Tuesday, March 5, 2024

New MacOS Backdoor Distributed through Malicious Word Documents

A new MacOS Backdoor that embedded in malicious Word document has been likely distributed through phishing campaigns. Upon executing the documents it asks users to enable macros to download the final payload.

TrendMicro Researchers believe the backdoor is linked to hacking group OceanLotus, who responsible for launching high profile attacks against human rights organizations, media organizations, research institutes, and maritime construction firms.

Attackers targeted MacOS computers that have Perl modules installed. The MacOS Backdoor OSX_OCEANLOTUS.D is written in Perl programming language and the macro is obfuscated using decimal ASCII code.

MacOS Backdoor

The dropper is a persistent one and all the strings in the dropper are encrypted using an RSA256 key and custom base64-encoded.

MacOS Backdoor Functions

The backdoor contains two important functions.

infoClient – It collects the information and such as ComputerName, Mac OSX version, Owner’s name and checks for x86/ 64 bit.

runHandle – responsible for handling backdoor operations

All the data collected will be encrypted and then transferred to the C&C server. It scrambles it checks for the byte is odd or even and adds data according to it.

The scrambled data is to be encrypted again with randomly AES 256 key and the key is also scrambled with operation XOR 0x13 followed by ROL 6 operation.

MacOS Backdoor

Also, the final payload that obtained from the server also decoded again in a similar manner via decryption and scrambling.

How to stay safe – Business Phishing Campaign

1. Have a unique Email address.
2. Do not open any attachments without proper validation.
3. Don’t open emails voluntary emails.
4. Use Spam filters & Antispam gateways.
5. Never respond to any spam emails.
6. verify the vendor.
7. Implement Two-factor Authentication


Latest articles

US Court Orders NSO Group to Handover Code for Spyware, Pegasus to WhatsApp

Meta, the company that owns WhatsApp, filed a lawsuit against NSO Group in 2019....

New SSO-Based Phishing Attack Trick Users into Sharing Login Credentials  

Threat actors employ phishing scams to trick individuals into giving away important details like...

U.S. Charged Iranian Hacker, Rewards up to $10 Million

The United States Department of Justice (DoJ) has charged an Iranian national, Alireza Shafie...

Huge Surge in Ransomware-as-a-Service Attacks targeting Middle East & Africa

The Middle East and Africa (MEA) region has witnessed a surge in ransomware-as-a-service (RaaS)...

New Silver SAML Attack Let Attackers Forge Any SAML Response To Entra ID

SolarWinds cyberattack was one of the largest attacks of the century in which attackers...

AI Worm Developed by Researchers Spreads Automatically Between AI Agents

Researchers have developed what they claim to be one of the first generative AI...

20 Million+ Cutout.Pro User Records Leaked On Hacking Forums

CutOut.Pro, an AI-powered photo and video editing platform, has reportedly suffered a data breach,...
Guru baran
Guru baranhttps://gbhackers.com
Gurubaran is a co-founder of Cyber Security News and GBHackers On Security. He has 10+ years of experience as a Security Consultant, Editor, and Analyst in cybersecurity, technology, and communications.

Live Account Takeover Attack Simulation

Live Account Take Over Attack

Live Webinar on How do hackers bypass 2FA ,Detecting ATO attacks, A demo of credential stuffing, brute force and session jacking-based ATO attacks, Identifying attacks with behaviour-based analysis and Building custom protection for applications and APIs.

Related Articles