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

Static analysis result for SHA-256 0f4c6b472b4e2f57…

MALICIOUS

Office (OOXML) / .XLSX

1.96 MB Created: 2023-11-17 18:26:59 UTC Authoring application: Microsoft Excel 12.0000
MD5: cff95259c9d3b84aac33e95b00024d2e SHA-1: 6953e741e99c26309df708690299ed7376ef0fd2 SHA-256: 0f4c6b472b4e2f57fcf8236eb29b0bf3c842ec60b86b5ee4d6fe35ef6c0d2968
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is an Excel spreadsheet containing an embedded OLE object, specifically identified as a Microsoft Equation Editor exploit. This exploit is known to be used for delivering malicious payloads. The document body, while appearing to be financial data, is likely a lure. The high-entropy Ole10Native stream within the Equation Editor object strongly suggests it contains a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/2sJo.cHX 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
f6208f4afe8f07698ee1bd567922d2e49ac835a4e9247f397ad76df37318a6fa		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/2sJo.cHX 2736128 bytes
ooxml_oleobject_00_ole10native_00.bin
417a8de9e823541b3c1696916f58f61a18c4d5918471f49b4f8e221188d49fb4		 ole-package OOXML xl/embeddings/2sJo.cHX Ole10Native stream: Ole10naTivE 2712244 bytes

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