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

Static analysis result for SHA-256 45e8b36efed8ce47…

MALICIOUS

Office (OOXML) / .XLSX

662.6 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-09-22
MD5: 5535f0194518eff8fe955b0727ad3327 SHA-1: 91b0ead4f290c641b3629db88473b711df0f5d32 SHA-256: 45e8b36efed8ce47b620bc498a845aaf748e29422599e774ee86757457c88e31
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is an Excel spreadsheet containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size and header, strongly suggesting exploitation of a known vulnerability (e.g., CVE-2017-11882) to execute arbitrary code. The embedded object itself is the primary indicator of compromise.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/MO.kTAQr 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
e942067ce031e97a4047827f20a4b27580cc775245449e8dd63c56cfd32c0f99		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/MO.kTAQr 923648 bytes
ooxml_oleobject_00_ole10native_00.bin
4ad94b362c1421237e00cbd8699dbaaa9c1ebe42f0fdf23e53219bc2bb1ae251		 ole-package OOXML xl/embeddings/MO.kTAQr Ole10Native stream: OLE10NAtIVe 913881 bytes

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