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{91c8fa2b-6497-4e95-a795-70f08810ea4b}w64.sys

qualitink

Part of the Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The file {91c8fa2b-6497-4e95-a795-70f08810ea4b}w64.sys by qualitink 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 “{91c8fa2b-6497-4e95-a795-70f08810ea4b}w64”.
Publisher:
StdLib  (signed by qualitink)

Product:
StdLib

Version:
1.4.4.6 built by: WinDDK

MD5:
17b332e12f3d0a9e608f6c06f67d2d70

SHA-1:
5443970be1072075bec97850b93fa03182d55f4d

SHA-256:
9791bfe4c3ad061e52aec9926a0b4182aa4997feac2db40e2db7fc5582f5bfa3

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 6:54:46 AM UTC  (today)

Scan engine
Detection
Engine version

Reason Heuristics
PUP.Yontoo (M)
17.3.12.3

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)

Common path:
C:\Windows\System32\drivers\{91c8fa2b-6497-4e95-a795-70f08810ea4b}w64.sys

Digital Signature
Signed by:
qualitink

Authority:
VeriSign, Inc.

Valid from:
9/19/2013 3:00:00 AM

Valid to:
9/20/2015 2:59:59 AM

Subject:
CN=qualitink, OU=Digital ID Class 3 - Microsoft Software Validation v2, O=qualitink, 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:
0E5E2B6947A31815C876634E7DEC4B4E

File PE Metadata
Compilation timestamp:
1/16/2015 9:28:11 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...
 
[+]

Code size:
34.5 KB (35,328 bytes)

Driver
Display name:
{91c8fa2b-6497-4e95-a795-70f08810ea4b}w64

Type:
Kernel device driver (KernelDriver)

Group:
PNP_TDI


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