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wstlib64.sys

Browse Fox

Part of the Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The file wstlib64.sys by Browse Fox 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 “wStLib64”. 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 Browse Fox)

Product:
StdLib

Version:
1.4.3.1 built by: WinDDK

MD5:
7fb3c811ac22f05265e0e4610c8a1579

SHA-1:
fa6bfd17f6661f6dfca9737dccab2272a963dfde

SHA-256:
86ec11d8abc9df8afdf4b3a65ea6c488590727e7f88d597825f09ebc8535fbd4

Scanner detections:
1 / 68

Status:
Adware

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

Analysis date:
4/25/2024 6:02:24 AM UTC  (today)

Scan engine
Detection
Engine version

Reason Heuristics
PUP.Yontoo.BrowseFox (M)
16.1.20.4

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:
Browse Fox

Authority:
VeriSign, Inc.

Valid from:
7/30/2013 7:00:00 AM

Valid to:
7/31/2014 6:59:59 AM

Subject:
CN=Browse Fox, OU=Digital ID Class 3 - Microsoft Software Validation v2, O=Browse Fox, 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:
3DA9F504A9E9628C2224F40C9EA90C86

File PE Metadata
Compilation timestamp:
1/31/2014 7:45:30 AM

OS version:
6.1

OS bitness:
Win64

Subsystem:
Native (none required)

Linker version:
9.0

CTPH (ssdeep):
768:eot2dxF9O8ZF33iqiIy938bWp9XcfBvJkowidIvPs1Q4:e9JRicy938ip9ea1jvN4

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...
 
[+]

Entropy:
5.9628

Code size:
46.5 KB (47,616 bytes)

Driver
Display name:
wStLib64

Type:
Kernel device driver (KernelDriver)

Group:
PNP_TDI


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