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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. This is a setup and installation application and has been known to bundle potentially unwanted software. During install, it bundles potentially unwanted software on a user's computer at the same time without adequate consent. The file has been seen being downloaded from api.kbm2.com.
Publisher:
sterkly LLC  (signed and verified)

Product:
KBM2 Installer

Version:
2.5.1.0

MD5:
24375cd44152bce8bdbb38a412431d0a

SHA-1:
7d6b6938a6fca13c9571bb1e636b04c9d71f8025

SHA-256:
40115726f71b9fb9edc995dfe2545231ae2f1a69141fe09e1af926b31e23f96a

Scanner detections:
11 / 68

Status:
Adware

Explanation:
May bundle additional potentially unwanted software such as adware during setup.

Analysis date:
4/24/2024 4:47:19 AM UTC  (today)

Scan engine
Detection
Engine version

Agnitum Outpost
Riskware.Agent
7.1.1

AVG
AdInject.Sterkly
2016.0.3127

Dr.Web
Adware.Downware.1175
9.0.1.0124

Emsisoft Anti-Malware
Trojan.Win32.KBM.AMN
8.15.04.26.04

ESET NOD32
Win32/KBM (variant)
8.8374

Fortinet FortiGate
Riskware/MultiPlug
4/26/2015

F-Prot
W32/Adware.AKRY
v6.4.7.1.166

Malwarebytes
PUP.Optional.BundleInstaller.A
v2015.04.26.04

Reason Heuristics
PUP.Installer.sterkly.T
14.5.4.11

Trend Micro House Call
TROJ_GEN.F47V0319
7.2.124

VIPRE Antivirus
sterkly LLC
18100

File size:
535.1 KB (547,960 bytes)

Product version:
2.5.1.0

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\bestvideodownloader.exe

Digital Signature
Signed by:
sterkly LLC

Authority:
VeriSign, Inc.

Valid from:
1/22/2013 1:00:00 AM

Valid to:
2/22/2015 12:59:59 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:
113C6B2C72DEF110BE64B2ABBC52861E

File PE Metadata
Compilation timestamp:
3/5/2013 8:12:09 PM

OS version:
5.1

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
10.0

CTPH (ssdeep):
12288:fjw5VPp0aVBkkE/ZmJyZfY2U6/bKKFZtQkH:fjw5sanpELZfY2UcKKZtQE

Entry address:
0x39CB4

Entry point:
E8, AA, 6C, 00, 00, E9, 89, FE, FF, FF, 3B, 0D, D0, 0B, 47, 00, 75, 02, F3, C3, E9, 31, 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, 75, 33, 00, 00, 6A, 16, 5E, 89, 30, E8, 08, 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, 02, 6E, 00, 00, 83, C4, 0C, EB, C7, FF, 75, 0C, 6A, 00, FF, 75, 08, E8, 50, 2F, 00, 00, 83, C4, 0C, 83, 7D, 10, 00, 74, BB, 39, 75, 0C, 73, 0E, E8, 2B, 33, 00, 00, 6A...
 
[+]

Code size:
340.5 KB (348,672 bytes)

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

http://api.kbm2.com/DownloadLauncher.ashx?id=30

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