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

Static analysis result for SHA-256 e4ae583220dbe65e…

MALICIOUS

Office (OLE) / .XLSX

58.0 KB First seen: 2022-07-26
MD5: 49f1053c0f61e3f3d5528a5839f5527e SHA-1: 90f73b8d5529128813feda6a745849a7d1931b96 SHA-256: e4ae583220dbe65ea35627d890a34eb5196c72cf684e2c3c79b2b5c6bd7e8f87
202 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 User Execution: Malicious File T1204 Malicious File T1059 Command and Scripting Interpreter

The file is an encrypted Office document identified as a downloader by ClamAV. It exploits CVE-2017-0199 via an OLE2Link object to fetch a secondary payload from the URL http://23.95.52.140/shipping/doc2/receipt.docx. The encryption and exploit carrier structure strongly indicate malicious intent.

Heuristics 6

  • 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.
  • ClamAV: Xls.Downloader.94c25b356b5a6cac-9978798-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.94c25b356b5a6cac-9978798-0
  • 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://23.95.52.140/shipping/doc2/receipt.docx

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