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tstlib.sys

Mega Browse

Part of the Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The file tstlib.sys by Mega Browse has been detected as adware by 1 anti-malware scanner with very strong indications that the file is a potential threat. It runs as a Windows kernel mode device driver named “tStLib”.
Publisher:
StdLib  (signed by Mega Browse)

Product:
StdLib

Version:
1.4.3.1 built by: WinDDK

MD5:
36de1af93bc230bf7a50951d317df1ae

SHA-1:
c317fe89b9e2a8650a343902e9d359331742f011

SHA-256:
f500296801ef6f12c75dcdadae1f3d1a785d0cc63f4d060b98d8d6e7a05207fd

Scanner detections:
1 / 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:
11/27/2024 1:28:53 AM UTC  (today)

Scan engine
Detection
Engine version

Reason Heuristics
PUP.Yontoo.MegaBrow (M)
16.5.31.21

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\tstlib.sys

Digital Signature
Signed by:
Mega Browse

Authority:
VeriSign, Inc.

Valid from:
1/22/2014 1:00:00 AM

Valid to:
1/23/2015 12:59:59 AM

Subject:
CN=Mega Browse, OU=Digital ID Class 3 - Microsoft Software Validation v2, O=Mega Browse, L=San Diego, 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:
151F3F44EFA5ADB264205FBF9F779B3D

File PE Metadata
Compilation timestamp:
1/31/2014 1:46:38 AM

OS version:
6.1

OS bitness:
Win32

Subsystem:
Native (none required)

Linker version:
9.0

CTPH (ssdeep):
768:V2bP7EDNtMTw/RWDjR/McKV5qEXGBJgxgZ+4AOmvtnBU6+RRIN:kP7EJSTukuzTrGYs+JNBUtR8

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:
tStLib

Type:
Kernel device driver (KernelDriver)

Group:
PNP_TDI


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