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

Static analysis result for SHA-256 8fcb5cd69cf08005…

MALICIOUS

Office (OOXML) / .XLSX

623.6 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-29
MD5: 69d01dde09ef69bdb6a4e36ae4a2a0f9 SHA-1: 61e482d2250056dae5f58c612ea2f3a3fb784fe2 SHA-256: 8fcb5cd69cf080056201702232aa7e15c2d0a814d5baefae04432d816962156b
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.001 User Execution: Malicious Link

The sample is an Office document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's designed to exploit a vulnerability. The large size difference between the declared inner size and the actual stream size further supports this. This indicates the document is likely a dropper or exploit document leveraging the Equation Editor vulnerability to execute a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/b90e16mi.vdR 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
5a9f6e1e19bdb34a80f81f6dae42cdf03a1a6c6109a45a5af097bc65cef9887d		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/b90e16mi.vdR 919040 bytes
ooxml_oleobject_00_ole10native_00.bin
9cce0d554727859b08e20616830ba52d559388fec12769fc9b1d142ff79d78d0		 ole-package OOXML xl/embeddings/b90e16mi.vdR Ole10Native stream: ole10NaTiVE 908915 bytes

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