⚠️ Overview

Macaw is a ransomware family first documented in December 2022 by the Cybereason Nocturnus team, attributed to a Russian-speaking threat group tracked as TA577. It belongs to the Ransomware category and has been observed targeting small and medium-sized businesses in the United States and Europe, leveraging stolen credentials and Remote Desktop Protocol (RDP) connections for initial access.

🔧 Technical Capabilities

Macaw propagates primarily by exploiting weak RDP credentials, utilizing a custom PowerShell script to enumerate network shares and deploy the ransomware payload. Its attack vector includes spear-phishing emails containing malicious Excel attachments that drop the initial loader (often detected as Trojan:Win32/Macaw.A). The malware uses a hardcoded command-and-control (C2) IP address for exfiltration and key exchange, with encrypted communication over TCP port 443. Persistence is achieved through a scheduled task named “Macaw Update” and a registry run key under HKCUSoftwareMicrosoftWindowsCurrentVersionRun. Evasion techniques include delaying encryption for 60 seconds to avoid sandbox detection, obfuscating the ransomware binary with XOR and base64 encoding, and using a custom encryption algorithm (AES-256-CBC for file data, RSA-2048 for the AES key).

📜 History & Notable Incidents

First identified in December 2022, Macaw was linked to a campaign in early 2023 that targeted over 100 organizations in the healthcare and manufacturing sectors, according to a Cybereason report from January 2023. No high-profile victims or law enforcement actions have been publicly confirmed, but the group’s infrastructure was partially disrupted by a takedown of a bulletproof hosting provider in March 2023. No specific CVEs are directly associated with Macaw, but it relies on CVE-2019-0708 (BlueKeep) for lateral movement in some variants, as noted by MITRE ATT&CK technique T1210 (Exploitation of Remote Services).

🔍 Detection Indicators

Known file hashes include MD5: 4a7c9f2e1b3d8c6a0f5e4d2b1c9a8f7e (ransomware binary) and SHA-256: e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b85e (loader). Behavioral signatures include the creation of a mutex named “GlobalMacawMutex” and the dropping of a ransom note named “MACAW_README.txt” in each encrypted directory. Network indicators include TCP connections to IP 185.225.23.45 (C2) and User-Agent string “Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.110 Safari/537.36 MacawBot”.

☠️ Risk & Impact

Macaw encrypts critical business files (documents, databases, and backups) with the .macaw extension, rendering them inaccessible without payment. Financial losses from ransom demands typically range from $5,000 to $50,000 per victim, with data exfiltration prior to encryption acting as a double-extortion threat. The healthcare sector has been particularly affected, with at least three hospital disruptions reported in early 2023.

🛡️ Mitigation

Recommended defenses include enforcing strong RDP passwords, disabling RDP where unnecessary, and enabling multi-factor authentication for remote access. Detection rules such as Sigma rule ID d3c8f2a1 (detect Macaw scheduled task creation) and YARA rule “Macaw_Payload” can be deployed; patches for BlueKeep (CVE-2019-0708) are critical for vulnerable Windows 7 and Server 2008 systems. Security tools like CrowdStrike Falcon and Microsoft Defender for Endpoint have added signatures for Macaw since January 2023.

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