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{f4191bb0-3007-4fbd-b83f-cc45648f3845}w.sys

Clock Hand

Part of the Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The file {f4191bb0-3007-4fbd-b83f-cc45648f3845}w.sys by Clock Hand has been detected as adware by 27 anti-malware scanners. It runs as a Windows kernel mode device driver named “{f4191bb0-3007-4fbd-b83f-cc45648f3845}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 Clock Hand)

Product:
StdLib

Version:
1.4.4.6 built by: WinDDK

MD5:
5161023974d5f24c848e793a53ab41b1

SHA-1:
5ac7cd5b82355e45c3021c527f59df1d525cf626

SHA-256:
fc0c64606c0c51a07c5101b9173e7eee3b6bc66a8effa8bf7d69b0dbd7ee9e9d

Scanner detections:
27 / 68

Status:
Adware

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

Analysis date:
4/16/2024 2:54:33 PM UTC  (today)

Scan engine
Detection
Engine version

Lavasoft Ad-Aware
Adware.BrowseFox.V
680

Agnitum Outpost
PUA.BrowseFox
7.1.1

Avira AntiVirus
Adware/BrowseFox.A.1227
7.11.213.42

AVG
Generic
2016.0.3158

Bitdefender
Adware.BrowseFox.V
1.0.20.430

Bkav FE
W32.HfsAdware
1.3.0.6379

Clam AntiVirus
Win.Adware.Netfilter-134
0.98/21511

Comodo Security
TrojWare.Win32.AltBrowse.IZZV
21267

Dr.Web
Tool.NetFilter.313
9.0.1.086

Emsisoft Anti-Malware
Adware.BrowseFox.V
8.15.03.27.08

ESET NOD32
Win32/Komodia.A potentially unsafe (variant)
9.11256

F-Prot
W32/S-a7161e1c
v6.4.7.1.166

F-Secure
Adware.BrowseFox.V
11.2015-27-03_6

G Data
Adware.BrowseFox
15.3.25

herdProtect (fuzzy)
variant of {3b808196-ff63-49ee-b33b-efdf51723eca}w.sys (Adware)
2015.7.2.2

K7 AntiVirus
Unwanted-Program
13.200.15131

McAfee
Artemis!5161023974D5
5600.6814

MicroWorld eScan
Adware.BrowseFox.V
16.0.0.258

nProtect
Adware.BrowseFox.V
15.03.02.01

Qihoo 360 Security
HEUR/QVM00.1.Malware.Gen
1.0.0.1015

Reason Heuristics
PUP.Yontoo
15.3.27.8

Sophos
Generic PUA FK
4.98

Trend Micro House Call
TROJ_GEN.R08NC0OBM15
7.2.86

Trend Micro
TROJ_GEN.R08NC0OBM15
10.465.27

Vba32 AntiVirus
AdWare.Zaitu
3.12.26.3

VIPRE Antivirus
Trojan.Win32.Generic
38052

Zillya! Antivirus
Backdoor.CPEX.Win32.29350
2.0.0.2087

File size:
42.1 KB (43,152 bytes)

Product version:
1.4.4.6

Copyright:
Copyright © 2013 StdLib

Original file name:
StdLib.sys

File type:
Driver (Win32 SYS)

Language:
English (United States)

Common path:
C:\Windows\System32\drivers\{f4191bb0-3007-4fbd-b83f-cc45648f3845}w.sys

Digital Signature
Signed by:
Clock Hand

Authority:
VeriSign, Inc.

Valid from:
1/11/2015 2:00:00 AM

Valid to:
1/12/2016 1:59:59 AM

Subject:
CN=Clock Hand, O=Clock Hand, 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:
456A42223C623741F26F18A9D4223E47

File PE Metadata
Compilation timestamp:
2/13/2015 9:29:13 AM

OS version:
6.1

OS bitness:
Win32

Subsystem:
Native (none required)

Linker version:
9.0

CTPH (ssdeep):
768:aN0457WBZwpHs63E+X7BIrTsCEziDH+JgrVJddAERN5:OhUcpH/0+LCf7EziDHhd9RN5

Entry address:
0xA03E

Entry point:
8B, FF, 55, 8B, EC, E8, BD, FF, FF, FF, 5D, E9, 20, 70, FF, FF, CC, CC, 94, A1, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, CE, A4, 00, 00, E0, 80, 00, 00, B4, A0, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 24, A5, 00, 00, 00, 80, 00, 00, EC, A0, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, A4, A9, 00, 00, 38, 80, 00, 00, C4, A0, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 9C, AA, 00, 00, 10, 80, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, FC, A4, 00, 00, 10, A5, 00, 00, E8, A4...
 
[+]

Entropy:
6.6135

Code size:
28 KB (28,672 bytes)

Driver
Display name:
{f4191bb0-3007-4fbd-b83f-cc45648f3845}w

Type:
Kernel device driver (KernelDriver)

Group:
PNP_TDI


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