Fake Installers Drop Malware and Open Doors for Opportunistic Attackers

The example involves a user who tried to download an unauthorized version of TeamViewer (an app that has actually been used as camouflage for trojan spyware before).
The user downloaded a malicious file disguised as a crack installer for the application.
After downloading and executing these files, one of the child processes created other files and the executable setup.exe/setup-installv1.3.exe, which was extracted from 320yea_Teamviewer_15206.zip via WinRAR.exe. This file seems to be the source of most of the downloaded malicious files.

Afterward, the file aae15d524bc2.exe was dropped and executed via Command Prompt. It then spawned a file, C:Users{username}DocumentsetiKyTN_F_nmvAb2DF0BYeIk.exe, which sequentially initiated the BITS admin download.
BITS admin is a command-line tool that can help monitor progress and create, download, and upload jobs. The tool also allows a user to obtain arbitrary files from the internet, a feature that attackers can abuse.

Analysts also observed that information in the browser’s credential store was taken by the attacker.
Specifically, the stored data in C:Users{username}AppDataLocalMicrosoftEdgeUser DataDefaultLogin was copied. Credentials stored in browsers are often critical personal data that could be leveraged by attackers to gain access into personal, business, or financial accounts. Attackers can even compile and sell this information in underground markets.

To maintain persistence, an executable file was entered in the AutoStart registry and a scheduled task was created:
Create scheduled task: C:WindowsSystem32schtasks.exe /create /f/sc onlogon /rl highest /tn”services64″/tr ‘”C:Users{username}AppDataRoamingservices64.exe”‘
AutoStart registry: HKCUSOFTWAREMicrosoftWindowsCurrentVersionRunprun:C:WINDOWSPublicGamingprun.exe
As previously mentioned, these cases come about because users search for free applications and trust that someone is going to put the cracked or stolen full version online as a gesture of good will. But, attackers simply take advantage of those who download these files.

Following the execution of setup_x86_x64_install.exe, it created and executed a new file named setup_installer.exe that dropped several files and queried several domains.

Sign Up For Threat Alerts

Loading...
Threats Icon

Aug 11, 2022

Cisco Talos shares insights related to recent...

Initial access to the Cisco VPN was achieved via the successful compromise of a Cisco...

Threats Icon

Aug 11, 2022

Andariel deploys DTrack and Maui ransomware

The CISA published an alert, entitled, "North Korean State-Sponsored Cyber Actors Use Maui Ransomware To...

Threats Icon

Aug 09, 2022

Albanian Government Organizations Targeted By Possible Iranian...

Mandiant identified the ROADSWEEP ransomware family and a Telegram persona which targeted the Albanian government...

Threats Icon

Aug 08, 2022

BumbleBee Roasts Its Way to Domain Admin

Threat actors used BumbleBee as the initial access vector. BumbleBee is a malware loader that...

Threats Icon

Aug 08, 2022

RapperBot – new evolving malware

FortiGuard Labs has been tracking a rapidly evolving IoT malware family known as "RapperBot". This...

Threats Icon

Aug 04, 2022

Google Drive And Dropbox Used By APT29...

Cloaked Ursa (aka: APT29) has been targeting governmental entities in several countries with spear-phishing campaigns...

Threats Icon

Aug 03, 2022

Manjusaka: A Chinese sibling of Sliver and...

Cisco Talos recently discovered a new attack framework called "Manjusaka" being used in the wild...

Threats Icon

Aug 03, 2022

macOS Targeted With The CloudMensis Multi-Staged Malware

ESET researchers discovered a previously unknown macOS backdoor that spies on users of the compromised...

Threats Icon

Aug 01, 2022

Attackers Target Ukraine With GoMet Backdoor

Since the Russian invasion of Ukraine began, Ukrainians have been under a nearly constant barrage...

Threats Icon

Jul 31, 2022

Untangling KNOTWEED: European private-sector offensive actor using...

The Microsoft Threat Intelligence Center (MSTIC) and the Microsoft Security Response Center (MSRC) found a...

Threats Icon

Jul 31, 2022

Untangling KNOTWEED: European private-sector offensive actor using...

The Microsoft Threat Intelligence Center (MSTIC) and the Microsoft Security Response Center (MSRC) found a...

Threats Icon

Jul 26, 2022

EvilNum Targets Cryptocurrency, Forex, Commodities

Proofpoint Threat Research observed the group Proofpoint calls TA4563 targeting various European financial and investment...

Threats Icon

Jul 25, 2022

Lightning Framework: New Undetected “Swiss Army Knife”...

Lightning is a previously undocumented and undetected Linux threat. Lightning is a modular framework we...

Threats Icon

Jul 24, 2022

Redeemer Ransomware

Redeemer 2.0 Being Distributed Via Affiliate Program Cyble Research Labs has constantly been tracking emerging...

Threats Icon

Jul 21, 2022

Cobalt Strikes again: UAC-0056 continues to target...

The Malwarebytes Threat Intelligence team recently reviewed a series of cyber attacks against Ukraine that...