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{b99c8534-7800-48fa-bd71-519a46cdc7e1}w64.sys

BrowseMark

Part of the Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The file {b99c8534-7800-48fa-bd71-519a46cdc7e1}w64.sys by BrowseMark has been detected as adware by 7 anti-malware scanners. It runs as a Windows 64-bit kernel mode device driver named “{b99c8534-7800-48fa-bd71-519a46cdc7e1}w64”. It will plug into the web browser and display context-based advertisements by overwriting existing ads or by inserting new ones on various web pages.
Publisher:
StdLib  (signed by BrowseMark)

Product:
StdLib

Version:
1.4.3.1 built by: WinDDK

MD5:
25e0f96bb1bd72253a411e35772e13a9

SHA-1:
5c88f59fb5970638e05ab89af7d4e7778b581b57

SHA-256:
97e6ddf10b423a8a97aff1fff13de77929a2e0c5bcd0443efafd75f98b593353

Scanner detections:
7 / 68

Status:
Adware

Explanation:
Injects advertising in the web browser in various formats.

Analysis date:
4/24/2024 10:21:23 PM UTC  (today)

Scan engine
Detection
Engine version

AVG
Bromrak
2015.0.3404

Baidu Antivirus
Adware.Win32.BrowseFox
4.0.3.14723

IKARUS anti.virus
AdWare.SpadeCast
t3scan.1.6.1.0

Reason Heuristics
PUP.BrowseMark.m
14.7.23.14

Sophos
BrowseSmart
4.98

Trend Micro House Call
Suspicious_GEN.F47V0716
7.2.204

VIPRE Antivirus
Trojan.Win32.Generic
31520

File size:
59.7 KB (61,120 bytes)

Product version:
1.4.3.1

Copyright:
Copyright © 2013 StdLib

Original file name:
StdLib.sys

File type:
Driver (Win64 SYS)

Language:
English (United States)

Common path:
C:\Windows\System32\drivers\{b99c8534-7800-48fa-bd71-519a46cdc7e1}w64.sys

Digital Signature
Signed by:
BrowseMark

Authority:
VeriSign, Inc.

Valid from:
2/4/2014 1:00:00 AM

Valid to:
2/5/2015 12:59:59 AM

Subject:
CN=BrowseMark, OU=Digital ID Class 3 - Microsoft Software Validation v2, O=BrowseMark, L=Santa Monica, 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:
61D3176BC90758B1B3F2AF5F8E4B7075

File PE Metadata
Compilation timestamp:
1/31/2014 1:45:30 AM

OS version:
6.1

OS bitness:
Win64

Subsystem:
Native (none required)

Linker version:
9.0

CTPH (ssdeep):
768:Zot2dxF9O8ZF33iqiIy938bWp9XcfBvJkowidIvPACMe:Z9JRicy938ip9ea1jvIm

Entry address:
0xF064

Entry point:
48, 83, EC, 28, 4C, 8B, C2, 4C, 8B, C9, E8, 95, FF, FF, FF, 49, 8B, D0, 49, 8B, C9, 48, 83, C4, 28, E9, 2E, 20, FF, FF, CC, CC, 38, F2, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 1C, F6, 00, 00, 60, C1, 00, 00, 28, F1, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, BE, F9, 00, 00, 50, C0, 00, 00, D8, F0, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, B6, FA, 00, 00, 00, C0, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 9A, FA, 00, 00, 00, 00, 00, 00, 86, FA, 00, 00...
 
[+]

Code size:
46.5 KB (47,616 bytes)

Driver
Display name:
{b99c8534-7800-48fa-bd71-519a46cdc7e1}w64

Type:
Kernel device driver (KernelDriver)

Group:
PNP_TDI


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