Rewterz Threat Alert – Tofsee Malware – Active IOCs

Severity

High

Analysis Summary

Tofsee malware has been around since 2016. Once installed on a compromised computer, it can be used to send spam emails and gather user data. The malware has the ability to download more modules to carry out different activities. It can track users’ online activities, steal personal information and credentials, and change browser and DNS settings. Tofsee has been known to spread through malicious email attachments, infected software downloads, and drive-by downloads from compromised websites. It can also persist on a system even after a reboot and can hide its presence from antivirus software. Upon execution, it drops multiple files onto the system and modifies the registry to ensure persistence. Tofsee uses a combination of stealth techniques to avoid detection, such as process hollowing, code obfuscation, and anti-debugging measures. This malware can cause major damage, such as financial loss and computer infections. It is used by cybercriminals to generate as much revenue as possible. The program is likely to install unintentionally, causing a slew of issues for both the system and other users. Tofsee is also capable of injecting unwanted advertisements into web pages visited by the infected user and redirecting browser traffic to malicious websites.

In terms of mitigation, it is crucial to keep software and operating systems up to date, avoid downloading suspicious files, and use a reputable antivirus program

Impact

• Information Theft
• Credential Theft
• Crypto-Mining

Indicators of Compromise

MD5

• 495a1ea939030ecab57ad60549837e0d
• b77532ec1efccdf8ad339e0db4a94526
• 8c0518e91b11908548df5ded37899a6d
• de716bcd69eaa397ec668a600e290613

SHA-256

• 2dd452add7571434898c24c9bdb636627b929b7620a3bcb36c3080b86def4818
• 2897b33a90e8350a536169c6fd0d858bba5b33614f36c51eacf309a1a3bd6f36
• ed3341bb3db572210528590643bca9c8f1045b2e161c2493aa39d0c646d22477
• 2c56b7eecbb1f8bf1ffab07fe19f92dc17f91675cf518565c67bb06af8b11916

SHA-1

• 921ffb10aef3937bef3a160b4d5f405fa4802b13
• bfe6a2ad2d18e5ad61c4bd1e7b5ee315b76f10b3
• 0fd3849d649ce01b458339cb3caa36cd5e1393a6
• 4fe4841959d458f6389ad15767eaccaf13d013f8

Remediation

• Block all threat indicators at your respective controls.
• Search for Indicators of compromise (IOCs) in your environment utilizing your respective security controls
• Maintain cyber hygiene by updating your anti-virus software and implementing a patch management lifecycle.
• Maintain Offline Backups – In a ransomware attack, the adversary will often delete or encrypt backups if they have access to them. That’s why it’s important to keep offline (preferably off-site), encrypted backups of data and test them regularly.
• Emails from unknown senders should always be treated with caution.
• Never trust or open ” links and attachments received from unknown sources/senders.
• Patch and upgrade any platforms and software timely and make it into a standard security policy. Prioritize patching known exploited vulnerabilities and zero-days.
• Along with network and system hardening, code hardening should be implemented within the organization so that their websites and software are secure. Use testing tools to detect any vulnerabilities in the deployed codes.
• Enable antivirus and anti-malware software and update signature definitions in a timely manner. Using multi-layered protection is necessary to secure vulnerable assets