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{a398d4bf-ac93-41b8-983d-d3185c8c4cc1}w.sys

AtuZi

Part of the Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The file {a398d4bf-ac93-41b8-983d-d3185c8c4cc1}w.sys by AtuZi has been detected as adware by 18 anti-malware scanners. It runs as a Windows kernel mode device driver named “{a398d4bf-ac93-41b8-983d-d3185c8c4cc1}w”. 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 AtuZi)

Product:
StdLib

Version:
1.4.3.1 built by: WinDDK

MD5:
387e62f0015c023b39efdbfb0dc27327

SHA-1:
4c9f57604add9d511f9429391f3c9e685308e8b8

SHA-256:
e6a4b64cfe270b677ab0d1d5d83d30969d137d7c583517c3e58d8ba102e8aa6d

Scanner detections:
18 / 68

Status:
Adware

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

Analysis date:
4/29/2024 1:15:48 PM UTC  (today)

Scan engine
Detection
Engine version

Lavasoft Ad-Aware
Adware.SwiftBrowse.AZ
914

Agnitum Outpost
PUA.Yotoon
7.1.1

AVG
Generic
2015.0.3392

Baidu Antivirus
Adware.Win32.BrowseFox
4.0.3.1485

Bitdefender
Adware.SwiftBrowse.AZ
1.0.20.1085

Dr.Web
Trojan.BPlug.123
9.0.1.0217

Emsisoft Anti-Malware
Adware.SwiftBrowse.AZ
8.14.08.05.11

F-Secure
Adware.SwiftBrowse.AZ
11.2014-05-08_3

G Data
Adware.SwiftBrowse.AZ
14.8.24

herdProtect (fuzzy)
variant of {9e891144-6b11-4b15-831d-1fc05f439ef4}w.sys (Adware)
2014.9.12.15

McAfee
Artemis!387E62F0015C
5600.7048

MicroWorld eScan
Adware.SwiftBrowse.AZ
15.0.0.651

nProtect
Adware.SwiftBrowse.AZ
14.07.30.01

Reason Heuristics
PUP.AtuZi.k
14.8.5.11

Sophos
Browse Fox
4.98

Trend Micro House Call
Suspicious_GEN.F47V0716
7.2.217

Vba32 AntiVirus
AdWare.Win64.Yotoon
3.12.26.3

VIPRE Antivirus
Threat.4150696
29800

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\{a398d4bf-ac93-41b8-983d-d3185c8c4cc1}w.sys

Digital Signature
Signed by:
AtuZi

Authority:
VeriSign, Inc.

Valid from:
4/17/2014 3:00:00 AM

Valid to:
4/18/2015 2:59:59 AM

Subject:
CN=AtuZi, OU=Digital ID Class 3 - Microsoft Software Validation v2, O=AtuZi, 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:
1095EBEC0EFD96E9E4C801DCA0909C26

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:sIsHpnKHCBSqUPJHKQpkJxpKwT2bcWiJmOtX3g2rp3lnbTN3a7:7sHRKHLJqQpkYwTsiTtXxtl3a7

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:
6.3539

Code size:
37 KB (37,888 bytes)

Driver
Display name:
{a398d4bf-ac93-41b8-983d-d3185c8c4cc1}w

Type:
Kernel device driver (KernelDriver)

Group:
PNP_TDI


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