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{efcef585-5c2c-4157-968d-228963fb8b08}w64.sys

linkswift

Part of the Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The file {efcef585-5c2c-4157-968d-228963fb8b08}w64.sys by linkswift has been detected as adware by 29 anti-malware scanners. It runs as a Windows 64-bit kernel mode device driver named “{efcef585-5c2c-4157-968d-228963fb8b08}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 linkswift)

Product:
StdLib

Version:
1.4.4.6 built by: WinDDK

MD5:
b362ca60e7440102bab1bf475dd3bacc

SHA-1:
75409e82189742a8ffe06203dcbd5e2a7d24c259

SHA-256:
f84ef500c716e44b750809c140ad4c19e666e0f8b73c88ea362d9e546ce75dcd

Scanner detections:
29 / 68

Status:
Adware

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

Analysis date:
4/23/2024 12:08:49 PM UTC  (today)

Scan engine
Detection
Engine version

Lavasoft Ad-Aware
Adware.SwiftBrowse.CH
358

Agnitum Outpost
Riskware.Agent
7.1.1

AhnLab V3 Security
Win-PUP/BrowseFox.Gen
2015.01.28

Avira AntiVirus
Adware/BrowseFox.api
7.11.205.162

avast!
Win32:BrowseFox-H [PUP]
2014.9-160211

AVG
Generic
2017.0.2836

Baidu Antivirus
Adware.Win64.BrowseFox
4.0.3.16211

Bitdefender
Adware.SwiftBrowse.CH
1.0.20.210

Bkav FE
W64.HfsAdware
1.3.0.6379

Clam AntiVirus
Win.Adware.Swiftbrowse-497
0.98/20167

Dr.Web
Trojan.Yontoo.1742
9.0.1.042

Emsisoft Anti-Malware
Adware.SwiftBrowse.CH
8.16.02.11.07

ESET NOD32
Win64/BrowseFox.BC (variant)
10.10886

Fortinet FortiGate
Adware/BrowseFox
2/11/2016

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

F-Secure
Adware.SwiftBrowse.CH
11.2016-11-02_5

G Data
Adware.SwiftBrowse.CH
16.2.25

K7 AntiVirus
Adware
13.200.15209

McAfee
Artemis!C3A33BDFAFB7
5600.6492

MicroWorld eScan
Adware.SwiftBrowse.CH
17.0.0.126

Norman
Adware.SwiftBrowse.CH
11.20160211

nProtect
Adware.SwiftBrowse.CH
15.01.28.01

Qihoo 360 Security
Win32/Virus.Adware.a2b
1.0.0.1015

Reason Heuristics
PUP.Yontoo.linkswift (M)
16.2.11.19

SUPERAntiSpyware
Adware.BrowseFox/Variant
9329

Trend Micro House Call
HS_BROWSEFOX.SM
7.2.42

Trend Micro
HS_BROWSEFOX.SM
10.465.11

VIPRE Antivirus
Trojan.Win32.Generic
37036

Zillya! Antivirus
Adware.Yotoon.Win64.14
2.0.0.2048

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\{efcef585-5c2c-4157-968d-228963fb8b08}w64.sys

Digital Signature
Signed by:
linkswift

Authority:
VeriSign, Inc.

Valid from:
8/12/2013 3:00:00 AM

Valid to:
8/13/2015 2:59:59 AM

Subject:
CN=linkswift, OU=Digital ID Class 3 - Microsoft Software Validation v2, O=linkswift, 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:
3AD03D814D9E16358271D2CA8A94AB42

File PE Metadata
Compilation timestamp:
12/30/2014 8:22:56 AM

OS version:
6.1

OS bitness:
Win64

Subsystem:
Native (none required)

Linker version:
9.0

CTPH (ssdeep):
768:lr7G2EjsnyXeOUEGG0LA8tWFZuL470h6aqxcCT2kvsVRwlZD3Yq1:hFID6EGnLA8AFJTNEVmDx1

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:
6.3926

Code size:
34.5 KB (35,328 bytes)

Driver
Display name:
{efcef585-5c2c-4157-968d-228963fb8b08}w64

Type:
Kernel device driver (KernelDriver)

Group:
PNP_TDI


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