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

Static analysis result for SHA-256 504d3ce6bb189dc7…

MALICIOUS

Office (OLE) / .XLSX

20.4 KB First seen: 2022-06-23
MD5: ccccb9d321d7dd9db687ec43134dd3b4 SHA-1: 9ad59812cd5f0bcbdda30947c85df7934e0f44d9 SHA-256: 504d3ce6bb189dc7af92e0d9f20e3d09d8773d78b6ea3517c74ad88e928300ab
202 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.001 PowerShell

This Office document is encrypted and contains an embedded OLE object that exploits CVE-2017-0199. The exploit carrier points to a remote URL, indicating it is designed to download and execute a second-stage payload. The document's structure and the specific CVE exploited suggest a downloader or initial access mechanism. No scripts were extracted, but the presence of the exploit and the embedded URL are strong indicators of 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.
  • Encrypted Office package with CFB FAT corruption critical OLE_ENCRYPTED_AND_MALFORMED
    Encrypted-package shape co-occurs with FAT-chain corruption — the documented combined evasion form.
  • 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 https://htmlpreview.github.io@url.pm/Yl7EU

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