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wstlib64.sys

KingBrowse

Part of the Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The file wstlib64.sys by KingBrowse has been detected as adware by 4 anti-malware scanners. It runs as a Windows 64-bit kernel mode device driver named “wStLib64”.
Publisher:
StdLib  (signed by KingBrowse)

Product:
StdLib

Version:
1.4.3.1 built by: WinDDK

MD5:
4d73f0d103c531cfc736eb1cbe706b1f

SHA-1:
f5ff0c618ec52daf2723e3d1d0c3c5ddafa357ce

SHA-256:
49e2d11a14df3db9b4df43ea0dc63f554a3128c9e06ea47992804ce5a712352a

Scanner detections:
4 / 68

Status:
Adware

Explanation:
Injects advertisements in the web browser in the form or banner ads and popups.

Analysis date:
4/18/2024 11:13:55 PM UTC  (a few moments ago)

Scan engine
Detection
Engine version

AVG
MalSign.Adpeak
2015.0.3494

Reason Heuristics
PUP.KingBrowse.L
14.5.10.12

Trend Micro House Call
TROJ_GEN.F47V0208
7.2.115

VIPRE Antivirus
Adware.Adpeak
26632

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\wstlib64.sys

Digital Signature
Signed by:
KingBrowse

Authority:
VeriSign, Inc.

Valid from:
1/9/2014 1:00:00 AM

Valid to:
1/10/2015 12:59:59 AM

Subject:
CN=KingBrowse, OU=Digital ID Class 3 - Microsoft Software Validation v2, O=KingBrowse, 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:
670CAB2C338090653CEA8172D5DB1E34

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:got2dxF9O8ZF33iqiIy938bWp9XcfBvJkowidIb:g9JRicy938ip9ea1j

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:
wStLib64

Type:
Kernel device driver (KernelDriver)

Group:
PNP_TDI


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