Lukitus Ransomware is a new variant of Locky Ransomware that encrypts user’s data and appends the [.]lukitus file extension. Lukitus Ransomware encrypts personal photos, videos, and documents of the victim and changes the names of the files into random characters and numbers, followed by the [.]lukitus file extension.
ARRIVAL AND INSTALLATION
Lukitus Ransomware infection chain
The infection chain of Lukitus Ransomware begins with a socially-engineered email that contains a malicious MS Office file or a ZIP/RAR attachment with embedded malicious JS/VBS scripts. It may also arrive as a spoof drop box notification email.
When the malicious file is executed, it connects to a URL hosting the main ransomware file (Lukitus) and downloads it. Then, it encrypts the files as well as the network shares on the machine. The main binary of the ransomware then self-destructs after executing its payload.
Encrypted files by Lukitus Ransomware
Lukitus Ransomware Ransom Notes
TREND MICRO PRODUCT SOLUTIONS
Below are the available Trend Micro product solutions for Lukitus/Locky Ransomware:
Messaging products such as IMSVA and SMEX can block spam mails related to this ransomware. It checks for email reputation and web reputation of the embedded links, file attachments, as well as macros in MS Office documents.
Files related to this ransomware are detected as the following:
- Downloaders (detected using OPR 13.603.00)
- Lukitus Ransomware (All samples are now detected using OPR 13.637.00)
Detections were renamed from Ransom_CERBER.SMALY0.
Predictive Machine Learning is a powerful tool that helps protect your environment from unidentified threats and zero-day attacks. It performs a behavioral analysis on unknown or low-prevalence processes to determine if an emerging or unknown threat is attempting to infect your network.
Predictive Machine Learning detects Lukitus ransomware related files as the following:
Web Reputation Services evaluates the potential security risk of all requested URLs at the time of each HTTP request. Depending on the rating returned by the database and the security level configured, web reputation either blocks or approves the request.
Web Reputation service already blocks all of the known URLs associated with Lukitus ransomware.
DDI is helpful in identifying the impacted machines on the network because it has the following detection rules for this ransomware:
- Trend Micro URL Filtering Engine (TMUFE)
- C&C Server URL in Web Reputation Services database - HTTP (Request)
- Dangerous URL in Web Reputation Services database - HTTP (Request)
- Ransomware URL in Web Reputation Services database - HTTP (Request)
- Threat Detection Rules
- LOCKY - Ransomware - HTTP (Request) - Variant 2 - Rule ID: 2116
It was previously detected by the following rules:
- CERBER – Ransomware - HTTP (Response or Request) - Rule ID: 2359 and 2338
- CERBER - Ransomware - UDP - Rule ID 2071
Deep Security has an IPS solution that can help detect and block Locky Ransomware-associated network traffic.
Instructions on how to enable this feature can be viewed from this link: Ransomware Detection and Prevention in Deep Security.
BEST PRACTICES FOR IT ADMIN
- Optimize email security. Blocking malicious emails at the gateway level before they can even reach the users will help prevent malware infections.
- Review the need for VBS and JS scripting in the machine. If it is not needed, you can disable it to reduce the risk of malware infection.
- Officecan Behavior Monitoring can block wscript/cscript on the machine: Blocking .vbs malware by disabling the Windows Script Host (WSH) in OfficeScan (OSCE)
- Microsoft also provides a guide on how to disable wscript in the computer: Disabling Windows Script Host
- Don’t enable macros in MS Office file attachments received via email.
- Restrict write permissions on the file server if possible. Ransomware encrypts files for both local and network shares with write permissions.
- Back up files. Cybercriminals use the potential loss of important and personal data as a fear-mongering tactic to coerce victims into paying the ransom. Organizations and end users can back up files to remove their leverage. Keep at least three copies, with two stored in different devices, and another in an offsite or safe location.
- Do Patch Management. It is highly recommended to keep application patch levels up-to-date as a lot of malware use these vulnerabilities to compromise your machine. Examples of critical applications are Java, Adobe, and your Internet Browser.
- Educate users about social engineering attacks. Getting infected by Ransomware is an indication that the user is not security aware. The user may receive spam mail and open the attachment without knowing the risks involved.