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bestvideodownloader.exe

KBM2 Installer

sterkly LLC

Part of the Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The application bestvideodownloader.exe by sterkly has been detected as adware by 11 anti-malware scanners. The file has been seen being downloaded from api.kbm2.com.
Publisher:
sterkly LLC  (signed and verified)

Product:
KBM2 Installer

Version:
2.1.0.5

MD5:
fd46b4a264e9f9bf4445a87acf88cfe5

SHA-1:
4500e1099a09484bf8e95b5fa292a3883b25b895

SHA-256:
c8f5b2335382c0ce9365a0d3e49e7ff3591f68c50adabcdb24a519f199720b14

Scanner detections:
11 / 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:
4/26/2024 1:59:21 AM UTC  (today)

Scan engine
Detection
Engine version

Agnitum Outpost
Riskware.Agent
7.1.1

avast!
Win32:Adware-AJR [PUP]
2014.9-151210

Baidu Antivirus
Trojan.Win32.KBM
4.0.3.151210

Dr.Web
Adware.Plugin.18
9.0.1.0344

ESET NOD32
Win32/KBM (variant)
9.8949

Fortinet FortiGate
Riskware/KBM
12/10/2015

IKARUS anti.virus
PUA.KBM
t3scan.1.8.5.0

McAfee
Artemis!D937D98B132C
5600.6555

Reason Heuristics
PUP.Yontoo.sterkly.Installer (M)
15.12.10.19

Trend Micro House Call
TROJ_GEN.R047H01GV13
7.2.344

VIPRE Antivirus
sterkly LLC
22620

File size:
533.1 KB (545,912 bytes)

Product version:
2.1.0.5

Copyright:
(c) Sterkly LLC. All rights reserved.

Original file name:
KBM2.exe

File type:
Executable application (Win32 EXE)

Language:
English (United States)

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

Digital Signature
Signed by:
sterkly LLC

Authority:
VeriSign, Inc.

Valid from:
1/26/2012 7:00:00 AM

Valid to:
1/26/2013 6:59:59 AM

Subject:
CN=sterkly LLC, OU=Digital ID Class 3 - Microsoft Software Validation v2, O=sterkly LLC, 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:
136DB6717AA1462B8176971FE58FEBD6

File PE Metadata
Compilation timestamp:
1/8/2013 4:45:58 AM

OS version:
5.1

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
10.0

CTPH (ssdeep):
12288:nPSh8RbmElZtwKZn7dkoXYJhW32oiJ6kZ/o1Q8a:nPSMms7koXR32oSLZA1Q8a

Entry address:
0x397CB

Entry point:
E8, A3, 6C, 00, 00, E9, 89, FE, FF, FF, 3B, 0D, D0, FB, 46, 00, 75, 02, F3, C3, E9, 2A, 6D, 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, 6E, 33, 00, 00, 6A, 16, 5E, 89, 30, E8, 01, 73, 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, FB, 6D, 00, 00, 83, C4, 0C, EB, C7, FF, 75, 0C, 6A, 00, FF, 75, 08, E8, 49, 2F, 00, 00, 83, C4, 0C, 83, 7D, 10, 00, 74, BB, 39, 75, 0C, 73, 0E, E8, 24, 33, 00, 00, 6A...
 
[+]

Entropy:
6.2770

Code size:
339 KB (347,136 bytes)

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

http://api.kbm2.com/DownloadLauncher.ashx?cid=23

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