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{91c8fa2b-6497-4e95-a795-70f08810ea4b}w64.sys

qualitink

Part of the Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The file {91c8fa2b-6497-4e95-a795-70f08810ea4b}w64.sys by qualitink has been detected as adware by 27 anti-malware scanners. It runs as a Windows 64-bit kernel mode device driver named “{91c8fa2b-6497-4e95-a795-70f08810ea4b}w64”. 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 qualitink)

Product:
StdLib

Version:
1.4.4.6 built by: WinDDK

MD5:
772bfef692e67141f06b712ba49cf4c4

SHA-1:
f51893437d3cde5cf9b7b1f0f44902edcbf5fe40

SHA-256:
7400233865caf310c9b8135624968527cf27fe22a0563bd323d69e25d5576319

Scanner detections:
27 / 68

Status:
Adware

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

Analysis date:
4/23/2024 12:36:27 PM UTC  (today)

Scan engine
Detection
Engine version

Lavasoft Ad-Aware
Adware.SwiftBrowse.CH
357

Agnitum Outpost
Riskware.Agent
7.1.1

AhnLab V3 Security
Trojan/Win64.SwiftBrowse
2014.09.23

avast!
Win32:BrowseFox-CS [PUP]
2014.9-160212

AVG
Generic
2017.0.2835

Baidu Antivirus
Adware.Win32.BrowseFox
4.0.3.16212

Bitdefender
Adware.SwiftBrowse.CH
1.0.20.215

Bkav FE
W64.HfsAdware
1.3.0.6379

Clam AntiVirus
Win.Adware.Swiftbrowse-497
0.98/21411

Dr.Web
Trojan.Yontoo.1734
9.0.1.043

Emsisoft Anti-Malware
Adware.SwiftBrowse.CH
8.16.02.12.10

ESET NOD32
Win64/BrowseFox (variant)
10.10542

F-Prot
W64/A-59c9c70a
v6.4.7.1.166

F-Secure
Adware.SwiftBrowse.CH
11.2016-12-02_6

G Data
Adware.SwiftBrowse.CH
16.2.25

K7 AntiVirus
Adware
13.202.15469

McAfee
Artemis!C515D124E11C
5600.6491

MicroWorld eScan
Adware.SwiftBrowse.CH
17.0.0.129

Norman
Adware.SwiftBrowse.CH
11.20160212

nProtect
Adware.SwiftBrowse.CH
14.10.19.01

Reason Heuristics
PUP.Yontoo.qualitink (M)
16.2.12.22

Sophos
Browse Fox
4.98

SUPERAntiSpyware
Adware.BrowseFox/Variant
9327

Trend Micro House Call
HS_BROWSEFOX.SM
7.2.43

Trend Micro
HS_BROWSEFOX.SM
10.465.12

VIPRE Antivirus
Trojan.Win32.Generic
34078

Zillya! Antivirus
Adware.Yotoon.Win64.14
2.0.0.2125

File size:
47.7 KB (48,824 bytes)

Product version:
1.4.4.6

Copyright:
Copyright © 2013 StdLib

Original file name:
StdLib.sys

File type:
Driver (Win64 SYS)

Language:
English (United States)

Common path:
C:\Windows\System32\drivers\{91c8fa2b-6497-4e95-a795-70f08810ea4b}w64.sys

Digital Signature
Signed by:
qualitink

Authority:
VeriSign, Inc.

Valid from:
9/19/2013 2:00:00 AM

Valid to:
9/20/2015 1:59:59 AM

Subject:
CN=qualitink, OU=Digital ID Class 3 - Microsoft Software Validation v2, O=qualitink, 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:
0E5E2B6947A31815C876634E7DEC4B4E

File PE Metadata
Compilation timestamp:
1/13/2015 4:33:04 PM

OS version:
6.1

OS bitness:
Win64

Subsystem:
Native (none required)

Linker version:
9.0

CTPH (ssdeep):
768:l+7G2EjsnyXeOUEGG0LA8tWFZuL470h6aqxcCT2kvsVRwlZD3t4Lw:4FID6EGnLA8AFJTNEVmDow

Entry address:
0xC064

Entry point:
48, 83, EC, 28, 4C, 8B, C2, 4C, 8B, C9, E8, 95, FF, FF, FF, 49, 8B, D0, 49, 8B, C9, 48, 83, C4, 28, E9, E2, 50, FF, FF, CC, CC, 78, C2, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 54, C6, 00, 00, A0, 91, 00, 00, 28, C1, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, DA, CA, 00, 00, 50, 90, 00, 00, D8, C0, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, D2, CB, 00, 00, 00, 90, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, B6, CB, 00, 00, 00, 00, 00, 00, A2, CB, 00, 00...
 
[+]

Entropy:
6.3928

Code size:
34.5 KB (35,328 bytes)

Driver
Display name:
{91c8fa2b-6497-4e95-a795-70f08810ea4b}w64

Type:
Kernel device driver (KernelDriver)

Group:
PNP_TDI


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