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

Static analysis result for SHA-256 3c4414343f8d4061…

MALICIOUS

Office (OOXML) / .XLSX

651.3 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-10
MD5: 21942e137c56a960e61fbe2d8549bb50 SHA-1: a66d8afa9b5d3011ab9c0b2c28cf60965ea9b5eb SHA-256: 3c4414343f8d40618a3d0b27c215ed257d92fad6e015d0baf65e71cfadc635ac
100 Risk Score

Malware Insights

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

The XLSX file contains 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, suggesting it's designed to exploit a vulnerability. The presence of this anomalous object strongly points towards a malicious document intended to deliver a secondary exploit or payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/ydd4EF.UeD 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
9f78691d797431e05db1e3a6b0c208e805ded789225986a3de47e54e9cc6fe1f		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/ydd4EF.UeD 958464 bytes
ooxml_oleobject_00_ole10native_00.bin
4936c51b69adbb2cdf6eb68d59da7d28e826b598aaa9779b363cef27348ea429		 ole-package OOXML xl/embeddings/ydd4EF.UeD Ole10Native stream: OLe10NativE 948394 bytes

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