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

Static analysis result for SHA-256 a172f304b64c92f5…

MALICIOUS

Office (OOXML) / .XLSX

624.5 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-19
MD5: 494b84fc0f60f0d7bd5843eafe04d8e0 SHA-1: 3591b94d79071f547020301a0f469e1637d60b36 SHA-256: a172f304b64c92f595a35e1cdac455e091d98d72cb9389c38209788faf45f5eb
100 Risk Score

Malware Insights

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

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 being used to exploit a vulnerability. The large declared inner size compared to the stream size further supports this. This points to an attack pattern leveraging the Equation Editor vulnerability to execute a malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/T3n.uVXPYi 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
2f247cd47381eecc2952b9cf7fbae1f1d093d3a40f9bea9e168ddc09d9539d09		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/T3n.uVXPYi 848384 bytes
ooxml_oleobject_00_ole10native_00.bin
20798aba128a312dac08962c5f89412eddf38997e9d726a29e4a48f5d3e8bdf0		 ole-package OOXML xl/embeddings/T3n.uVXPYi Ole10Native stream: ole10NATIVE 839207 bytes

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