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{8d12a420-844f-4d13-97dd-a6fd7af8d0a1}w.sys

Xaven

Part of the Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The file {8d12a420-844f-4d13-97dd-a6fd7af8d0a1}w.sys by Xaven has been detected as adware by 2 anti-malware scanners. It runs as a Windows kernel mode device driver named “{8d12a420-844f-4d13-97dd-a6fd7af8d0a1}w”.
Publisher:
StdLib  (signed by Xaven)

Product:
StdLib

Version:
1.4.3.1 built by: WinDDK

MD5:
91cece6877fc945f249e922bd2c1b4c8

SHA-1:
49cc9e12e9022a4a6c0ab530d7ad2584957839ba

SHA-256:
103a1aaa633cb685a46b360363e2b9383e1f955a5a3011b8336d1a7e185a5eba

Scanner detections:
2 / 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:
4/18/2024 7:58:20 AM UTC  (today)

Scan engine
Detection
Engine version

herdProtect (fuzzy)
variant of wstlib.sys (Adware)
2015.10.31.13

Reason Heuristics
PUP.Yontoo.Xaven (M)
15.9.4.19

File size:
51.7 KB (52,912 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\{8d12a420-844f-4d13-97dd-a6fd7af8d0a1}w.sys

Digital Signature
Signed by:
Xaven

Authority:
VeriSign, Inc.

Valid from:
10/6/2013 6:00:00 PM

Valid to:
10/7/2014 5:59:59 PM

Subject:
CN=Xaven, OU=Digital ID Class 3 - Microsoft Software Validation v2, O=Xaven, 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:
0A5CE2C650CAC6A06298CBDABAEB9E5A

File PE Metadata
Compilation timestamp:
1/30/2014 6:45:28 PM

OS version:
6.1

OS bitness:
Win32

Subsystem:
Native (none required)

Linker version:
9.0

CTPH (ssdeep):
768:ZIsHpnKHCBSqUPJHKQpkJxpKwT2bcWiJmOtX3g2rp3lnfMzB:2sHRKHLJqQpkYwTsiTtXxtUzB

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:
6.3550

Code size:
37 KB (37,888 bytes)

Driver
Display name:
{8d12a420-844f-4d13-97dd-a6fd7af8d0a1}w

Type:
Kernel device driver (KernelDriver)

Group:
PNP_TDI


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