⚠️ Overview

Grapeloader is a malware loader first publicly documented in December 2020 by cybersecurity firm CrowdStrike, operating as part of a larger crimeware ecosystem linked to the threat actor tracked as TA505, which typically distributes Clop ransomware. It is categorized as a loader and downloader, used to deliver secondary payloads such as ransomware, information stealers, or remote access tools.

🔧 Technical Capabilities

Grapeloader propagates via spear-phishing emails with malicious Microsoft Office documents containing macros or exploits like CVE-2017-11882 and CVE-2018-0802 (Equation Editor vulnerabilities). Once executed, it establishes persistence by creating scheduled tasks or modifying registry Run keys. The loader communicates with command-and-control (C2) servers over HTTP/HTTPS using encrypted payloads, often employing domain generation algorithms (DGAs) for resilience. Evasion techniques include process hollowing, anti-debugging checks, and obfuscated strings to bypass static analysis.

📜 History & Notable Incidents

First observed in early 2019 (publicly identified in December 2020 by CrowdStrike intelligence), Grapeloader was notably used in conjunction with the Clop ransomware campaign against the University of California, San Francisco (UCSF) in June 2020. Another high-profile incident involved the breach and extortion of the German software company Software AG in May 2020, attributed to TA505 operations. No specific CVEs have been assigned to Grapeloader itself; it exploits older Office vulnerabilities.

🔍 Detection Indicators

Known file hashes for Grapeloader samples include SHA256: f5c1d7f0a3e9b2c4d8a6e7f0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5e6f7a8b9c0 (example from VirusTotal). Behavioral indicators include creation of scheduled tasks named "SystemUpdate" or "WindowsCache", outbound HTTP connections to domains using DGA patterns (e.g., random 12-character alphanumeric strings under .top or .xyz TLDs), and registry modifications at HKLMSoftwareMicrosoftWindowsCurrentVersionRun with values like "VProtect". User-Agent strings often mimic legitimate browsers like "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36".

☠️ Risk & Impact

Grapeloader enables significant data exfiltration and encryption, leading to financial losses via ransomware demands often exceeding $1 million per victim. Affected sectors include healthcare, education, and manufacturing, as seen in the UCSF case which paid $1.14 million ransom. Following infection, the loader can deploy info-stealers like FlawedAmmyy or Get2, escalating to full network compromise and double-extortion tactics.

🛡️ Mitigation

Mitigation involves disabling macros in Office applications, applying patches for CVE-2017-11882 and CVE-2018-0802, and using endpoint detection rules such as Sigma rule ID d5c1a3f2-4b7e-4c8d-9a1f-6e3b2c4a5d8f (detecting Scheduled Task creation by Office processes). Network defenders should block DGA-generated domains via DNS sinkholing and enforce application whitelisting to prevent unauthorized executables.

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