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

Static analysis result for SHA-256 953e4c59be680bbd…

MALICIOUS

Office (OOXML) / .XLSX

663.5 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-02
MD5: 7405b4a27d514d4e902df7462212f764 SHA-1: 763de09016d44ee3bc961aac138af0b4e4092c83 SHA-256: 953e4c59be680bbdb2b577bf5a2f41748a1aaa5ad577a032d2b92d491d0c779f
100 Risk Score

Malware Insights

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

The file is an Office 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 with an anomalous header and a significantly larger declared inner size than the actual stream size. This strongly suggests the exploitation of a known vulnerability within the Equation Editor component to execute arbitrary code.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/dpi.4GSw2z 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
66daab6c3362a2a1ed81b3a89ef4c97e08ad9ee7bff0ee854b3bec399dd44cfd		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/dpi.4GSw2z 930304 bytes
ooxml_oleobject_00_ole10native_00.bin
4bb5c1b75a9aa7f10a862a2cd9c283b12137ce80449aa137f4be1cc589533920		 ole-package OOXML xl/embeddings/dpi.4GSw2z Ole10Native stream: OLE10NAtiVE 920505 bytes

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