update_28.exe

Symbu LLC

This is the Tightrope WebInstall which bundles applications with offers for additional 3rd party software, mostly unwanted adware, and may be installed with minimal consent. The application update_28.exe by Symbu 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 Tightrope WebInstall installer.
Publisher:
Symbu LLC  (signed and verified)

MD5:
a9798907034068eb27e770e5718df88b

SHA-1:
d605f8adfb3bc2ab85e442c0dbeb73095fb20d73

SHA-256:
22ff59a04f01f0f69d2d9c7fdd6239e244027230ea5aba83e104ba8284b04b51

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:
5/27/2020 3:40:09 PM UTC  (today)

Scan engine
Detection
Engine version

Reason Heuristics
PUP.Tightrope (M)
17.2.23.2

File size:
653.9 KB (669,616 bytes)

File type:
Executable application (Win32 EXE)

Bundler/Installer:
Tightrope WebInstall (using Nullsoft Install System)

Language:
Language Neutral

Common path:
C:\users\{user}\appdata\local\microsoft\windows\temporary internet files\update_28.exe

Digital Signature
Signed by:

Authority:
DigiCert Inc

Valid from:
1/21/2015 8:00:00 AM

Valid to:
1/25/2016 8:00:00 PM

Subject:
CN=Symbu LLC, O=Symbu LLC, L=San Francisco, S=California, C=US

Issuer:
CN=DigiCert SHA2 Assured ID Code Signing CA, OU=www.digicert.com, O=DigiCert Inc, C=US

Serial number:
090A11C2A200806811FD3F043D627C7E

File PE Metadata
Compilation timestamp:
1/29/2015 2:35:11 PM

OS version:
5.1

OS bitness:
Win32

Subsystem:
Windows GUI

Linker version:
10.0

Entry address:
0x234A

Entry point:
81, EC, 80, 01, 00, 00, 53, 55, 56, 33, DB, 57, 89, 5C, 24, 18, C7, 44, 24, 10, 78, 73, 40, 00, 33, F6, C6, 44, 24, 14, 20, E8, F8, FD, FF, FF, FF, 15, 30, 77, 40, 00, 68, 01, 80, 00, 00, FF, 15, C0, 70, 40, 00, 53, FF, 15, 2C, 77, 40, 00, 6A, 08, A3, 98, 3D, 42, 00, E8, DD, F9, FF, FF, 53, 68, 60, 01, 00, 00, A3, A0, 3C, 42, 00, 8D, 44, 24, 38, 50, 53, 68, 0B, 74, 40, 00, FF, 15, 50, 71, 40, 00, 68, 00, 74, 40, 00, 68, A0, 34, 42, 00, E8, 5A, F3, FF, FF, FF, 15, BC, 70, 40, 00, 50, BF, 00, 90, 42, 00, 57...
 
[+]

Entropy:
7.9733

Packer / compiler:
Nullsoft install system v2.x

Code size:
23 KB (23,552 bytes)

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