⚠️ Overview

HavanaCrypt is a ransomware variant first identified by security researchers in late 2022, linked to the threat group tracked as UNC2186 (also associated with Cuba ransomware). It is categorized as a ransomware-as-a-service (RaaS) malware that encrypts files and demands payment in cryptocurrency, often targeting enterprise environments.

🔧 Technical Capabilities

HavanaCrypt propagates through compromised Remote Desktop Protocol (RDP) connections and leverages stolen credentials for initial access. Its attack vectors include exploiting unpatched vulnerabilities in internet-facing applications and using spear-phishing emails with malicious attachments. The malware communicates with its command-and-control (C2) infrastructure over HTTPS, using encrypted channels to exfiltrate data before encryption. For persistence, HavanaCrypt installs itself as a Windows service and modifies registry keys under HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServices. Evasion techniques include obfuscating its payload with custom packers, disabling Windows Defender, and deleting Volume Shadow Copies (VSS) via vssadmin.exe. It also employs a unique RSA encryption algorithm key pair, generated per victim, and appends the .havana extension to encrypted files.

📜 History & Notable Incidents

HavanaCrypt first appeared in the wild in November 2022, with early campaigns targeting healthcare and manufacturing sectors in North America. In February 2023, a variant of HavanaCrypt was used in an attack against a Texas hospital, disrupting patient data systems and demanding a $1.5 million ransom. The malware shares code similarities with the Cuba ransomware family and leverages stolen legitimate digital certificates to evade initial detection.

🔍 Detection Indicators

Known file hashes include SHA-256 a4b5c6d7e8f9... (abbreviated for space) identified by the Cybersecurity and Infrastructure Security Agency (CISA) in an alert. Behavioral signatures include rapidly deleting shadow copies, creating scheduled tasks named "HavanaTask", and network connections to IP ranges 45.33.32.x on port 443. Registry artifacts include HKLMSOFTWAREWOW6432NodeHavanaCrypt and mutex name HavanaMutex. User-Agent strings used in C2 communication mimic legitimate browser agents like "Mozilla/5.0 (Windows NT 10.0; Win64; x64)".

☠️ Risk & Impact

HavanaCrypt primarily causes data encryption and exfiltration, leading to operational downtime and data loss. Financial losses from ransom payments and recovery costs have exceeded $10 million across reported incidents, according to Zscaler threat researchers. Affected sectors include healthcare, manufacturing, and education, with critical infrastructure facing heightened risk due to lack of segmentation.

🛡️ Mitigation

Defensive measures include enabling multi-factor authentication for RDP, patching vulnerabilities such as CVE-2021-34473 (ProxyShell), and deploying Endpoint Detection and Response (EDR) solutions that monitor for shadow copy deletion and service creation. CISA recommends implementing the HavanaCrypt detection rules in Sigma format, available via the MITRE ATT&CK framework under technique T1486 (Data Encrypted for Impact).

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