CVE-2026-8398

# Detection script for CVE-2026-8398 # This script checks the file hashes of the compromised binaries against known bad hashes (Placeholders). import hashlib import os # Simulated known bad hashes (replace with actual hashes from advisory) KNOWN_BAD_HASHES = { "DTHelper.exe": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855", "DiscSoftBusServiceLite.exe": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855", "DTShellHlp.exe": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855" } def calculate_file_hash(filepath): sha256_hash = hashlib.sha256() with open(filepath, "rb") as f: for byte_block in iter(lambda: f.read(4096), b""): sha256_hash.update(byte_block) return sha256_hash.hexdigest() def check_installation(directory): print(f"Scanning directory: {directory}") for filename, bad_hash in KNOWN_BAD_HASHES.items(): filepath = os.path.join(directory, filename) if os.path.exists(filepath): file_hash = calculate_file_hash(filepath) if file_hash == bad_hash: print(f"[ALERT] {filename} is compromised! Hash matches known bad version.") else: print(f"[OK] {filename} hash does not match known bad version.") else: print(f"[INFO] {filename} not found in directory.") if __name__ == "__main__": # Example path, replace with actual installation path check_installation("C:\\Program Files\\DAEMON Tools Lite")

{"cve": {"id": "CVE-2026-8398", "sourceIdentifier": "[email protected]", "published": "2026-05-15T09:16:17.653", "lastModified": "2026-05-15T09:16:17.653", "vulnStatus": "Received", "cveTags": [], "descriptions": [{"lang": "en", "value": "A supply chain attack compromised the official installation packages of DAEMON Tools Lite (Windows versions 12.5.0.2421 through 12.5.0.2434), distributed from the legitimate website daemon-tools.cc between approximately April 8, 2026, and May 5, 2026. Attackers gained unauthorized access to the vendor's (AVB Disc Soft) build or distribution infrastructure and trojanized three binaries: DTHelper.exe, DiscSoftBusServiceLite.exe, and DTShellHlp.exe. These files were digitally signed with the legitimate AVB Disc Soft code-signing certificate, allowing the malicious installers to appear trustworthy and bypass signature-based detection."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 9.3, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-506"}]}], "references": [{"url": "https://blog.daemon-tools.cc/post/security-incident", "source": "[email protected]"}, {"url": "https://securelist.com/tr/daemon-tools-backdoor/119654/", "source": "[email protected]"}]}}