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

Static analysis result for SHA-256 d74a8eaf2998510e…

MALICIOUS

Office (OOXML) / .XLSX

656.0 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-10
MD5: 5df5b2aed28c2f95652cf42c61270b1a SHA-1: c1ab58e2b5ad0454f04b93db566869ad8fc17554 SHA-256: d74a8eaf2998510ed7edd3c92fda1bfb127937706ba5fd1f932fb1d3808735e3
100 Risk Score

Malware Insights

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

The sample is an OOXML file 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, suggesting it's being used to exploit a vulnerability. The presence of this embedded malicious object is the primary indicator of compromise, likely intended to execute a secondary payload upon opening.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/luDA4mM.yB6 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
159d9e4bd8ca3991a04ff0ee9b7fb1ab668be4073cc3cf0d5f8c6b1be6c1edbc		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/luDA4mM.yB6 916992 bytes
ooxml_oleobject_00_ole10native_00.bin
2b7c788486f7c1234853ffb84d66c630932681281f36d434f2d4060e0dc850f3		 ole-package OOXML xl/embeddings/luDA4mM.yB6 Ole10Native stream: ole10NAtive 907497 bytes

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