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{ef3f84a6-599c-4148-a8eb-9aa938299b3e}gt64.sys

Dynamo Combo

Part of the Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The file {ef3f84a6-599c-4148-a8eb-9aa938299b3e}gt64.sys by Dynamo Combo 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 “{ef3f84a6-599c-4148-a8eb-9aa938299b3e}Gt64”.
Publisher:
StdLib  (signed by Dynamo Combo)

Product:
StdLib

Version:
1.4.3.1 built by: WinDDK

MD5:
0f013d903f1d45f69bbf0752467a54fc

SHA-1:
f21dd56c5f87ff9b644dcac6e1280f07a5ddbc9b

SHA-256:
b42f51d8584bb5f6bf486d3753bfa093c343bbe6859d48421496e1394a46c9b6

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:
12/24/2024 11:21:56 AM UTC  (today)

Scan engine
Detection
Engine version

Reason Heuristics
PUP.Yontoo (M)
17.1.12.8

File size:
59.6 KB (61,080 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\{ef3f84a6-599c-4148-a8eb-9aa938299b3e}gt64.sys

Digital Signature
Signed by:
Dynamo Combo

Authority:
VeriSign, Inc.

Valid from:
12/16/2014 7:00:00 PM

Valid to:
12/17/2015 6:59:59 PM

Subject:
CN=Dynamo Combo, O=Dynamo Combo, 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:
14A953D6CFA5311EDEF6756B21556A7A

File PE Metadata
Compilation timestamp:
1/3/2015 3:56:23 AM

OS version:
6.1

OS bitness:
Win64

Subsystem:
Native (none required)

Linker version:
9.0

Entry address:
0x11064

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, AA, A7, FF, FF, CC, CC, D0, 10, 01, 00, 00, 00, 00, 00, 00, 00, 00, 00, 38, 15, 01, 00, 10, D0, 00, 00, C0, 10, 01, 00, 00, 00, 00, 00, 00, 00, 00, 00, 5A, 15, 01, 00, 00, D0, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 46, 15, 01, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 34, 12, 01, 00, 00, 00, 00, 00, 48, 12, 01, 00, 00, 00, 00, 00, 66, 12, 01, 00...
 
[+]

Entropy:
6.3825

Code size:
46 KB (47,104 bytes)

Driver
Display name:
{ef3f84a6-599c-4148-a8eb-9aa938299b3e}Gt64

Type:
Kernel device driver (KernelDriver)

Group:
PNP_TDI


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