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wstlibg64.sys

raving reyven

Part of the Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The file wstlibg64.sys by raving reyven has been detected as adware by 5 anti-malware scanners. It runs as a Windows 64-bit kernel mode device driver named “wStLibG64”.
Publisher:
StdLib  (signed by raving reyven)

Product:
StdLib

Version:
1.4.3.1 built by: WinDDK

MD5:
1eb9cddcb1ac257a9205f84b22d0d5da

SHA-1:
bf791bfa76efef832a2aebd0406e78a9899ad1f6

SHA-256:
08c62bcbfe93c13e4a724ca7755d058ffaaae550510498b77aa284006149bc1e

Scanner detections:
5 / 68

Status:
Adware

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

Analysis date:
5/4/2025 10:32:10 PM UTC  (today)

Scan engine
Detection
Engine version

AVG
MalSign.Adpeak
2015.0.3498

Reason Heuristics
Threat.Win.Reputation.IMP
14.4.20.22

Sophos
BrowseSmart
4.98

Trend Micro House Call
TROJ_GEN.F47V0208
7.2.110

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\wstlibg64.sys

Digital Signature
Signed by:
raving reyven

Authority:
VeriSign, Inc.

Valid from:
1/23/2014 1:00:00 AM

Valid to:
1/24/2015 12:59:59 AM

Subject:
CN=raving reyven, OU=Digital ID Class 3 - Microsoft Software Validation v2, O=raving reyven, 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:
1F869F0BA331D57B7D5A549783E5CA43

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:Hot2dxF9O8ZF33iqiIy938bWp9XcfBvJkowidIfDq0:H9JRicy938ip9ea1jR

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:
wStLibG64

Type:
Kernel device driver (KernelDriver)

Group:
PNP_TDI


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