Rewterz Threat Alert – LockBit Ransomware – Active IOCs

Severity

High

Analysis Summary

LockBit ransomware takes as little as five minutes to deploy the encryption routine on target systems once it lands on the victim network. LockBit attacks leave few traces for forensic analysis as the malware loads into the system memory, with logs and supporting files removed upon execution. In one case, researchers found that the attack began from a compromised Internet Information Server that launched a remote PowerShell script calling another script embedded in a remote Google Sheets document. This script connects to a command and control server to retrieve and install a PowerShell module for adding a backdoor and establishing persistence. To evade monitoring and go unnoticed in the logs, the attacker renamed copies of PowerShell and the binary for running Microsoft HTML Applications (mshta.exe); this prompted Sophos to call this a “PS Rename“ attack. The backdoor is responsible for installing attack modules and executes a VBScript that downloads and executes a second backdoor on systems restart.

LockBit strives to target different sectors throughout the world and has just rebranded for the second time. Operators and affiliates behind the LockBit ransomware started transitioning to LockBit 3.0 around June 2022. LockBit 3.0, also known as LockBit Black, is active and out there, and the BFSI Sector makes up 1/3rd of its victims. This latest LockBit version has a new extortion model that allows them to purchase stolen data during attacks. Rapid affiliate adoption of LockBit 3.0 has resulted in a large number of victims being identified on the new “Version 3.0” leak sites, a collection of public blogs that identify non-compliant victims and release extracted data.

In September 2022, researchers discovered that LockBit 3.0 ransomware is being delivered in Word document format while masquerading as job application emails in NSIS format.

The particular distribution method has not yet been discovered, but given that the file names include people’s names, such as ‘Lim Gyu Min.docx’ or ‘Jeon Chae Rin.docx,’ it is possible that they were spread disguised as job applications, as in previous occurrences.

It was recently discovered that LockBit 2.0 and LockBit 3.0 are being distributed once more with merely a filename change. The latest versions are being delivered using phishing emails that seem like job applications, compared to earlier examples where word files or emails with copyright claims were utilized.

LockBit has recently been distributed without restriction to version or identical filename. 

Therefore, users must examine the file extensions of document files, update apps and V3 to the newest version, and be very cautious when opening files from unidentified sources.

ransom note:

Impact

• Security Bypass
• Information Theft
• Files Encryption

Indicators of Compromise

MD5

• ebe673b2ee28dd65565f2f389279ac47
• 2c0eeb266061631845a9e21156801afd
• 00a50f67d713a45cea6dc956c30042c1

SHA-256

• 0b856337d9d3255fc3b07635fdadecbe83e23eb5c205eccab83c21c2fb76edc9
• f90a8c639faa632eab2cf4a0a734c3450468a0bea83e6080fd928abba8dd2bb7
• c597c75c6b6b283e3b5c8caeee095d60902e7396536444b59513677a94667ff8

SHA-1

• bcebe09c61d3e6c47aefcb6bca0882752e0053a9
• e112623223602cbcdd95268121c9ea332ba5983e
• bf02ef3db484122b551da73ce83c2aac79bbd2fc

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 implement 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.
• Users should upgrade their applications and V3 to the most recent version and avoid opening documents from unknown sources.
• Never trust or open ” links and attachments received from unknown sources/senders.