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

Static analysis result for SHA-256 53e1588a7b348916…

MALICIOUS

Office (OOXML) / .XLSX

657.9 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-09-23
MD5: dfdf22b4dd69df6a9c5e826bb6d11057 SHA-1: 23befedb01ef02d320df91d2737754db36dee982 SHA-256: 53e1588a7b3489167db4edef61170fb19cb028e114e48b8fedd753512cea8c31
100 Risk Score

Malware Insights

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

The file is an Excel spreadsheet containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's designed to exploit a vulnerability. This points to a likely attack pattern involving the exploitation of the Equation Editor to execute a malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/1y6.pC 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
8f0b3f49d59e58358cd4eee30293e7ea1696db2f7a6af68fe0716c050ec0d8d8		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/1y6.pC 919552 bytes
ooxml_oleobject_00_ole10native_00.bin
7c81dab9ca990257eee0c4d3a7848c74ea5ec99e9a88001ccfb0088b61e6766b		 ole-package OOXML xl/embeddings/1y6.pC Ole10Native stream: OlE10nAtiVE 909403 bytes

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