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

Static analysis result for SHA-256 e140b41fde8f778b…

MALICIOUS

Office (OOXML) / .XLSX

601.7 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-10-10
MD5: 0990ac3995e006b5ea8981447f7c17a4 SHA-1: ea8233751979341af1b21ef42fcaee8419a6a0fa SHA-256: e140b41fde8f778b86b8be9ef8c802a9ed2cfdb5dde0be4fd220d6ddf3f8cbbb
100 Risk Score

Malware Insights

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

The file is an Excel document containing an embedded OLE object, specifically identified as a Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous declared size, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. The embedded OLE object is the primary indicator of malicious intent, likely serving as a dropper for a secondary stage.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/s9Cj.bgvD 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
f4f167f9996df1158e3181447700cd19f228e0984278dc46416d3dfa9fa56ef2		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/s9Cj.bgvD 850432 bytes
ooxml_oleobject_00_ole10native_00.bin
31ec8ecdf450f45f51901e532cb94a184cb1640921eff68befa721c017158d0c		 ole-package OOXML xl/embeddings/s9Cj.bgvD Ole10Native stream: Ole10NATIvE 841540 bytes

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