid to:
1/23/2015 12:59:59 AM

Subject:
CN=Scan Tack, OU=Digital ID Class 3 - Microsoft Software Validation v2, O=Scan Tack, 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:
44D91A3142283CE62B23F23C84838B0D

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):
49152:a3F8GqJpbmg2z0g4J0z1LJOx3jqr/WgfCKYHunfBe3l8:euGodez0h0tJO1jqF6KYHioO

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)

The file scantack_setup.exe has been seen being distributed by the following URL.

http://install-cdn.scantack.net/setup.exe

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

TCP (HTTP):
Connects to wac.edgecastcdn.net  (72.21.81.13:80)

TCP (HTTP):
Connects to service.yontoo.com  (8.25.35.148:80)

TCP (HTTP):
Connects to api.yontoo.com  (8.25.35.15:80)

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