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

Nov 29, 2021

IKEA email systems hit by ongoing cyberattack

IKEA is battling an ongoing cyberattack where threat actors are targeting employees in internal phishing...

Threats Icon

Nov 28, 2021

Tardigrade Malware targets Biomanufacturing Facilities

An advanced persistent threat (APT) has been linked to cyberattacks on two biomanufacturing companies that...

Threats Icon

Nov 25, 2021

RATDispenser – Stealthy JavaScript Loader Dispensing RATs

Attackers are using an evasive JavaScript loader, RATDispenser, to distribute remote access Trojans (RATs) and...

Threats Icon

Nov 24, 2021

Memento Team uses password-protected archives to bypass...

Calling themselves "Memento team", actors use Python-based ransomware that they reconfigured after setbacks. This was...

Threats Icon

Nov 23, 2021

Squirrelwaffle Exploits ProxyShell and ProxyLogon to Hijack...

Squirrelwaffle emerged as a new loader that is spread through spam campaigns. It is known...

Threats Icon

Nov 22, 2021

Emotet Returns

Back in January 2021, law enforcement and judicial authorities worldwide took down the Emotet botnet....

Threats Icon

Nov 18, 2021

Iranian Government-Sponsored APT Cyber Actors Exploiting Microsoft...

The Iranian government-sponsored APT actors are actively targeting a broad range of victims across multiple...

Threats Icon

Nov 17, 2021

Web compromises in the Middle East with...

ESET researchers have discovered strategic web compromise (aka watering hole) attacks against high-profile websites in...

Threats Icon

Nov 16, 2021

MosesStaff techniques: Ideology over Money

Hacker group MosesStaff began targeting Israeli organizations, joining a wave of attacks which was started...

Threats Icon

Nov 15, 2021

Lyceum mass backdoor attacks

Lyceum backdoors appear to have targeted ISPs and telecommunication operators in Israel, Morocco, Tunisia, and...

Threats Icon

Nov 14, 2021

New Golang malware (BotenaGo) targeting millions of...

Analysts have found new malware written in the open source programming language Golang. Deployed with...

Threats Icon

Nov 11, 2021

Fresh Variant of Snake Keylogger Malware

Snake Keylogger is a malware developed using .NET. It first appeared in late 2020 and...

Threats Icon

Nov 10, 2021

Mekotio Banker – Improved Stealth and Ancient...

A banking Trojan called "Mekotio" that targeted Latin America countries in the past, now making...

Threats Icon

Nov 09, 2021

Targeted Attack Campaign Against ManageEngine ADSelfService Plus...

US Cybersecurity and Infrastructure Security Agency (CISA) released an alert warning that advanced persistent threat...

Threats Icon

Nov 08, 2021

SquirrelWaffle Leverages malspam to deliver Qakbot

Recently, a new threat, referred to as "SquirrelWaffle" is being spread more widely via spam...