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

• 6ef40e3c2b94020f46e2b0a9a5cf6bad

• 47010c42c30109aa25fa10bb4038f404

• 6dbb8752f59171b8056302eb193d7340

SHA-256

• 5d02937446d2031b8d6f28d4dab29da62a1358864bca30cb1ebb3355478d3140

• bf9317a764ca6548a8f1c084b357da6969b6c4d4994abb704155a4a1e9ccc401

• fbb2b930a5ee2aa5b2b70e7d72af82982dec10cb8ac3b8f8a64ab3be2d0b5edb

SHA1

• f66cea790933cdb57eec28c05e969fa3b166622d

• 66aed35bda17c06683ce39939c8d554f6af6c892

• 5411d39fbfe4d3f9da70437c67da1e6cf3311e95

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.