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

Static analysis result for SHA-256 7def9852942bf985…

MALICIOUS

Office (OOXML) / .XLSX

585.1 KB Created: 2023-10-01 23:46:04 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-10-02
MD5: 4660288abf79a9c053494c8b948bfb77 SHA-1: 0069ccd3f8afc0b84f0572e67ef1028b76d04c4f SHA-256: 7def9852942bf985cc2a06728e38549e8e1408bac8d343ddde3b3bfc119c4a07
100 Risk Score

Malware Insights

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

The file is an Excel 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 size, strongly suggesting exploitation of a vulnerability within the Equation Editor component. This is a common technique for delivering second-stage malware.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/6gVOrQSC.D05 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
da981bd0879795c91be360de46badb83dc6f50dc2b4f3516312172b49cbf70a0		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/6gVOrQSC.D05 805888 bytes
ooxml_oleobject_00_ole10native_00.bin
a353d67cfae562db631fe5a61b8019bc8e592c4017623e373e44fdc300bdf685		 ole-package OOXML xl/embeddings/6gVOrQSC.D05 Ole10Native stream: ole10nAtivE 796838 bytes

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