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{b99c8534-7800-48fa-bd71-519a46cdc7e1}t.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}t.sys by BrowseMark has been detected as adware by 14 anti-malware scanners. It runs as a Windows kernel mode device driver named “{b99c8534-7800-48fa-bd71-519a46cdc7e1}t”. 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:
b8b66e0220f9c0b2cf11a4d6bf4d2f91

SHA-1:
3fa65ed3098e0e6a0b34e06f283cfcfbdd82de47

Scanner detections:
14 / 68

Status:
Adware

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

Analysis date:
4/25/2024 2:56:10 AM UTC  (today)

Scan engine
Detection
Engine version

Agnitum Outpost
Trojan.BPlug
7.1.1

AVG
Bromrak
2015.0.3342

Baidu Antivirus
Adware.Win32.BrowseFox
4.0.3.14923

Dr.Web
Trojan.BPlug.117
9.0.1.0266

herdProtect (fuzzy)
variant of tstlibg.sys (Adware)
2014.12.5.17

IKARUS anti.virus
PUA.RiskWare.NetFilter
t3scan.1.7.5.0

K7 AntiVirus
Riskware
13.181.12898

McAfee
Artemis!DB8FD588677C
5600.6998

NANO AntiVirus
Trojan.Win32.BPlug.dcxxfx
0.28.2.61721

Reason Heuristics
PUP.BrowseMark.k
14.9.23.14

Sophos
Browse Fox
4.98

Trend Micro House Call
Suspicious_GEN.F47V0724
7.2.266

Vba32 AntiVirus
AdWare.Win64.Yotoon
3.12.26.3

VIPRE Antivirus
Trojan.Win32.Generic
32368

File size:
53.9 KB (55,232 bytes)

Product version:
1.4.3.1

Copyright:
Copyright © 2013 StdLib

Original file name:
StdLib.sys

File type:
Driver (Win32 SYS)

Language:
English (United States)

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

Digital Signature
Signed by:
BrowseMark

Authority:
VeriSign, Inc.

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

Valid to:
2/5/2015 12:59:00 PM

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:
7/30/2014 9:33:58 PM

OS version:
6.1

OS bitness:
Win32

Subsystem:
Native (none required)

Linker version:
9.0

CTPH (ssdeep):
768:jebP7EDNtMTw/RWDjR/McKV5qEXGBJgxgZ+4AOmvtnBu6+RRchAry:qP7EJSTukuzTrGYs+JNButRyiry

Entry address:
0xA73E

Entry point:
8B, FF, 55, 8B, EC, E8, BD, FF, FF, FF, 5D, E9, CA, E3, FF, FF, CC, CC, B4, A7, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 84, AB, 00, 00, 94, 90, 00, 00, A0, A7, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, BA, AB, 00, 00, 80, 90, 00, 00, AC, A7, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, D6, AB, 00, 00, 8C, 90, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, A6, AB, 00, 00, 92, AB, 00, 00, 00, 00, 00, 00, C2, AB, 00, 00, 00, 00, 00, 00, AC, A8, 00, 00, C4, A8, 00, 00, D6, A8...
 
[+]

Code size:
36.3 KB (37,120 bytes)

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

Type:
Kernel device driver (KernelDriver)

Group:
PNP_TDI


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