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

Static analysis result for SHA-256 023bc8ee3b41aad2…

MALICIOUS

Office (OOXML) / .XLSX

605.0 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2024-05-30
MD5: 99c7083e5407b03735e32aec10e8e877 SHA-1: d9d061309191bfe3cde5eb0ba35d9125190f260f SHA-256: 023bc8ee3b41aad262a15eedeae83f46694436aec4f0a052e53a4ace25844910
100 Risk Score

Malware Insights

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

The file is an OOXML document containing an embedded OLE object, specifically identified as an 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 designed to exploit a vulnerability. The embedded object's size and the anomaly in its header strongly indicate it's intended to deliver a secondary malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/R42n4EkR2.fz 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
a92afb11f7ef403a3f6efd75f7a1ffe88ec7473eb27a8d0e656e8e356c707346		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/R42n4EkR2.fz 885248 bytes
ooxml_oleobject_00_ole10native_00.bin
3efcb4030985ade7b4f403d485a38f304811c933a21b35db2f44c0ab428f8d7f		 ole-package OOXML xl/embeddings/R42n4EkR2.fz Ole10Native stream: oLE10NATIVe 875867 bytes

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