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

Static analysis result for SHA-256 3a7264bdf6706db8…

MALICIOUS

Office (OOXML) / .XLSX

677.1 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-06-15
MD5: c88b8940052e265e718e82496d1c1c76 SHA-1: 471923af17c006721a6ecd702ab8541aba6b8491 SHA-256: 3a7264bdf6706db8f2e05a2979059626b90a06674461c02c01d3917a694a0521
100 Risk Score

Malware Insights

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

The file is an Excel document 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 structure, suggesting it's designed to exploit a vulnerability. The embedded OLE object is the primary mechanism for delivering the malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/ilWkyD.tgx 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
cec9eecdb52bda8f0857cf33fb851b502597a4a4d6d8686824234a846502c1fb		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/ilWkyD.tgx 976896 bytes
ooxml_oleobject_00_ole10native_00.bin
ba4160531073a771ba2933c057e315e8c9d36bbd2af157f1314608d89a0e8c25		 ole-package OOXML xl/embeddings/ilWkyD.tgx Ole10Native stream: Ole10NAtIvE 966754 bytes

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