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

Static analysis result for SHA-256 78f85782d64fdb70…

MALICIOUS

Office (OOXML) / .XLSX

726.3 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-11
MD5: 51e71d96358843402e3b178baa54217a SHA-1: ece33694b46b6650a1855e167e9d47207040543c SHA-256: 78f85782d64fdb70e1cc27d2c1564656748ed363f0b4d7fcc523cea165209a85
100 Risk Score

Malware Insights

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

The file is an Office document 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 header, suggesting it's designed to exploit a vulnerability. The embedded OLE object and its anomalous stream are the primary indicators of malicious intent, likely leading to the execution of a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/6v4jZ.fjaFGA 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
bedbdedcb96e214618d9e331125c0ca4793cc38830248d2cd677a136d0d2bf53		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/6v4jZ.fjaFGA 1021952 bytes
ooxml_oleobject_00_ole10native_00.bin
d1dab889814cd95674a9bf8003f91c4ac6eada4b1a7e5dbedc74ed5772f63b51		 ole-package OOXML xl/embeddings/6v4jZ.fjaFGA Ole10Native stream: OlE10nATiVE 1011671 bytes

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