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ytbmk_setup.exe

Dmitry Volonov

The is the installer for the WebPick InstalleRex download manager which bundles applications with offers for additional 3rd party software, mostly unwanted adware, and may be installed without consent. The application ytbmk_setup.exe by Dmitry Volonov 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 WebPick InstalleRex installer. It is also typically executed from the user's temporary directory. While running, it connects to the Internet address r1.stylezip.info on port 80 using the HTTP protocol.
Publisher:
Dmitry Volonov  (signed and verified)

MD5:
4862ea9766485aee08931958d8dfc874

SHA-1:
ac18b88be8f14564c670883162ea860f422ad142

SHA-256:
09422d6ebaafb6465a7e1e6cdf2c8d36174b1e947334dfbe18997504966e3d0b

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:
4/25/2024 11:00:10 AM UTC  (today)

Scan engine
Detection
Engine version

Reason Heuristics
PUP.WebPick.DmitryVolonov.Bundler (M)
16.2.12.17

File size:
653.9 KB (669,576 bytes)

File type:
Executable application (Win32 EXE)

Bundler/Installer:
WebPick InstalleRex

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

Digital Signature
Signed by:
Dmitry Volonov

Authority:
COMODO CA Limited

Valid from:
9/27/2013 3:00:00 AM

Valid to:
9/28/2014 2:59:59 AM

Subject:
CN=Dmitry Volonov, O=Dmitry Volonov, STREET=Lepse 14, L=Kiev, S=Kiev, PostalCode=03065, C=UA

Issuer:
CN=COMODO Code Signing CA 2, O=COMODO CA Limited, L=Salford, S=Greater Manchester, C=GB

Serial number:
3D57C4A60FE2C6814E02CB06FE8290BF

File PE Metadata
Compilation timestamp:
12/9/2013 7:18:19 PM

OS version:
5.1

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
10.0

CTPH (ssdeep):
12288:sHzvXy63ZTXj77x4NC9vhLdOdC+g+c9BIz/wkp4S7NqDMKcMI2b7yKYGZ:sTJ3Z37eNC9vhhMChEl7AqMI6uGZ

Entry address:
0xF7E7

Entry point:
E8, 38, 3F, 00, 00, E9, 89, FE, FF, FF, 8B, FF, 55, 8B, EC, 8B, 45, 08, 33, C9, 3B, 04, CD, 28, E0, 41, 00, 74, 13, 41, 83, F9, 2D, 72, F1, 8D, 48, ED, 83, F9, 11, 77, 0E, 6A, 0D, 58, 5D, C3, 8B, 04, CD, 2C, E0, 41, 00, 5D, C3, 05, 44, FF, FF, FF, 6A, 0E, 59, 3B, C8, 1B, C0, 23, C1, 83, C0, 08, 5D, C3, E8, DC, 07, 00, 00, 85, C0, 75, 06, B8, 90, E1, 41, 00, C3, 83, C0, 08, C3, E8, C9, 07, 00, 00, 85, C0, 75, 06, B8, 94, E1, 41, 00, C3, 83, C0, 0C, C3, 8B, FF, 55, 8B, EC, 56, E8, E2, FF, FF, FF, 8B, 4D, 08...
 
[+]

Entropy:
7.8729  (probably packed)

Code size:
92 KB (94,208 bytes)

The executing file has been seen to make the following network communications in live environments.

TCP (HTTP):
Connects to r1.stylezip.info  (54.186.255.26:80)

TCP (HTTP):
Connects to c1.stylezip.info  (54.186.255.26:80)

 
http://c1.stylezip.info/?step_id=1&installer_id=66944776&publisher_id=694&source_id=0&page_id=0&country_code=US&locale=US&browser_id=4&download_id=200834328&external_id=0&session_id=401668656&hardware_id=468613432&installer_file_name=ytbmk_setup

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