home

{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 1 anti-malware scanner with very strong indications that the file is a potential threat. It runs as a Windows 64-bit kernel mode device driver named “{2ac4981b-bb31-49d4-9706-b07c78762883}w64”.
Publisher:
StdLib  (signed by grassmow)

Product:
StdLib

Version:
1.4.3.1 built by: WinDDK

MD5:
bcb7a8dde9c39dded2aeacda4dcf4785

SHA-1:
2a57b4606af5c993208a562143da4b9f9f38ae29

SHA-256:
f2797e9b281bfbaca6d5a5db49efaf90fed6e281268f498448562d73e76cdc6f

Scanner detections:
1 / 68

Status:
Adware

Explanation:
Belongs to the Sambreel/Yontoo progam that inserts various forms of advertising in the user's web browser, installed with minimal or no user consent.

Analysis date:
11/23/2024 10:09:20 AM UTC  (today)

Scan engine
Detection
Engine version

Reason Heuristics
PUP.Yontoo
17.2.6.16

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:
4/28/2014 5:00:00 PM

Valid to:
4/29/2015 4:59:59 PM

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:
9/12/2014 4:33:02 PM

OS version:
6.1

OS bitness:
Win64

Subsystem:
Native (none required)

Linker version:
9.0

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:
6.3765

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.