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

Static analysis result for SHA-256 5f8a216977f32e83…

MALICIOUS

Office (OOXML) / .XLSX

666.6 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-09-23
MD5: cc536649c35cbacd90ce41c3682873ba SHA-1: 0162bf44fd8db5630c0b6d16240fd19afe58238a SHA-256: 5f8a216977f32e8318fdfc7df749dd117fa567ed3c24326d52fa71d9bc5254b9
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample is an Office Open XML spreadsheet 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 size and header, strongly suggesting exploitation of a known vulnerability (e.g., CVE-2017-11882) to execute arbitrary code. The embedded object is the primary indicator of malicious intent.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/mSE.Pyd3 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
1f217edb7ce0b90281204260790d198b786d5b957bafc6fe0b6f5430bfd2f3c4		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/mSE.Pyd3 916992 bytes
ooxml_oleobject_00_ole10native_00.bin
31ca9629306046cb09937375b4cf7b66bc84f090281f3289f3bc599fa1b3b7b2		 ole-package OOXML xl/embeddings/mSE.Pyd3 Ole10Native stream: OLe10NAtiVE 907503 bytes

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