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

Static analysis result for SHA-256 1269a5ede3799ff8…

MALICIOUS

Office (OOXML) / .XLSX

609.6 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-12
MD5: ebe3f0294c87ec17b0063437ddbe37bd SHA-1: dc0a814dbc7a9922267fb19c7268ab12eda3df53 SHA-256: 1269a5ede3799ff878b5db7cfe3eabceab65e1d1877b443349c05f5702191754
100 Risk Score

Malware Insights

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

The sample is an Excel spreadsheet containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. 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. The presence of this anomalous object strongly indicates the document is a malicious lure 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/GbbEKK.JOX 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
7d813266d3b08052d2441ab5368dcfd3f4cd8e80be1555b2f08934057459ed8c		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/GbbEKK.JOX 869376 bytes
ooxml_oleobject_00_ole10native_00.bin
3b8c36d69b8f80eeb476df424ddd27a1e176361a877b86a475746da5c2c08ddf		 ole-package OOXML xl/embeddings/GbbEKK.JOX Ole10Native stream: OlE10NAtIve 859829 bytes

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