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

Static analysis result for SHA-256 5345fe4dbe54377b…

MALICIOUS

Office (OLE) / .XLSX

404.0 KB
MD5: 53c716ff65d56970de3c272b9d3225e0 SHA-1: 135fff3948844a40f71ce462e237ec5a745b7cab SHA-256: 5345fe4dbe54377b8f71447057b16ab4174510f6e7287fee9a7d5fbdb4834644
120 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File

The critical heuristic firing indicates exploitation of CVE-2017-0199 via a URL Moniker, which is designed to download and execute a remote loader. The document is an encrypted OOXML exploit carrier, further supporting this attack vector. The embedded URL is the primary indicator for the second-stage payload.

Heuristics 3

  • 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.
    URL https://bribble.com/j1Lqp
  • 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 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.

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