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

Static analysis result for SHA-256 7a65cf01262984cb…

MALICIOUS

Office (OLE) / .XLSX

171.0 KB
MD5: 0f0653be11b0eb565c908126f4042bc1 SHA-1: 945f516cd4a9da9ed9acc1652692e08568f748f0 SHA-256: 7a65cf01262984cb514a113353deee1a8b5ed8e998b014f07eb52a68d53fa2f1
142 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The critical heuristic firing for CVE-2017-0199 indicates that the sample is designed to exploit a vulnerability in OLE linking to load a remote resource. The embedded URL, https://rb.gy/h5ji2n, is likely the initial stage of this payload delivery. The document is also encrypted, which is a common tactic to evade static analysis.

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-128)).
  • 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://rb.gy/h5ji2n In document text (OLE body)

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