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

Static analysis result for SHA-256 9527121ac8763226…

MALICIOUS

Office (OOXML) / .XLSX

588.1 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-08-20
MD5: 10816c229a414eba4e76c9f3de35c077 SHA-1: 9f2e69d17ebbda8c162948335ee5974566550e2e SHA-256: 9527121ac87632264f2429a7f700951047e3947b69a6aaf2bbcf40629de4d603
100 Risk Score

Malware Insights

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

The XLSX file contains 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 and entropy, strongly suggesting it's used for exploitation. This pattern is commonly associated with delivering second-stage malware.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/VQ1sG.CM3itT 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
2692815bdf1b48c7798969e6e09eb8ce1fad898991a4be9b89a7d3f41e0dca57		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/VQ1sG.CM3itT 828928 bytes
ooxml_oleobject_00_ole10native_00.bin
9b5e331deb54aa05efb0d5ec5c6468dd1f7bee489f9d1546cd73c063ef9def58		 ole-package OOXML xl/embeddings/VQ1sG.CM3itT Ole10Native stream: Ole10natIVE 820069 bytes

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