Analysis Summary

MassLogger, a .NET credential stealer, is a keylogger and stealer malware. MassLogger's prime objective is data extraction or information theft, such as bank account and/or credit card details. This malware was published in April 2020 and was offered for a moderate price on underground forums with a few license choices. It starts with a launcher that employs rudimentary anti-debugging techniques that may be readily bypassed if detected. Eventually, the first stage loader XOR decrypts the second stage assembly, which then decrypts, loads, and executes the final MassLogger payload.

MassLogger targets a wide range of apps to steal login credentials and other sensitive information. It obtains and exfiltrates user credentials from a variety of sources, including Microsoft Outlook, Google Chrome, Mozilla Firefox, and instant messengers.

Impact

• Financial Theft
• Information Theft

Indicators of Compromise

MD5

• d41daf45d3b22889ebcfde25a916b4b3

• ee239561fa5253af6cde008e1b0892cb

• 31a03c972a785323dfde0d548c06472c

• ffcad238212a7ff764048193d3755b6d

• fa67902403f1780fa1785776c80ff5ef

SHA-256

• 01d2a1a833ec8f6917fb3963a53bef376b35037c6d32cc7bc81ba577a9fdc1dc

• 0a1eadcceee3f37f895ee23bb8458140090cf58b411e57ec262dc28e76076de5

• 50bb07e7181aded9da9977ac3dcc3192e8543bf3f73eec412a89ff2647ed4537

• 1336ab650908b4c79136b1cb0c2acdb5f84693c74f6a9767019a5d588bf04378

• 841f234cf1a9cacee57d6a35fa8bde6f73ba02f08ac26c678f399be82ceadd88

SHA1

• b6005a55a253d84fa00d69fbb1d1f2975402d760

• a2049d0e9136c1cb039607767c6af7922b91c479

• 9babb2b3ebd4d68a76daf39604e5098b3916b156

• 7701dd8e48ebf4ba710c3a43be3d6bf2d9da5db7

• 97db1feb2f8533e8421aa09f05497faaa6de7971

Remediation

• Block all threat indicators at your respective controls.
• Search for indicators of compromise (IOCs) in your environment utilizing your respective security controls.
• Emails from unknown senders should always be treated with caution.
• Never trust or open " links and attachments received from unknown sources/senders.
• Ensure that general security policies are employed including implementing strong passwords, correct configurations, and proper administration security policies.
• Limit access to administrative accounts and portals to only relevant personnel and make sure they are not publicly accessible.
• Patch and upgrade any platforms and software on time and make it into a standard security policy. Prioritize patching known exploited vulnerabilities and zero-days.
• Enable antivirus and anti-malware software and update signature definitions on time. Using multi-layered protection is necessary to secure vulnerable assets.