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

Static analysis result for SHA-256 d1b2b463e38d16bd…

MALICIOUS

Office (OOXML) / .XLSX

653.3 KB Created: 2023-08-16 07:11:49 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-17
MD5: 254a657208fd132977b57396d9f54747 SHA-1: c77e50cebf457637c10eaf7250e12f0521da85dc SHA-256: d1b2b463e38d16bdbc69afccf72233ec613e44e14b5a6cf54b191a9200468f9c
100 Risk Score

Malware Insights

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

The sample is an Office Open XML (XLSX) file 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 and a declared inner size significantly larger than the stream size. This strongly suggests the exploitation of a vulnerability within the Equation Editor component to execute arbitrary code, likely leading to the download and execution of a secondary malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/C6bS0OrSr.UyLFHr 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
23de1c4c679e7f78fd4090872f005ffdea457dde90c3a5a135854feb359f0a3d		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/C6bS0OrSr.UyLFHr 936448 bytes
ooxml_oleobject_00_ole10native_00.bin
b76270abf6afae85a763afd2fa80d19c085288d8afd7e468f75491f53ce938fe		 ole-package OOXML xl/embeddings/C6bS0OrSr.UyLFHr Ole10Native stream: OLe10NaTivE 926375 bytes

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