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{c5e48979-bd7f-4cf7-9b73-2482a67a4f37}gt64.sys

ClearThink

Part of the Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The file {c5e48979-bd7f-4cf7-9b73-2482a67a4f37}gt64.sys by ClearThink 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 “{c5e48979-bd7f-4cf7-9b73-2482a67a4f37}Gt64”.
Publisher:
StdLib  (signed by ClearThink)

Product:
StdLib

Version:
1.4.3.1 built by: WinDDK

MD5:
ef10132e94cad2007af3fdb8629a31ea

SHA-1:
d05b7ce4068bbeac303c8075e4c8003993a7e472

SHA-256:
2450d5a9228fc6214e818bd1ef202e0551939f1765c80aac80a7956f5e9bde5b

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:
4/26/2024 4:22:18 PM UTC  (today)

Scan engine
Detection
Engine version

Reason Heuristics
PUP.Yontoo (M)
17.2.27.14

File size:
58.6 KB (60,048 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\{c5e48979-bd7f-4cf7-9b73-2482a67a4f37}gt64.sys

Digital Signature
Signed by:
ClearThink

Authority:
VeriSign, Inc.

Valid from:
8/5/2014 2:00:00 AM

Valid to:
8/6/2015 1:59:59 AM

Subject:
CN=ClearThink, O=ClearThink, 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:
1200063ED04B1DA36F7FE204B3DD8617

File PE Metadata
Compilation timestamp:
8/7/2014 1:52:34 AM

OS version:
6.1

OS bitness:
Win64

Subsystem:
Native (none required)

Linker version:
9.0

Entry address:
0x10064

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, 8E, B3, FF, FF, CC, CC, D0, 00, 01, 00, 00, 00, 00, 00, 00, 00, 00, 00, 40, 05, 01, 00, 10, C0, 00, 00, C0, 00, 01, 00, 00, 00, 00, 00, 00, 00, 00, 00, 62, 05, 01, 00, 00, C0, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 4E, 05, 01, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 3C, 02, 01, 00, 00, 00, 00, 00, 50, 02, 01, 00, 00, 00, 00, 00, 6E, 02, 01, 00...
 
[+]

Code size:
45 KB (46,080 bytes)

Driver
Display name:
{c5e48979-bd7f-4cf7-9b73-2482a67a4f37}Gt64

Type:
Kernel device driver (KernelDriver)

Group:
PNP_TDI


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