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{19854aff-7c07-4859-9831-cd028ac55dd0}w.sys

PacFunction

Part of the Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The file {19854aff-7c07-4859-9831-cd028ac55dd0}w.sys by PacFunction has been detected as adware by 27 anti-malware scanners. It runs as a Windows kernel mode device driver named “{19854aff-7c07-4859-9831-cd028ac55dd0}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 PacFunction)

Product:
StdLib

Version:
1.4.3.1 built by: WinDDK

MD5:
8f83a17c9a3edd33d6962e466a156737

SHA-1:
3368d9c99d63ef6ca281ab2ae15a67c175f8976e

SHA-256:
84a3738f202d0d75612c1ff694b3506504e127b509bb80b796e06f05d7932908

Scanner detections:
27 / 68

Status:
Adware

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

Analysis date:
4/25/2024 9:46:44 PM UTC  (today)

Scan engine
Detection
Engine version

Lavasoft Ad-Aware
Adware.Mplug.DC
357

Agnitum Outpost
PUA.Yotoon
7.1.1

AhnLab V3 Security
PUP/Win32.BrowseFox
2014.10.05

Avira AntiVirus
Adware/BrowseFox.A.168
7.11.176.148

AVG
Pafun
2017.0.2835

Baidu Antivirus
Adware.Win32.BrowseFox
4.0.3.16213

Bitdefender
Adware.Mplug.DC
1.0.20.220

Bkav FE
W32.HfsAdware
1.3.0.6379

Clam AntiVirus
Win.Adware.Swiftbrowse-79
0.98/21511

Comodo Security
TrojWare.Win32.AltBrowse.IZZV
21241

Dr.Web
Trojan.BPlug.123
9.0.1.044

Emsisoft Anti-Malware
Adware.Mplug.DC
8.16.02.13.12

ESET NOD32
Win32/Komodia.A potentially unsafe (variant)
10.11248

F-Prot
W32/A-c99f2d8b
v6.4.7.1.166

F-Secure
Adware.Mplug.DC
11.2016-13-02_7

G Data
Adware.Mplug.DC
16.2.25

IKARUS anti.virus
AdWare.SwiftBrowse
t3scan.1.7.8.0

McAfee
Artemis!AE53B69E8E1D
5600.6491

MicroWorld eScan
Adware.Mplug.DC
17.0.0.132

NANO AntiVirus
Riskware.Win32.Yotoon.ddghtt
0.30.0.296

nProtect
Adware.Mplug.DC
15.02.27.01

Panda Antivirus
Trj/CI.A
16.02.13.12

Reason Heuristics
PUP.Yontoo.PacFunction (M)
16.2.13.0

Trend Micro House Call
Suspicious_GEN.F47V0709
7.2.44

Vba32 AntiVirus
AdWare.Win64.Yotoon
3.12.26.3

VIPRE Antivirus
Trojan.Win32.Generic
37990

Zillya! Antivirus
Adware.Yotoon.Win64.1
2.0.0.2084

File size:
51.7 KB (52,928 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\{19854aff-7c07-4859-9831-cd028ac55dd0}w.sys

Digital Signature
Signed by:
PacFunction

Authority:
VeriSign, Inc.

Valid from:
1/9/2014 5:30:00 AM

Valid to:
1/10/2015 5:29:59 AM

Subject:
CN=PacFunction, OU=Digital ID Class 3 - Microsoft Software Validation v2, O=PacFunction, 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:
4DF47FADF68D2EB9B8A7923DCCC176FF

File PE Metadata
Compilation timestamp:
1/31/2014 6:15:28 AM

OS version:
6.1

OS bitness:
Win32

Subsystem:
Native (none required)

Linker version:
9.0

CTPH (ssdeep):
768:xIsHpnKHCBSqUPJHKQpkJxpKwT2bcWiJmOtX3g2rp3lnH05qc:+sHRKHLJqQpkYwTsiTtXxtmqc

Entry address:
0xC03E

Entry point:
8B, FF, 55, 8B, EC, E8, BD, FF, FF, FF, 5D, E9, 62, 50, FF, FF, CC, CC, 74, C1, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, BC, C4, 00, 00, C0, A0, 00, 00, B4, C0, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 12, C5, 00, 00, 00, A0, 00, 00, EC, C0, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, AE, C8, 00, 00, 38, A0, 00, 00, C4, C0, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, A6, C9, 00, 00, 10, A0, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, EA, C4, 00, 00, FE, C4, 00, 00, D6, C4...
 
[+]

Entropy:
6.3562

Code size:
37 KB (37,888 bytes)

Driver
Display name:
{19854aff-7c07-4859-9831-cd028ac55dd0}w

Type:
Kernel device driver (KernelDriver)

Group:
PNP_TDI


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