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wstlib.sys

ResultsAlpha

Part of the Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The file wstlib.sys by ResultsAlpha has been detected as adware by 10 anti-malware scanners. It runs as a Windows kernel mode device driver named “wStLib”.
Publisher:
StdLib  (signed by ResultsAlpha)

Product:
StdLib

Version:
1.4.3.1 built by: WinDDK

MD5:
4381fec916b5e0644dbcab3814df7494

SHA-1:
84cc7af83e1d09908d9cfcb78f3c1011f0b41915

SHA-256:
0bd1331ad32bb3fb3200a57f420fe0e639c602fe782f839d613e034af0f258ee

Scanner detections:
10 / 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:
4/24/2024 9:46:44 PM UTC  (today)

Scan engine
Detection
Engine version

Lavasoft Ad-Aware
Adware.SwiftBrowse.J
953

AVG
Generic
2015.0.3431

Bitdefender
Adware.SwiftBrowse.J
1.0.20.890

Emsisoft Anti-Malware
Adware.SwiftBrowse
8.14.06.27.10

F-Secure
Adware.SwiftBrowse.J
11.2014-27-06_6

G Data
Adware.SwiftBrowse
14.6.24

MicroWorld eScan
Adware.SwiftBrowse.J
15.0.0.534

nProtect
Adware.SwiftBrowse.J
14.06.27.01

Reason Heuristics
PUP.ResultsAlpha.J
14.8.8.0

VIPRE Antivirus
Threat.4150696
29708

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:
ResultsAlpha

Authority:
VeriSign, Inc.

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

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

Subject:
CN=ResultsAlpha, OU=Digital ID Class 3 - Microsoft Software Validation v2, O=ResultsAlpha, 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:
469743F6036CB7B569DBDE100D5C126B

File PE Metadata
Compilation timestamp:
1/31/2014 1:45:28 AM

OS version:
6.1

OS bitness:
Win32

Subsystem:
Native (none required)

Linker version:
9.0

CTPH (ssdeep):
768:QIsHpnKHCBSqUPJHKQpkJxpKwT2bcWiJmOtX3g2rp3lnryHrE:nsHRKHLJqQpkYwTsiTtXxtyrE

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...
 
[+]

Code size:
37 KB (37,888 bytes)

Driver
Display name:
wStLib

Type:
Kernel device driver (KernelDriver)

Group:
PNP_TDI


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