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wstlib.sys

Spring Smart

Part of the Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The file wstlib.sys by Spring Smart 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 kernel mode device driver named “wStLib”.
Publisher:
StdLib  (signed by Spring Smart)

Product:
StdLib

Version:
1.4.3.1 built by: WinDDK

MD5:
4d22e25a8100a6adea3804084cac1f69

SHA-1:
94b9d575981f7218fd7e0379c7cc635c00f1c1fb

SHA-256:
8ed8fc2349ae878d4b968fc44b673551af452275544eca2a733bd053a6b38c90

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:
4/20/2024 2:13:45 PM UTC  (today)

Scan engine
Detection
Engine version

Reason Heuristics
PUP.Yontoo (M)
17.3.14.14

File size:
51.7 KB (52,928 bytes)

Product version:
1.4.3.1

Copyright:
Copyright © 2013 StdLib

Original file name:
StdLib.sys

File type:
Driver (Win32 SYS)

Language:
English (United States)

Common path:
C:\Windows\System32\drivers\wstlib.sys

Digital Signature
Signed by:
Spring Smart

Authority:
VeriSign, Inc.

Valid from:
8/21/2013 9:00:00 PM

Valid to:
8/22/2015 8:59:59 PM

Subject:
CN=Spring Smart, OU=Digital ID Class 3 - Microsoft Software Validation v2, O=Spring Smart, 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:
5D69FD87A1BCECDB8891F45F148E34E2

File PE Metadata
Compilation timestamp:
1/30/2014 10:45:28 PM

OS version:
6.1

OS bitness:
Win32

Subsystem:
Native (none required)

Linker version:
9.0

Entry address:
0xC03E

Entry point:
8B, FF, 55, 8B, EC, E8, BD, FF, FF, FF, 5D, E9, 62, 50, FF, FF, CC, CC, 74, C1, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, BC, C4, 00, 00, C0, A0, 00, 00, B4, C0, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 12, C5, 00, 00, 00, A0, 00, 00, EC, C0, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, AE, C8, 00, 00, 38, A0, 00, 00, C4, C0, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, A6, C9, 00, 00, 10, A0, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, EA, C4, 00, 00, FE, C4, 00, 00, D6, C4...
 
[+]

Entropy:
6.3568

Code size:
37 KB (37,888 bytes)

Driver
Display name:
wStLib

Type:
Kernel device driver (KernelDriver)

Group:
PNP_TDI


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