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{ef8a89a7-7475-4559-9dc7-1f3ec0e5fa28}w.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}w.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 kernel mode device driver named “{ef8a89a7-7475-4559-9dc7-1f3ec0e5fa28}w”.
Publisher:
StdLib  (signed by UpperFind)

Product:
StdLib

Version:
1.4.4.6 built by: WinDDK

MD5:
e1c0f896204d70f464c7cf9552f9a356

SHA-1:
496bf1ffedc452409f6f8664da430f833b90f2c3

SHA-256:
9e5f459d1cfaf82810cdb451f1ad328c515f57803e384dfaabd3efaf31e6d7cb

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 3:47:58 PM UTC  (today)

Scan engine
Detection
Engine version

Reason Heuristics
PUP.Yontoo (M)
16.10.19.3

File size:
41.8 KB (42,824 bytes)

Product version:
1.4.4.6

Copyright:
Copyright © 2013 StdLib

Original file name:
StdLib.sys

File type:
Driver (Win32 SYS)

Language:
English (United States)

Common path:
C:\Windows\System32\drivers\{ef8a89a7-7475-4559-9dc7-1f3ec0e5fa28}w.sys

Digital Signature
Signed by:
UpperFind

Authority:
Symantec Corporation

Valid from:
7/15/2015 9:00:00 PM

Valid to:
9/13/2016 8:59:59 PM

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:
8/25/2015 9:47:01 AM

OS version:
6.1

OS bitness:
Win32

Subsystem:
Native (none required)

Linker version:
9.0

CTPH (ssdeep):
768:HN0457WBZwpHs63E+X7BIrTsCEziDH+JgrVJddvoBGz:thUcpH/0+LCf7EziDHhddz

Entry address:
0xA03E

Entry point:
8B, FF, 55, 8B, EC, E8, BD, FF, FF, FF, 5D, E9, 20, 70, FF, FF, CC, CC, 94, A1, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, CE, A4, 00, 00, E0, 80, 00, 00, B4, A0, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 24, A5, 00, 00, 00, 80, 00, 00, EC, A0, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, A4, A9, 00, 00, 38, 80, 00, 00, C4, A0, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 9C, AA, 00, 00, 10, 80, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, FC, A4, 00, 00, 10, A5, 00, 00, E8, A4...
 
[+]

Code size:
28 KB (28,672 bytes)

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

Type:
Kernel device driver (KernelDriver)

Group:
PNP_TDI


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