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

Static analysis result for SHA-256 4601921f29d8465a…

MALICIOUS

Office (OOXML) / .XLSX

733.6 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-10-26
MD5: aede1aed5db8f05c6919d19c449d4b28 SHA-1: 3ec39f1bd0f325ee087ea9663305e8ff8de13ce6 SHA-256: 4601921f29d8465ae877e83bcffdf57c3a2d0353bf6824cca719d992729dbbee
100 Risk Score

Malware Insights

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

The sample is an OOXML file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and size difference, strongly suggesting exploitation of a known vulnerability within Equation Editor to execute arbitrary code. The embedded OLE object and its anomalous stream are the primary indicators of malicious intent.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/8pMqND0j.pz 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
88aa4bcd40b38f6284c4b4c36ccc33bfe1b56a4d4caf18872645bbd5b3c1378d		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/8pMqND0j.pz 1021440 bytes
ooxml_oleobject_00_ole10native_00.bin
4bf3d0ca424531c67f0df0178a32ebf3bdf53a44e45212478e58ff8abf0ac3ce		 ole-package OOXML xl/embeddings/8pMqND0j.pz Ole10Native stream: OLE10NaTive 1010943 bytes

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