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bestvideodownloader (installed 8-22-12 after firefox defaulted).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 (installed 8-22-12 after firefox defaulted).exe by sterkly has been detected as adware by 8 anti-malware scanners. The file has been seen being downloaded from api.kbm2.com.
Publisher:
sterkly LLC  (signed and verified)

Product:
KBM2 Installer

Version:
2.1.0.0

MD5:
59aa9fe153e817666525eab81c560de9

SHA-1:
e272c4d4d06e379309c63520be32a4c06f8ed654

SHA-256:
7dae7abc8ffd3cb5eb63c208cdd523a44a652dc0658b1ae123246e68bec0d819

Scanner detections:
8 / 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:
4/25/2024 8:11:26 PM UTC  (today)

Scan engine
Detection
Engine version

avast!
Win32:Adware-AJR [PUP]
2014.9-141016

Baidu Antivirus
Trojan.Win32.KBM
4.0.3.141016

Dr.Web
Adware.Plugin.13
9.0.1.0289

ESET NOD32
Win32/KBM (variant)
8.10538

Fortinet FortiGate
Riskware/KBM
10/16/2014

NANO AntiVirus
Riskware.Win32.Plugin.deanuz
0.28.2.62483

Reason Heuristics
PUP.Installer.sterkly.?
14.10.16.23

VIPRE Antivirus
sterkly LLC
33782

File size:
531.6 KB (544,376 bytes)

Product version:
2.1.0.0

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\web browsers & add-ons\bestvideodownloader (installed 8-22-12 after firefox defaulted).exe

Digital Signature
Signed by:
sterkly LLC

Authority:
VeriSign, Inc.

Valid from:
1/25/2012 6:00:00 PM

Valid to:
1/25/2013 5:59:59 PM

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:
7/18/2012 12:34:46 PM

OS version:
5.1

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
10.0

CTPH (ssdeep):
12288:j48rXMl6ObrTqeXHZzIe6DXyXkYoTjjGLqPM5vZX8Q4Wh:j4afO/ueXzqXyXkZjGEMRZX8Q4q

Entry address:
0x3914A

Entry point:
E8, A4, 6C, 00, 00, E9, 89, FE, FF, FF, 3B, 0D, D0, FB, 46, 00, 75, 02, F3, C3, E9, 2B, 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, 6F, 33, 00, 00, 6A, 16, 5E, 89, 30, E8, 02, 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, FC, 6D, 00, 00, 83, C4, 0C, EB, C7, FF, 75, 0C, 6A, 00, FF, 75, 08, E8, 4A, 2F, 00, 00, 83, C4, 0C, 83, 7D, 10, 00, 74, BB, 39, 75, 0C, 73, 0E, E8, 25, 33, 00, 00, 6A...
 
[+]

Entropy:
6.2676

Code size:
337.5 KB (345,600 bytes)

The file bestvideodownloader (installed 8-22-12 after firefox defaulted).exe has been seen being distributed by the following URL.

http://api.kbm2.com/DownloadLauncher.ashx?id=38

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