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

Static analysis result for SHA-256 7649bc087bdc600d…

MALICIOUS

Office (OOXML) / .XLSX

597.3 KB Created: 2023-09-27 08:05:40 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-13
MD5: a1fa479571db8f9ca06734676a829798 SHA-1: 414fd1f470e2e8dca4762167df08b82759771581 SHA-256: 7649bc087bdc600da54264992449bc0f5fe98763f88de12cc573d7676b3b9907
100 Risk Score

Malware Insights

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

The sample is an OOXML document 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 a significantly larger declared inner size than the actual stream size, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. The presence of this object indicates the document is designed to exploit this vulnerability to execute a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/I3HBA.r315wQ 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
b345c6f72d5abe4349fba1527fde26993cc7805e53b488774e9b29378ff21779		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/I3HBA.r315wQ 839168 bytes
ooxml_oleobject_00_ole10native_00.bin
5e5c60bac5331ab6c5c7108899215972b374bc0459a3696b48128f0ab7217bad		 ole-package OOXML xl/embeddings/I3HBA.r315wQ Ole10Native stream: oLE10nAtiVE 830367 bytes

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