home

{ef8a89a7-7475-4559-9dc7-1f3ec0e5fa28}w64.sys

UpperFind

Part of the Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The file {ef8a89a7-7475-4559-9dc7-1f3ec0e5fa28}w64.sys by UpperFind 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 “{ef8a89a7-7475-4559-9dc7-1f3ec0e5fa28}w64”.
Publisher:
StdLib  (signed by UpperFind)

Product:
StdLib

Version:
1.4.4.6 built by: WinDDK

MD5:
7024c6b738e3a4d3894925ab4c3c38e4

SHA-1:
3343e38b43e92b20f4de8899ba3265b0a33819f7

SHA-256:
fc3d429f9713955c24e62bf8eeea02525bf783aa3cdd3d372a4274a3cff401f7

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:
5/20/2024 4:25:15 PM UTC  (today)

Scan engine
Detection
Engine version

Reason Heuristics
PUP.Yontoo (M)
17.1.28.3

File size:
47.3 KB (48,456 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\{ef8a89a7-7475-4559-9dc7-1f3ec0e5fa28}w64.sys

Digital Signature
Signed by:
UpperFind

Authority:
Symantec Corporation

Valid from:
7/16/2015 1:00:00 AM

Valid to:
9/14/2016 12:59:59 AM

Subject:
CN=UpperFind, O=UpperFind, L=Santa Monica, S=California, C=US

Issuer:
CN=Symantec Class 3 SHA256 Code Signing CA, OU=Symantec Trust Network, O=Symantec Corporation, C=US

Serial number:
30FD71FDC67AB01DA120C1E3EFFD9828

File PE Metadata
Compilation timestamp:
9/13/2016 11:51:59 PM

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:
6.3827

Code size:
34.5 KB (35,328 bytes)

Driver
Display name:
{ef8a89a7-7475-4559-9dc7-1f3ec0e5fa28}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.