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

Static analysis result for SHA-256 62e7bc96d50baa74…

MALICIOUS

Office (OOXML) / .XLSX

701.0 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2024-05-21
MD5: a24c0a550d609fa7c66fb4d7d65cdd48 SHA-1: a6b1c72b3802f563141b5f0c136f9826d03e30ab SHA-256: 62e7bc96d50baa74507abaa2d984c04ce743d87551f44d59703584c09e31766a
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The file is an Excel document containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. This object carries a payload-like Ole10Native stream, indicating it's designed to exploit a known vulnerability to execute arbitrary code. The high entropy of the stream further suggests it contains packed or encrypted malicious content.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/d3y.rP contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY
    Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
740b748b1421aebb4f995a5b35ab5acc50423b0a4ed5aaae6e6bfb76f881e483		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/d3y.rP 934912 bytes
ooxml_oleobject_00_ole10native_00.bin
f1ee7349b4e0dc450fef86df5dc5bde49431a09ab46d71277e537a94becce742		 ole-package OOXML xl/embeddings/d3y.rP Ole10Native stream: OlE10NATivE 925025 bytes

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