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{2ac4981b-bb31-49d4-9706-b07c78762883}gw64.sys

grassmow

Part of the Yontoo adware component, a web browser plugin that injects unwanted ads in the browser. The file {2ac4981b-bb31-49d4-9706-b07c78762883}gw64.sys by grassmow has been detected as adware by 3 anti-malware scanners. It runs as a Windows 64-bit kernel mode device driver named “{2ac4981b-bb31-49d4-9706-b07c78762883}Gw64”.
Publisher:
StdLib  (signed by grassmow)

Product:
StdLib

Version:
1.4.4.6 built by: WinDDK

MD5:
027805f86c407c5b3fff5f5c95bd9ec6

SHA-1:
9741b4896642dd348547623df6662bd1ac97c072

SHA-256:
a18fb1468d9c975da307bc98d55c548147bce3e19a9da7b0ba90b89d2833c915

Scanner detections:
3 / 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:
5/2/2024 8:57:09 PM UTC  (today)

Scan engine
Detection
Engine version

AVG
Generic
2015.0.3334

Reason Heuristics
PUP.grassmow.n
14.10.2.8

VIPRE Antivirus
Threat.4741131
33120

File size:
47.7 KB (48,824 bytes)

Product version:
1.4.4.6

Copyright:
Copyright © 2013 StdLib

Original file name:
StdLib.sys

File type:
Driver (Win64 SYS)

Language:
English (United States)

Common path:
C:\Windows\System32\drivers\{2ac4981b-bb31-49d4-9706-b07c78762883}gw64.sys

Digital Signature
Signed by:
grassmow

Authority:
VeriSign, Inc.

Valid from:
4/29/2014 1:00:00 AM

Valid to:
4/30/2015 12:59:59 AM

Subject:
CN=grassmow, OU=Digital ID Class 3 - Microsoft Software Validation v2, O=grassmow, 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:
46F979858F2F3241487CBA3EF684BAE8

File PE Metadata
Compilation timestamp:
9/22/2014 8:01:54 PM

OS version:
6.1

OS bitness:
Win64

Subsystem:
Native (none required)

Linker version:
9.0

CTPH (ssdeep):
768:lJ7G2EjsnyXeOUEGG0LA8tWFZuL470h6aqxcCT2kvsVRwlZD3LpEKk:DFID6EGnLA8AFJTNEVmDLOx

Entry address:
0xC064

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, E2, 50, FF, FF, CC, CC, 78, C2, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 54, C6, 00, 00, A0, 91, 00, 00, 28, C1, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, DA, CA, 00, 00, 50, 90, 00, 00, D8, C0, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, D2, CB, 00, 00, 00, 90, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, B6, CB, 00, 00, 00, 00, 00, 00, A2, CB, 00, 00...
 
[+]

Entropy:
6.3927

Code size:
34.5 KB (35,328 bytes)

Driver
Display name:
{2ac4981b-bb31-49d4-9706-b07c78762883}Gw64

Type:
Kernel device driver (KernelDriver)

Group:
PNP_TDI


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