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

Static analysis result for SHA-256 ba655171035f778f…

MALICIOUS

Office (OOXML) / .XLSX

720.7 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-09
MD5: cbcf38e1ccc4908b79becee26ae2bb85 SHA-1: 496e342090f85295b970b3d8c8d26a9bd2e50033 SHA-256: ba655171035f778f27bba28326bbf8500e4551a5262efb68fadcbfadc429ba89
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The sample is an Excel file containing an embedded OLE object identified as an Equation Editor. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size and header, strongly suggesting exploitation of a vulnerability within the Equation Editor to execute arbitrary code. The embedded OLE 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/y0leRy2V.G6k 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
5a3bfa5c0ed9cb044c6ca044f7b95298392e8fa1ba8ac1db9a16a80902c0a7d8		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/y0leRy2V.G6k 1030656 bytes
ooxml_oleobject_00_ole10native_00.bin
0ca89d304f4ca8836e48883e3ca9b3a1fe8ca28bc8aa7abfe4b05f03113fc387		 ole-package OOXML xl/embeddings/y0leRy2V.G6k Ole10Native stream: OlE10NaTIVe 1020253 bytes

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