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{19831108-de35-4c98-b883-7bb790bfc59c}gt.sys

Fralimbo

Part of the Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The file {19831108-de35-4c98-b883-7bb790bfc59c}gt.sys by Fralimbo 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 “{19831108-de35-4c98-b883-7bb790bfc59c}Gt”.
Publisher:
StdLib  (signed by Fralimbo)

Product:
StdLib

Version:
1.4.3.1 built by: WinDDK

MD5:
784d002ba5162a3d577da003a346f017

SHA-1:
226dae68f4acafdd16e3827d2fc1dd2298d0184e

SHA-256:
9ddb39d5ea8c39031d9d35f4ebc8dae833b69d6a4493417d175e11e8cc31938e

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 4:57:18 PM UTC  (today)

Scan engine
Detection
Engine version

Reason Heuristics
PUP.Yontoo (M)
16.10.30.1

File size:
53.8 KB (55,096 bytes)

Product version:
1.4.3.1

Copyright:
Copyright © 2013 StdLib

Original file name:
StdLib.sys

File type:
Driver (Win32 SYS)

Language:
English (United States)

Common path:
C:\Windows\System32\drivers\{19831108-de35-4c98-b883-7bb790bfc59c}gt.sys

Digital Signature
Signed by:
Fralimbo

Authority:
VeriSign, Inc.

Valid from:
11/14/2013 1:00:00 AM

Valid to:
11/15/2014 12:59:59 AM

Subject:
CN=Fralimbo, OU=Digital ID Class 3 - Microsoft Software Validation v2, O=Fralimbo, 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:
4EA4A1919F354306FDA2DA6D760C0CAE

File PE Metadata
Compilation timestamp:
8/7/2014 1:52:31 AM

OS version:
6.1

OS bitness:
Win32

Subsystem:
Native (none required)

Linker version:
9.0

CTPH (ssdeep):
768:xOnnE+ZwNszUTw/RqzGojR/h3cKG45q30XGBUuJ0xEkMHd8OagKmvz11/6RRR51S:inERxTukHzTrGCuGOVh1/yRsOE

Entry address:
0xA6BE

Entry point:
8B, FF, 55, 8B, EC, E8, BD, FF, FF, FF, 5D, E9, 4A, E4, FF, FF, CC, CC, 34, A7, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 04, AB, 00, 00, 94, 90, 00, 00, 20, A7, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 3A, AB, 00, 00, 80, 90, 00, 00, 2C, A7, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 56, AB, 00, 00, 8C, 90, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 26, AB, 00, 00, 12, AB, 00, 00, 00, 00, 00, 00, 42, AB, 00, 00, 00, 00, 00, 00, 2C, A8, 00, 00, 44, A8, 00, 00, 56, A8...
 
[+]

Code size:
36.3 KB (37,120 bytes)

Driver
Display name:
{19831108-de35-4c98-b883-7bb790bfc59c}Gt

Type:
Kernel device driver (KernelDriver)

Group:
PNP_TDI


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