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wstlib.sys

Webfuii

Part of the Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The file wstlib.sys by Webfuii has been detected as adware by 19 anti-malware scanners. It runs as a Windows kernel mode device driver named “wStLib”. 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 Webfuii)

Product:
StdLib

Version:
1.4.3.1 built by: WinDDK

MD5:
690a5371c61658b6eb41185b40323172

SHA-1:
54b5cefb69e2f470a91d2cf80caca74dcc7916b5

SHA-256:
b99213c6748b08bbb82aefc40ee3c501dd13b255084ff569c30957988afa0437

Scanner detections:
19 / 68

Status:
Adware

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

Analysis date:
4/25/2024 10:28:04 AM UTC  (today)

Scan engine
Detection
Engine version

Lavasoft Ad-Aware
Adware.Mplug.DC
562

Agnitum Outpost
PUA.Yotoon
7.1.1

AVG
Generic
2016.0.3040

Baidu Antivirus
Adware.Win32.BrowseFox
4.0.3.15723

Bitdefender
Adware.Mplug.DC
1.0.20.1020

Clam AntiVirus
Win.Adware.Swiftbrowse-79
0.98/21511

Comodo Security
TrojWare.Win32.AltBrowse.IZZV
20900

Emsisoft Anti-Malware
Adware.Mplug.DC
8.15.07.23.09

F-Prot
W32/A-c99f2d8b
v6.4.7.1.166

F-Secure
Adware.Mplug.DC
11.2015-23-07_5

G Data
Adware.Mplug.DC
15.7.25

herdProtect (fuzzy)
variant of wstlibg.sys (Adware)
2015.8.24.3

MicroWorld eScan
Adware.Mplug.DC
16.0.0.612

NANO AntiVirus
Riskware.Win32.Yotoon.ddghtt
0.30.0.65070

nProtect
Adware.Mplug.DC
15.01.30.01

Reason Heuristics
PUP.Yontoo.Webfuii (M)
15.7.23.9

Vba32 AntiVirus
AdWare.Win64.Yotoon
3.12.26.3

VIPRE Antivirus
Trojan.Win32.Generic
37102

Zillya! Antivirus
Adware.Yotoon.Win64.1
2.0.0.2049

File size:
51.7 KB (52,920 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:
Webfuii

Authority:
VeriSign, Inc.

Valid from:
10/7/2013 3:00:00 AM

Valid to:
10/8/2014 2:59:59 AM

Subject:
CN=Webfuii, OU=Digital ID Class 3 - Microsoft Software Validation v2, O=Webfuii, 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:
658C92DE4B1AFFD7A1D69F49D0D049BA

File PE Metadata
Compilation timestamp:
1/31/2014 2:45:28 AM

OS version:
6.1

OS bitness:
Win32

Subsystem:
Native (none required)

Linker version:
9.0

CTPH (ssdeep):
768:yIsHpnKHCBSqUPJHKQpkJxpKwT2bcWiJmOtX3g2rp3lnPcD9:lsHRKHLJqQpkYwTsiTtXxtED9

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:
6.3549

Code size:
37 KB (37,888 bytes)

Driver
Display name:
wStLib

Type:
Kernel device driver (KernelDriver)

Group:
PNP_TDI


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