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wstlibg64.sys

kozaka

Part of the Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The file wstlibg64.sys by kozaka 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 kozaka)

Product:
StdLib

Version:
1.4.3.1 built by: WinDDK

MD5:
5ca3325a783a2ae133d8286669b50a62

SHA-1:
1c684e52d50d79bd0b5ae42247426ba97a3a6e41

SHA-256:
353614cef653f39f49b5be1e8eca00daec150b18c3cb41b86b4a73626e44b6a1

Scanner detections:
5 / 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:
4/23/2024 6:10:29 AM UTC  (today)

Scan engine
Detection
Engine version

herdProtect (fuzzy)
variant of {a6d34414-c1ea-40a6-b61e-fb2d4e4ad212}w64.sys (Adware)
2014.7.8.0

IKARUS anti.virus
AdWare.SpadeCast
t3scan.1.6.1.0

Reason Heuristics
PUP.kozaka.M
14.8.7.20

Sophos
BrowseSmart
4.98

VIPRE Antivirus
Threat.4150696
29708

File size:
59.7 KB (61,112 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:
kozaka

Authority:
VeriSign, Inc.

Valid from:
10/7/2013 2:00:00 AM

Valid to:
10/8/2014 1:59:59 AM

Subject:
CN=kozaka, OU=Digital ID Class 3 - Microsoft Software Validation v2, O=kozaka, 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:
1B38C0B5B092B91BC43EB30DCF78B962

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:jot2dxF9O8ZF33iqiIy938bWp9XcfBvJkowidIjV:j9JRicy938ip9ea1j

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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