tstlibg.sys

Caramava

Part of the Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The file tstlibg.sys by Caramava has been detected as adware by 2 anti-malware scanners. It runs as a Windows kernel mode device driver named “tStLibG”.
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Publisher:
StdLib  (signed by Caramava)

Product:
StdLib

Version:
1.4.3.1 built by: WinDDK

MD5:
4ec8f278fd613e9135311e8e126b8405

SHA-1:
29054be7e2136c746975e6a94603314efbd108cb

Scanner detections:
2 / 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:
12/9/2016 12:43:02 PM UTC  (today)

Scan engine
Detection
Engine version

AVG
MalSign.Carama
2015.0.3448

Reason Heuristics
Adware.Yontoo.Caramava.K
14.6.10.11

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File size:
53.9 KB (55,224 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\tstlibg.sys

Digital Signature
Signed by:

Authority:
VeriSign, Inc.

Valid from:
2/4/2014 1:00:00 AM

Valid to:
2/5/2015 12:59:59 AM

Subject:
CN=Caramava, OU=Digital ID Class 3 - Microsoft Software Validation v2, O=Caramava, 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:
00E90CD7C8459392168639C13BC804AE

File PE Metadata
Compilation timestamp:
1/31/2014 1:46:38 AM

OS version:
6.1

OS bitness:
Win32

Subsystem:
Native (none required)

Linker version:
9.0

CTPH (ssdeep):
768:VQbP7EDNtMTw/RWDjR/McKV5qEXGBJgxgZ+4AOmvtnBU6+RRAvkD5:SP7EJSTukuzTrGYs+JNBUtRPD5

Entry address:
0xA73E

Entry point:
8B, FF, 55, 8B, EC, E8, BD, FF, FF, FF, 5D, E9, CA, E3, FF, FF, CC, CC, B4, A7, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 84, AB, 00, 00, 94, 90, 00, 00, A0, A7, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, BA, AB, 00, 00, 80, 90, 00, 00, AC, A7, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, D6, 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, A6, AB, 00, 00, 92, AB, 00, 00, 00, 00, 00, 00, C2, AB, 00, 00, 00, 00, 00, 00, AC, A8, 00, 00, C4, A8, 00, 00, D6, A8...
 
[+]

Code size:
36.3 KB (37,120 bytes)

Driver
Display name:
tStLibG

Type:
Kernel device driver (KernelDriver)

Group:
PNP_TDI


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