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ytab_setup.exe

Anton Kulichenko

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 ytab_setup.exe by Anton Kulichenko 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. The file has been seen being downloaded from save4u.eu. While running, it connects to the Internet address r1.stylezip.info on port 80 using the HTTP protocol.
Publisher:
Anton Kulichenko  (signed and verified)

MD5:
6755f51e46cec67241952cfbe56fb6af

SHA-1:
4b7bd209781364c9852062d89a4eba7b1ee33ef4

SHA-256:
ad4ce8c61255540a6f69a1b0ae6d42dee8fb12e45906d87c00f977fee09006fa

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 'download manager' is also considered bundleware, a utility designed to download software (possibly legitimate or opensource) and bundle it with a number of optional offers including ad-supported utilities, toolbars, shopping comparison tools and browser extensions.

Analysis date:
4/19/2024 2:45:47 AM UTC  (today)

Scan engine
Detection
Engine version

Reason Heuristics
PUP.WebPick.AntonKulichenko.Bundler (M)
16.2.4.4

File size:
1.5 MB (1,584,920 bytes)

File type:
Executable application (Win32 EXE)

Bundler/Installer:
WebPick InstalleRex

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

Digital Signature
Signed by:
Anton Kulichenko

Authority:
COMODO CA Limited

Valid from:
12/3/2013 7:00:00 AM

Valid to:
12/4/2014 6:59:59 AM

Subject:
CN=Anton Kulichenko, O=Anton Kulichenko, STREET=Engineering 7, L=Kiev, S=Kiev, PostalCode=01013, C=UA

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

Serial number:
00E406368A873FE17B8962DA09A05F7B2E

File PE Metadata
Compilation timestamp:
3/3/2014 5:29:50 PM

OS version:
5.1

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
11.0

CTPH (ssdeep):
24576:ndLZ9B4PnerMwNIimxmw/98lQqXYVfhR+ZG+cH3ej44+hr3ZU4XRAvuu8:tZ9KuNIimV1EcccHOIhry4Ovuu8

Entry address:
0x11EBB

Entry point:
E8, CE, 49, 00, 00, E9, 00, 00, 00, 00, 6A, 14, 68, F8, 32, 42, 00, E8, AF, 20, 00, 00, E8, E0, 07, 00, 00, 0F, B7, F0, 6A, 02, E8, 61, 49, 00, 00, 59, B8, 4D, 5A, 00, 00, 66, 39, 05, 00, 00, 40, 00, 74, 04, 33, DB, EB, 33, A1, 3C, 00, 40, 00, 81, B8, 00, 00, 40, 00, 50, 45, 00, 00, 75, EB, B9, 0B, 01, 00, 00, 66, 39, 88, 18, 00, 40, 00, 75, DD, 33, DB, 83, B8, 74, 00, 40, 00, 0E, 76, 09, 39, 98, E8, 00, 40, 00, 0F, 95, C3, 89, 5D, E4, E8, 20, 37, 00, 00, 85, C0, 75, 08, 6A, 1C, E8, DC, 00, 00, 00, 59, E8...
 
[+]

Entropy:
7.9093  (probably packed)

Code size:
108 KB (110,592 bytes)

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

http://save4u.eu/?e=ytr&publisher=1851&country=TH&prv=YoutubeAdblocker&ind=4880438331039742664&exid=1393914381359123926&ssd=13535100377203668220&hid=10611653911324677533&osid=601&channel=0&sfx=1&jc=1&category_name=YoutubeAdblocker&install_date=20130304

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

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

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