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irsformw4-setup.exe

Web Install

This installer uses the CNET Download.com download manager (private label) in order to provide monetized offerings to end users. These offers could include ad-supported toolbars or various web browser extensions. The application irsformw4-setup.exe by Web Install has been detected as adware by 1 anti-malware scanner with very strong indications that the file is a potential threat. The program is a setup application that uses the DownloadCom Spot Install installer. The file has been seen being downloaded from files.webinstall.com.
Publisher:
Web Install  (signed and verified)

MD5:
1944737054ed79f192a9c9e696d792cf

SHA-1:
20ffe202fadc905334f396fb6d0530ed05275422

SHA-256:
2ade18be691373e012a6d277c4b8eb1a2929c0100ff89b64821e643c4179ebc6

Scanner detections:
1 / 68

Status:
Adware

Note:
Our current pool of anti-malware engines have not currently detected this file, however based on our own detection heuristics we feel that this file is unwanted.

Description:
This is an installer which may bundle legitimate applications with offers for additional 3rd-party applications that may be unwanted by the user. While the installer contains an 'opt-out' feature this is not set be defult and is usually overlooked.

Analysis date:
11/5/2024 8:29:05 AM UTC  (today)

Scan engine
Detection
Engine version

Reason Heuristics
PUP.CBS.WebInsta.Bundler (M)
16.5.11.9

File size:
640.5 KB (655,872 bytes)

File type:
Executable application (Win32 EXE)

Bundler/Installer:
DownloadCom Spot Install (using Nullsoft Install System)

Language:
Language Neutral

Common path:
C:\users\{user}\appdata\local\microsoft\windows\inetcache\ie\{random}\irsformw4-setup.exe

Digital Signature
Signed by:
Web Install

Authority:
VeriSign, Inc.

Valid from:
3/19/2013 5:00:00 PM

Valid to:
3/19/2016 4:59:59 PM

Subject:
CN=Web Install, OU=Digital ID Class 3 - Microsoft Software Validation v2, O=Web Install, L=SAN FRANCISCO, 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:
6F93708E2A9DB00DA7666A9EA9A5FA00

File PE Metadata
Compilation timestamp:
6/22/2012 11:07:51 AM

OS version:
5.1

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
10.0

CTPH (ssdeep):
12288:vXNRmR4TUPiaOP/SYG25CHFpJfMwp71q4OVNx6fRWH5Gu/:vX44UDOS20vtMwZ1BENx8WZl

Entry address:
0x333B

Entry point:
81, EC, 80, 01, 00, 00, 53, 55, 56, 33, DB, 57, 89, 5C, 24, 18, C7, 44, 24, 10, B0, 73, 40, 00, 33, F6, C6, 44, 24, 14, 20, FF, 15, 30, 70, 40, 00, 68, 01, 80, 00, 00, FF, 15, C0, 70, 40, 00, 53, FF, 15, 88, 72, 40, 00, 6A, 08, A3, B8, 3C, 42, 00, E8, 2C, 25, 00, 00, 53, 68, 60, 01, 00, 00, A3, C0, 3B, 42, 00, 8D, 44, 24, 38, 50, 53, 68, 43, 74, 40, 00, FF, 15, 64, 71, 40, 00, 68, 38, 74, 40, 00, 68, C0, 33, 42, 00, E8, 1D, 24, 00, 00, FF, 15, BC, 70, 40, 00, 50, BF, 00, 90, 42, 00, 57, E8, 0B, 24, 00, 00...
 
[+]

Entropy:
7.9446

Packer / compiler:
Nullsoft install system v2.x

Code size:
23 KB (23,552 bytes)

The file irsformw4-setup.exe has been seen being distributed by the following URL.

http://files.webinstall.com/download/.../dl?s=sokrati&c=semseous&variation=&brand=Download.com&pid=dlcom_sem&aid=soksid&bc=307130&country=US&cb=-1413282143

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