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tstlibg64.sys

Mega Browse

Part of the Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The file tstlibg64.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 64-bit kernel mode device driver named “tStLibG64”.
Publisher:
StdLib  (signed by Mega Browse)

Product:
StdLib

Version:
1.4.3.1 built by: WinDDK

MD5:
e9c8c9162ab6051282f35a8bcdd76ef8

SHA-1:
cf6e3dc7f09cc1216fb303344a6dd9bed6635a8f

SHA-256:
09899037a1bbce3ec8e5cd69b30c1588c7b93cdd9ffeae17ee5d8c29958f695a

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:
4/25/2024 10:17:02 PM UTC  (today)

Scan engine
Detection
Engine version

Reason Heuristics
PUP.Yontoo.MegaBrow (M)
16.5.2.10

File size:
58.7 KB (60,096 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\tstlibg64.sys

Digital Signature
Signed by:
Mega Browse

Authority:
VeriSign, Inc.

Valid from:
1/21/2014 5:00:00 PM

Valid to:
1/22/2015 4:59:59 PM

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:
1/30/2014 5:46:41 PM

OS version:
6.1

OS bitness:
Win64

Subsystem:
Native (none required)

Linker version:
9.0

CTPH (ssdeep):
1536:/A0Ep72J9xc1JUzUPU/qnIy4fNwQKZzrtW+DGLA:I0G72J8YvqIy4fNwQKNrtNDGLA

Entry address:
0x10064

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, 8E, B3, FF, FF, CC, CC, D0, 00, 01, 00, 00, 00, 00, 00, 00, 00, 00, 00, 40, 05, 01, 00, 10, C0, 00, 00, C0, 00, 01, 00, 00, 00, 00, 00, 00, 00, 00, 00, 62, 05, 01, 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, 4E, 05, 01, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 3C, 02, 01, 00, 00, 00, 00, 00, 50, 02, 01, 00, 00, 00, 00, 00, 6E, 02, 01, 00...
 
[+]

Entropy:
6.4022

Code size:
45 KB (46,080 bytes)

Driver
Display name:
tStLibG64

Type:
Kernel device driver (KernelDriver)

Group:
PNP_TDI


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