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

Static analysis result for SHA-256 6eb428de0c5a04bb…

MALICIOUS

Office (OOXML) / .XLSX

620.4 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-19
MD5: a7be43b6c0c07ca83df1b743382063a2 SHA-1: 857f903eba27814a5c604d90fd1cf24bbfa33860 SHA-256: 6eb428de0c5a04bb2c6cb00b171fa424331ba11fc1f9784380f73df5b9d324a5
100 Risk Score

Malware Insights

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

The XLSX file contains 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 with an anomalous header, suggesting it's designed to exploit a vulnerability. This points to a likely attack pattern involving the exploitation of the Equation Editor to deliver a secondary malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/jI7WO.c7ZFJ 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
7f97e7f6bad03c5c15e24233cc16ff4cf0d844619f29608f08f07d9b757cf537		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/jI7WO.c7ZFJ 904192 bytes
ooxml_oleobject_00_ole10native_00.bin
8347098340279a8fb3629daa1e2a1611bd363dad42675f4d5db10ab4f1f23e18		 ole-package OOXML xl/embeddings/jI7WO.c7ZFJ Ole10Native stream: OLE10NaTiVe 894585 bytes

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