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gulbmyxt.exe

LibreOffice

Download Assistant

This is part of the Air Installer, a download manager which bundles applications with offers for additional 3rd party software, mostly unwanted adware, and may be installed with minimal consent. The application gulbmyxt.exe by Download Assistant has been detected as adware by 1 anti-malware scanner with very strong indications that the file is a potential threat. The program is a setup application that uses the AirInstaller Download Manager installer. It is also typically executed from the user's temporary directory. The file has been seen being downloaded from chrome.downloadlod.com.
Publisher:
Download Assistant  (signed and verified)

Product:
LibreOffice

Version:
3.0.0.153

MD5:
5ea4f2f881b56a205cda643a29f4c163

SHA-1:
e6051e627ca8ca5879395572e9693677fbf6a492

SHA-256:
c5d91ad9693cfbf85f3eea040aae9124e0ec0a35298025c51ad4ec5093f0d5d6

Scanner detections:
1 / 68

Status:
Adware

Note:
Our current pool of anti-malware engines have not currently detected this file, however based on our own detection heuristics we feel that this file is unwanted.

Description:
This is also known as bundleware, or downloadware, which is an downloader designed to simply deliver ad-supported offers in the setup routine of an otherwise legitimate software.

Analysis date:
12/26/2024 1:33:04 PM UTC  (today)

Scan engine
Detection
Engine version

Reason Heuristics
PUP.Air Software.Download.Bundler (M)
16.4.23.2

File size:
1.1 MB (1,140,040 bytes)

Product version:
3.0.0.153

Copyright:
(c) Download Assistant

File type:
Executable application (Win32 EXE)

Bundler/Installer:
AirInstaller Download Manager

Language:
Language Neutral

Common path:
C:\users\{user}\appdata\local\temp\{random}.tmp\gulbmyxt.exe

Digital Signature
Signed by:
Download Assistant

Authority:
Symantec Corporation

Valid from:
1/26/2016 1:00:00 AM

Valid to:
3/27/2017 1:59:59 AM

Subject:
CN=Download Assistant, O=Download Assistant, L=Victoria, S=British Columbia, C=CA

Issuer:
CN=Symantec Class 3 SHA256 Code Signing CA, OU=Symantec Trust Network, O=Symantec Corporation, C=US

Serial number:
1278A8BBE7E82E656B1FD4779E9BC2F0

File PE Metadata
Compilation timestamp:
1/30/2013 3:21:56 PM

OS version:
5.0

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
2.25

CTPH (ssdeep):
24576:yxGPZV5qFUjdta8fMDODyvQxTj0RrisHeEsqZ5zDQEJaki:3BqFUjdta1uWQ5j0Rrf+EdQEJaki

Entry address:
0x113BC

Entry point:
55, 8B, EC, 83, C4, A4, 53, 56, 57, 33, C0, 89, 45, C4, 89, 45, C0, 89, 45, A4, 89, 45, D0, 89, 45, C8, 89, 45, CC, 89, 45, D4, 89, 45, D8, 89, 45, EC, B8, 2C, 00, 41, 00, E8, E8, 51, FF, FF, 33, C0, 55, 68, 9E, 1A, 41, 00, 64, FF, 30, 64, 89, 20, 33, D2, 55, 68, 5A, 1A, 41, 00, 64, FF, 32, 64, 89, 22, A1, 48, 5B, 41, 00, E8, 16, D8, FF, FF, E8, 65, D3, FF, FF, 80, 3D, DC, 2A, 41, 00, 00, 74, 0C, E8, 2B, D9, FF, FF, 33, C0, E8, 80, 32, FF, FF, 8D, 55, EC, 33, C0, E8, E2, A3, FF, FF, 8B, 55, EC, B8, 50, 86...
 
[+]

Developed / compiled with:
Microsoft Visual C++

Code size:
65.5 KB (67,072 bytes)

The file gulbmyxt.exe has been seen being distributed by the following URL.

http://chrome.downloadlod.com/v2/click/eg9huyf4/?affiliate_image=http://www.downloadlod.com/down/.../images/Libreoffice.png&d=http://server2.downloadlod.com/files/libreoffice.msi&filename=LibreOffice_Setup&key=d90f8e0c21882256de42940be7e289d4425d544bb8fac6b298562257a8fef737&n=LibreOffice&product_image=http://www.downloadlod.com/down/.../images/01.png&sid=lod/.../Libreoffice&uid=&uao=TW96aWxsYS81LjAgKFdpbmRvd3MgTlQgMTAuMDsgV09XNjQpIEFwcGxlV2ViS2l0LzUzNy4zNiAoS0hUTUwsIGxpa2UgR2Vja28pIENocm9tZS80OC4wLjI1NjQuMTE2IFNhZmFyaS81MzcuMzY_&scid=81ada070-e84a-11e5-b113-0401ac007701

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