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bi_downloader.exe

Better Installer

Somoto Ltd.

This is the Somoto BetterInstaller, an installer that bundles applications with offers for additional 3rd party software, mostly unwanted adware, and may be installed without consent. The application bi_downloader.exe 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 Somoto BetterInstaller installer, however the file is not signed with an authenticode signature from a trusted source. It is also typically executed from an Internet Explorer cache folder. The file has been seen being downloaded from installercdn.filebulldog.com.
Publisher:
Somoto Ltd.

Product:
Better Installer

Version:
2.1

MD5:
f317fa9b2fc85e63cb426964f0b0dfdf

SHA-1:
4af210c9289a43884c83a038fedb1ba8c843df66

SHA-256:
cd29872630b2545cc2c281e1d4de9f49972260d832bcb6e00d392da1c1fd7130

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 'download manager' is also considered bundleware, a utility designed to download software (possibly legitimate or opensource) and bundle it with a number of optional offers including ad-supported utilities, toolbars, shopping comparison tools and browser extensions.

Analysis date:
2/24/2025 5:30:28 PM UTC  (today)

Scan engine
Detection
Engine version

Reason Heuristics
Win32.Generic
16.3.8.2

File size:
46.6 KB (47,748 bytes)

Product version:
2.1

File type:
Executable application (Win32 EXE)

Bundler/Installer:
Somoto BetterInstaller (using Nullsoft Install System)

Common path:
C:\users\{user}\appdata\local\microsoft\windows\temporary internet files\content.ie5\{random}\bi_downloader.exe

File PE Metadata
Compilation timestamp:
12/5/2009 11:50:46 PM

OS version:
4.0

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
6.0

CTPH (ssdeep):
768:g1cVhpQI2EQK0iPDh84nScF15GYbWjXO3XJ62APOA5yQdLQxiNqH4Ac:eQpQ5EP0ijnRTXJ6HH/BQb4Ac

Entry address:
0x323C

Entry point:
81, EC, 80, 01, 00, 00, 53, 55, 56, 33, DB, 57, 89, 5C, 24, 18, C7, 44, 24, 10, 30, 91, 40, 00, 33, F6, C6, 44, 24, 14, 20, FF, 15, 30, 70, 40, 00, 68, 01, 80, 00, 00, FF, 15, B4, 70, 40, 00, 53, FF, 15, 7C, 72, 40, 00, 6A, 08, A3, 58, 3F, 42, 00, E8, 09, 2C, 00, 00, A3, A4, 3E, 42, 00, 53, 8D, 44, 24, 34, 68, 60, 01, 00, 00, 50, 53, 68, 58, F4, 41, 00, FF, 15, 58, 71, 40, 00, 68, B8, 91, 40, 00, 68, A0, 36, 42, 00, E8, BC, 28, 00, 00, FF, 15, B0, 70, 40, 00, BF, 00, 90, 42, 00, 50, 57, E8, AA, 28, 00, 00...
 
[+]

Packer / compiler:
Nullsoft install system v2.x

Code size:
23 KB (23,552 bytes)

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

http://installercdn.filebulldog.com/.../bi_downloader.exe

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