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

Static analysis result for SHA-256 e76dc809e48c219b…

MALICIOUS

Office (OOXML) / .XLSX

726.9 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-08-12
MD5: bc53223c7ebaaf012b1e761bc24c0532 SHA-1: 5981a92dd45800d0051e51fa8347b02a2ee30651 SHA-256: e76dc809e48c219ba0720fa41324908622d8e8b65258666eb8169d747736612f
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The sample is an Office Open XML 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 and size discrepancy, strongly suggesting exploitation of a known vulnerability within Equation Editor to execute arbitrary code. The embedded object and its anomalous stream are the primary indicators of malicious intent.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/gEEFNw0No.iFPA 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
8cc14d0f4652fabbbe7dd013ce6c8db7245d2a3fb56db0501705a4692ae42bef		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/gEEFNw0No.iFPA 1069568 bytes
ooxml_oleobject_00_ole10native_00.bin
536791ca79a29cd8d237d791794cef3493f582be0bfa4e0904159f81a186a944		 ole-package OOXML xl/embeddings/gEEFNw0No.iFPA Ole10Native stream: oLe10natIVE 1058669 bytes

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