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{ef8714df-a44b-464c-9034-549a70dc4cd7}gt.sys

maucampo

Part of the Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The file {ef8714df-a44b-464c-9034-549a70dc4cd7}gt.sys by maucampo has been detected as adware by 17 anti-malware scanners. It runs as a Windows kernel mode device driver named “{ef8714df-a44b-464c-9034-549a70dc4cd7}Gt”. 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 maucampo)

Product:
StdLib

Version:
1.4.3.1 built by: WinDDK

MD5:
b563e4b70102fe98513b7f8bf4686561

SHA-1:
89a39b6ed1a3abe19099d63e96a0913f9bde4280

Scanner detections:
17 / 68

Status:
Adware

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

Analysis date:
4/20/2024 4:07:08 AM UTC  (today)

Scan engine
Detection
Engine version

Agnitum Outpost
PUA.Yotoon
7.1.1

Avira AntiVirus
Adware/SpadeCast.A.282
7.11.170.42

avast!
Win32:BrowseFox-HT [PUP]
2014.9-160203

AVG
Zebrar
2017.0.2845

Baidu Antivirus
Adware.Win32.BrowseFox
4.0.3.1623

Bkav FE
W32.HfsAdware
1.3.0.6379

Clam AntiVirus
Win.Adware.Agent-12778
0.98/21511

Comodo Security
TrojWare.Win32.AltBrowse.IZZV
21372

Dr.Web
Trojan.BPlug.117
9.0.1.034

F-Prot
W32/A-caf5c463
v6.4.7.1.166

IKARUS anti.virus
PUA.RiskWare.NetFilter
t3scan.1.7.5.0

NANO AntiVirus
Trojan.Win32.BPlug.dcxxfx
0.28.2.61721

Reason Heuristics
PUP.Yontoo.maucampo (M)
16.2.3.0

Sophos
BrowseSmart
4.98

Vba32 AntiVirus
AdWare.Yotoon
3.12.26.3

VIPRE Antivirus
Yontoo
32676

Zillya! Antivirus
Adware.Yotoon.Win64.6
2.0.0.1906

File size:
53.9 KB (55,224 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\{ef8714df-a44b-464c-9034-549a70dc4cd7}gt.sys

Digital Signature
Signed by:
maucampo

Authority:
VeriSign, Inc.

Valid from:
11/27/2013 1:00:00 AM

Valid to:
11/28/2014 12:59:59 AM

Subject:
CN=maucampo, OU=Digital ID Class 3 - Microsoft Software Validation v2, O=maucampo, 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:
40BF170484E09DB904849DB86C86A494

File PE Metadata
Compilation timestamp:
1/31/2014 1:46:38 AM

OS version:
6.1

OS bitness:
Win32

Subsystem:
Native (none required)

Linker version:
9.0

CTPH (ssdeep):
768:VXbP7EDNtMTw/RWDjR/McKV5qEXGBJgxgZ+4AOmvtnBU6+RR8+:lP7EJSTukuzTrGYs+JNBUtRj

Entry address:
0xA73E

Entry point:
8B, FF, 55, 8B, EC, E8, BD, FF, FF, FF, 5D, E9, CA, E3, FF, FF, CC, CC, B4, A7, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 84, AB, 00, 00, 94, 90, 00, 00, A0, A7, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, BA, AB, 00, 00, 80, 90, 00, 00, AC, A7, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, D6, AB, 00, 00, 8C, 90, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, A6, AB, 00, 00, 92, AB, 00, 00, 00, 00, 00, 00, C2, AB, 00, 00, 00, 00, 00, 00, AC, A8, 00, 00, C4, A8, 00, 00, D6, A8...
 
[+]

Code size:
36.3 KB (37,120 bytes)

Driver
Display name:
{ef8714df-a44b-464c-9034-549a70dc4cd7}Gt

Type:
Kernel device driver (KernelDriver)

Group:
PNP_TDI


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