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

Static analysis result for SHA-256 a4f65aa0709e427a…

MALICIOUS

Office (OLE) / .XLSX

404.0 KB
MD5: 73dd2d49cbea9624d8aa39b5a45bdcdb SHA-1: b5810fc40e72e9dacaa847479fa64cbfed339f4e SHA-256: a4f65aa0709e427a1ac2f214cf3f9b1220c044da1cddb39547f0199e8da86065
120 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution

The critical heuristic firing indicates exploitation of CVE-2017-0199 via an OLE object, which is designed to load a remote resource. The embedded object's URL points to a suspicious external domain, likely serving as a downloader for a second-stage payload. The document is encrypted with a default password, a common tactic for obfuscating malicious content.

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://syr.us/gPn
  • 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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