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

Static analysis result for SHA-256 2c7ab24dbe7886ea…

MALICIOUS

Office (OOXML) / .XLSX

626.8 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-08-02
MD5: 2ab008ab0e63327db4b16ee6d2ff2d84 SHA-1: 1ec5869398489a5088655cc7b06bbe3963fcd0e5 SHA-256: 2c7ab24dbe7886ea5bc9d2c4bd72142b8c79b73f1b76db13ea979f1a1cb83ead
100 Risk Score

Malware Insights

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

The file is an Excel document containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream, suggesting it's being used to exploit a vulnerability. The anomaly in the Ole10Native header and the size discrepancy further support this. This points to an attack pattern leveraging the Equation Editor vulnerability to deliver a malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/7GBKMKp.OJzZ9oJ 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
3b470c45d1581ef17fe9c769f948e06b883f6b66be86b17d3d5f7f78fc133e96		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/7GBKMKp.OJzZ9oJ 849920 bytes
ooxml_oleobject_00_ole10native_00.bin
39fbaf18b5a7296c38e2558a73fc95d35f8c0a7cf94c24b63364e831e6366993		 ole-package OOXML xl/embeddings/7GBKMKp.OJzZ9oJ Ole10Native stream: Ole10nAtIVe 841177 bytes

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