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unknown.exe

KBM2 Installer

Best Download Manager

Part of the Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The application unknown.exe by Best Download Manager has been detected as adware by 1 anti-malware scanner with very strong indications that the file is a potential threat. The file has been seen being downloaded from api.kbm2.com.
Publisher:
Best Download Manager   (signed by Best Download Manager)

Product:
KBM2 Installer

Version:
2.5.1.0

MD5:
23a7b6fdc30b8df42dd76788732321e8

SHA-1:
beb1c8c4d64d6aa1c1decd62aecebe8ef253849e

SHA-256:
5584080e034582794d27c35dd3533ddd9735179bb270a99a6e8360eb37409e3c

Scanner detections:
1 / 68

Status:
Adware

Explanation:
Belongs to the Sambreel/Yontoo progam that inserts various forms of advertising in the user's web browser, installed with minimal or no user consent.

Analysis date:
4/24/2024 9:17:07 PM UTC  (today)

Scan engine
Detection
Engine version

Reason Heuristics
PUP.Yontoo (M)
16.11.14.23

File size:
537.1 KB (550,024 bytes)

Product version:
2.5.1.0

Copyright:
(c) Best Download Manager . All rights reserved.

Original file name:
KBM2.exe

File type:
Executable application (Win32 EXE)

Language:
English (United States)

Common path:
C:\users\{user}\downloads\unknown.exe

Digital Signature
Signed by:
Best Download Manager

Authority:
VeriSign, Inc.

Valid from:
7/25/2013 2:00:00 AM

Valid to:
7/26/2015 1:59:59 AM

Subject:
CN=Best Download Manager, OU=Digital ID Class 3 - Microsoft Software Validation v2, O=Best Download Manager, L=Carlsbad, 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:
5F3BBF9CAABCE7C81AB69ABF7371A064

File PE Metadata
Compilation timestamp:
8/7/2013 9:25:15 PM

OS version:
5.1

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
10.0

CTPH (ssdeep):
12288:Sgq6uX5c0RzWguzZylIAllGVytvHdKme7IZopYxQOn:SR610ZluglqytYmesZoaQa

Entry address:
0x3A3C0

Entry point:
E8, 0E, 6F, 00, 00, E9, 89, FE, FF, FF, 3B, 0D, D0, 0B, 47, 00, 75, 02, F3, C3, E9, 95, 6F, 00, 00, 8B, FF, 55, 8B, EC, 56, 8B, 75, 14, 85, F6, 75, 04, 33, C0, EB, 61, 83, 7D, 08, 00, 75, 13, E8, D9, 35, 00, 00, 6A, 16, 5E, 89, 30, E8, 6C, 75, 00, 00, 8B, C6, EB, 48, 83, 7D, 10, 00, 74, 16, 39, 75, 0C, 72, 11, 56, FF, 75, 10, FF, 75, 08, E8, 66, 70, 00, 00, 83, C4, 0C, EB, C7, FF, 75, 0C, 6A, 00, FF, 75, 08, E8, B4, 31, 00, 00, 83, C4, 0C, 83, 7D, 10, 00, 74, BB, 39, 75, 0C, 73, 0E, E8, 8F, 35, 00, 00, 6A...
 
[+]

Entropy:
6.2046

Code size:
342.5 KB (350,720 bytes)

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

http://api.kbm2.com/downloadLauncher.ashx?cid=369

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