Locky Loader

Locky Loader is a type of malware used to deliver additional malicious payloads to infected systems. It is primarily associated with the distribution of Locky ransomware, a form of malware that encrypts files on a victim's computer and demands a ransom for their decryption. Locky Loader serves as the initial stage in the infection chain, facilitating the download and execution of the ransomware. As of October 2023, Locky Loader remains a subject of interest in cybersecurity research due to its role in facilitating ransomware attacks and its use of various evasion techniques.

Overview

Locky Loader is a malware component used to deliver additional malicious software to compromised systems. It is most notably associated with the distribution of Locky ransomware, which encrypts files on a victim's computer and demands payment for decryption. Locky Loader acts as the initial stage in the infection process, enabling the download and execution of the ransomware payload. The loader is designed to evade detection and ensure the successful delivery of its payload.

History

Locky Loader first emerged in 2016, coinciding with the rise of Locky ransomware. The loader was initially distributed through spam email campaigns, often disguised as legitimate attachments. Over time, the distribution methods evolved to include exploit kits and other delivery mechanisms. Locky Loader has been used in various campaigns, often targeting organizations and individuals indiscriminately.

Technical characteristics

Locky Loader is typically delivered as a malicious email attachment, often in the form of a Microsoft Word document with embedded macros. When the document is opened and macros are enabled, the loader executes a script that downloads the Locky ransomware from a remote server. The loader employs various evasion techniques, such as obfuscation and anti-analysis features, to avoid detection by security software.

Infection vector

The primary infection vector for Locky Loader is phishing emails. These emails often contain attachments or links that, when opened, execute the loader. The loader may also be distributed through exploit kits, which take advantage of vulnerabilities in software to deliver the malware. Once executed, Locky Loader downloads and installs the ransomware payload, initiating the encryption process.

Notable campaigns

Locky Loader has been used in several high-profile campaigns, often targeting a wide range of sectors. One notable campaign occurred in 2016, when the loader was used to distribute Locky ransomware to healthcare organizations, resulting in significant disruptions. Another campaign in 2017 targeted financial institutions, leveraging spear-phishing emails to deliver the loader and subsequent ransomware payload.

Detection and mitigation

Detecting Locky Loader involves monitoring for indicators of compromise, such as suspicious email attachments and network traffic patterns. Security solutions can be configured to block known malicious domains and IP addresses associated with the loader. Mitigation strategies include employee training to recognize phishing attempts, regular software updates to patch vulnerabilities, and the use of robust antivirus solutions to detect and block the loader before it can execute.

See also

• koi_loader
• kardon_loader
• hui_loader
• h1n1_loader
• godzilla_loader
• freenki_loader
• enigma_loader
• colibri_loader

Sources

• MITRE [ATT&CK - Locky](https://attack.mitre.org/software/S0154/)
• CISA - Ransomware
• Securelist - Locky Ransomware

This article provides an overview of Locky Loader, its history, technical characteristics, infection vectors, notable campaigns, and strategies for detection and mitigation.