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updategrassmow.exe

grassmow

Part of the Yontoo web browser plugin (delivers advertisements to the web browser in the form of injected banners, text-links, popups, etc.) the updater mechanism for grassmow will automatically keep the extension patched by downloaded new functionality which is auto-enabled by default. The application updategrassmow.exe by grassmow has been detected as adware by 5 anti-malware scanners. It runs as a separate (within the context of its own process) windows Service named “Update grassmow”. It will plug into the web browser and display context-based advertisements by overwriting existing ads or by inserting new ones on various web pages.
Publisher:
grassmow  (signed and verified)

Version:
1.0.5397.26550

MD5:
ab97c4af77227a1d414394ff7638c99e

SHA-1:
91c07acd6a9c0b618d646239cf318d94c622fc9c

SHA-256:
a9b7ca5e4aa21f8719723b9dffa68b7575fa8f5958c058b575fd55fbd2f0f9b3

Scanner detections:
5 / 68

Status:
Adware

Explanation:
Part of the Yontoo adware web browser extension update process.

Analysis date:
5/9/2024 9:07:16 PM UTC  (today)

Scan engine
Detection
Engine version

AVG
Generic
2015.0.3324

ESET NOD32
MSIL/BrowseFox (variant)
8.10548

Malwarebytes
PUP.Optional.Grassmow.A
v2014.10.11.10

Reason Heuristics
Adware.Yontoo.Service.O
14.10.11.21

VIPRE Antivirus
Threat.4741131
33706

File size:
510.3 KB (522,528 bytes)

Product version:
1.0.5397.26550

Original file name:
grassmow.exe

File type:
Executable application (Win32 EXE)

Language:
Language Neutral

Common path:
C:\Program Files\grassmow\updategrassmow.exe

Digital Signature
Signed by:
grassmow

Authority:
VeriSign, Inc.

Valid from:
4/28/2014 8:00:00 PM

Valid to:
4/29/2015 7:59:59 PM

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:
10/11/2014 6:45:05 PM

OS version:
4.0

OS bitness:
Win32

Subsystem:
Windows Console

Linker version:
6.0

.NET CLR dependent:
Yes

CTPH (ssdeep):
12288:Ch+BUVygzVyoS1Tj6B7V6WwoZhmjQUmM0e:CsYySV1S1TurhmFmMt

Entry address:
0x7F43E

Entry point:
FF, 25, 00, 20, 40, 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, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 00, 02, 00, 00, 00, 5B, 00, 00, 00, 80, F4, 07, 00, 80, D6, 07, 00, 52, 53, 44, 53, 4B, 5C, A4, 40, 03, 2B, 6C, 4A, B7, 3F, DB, EE, 04, 76, D5, 16, 01, 00, 00, 00, 44, 3A, 5C, 55, 74, 69, 6C, 69, 74, 69, 65, 73, 5C, 62, 61, 64, 30, 75, 6E, 77, 77, 2E, 34, 6F, 6D, 5C, 44, 65, 73, 6B, 74, 6F, 70, 5C, 44, 65, 73, 6B...
 
[+]

Entropy:
5.9067

Developed / compiled with:
Microsoft Visual C# / Basic .NET

Code size:
501.5 KB (513,536 bytes)

Service
Display name:
Update grassmow

Type:
Win32OwnProcess


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