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

Static analysis result for SHA-256 eaa8d605e009671a…

MALICIOUS

Office (OOXML) / .XLSX

586.1 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-15
MD5: 0a16a231ef534ebd30286ee35fcc4c05 SHA-1: df0e98d046046d60b8038f45e12ca9fca25d595d SHA-256: eaa8d605e009671ac9b05efb064de9b85ff6350c6ea23d08ab4421cf5e8e0293
100 Risk Score

Malware Insights

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

The file is an Excel spreadsheet containing 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 header, suggesting it's being used to deliver a secondary exploit or payload. The anomaly in the declared inner size versus the actual stream size further supports this.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/MAyVtwazk.bS26v3q 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
cb403a55eb424413bbf2a3304f2a284e2c0beab6a962ce394b219e8a923ba4e8		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/MAyVtwazk.bS26v3q 793088 bytes
ooxml_oleobject_00_ole10native_00.bin
869e12ee6d12338ea3e3a19adad6068f1a18d4505efb9533f812b86adb86558c		 ole-package OOXML xl/embeddings/MAyVtwazk.bS26v3q Ole10Native stream: ole10naTiVe 784193 bytes

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