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

Static analysis result for SHA-256 159083afade6effd…

MALICIOUS

Office (OOXML) / .XLSX

602.5 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-25
MD5: b8636be5f5a9b54bbdf8216e3eafe9b4 SHA-1: 945ea95807ffec6d919eeb94d1a05542a505cf2c SHA-256: 159083afade6effd8e27eef8c3bd9367a26f350128ace620f31b1f90ba03a381
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 Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size difference, strongly suggesting exploitation of a vulnerability within the Equation Editor component. This is a common delivery mechanism for exploiting Equation Editor vulnerabilities to execute arbitrary code.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Q6.dbP3 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
da8dba37f875b49b3a3593f3e37ab31cd4d1a094617e58444fb316db84392b3c		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Q6.dbP3 882688 bytes
ooxml_oleobject_00_ole10native_00.bin
bb9cd68c88424ee60d916cc53002435876b131ec547fe7d25a0867911a3177e8		 ole-package OOXML xl/embeddings/Q6.dbP3 Ole10Native stream: oLE10nATiVe 872989 bytes

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