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

Static analysis result for SHA-256 11a5d3add8641035…

MALICIOUS

Office (OOXML) / .XLSX

829.8 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: 8ab8d813d3ca68c8effdb8abbf4a4f86 SHA-1: f26fa096a70eec2a9900e363f63a1e6cafe5e8d4 SHA-256: 11a5d3add86410357163004a54f22335583b895a390e7eaf567e423ac7ccfeff
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this object carries a payload-like Ole10Native stream with an anomalous header, strongly suggesting exploitation of a known vulnerability in the Equation Editor. This technique is commonly used to achieve arbitrary code execution.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/RW10U.wMO 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
c92dbd23c228092d1c3dd4867a83374f782f1ad989aee4584e34c6078b795e28		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/RW10U.wMO 989184 bytes
ooxml_oleobject_00_ole10native_00.bin
a1756eaea9a791e1a511a904fa0f5b1d2e2c63423644b4aacc0a6d6f5a544c25		 ole-package OOXML xl/embeddings/RW10U.wMO Ole10Native stream: oLE10NaTiVE 978711 bytes

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