Malicious Office (OLE) / .XLSX — malware analysis report

Static analysis result for SHA-256 4d6e04b402dba764…

MALICIOUS

Office (OLE) / .XLSX

46.0 KB First seen: 2022-08-11
MD5: 54a7bee5eb2f1d1d86fd493082c86c9b SHA-1: 720d9c99a331fabf2d0666f29b5090a8e1b9b7fd SHA-256: 4d6e04b402dba76475062aa889e4e58b0444aec20500016ad151bad4d10553ef
142 Risk Score

Malware Insights

The file is an Office document encrypted with a default password, indicating it's likely an exploit carrier. The critical heuristic firing for CVE-2017-0199 confirms it uses OLE2Link and URL Moniker to load a remote payload from the specified URL. This suggests a downloader or initial access mechanism for further compromise.

Heuristics 5

  • OLE2Link / URL Moniker → remote loader — CVE-2017-0199 critical CVE likely CVE_2017_0199
    Document contains an embedded OLE link object whose URL Moniker points to a remote URL. When the host file is opened, Office follows the link, downloads the URL, and processes the response based on its Content-Type (HTA -> mshta.exe, RTF → Word, etc.) — the documented CVE-2017-0199 primitive. The URL extension is not a reliable filter; servers can return different payloads to Office's user agent.
  • Default-encrypted OOXML exploit carrier layout high OOXML_ENCRYPTED_EXPLOIT_CARRIER_SHAPE
    Default-password encrypted OOXML package contains embedded OLE object parts and additional activation/decoy parts. This layout is common in malicious Excel exploit delivery and requires inspecting the decrypted package.
  • Office document is password-encrypted medium OFFICE_ENCRYPTED_PACKAGE
    OLE container holds MS-OFFCRYPTO encrypted package (Standard Encryption (Office 2007, AES)).
  • Office OOXML encrypted with default VelvetSweatshop password medium OFFICE_DEFAULT_PASSWORD_ENCRYPTED_OOXML
    OLE EncryptedPackage decrypts with Excel's built-in VelvetSweatshop password. Office opens this transparently, and malware uses it to hide OOXML exploit parts from scanners that only inspect the outer OLE container.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://jmcglone.com@192.210.149.222/www_http/https_b/www.doc