{"id":840,"date":"2025-07-07T07:21:24","date_gmt":"2025-07-07T07:21:24","guid":{"rendered":"https:\/\/reversea.me\/?p=840"},"modified":"2025-07-07T07:21:24","modified_gmt":"2025-07-07T07:21:24","slug":"extracting-cryptographic-keys-from-windows-live-processes-with-keyreaper","status":"publish","type":"post","link":"https:\/\/reversea.me\/index.php\/extracting-cryptographic-keys-from-windows-live-processes-with-keyreaper\/","title":{"rendered":"Extracting Cryptographic Keys from Windows Live Processes with KeyReaper"},"content":{"rendered":"Reading Time: <\/span> 4<\/span> minutes<\/span><\/span>\n

TL;DR<\/strong>: Ransomware encrypts victims’ files with keys that must exist in memory at runtime. If defenders can access those keys while the malware is still running, they could decrypt files without paying a ransom. We introduce KeyReaper<\/code><\/a>: a live memory analysis tool designed to extract cryptographic keys from running Windows processes in real time. By targeting heap memory and using key-specific heuristics, KeyReaper<\/code> enables fast and reliable key recovery, even in real-world ransomware cases like WannaCry or Avaddon. If you’re curious to learn more, visit our poster session at DIMVA 2025<\/a> this week or read the full paper here<\/a> (or here<\/a>) or our poster here<\/a>.<\/p>\n\n\n\n

Ransomware’s Achilles’ Heel: Runtime Keys in Memory<\/h2>\n\n\n\n

Ransomware continues to dominate the cyberthreat landscape, attacking availability by encrypting files and holding them hostage. While attackers often employ strong cryptographic algorithms, those keys must be generated and stored in memory during execution. This brief moment offers a unique opportunity for defenders.<\/p>\n\n\n\n

Traditionally, forensic analysts have relied on static, often post-mortem, memory dumps, which limits their effectiveness. But what if we could pause ransomware during execution, inspect its memory in real time, and extract the encryption keys directly? That’s the core idea of \u200b\u200bKeyReaper<\/a><\/code>.<\/p>\n\n\n\n

Meet KeyReaper<\/h2>\n\n\n\n

KeyReaper<\/code> is an open-source tool specifically designed to locate cryptographic keys in active Windows processes using live memory analysis. It does not detect ransomware, but is designed to be deployed after an antivirus or EDR solution detects a process.<\/p>\n\n\n\n

The tool focuses on heap memory, where dynamic key material is typically stored during encryption operations. By limiting the scope, KeyReaper<\/code> improves performance and accuracy while minimizing false positives.<\/p>\n\n\n\n

KeyReaper<\/code> is structured around three main modules, as depicted in Figure 1:<\/p>\n\n\n\n