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{bcd08fc8-cb56-41a3-8b19-3c556687a504}gw.sys

ClearThink

Part of the Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The file {bcd08fc8-cb56-41a3-8b19-3c556687a504}gw.sys by ClearThink has been detected as adware by 20 anti-malware scanners. It runs as a Windows kernel mode device driver named “{bcd08fc8-cb56-41a3-8b19-3c556687a504}Gw”. 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 ClearThink)

Product:
StdLib

Version:
1.4.4.6 built by: WinDDK

MD5:
8b3ae691ba9d4f0182d72940d912619f

SHA-1:
cf7ad1af218cb063d30d29783130c4fdc2f35231

SHA-256:
0406a28e324e3552183552439fb0f4a56b948db67dfccb8db1775780ff89c9be

Scanner detections:
20 / 68

Status:
Adware

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

Analysis date:
4/25/2024 5:34:59 AM UTC  (today)

Scan engine
Detection
Engine version

Lavasoft Ad-Aware
Adware.BrowseFox.V
775

Agnitum Outpost
PUA.BrowseFox
7.1.1

Avira AntiVirus
Adware/BrowseFox.A.1227
7.11.192.172

AVG
Generic
2015.0.3253

Baidu Antivirus
Adware.Win32.BrowseFox
4.0.3.141222

Bitdefender
Adware.BrowseFox.V
1.0.20.1780

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

Comodo Security
TrojWare.Win32.AltBrowse.IZZV
20283

Dr.Web
Tool.NetFilter.313
9.0.1.0356

ESET NOD32
Win32/RiskWare.NetFilter (variant)
8.10829

F-Prot
W32/A-76f53fd6
v6.4.7.1.166

F-Secure
Adware.BrowseFox.V
11.2014-22-12_2

G Data
Adware.BrowseFox
14.12.24

MicroWorld eScan
Adware.BrowseFox.V
15.0.0.1068

NANO AntiVirus
Riskware.Win32.NetFilter.dgkdox
0.28.6.63850

nProtect
Adware.BrowseFox.V
14.12.03.01

Reason Heuristics
PUP.ClearThink.l
14.12.22.3

Vba32 AntiVirus
AdWare.Win64.Yotoon
3.12.26.3

VIPRE Antivirus
Trojan.Win32.Generic
35432

Zillya! Antivirus
Backdoor.CPEX.Win32.29350
2.0.0.1999

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)

Common path:
C:\Windows\System32\drivers\{bcd08fc8-cb56-41a3-8b19-3c556687a504}gw.sys

Digital Signature
Signed by:
ClearThink

Authority:
VeriSign, Inc.

Valid from:
10/9/2014 3:00:00 AM

Valid to:
8/6/2015 2:59:59 AM

Subject:
CN=ClearThink, O=ClearThink, 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:
59B72B1DB71CE323997B1EAF80E12AAE

File PE Metadata
Compilation timestamp:
12/2/2014 1:46:59 AM

OS version:
6.1

OS bitness:
Win32

Subsystem:
Native (none required)

Linker version:
9.0

CTPH (ssdeep):
768:fN0457WBZwpHs63E+X7BIrTsCEziDH+JgrVJddv/:FhUcpH/0+LCf7EziDHhdx

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:
6.6155

Code size:
28 KB (28,672 bytes)

Driver
Display name:
{bcd08fc8-cb56-41a3-8b19-3c556687a504}Gw

Type:
Kernel device driver (KernelDriver)

Group:
PNP_TDI


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