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{2ac4981b-bb31-49d4-9706-b07c78762883}w64.sys

grassmow

Part of the Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The file {2ac4981b-bb31-49d4-9706-b07c78762883}w64.sys by grassmow has been detected as adware by 26 anti-malware scanners. It runs as a Windows 64-bit kernel mode device driver named “{2ac4981b-bb31-49d4-9706-b07c78762883}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 grassmow)

Product:
StdLib

Version:
1.4.3.1 built by: WinDDK

MD5:
3f2fc27bcf618ca97bd14729f2438556

SHA-1:
c13bb3e5f78fd6463a8cbf7ab3f9df16f19638d5

SHA-256:
c0a10733c5a51cf17046c0523ca5bb7ad197954699c167f1ebdc6c6d04922273

Scanner detections:
26 / 68

Status:
Adware

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

Analysis date:
4/25/2024 3:17:44 PM UTC  (today)

Scan engine
Detection
Engine version

Lavasoft Ad-Aware
Adware.SwiftBrowse.L
868

Agnitum Outpost
Riskware.NetFilter
7.1.1

AhnLab V3 Security
Trojan/Win64.SwiftBrowse
2014.09.19

Avira AntiVirus
APPL/BrowseFox.zta
7.11.171.22

avast!
Win64:Malware-gen
2014.9-140919

AVG
NetCrawl
2015.0.3346

Baidu Antivirus
Adware.Win32.BrowseFox
4.0.3.14919

Bitdefender
Adware.SwiftBrowse.L
1.0.20.1310

Comodo Security
UnclassifiedMalware
18740

Dr.Web
Tool.NetFilter.1
9.0.1.0262

Emsisoft Anti-Malware
Adware.SwiftBrowse.L
8.14.09.19.08

ESET NOD32
Win64/Riskware.NetFilter (variant)
8.10439

F-Secure
Adware.SwiftBrowse.L
11.2014-19-09_6

G Data
Adware.SwiftBrowse
14.9.24

herdProtect (fuzzy)
variant of {6fcd6092-9615-4f7f-8898-8df53980e5d2}w64.sys (Adware)
2014.11.30.10

IKARUS anti.virus
AdWare.SwiftBrowse
t3scan.1.7.5.0

Malwarebytes
PUP.Optional.NetFilter
v2014.09.19.08

McAfee
Artemis!B122C03B432F
5600.7002

MicroWorld eScan
Adware.SwiftBrowse.L
15.0.0.786

nProtect
Adware.SwiftBrowse.L
14.05.23.01

Qihoo 360 Security
Win32/Trojan.RiskWare.a25
1.0.0.1015

Reason Heuristics
PUP.grassmow.m
14.9.22.1

Sophos
BrowseSmart
4.98

Trend Micro House Call
TROJ_GEN.F47V0523
7.2.262

VIPRE Antivirus
Yontoo
33236

Zillya! Antivirus
Adware.Yotoon.Win64.3
2.0.0.1913

File size:
43.7 KB (44,728 bytes)

Product version:
1.4.3.1

Copyright:
Copyright © 2013 StdLib

Original file name:
StdLib.sys

File type:
Driver (Win64 SYS)

Language:
English (United States)

Common path:
C:\Windows\System32\drivers\{2ac4981b-bb31-49d4-9706-b07c78762883}w64.sys

Digital Signature
Signed by:
grassmow

Authority:
VeriSign, Inc.

Valid from:
4/29/2014 10:00:00 AM

Valid to:
4/30/2015 9:59:59 AM

Subject:
CN=grassmow, OU=Digital ID Class 3 - Microsoft Software Validation v2, O=grassmow, 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:
46F979858F2F3241487CBA3EF684BAE8

File PE Metadata
Compilation timestamp:
9/13/2014 9:33:02 AM

OS version:
6.1

OS bitness:
Win64

Subsystem:
Native (none required)

Linker version:
9.0

CTPH (ssdeep):
768:+gLmaZF8aSQ7DwZmEhzg8ClFHeDrTdRfsQCa5075YLwidHwEkw:R5ZEQI8E7ClquaC759EBkw

Entry address:
0xB064

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, C6, 60, FF, FF, CC, CC, 38, B2, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 1C, B6, 00, 00, 60, 81, 00, 00, 28, B1, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, BE, B9, 00, 00, 50, 80, 00, 00, D8, B0, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, B6, BA, 00, 00, 00, 80, 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, 9A, BA, 00, 00, 00, 00, 00, 00, 86, BA, 00, 00...
 
[+]

Entropy:
6.3756

Code size:
30.5 KB (31,232 bytes)

Driver
Display name:
{2ac4981b-bb31-49d4-9706-b07c78762883}w64

Type:
Kernel device driver (KernelDriver)

Group:
PNP_TDI


herdProtect is a second line of defense malware removal platform powered by 68 anti-malware engines in the cloud. Since no single anti-malware program is perfect 100% of the time, herdProtect utilizes a 'herd' of multiple engines to guarantee the widest coverage and the earliest possible detection.