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{3efcbdb9-1ed5-43c4-b690-37fd8c06fdcb}w64.sys

GrabRez

Part of the Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The file {3efcbdb9-1ed5-43c4-b690-37fd8c06fdcb}w64.sys by GrabRez 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 “{3efcbdb9-1ed5-43c4-b690-37fd8c06fdcb}w64”.
Publisher:
StdLib  (signed by GrabRez)

Product:
StdLib

Version:
1.4.4.6 built by: WinDDK

MD5:
dad731d4c589034344b4d9ae831f3d65

SHA-1:
da3bb8fb1360a4c09887b3c6aba33c9b139768d2

SHA-256:
954f9a3f2dd48688f0d033364ee21af41c6ef118e4b024e8ca4d706434fe7e4d

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:
1/12/2025 12:36:21 AM UTC  (today)

Scan engine
Detection
Engine version

Reason Heuristics
PUP.Yontoo (M)
17.3.1.9

File size:
47.6 KB (48,776 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\{3efcbdb9-1ed5-43c4-b690-37fd8c06fdcb}w64.sys

Digital Signature
Signed by:
GrabRez

Authority:
VeriSign, Inc.

Valid from:
11/4/2014 5:00:00 AM

Valid to:
1/4/2016 4:59:59 AM

Subject:
CN=GrabRez, O=GrabRez, 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:
480BAD6BB5A4820321638294CE8F3B13

File PE Metadata
Compilation timestamp:
2/16/2015 7:35:35 AM

OS version:
6.1

OS bitness:
Win64

Subsystem:
Native (none required)

Linker version:
9.0

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:
6.3941

Code size:
34.5 KB (35,328 bytes)

Driver
Display name:
{3efcbdb9-1ed5-43c4-b690-37fd8c06fdcb}w64

Type:
Kernel device driver (KernelDriver)

Group:
PNP_TDI


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