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

Static analysis result for SHA-256 1a4e64092ebc77de…

MALICIOUS

Office (OLE) / .XLSX

44.0 KB First seen: 2022-08-15
MD5: 93a2fa2b0dff0f2a9d11a7fdf1c821f2 SHA-1: 4a9725d082c269de41f358d67c15fc7cf36ba957 SHA-256: 1a4e64092ebc77ded3525862567633672135252d7e98911ad045a37d76f97ca2
142 Risk Score

Malware Insights

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

The critical heuristic firing for CVE-2017-0199 indicates that this OLE file is designed to act as a remote loader. It embeds a URL that points to a remote document, which is likely a second-stage payload. The document is encrypted with a default password, a common technique to hide malicious content.

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@23.95.34.121/hp/www_s/https.doc

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