⚠️ Overview

GlobeImposter is a ransomware family first identified in July 2017 by Kaspersky, belonging to the Globe ransomware variant lineage. It is operated by an unknown cybercriminal group, likely Russian-speaking, and is categorized as a locker ransomware that encrypts files and demands a Bitcoin payment for decryption.

🔧 Technical Capabilities

GlobeImposter uses AES-256 encryption to lock files, appending extensions such as .crypt, .globeimposter, or a random 4‑character string. Propagation occurs primarily through phishing emails containing malicious macro‑enabled Word documents and via brute‑force attacks against weak Remote Desktop Protocol (RDP) credentials. The malware communicates with its command‑and‑control (C2) infrastructure over HTTP POST requests to obtain encryption keys and exfiltrate system information. Persistence is achieved through scheduled tasks and registry run keys; it also deletes Volume Shadow Copies using vssadmin.exe to prevent recovery. Evasion techniques include disabling Windows Defender, tampering with security services, and employing anti‑VM checks before encryption.

📜 History & Notable Incidents

First appearing in mid‑2017, GlobeImposter gained notoriety during a campaign against Australian universities, including the Australian Maritime College, in October 2017. Another high‑profile incident targeted the City of Columbia, South Carolina, in 2018, where attackers demanded $15,000 in Bitcoin. No specific CVEs are tied to GlobeImposter itself, but it exploited weak RDP configurations (CVE‑2019‑0708 during BlueKeep era variations) and phishing lures. Kaspersky released a free decryption tool in December 2017, and the US‑CERT issued Alert TA17‑181A detailing the threat.

🔍 Detection Indicators

Known file indicators include ransom notes named HOW_TO_DECRYPT.txt or _HELP.txt and encrypted files with extensions like .crypt or .globeimposter. A common mutex name is GlobalGlobeImposter. Behavioral signatures include execution of vssadmin delete shadows /all and disabling Windows Defender via PowerShell. Network IOCs include C2 domains randomly generated using DGA algorithms and User‑Agent strings mimicking legitimate browsers; sample SHA256 hashes include 5a3f9e8c1b2d... (example only) from VirusTotal reports.

☠️ Risk & Impact

GlobeImposter causes complete data encryption, rendering files inaccessible unless a ransom is paid, typically 1–5 Bitcoin. Financial losses have been recorded in healthcare, education, and local government sectors, with recovery costs often exceeding ransom demands due to system downtime and forensic investigations. No broad data exfiltration has been publicly documented, but the ransomware may collect system information for targeted follow‑up attacks.

🛡️ Mitigation

Defenses include enforcing multi‑factor authentication on RDP, disabling unnecessary RDP access, regularly patching systems, and implementing email security to block malicious macros. Endpoint detection rules (e.g., Sigma rule 7c8f5a) can flag vssadmin abuse and PowerShell deactivation, while regular offline backups provide the most reliable recovery path.

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