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

Static analysis result for SHA-256 f46cc6419b9d6460…

MALICIOUS

Office (OOXML) / .XLSX

720.9 KB Created: 2023-09-27 08:05:40 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-29
MD5: 2a39d63055d2202a45a9284cb527f785 SHA-1: 971332335fe7e42155f1dc230a76cea8feace286 SHA-256: f46cc6419b9d6460e72e301b9bb5f1e2c8ce102a7e38b18ffd3a016da82da9d1
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The file contains an embedded OLE object, specifically identified as an Equation Editor object. Analysis indicates that this object carries a payload-like Ole10Native stream with an anomalous header, suggesting it is designed to execute malicious code. The large declared inner size compared to the stream size further points to obfuscation or a packed payload within the Equation Editor object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/MC4GSzlH.AtA 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
6b3cdfb8601042732f24de52299d6b90dfd1b608a311f68f289170cabedb35cb		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/MC4GSzlH.AtA 1031168 bytes
ooxml_oleobject_00_ole10native_00.bin
127389f0be9434cf5ca4b7f5344fd6840c2462503df460e57f700521b823a691		 ole-package OOXML xl/embeddings/MC4GSzlH.AtA Ole10Native stream: OlE10NatIVE 1020897 bytes

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