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

Static analysis result for SHA-256 499b30583ce8d14c…

MALICIOUS

Office (OOXML) / .XLSX

603.5 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-26
MD5: 1c9035d5a7bef6ae4cd7e8dcd1d77e51 SHA-1: 7e307847f11a81f58021815f6e3fc3d1b14456f3 SHA-256: 499b30583ce8d14ce58535aa423294c61eefda4cbe4032a3926d6b2cb8e26520
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is an Excel spreadsheet containing an embedded OLE object, specifically identified as a malicious Equation Editor object. This object carries a payload-like Ole10Native stream with an anomalous header, indicating it's designed to exploit a vulnerability. The presence of this embedded malicious object strongly suggests an attack pattern involving the exploitation of the Equation Editor component to deliver a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/zLo.N1d38KB 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
1f33ce1fd08d583ce83ff869af3ceceaf279604336a15e3b13ccd8b3c033ea88		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/zLo.N1d38KB 907776 bytes
ooxml_oleobject_00_ole10native_00.bin
ce23cc7039df463177c3cc84ec0e51289945b43f7c62126c4648da3c0468a091		 ole-package OOXML xl/embeddings/zLo.N1d38KB Ole10Native stream: oLE10nAtIVE 898451 bytes

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