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

Static analysis result for SHA-256 de61fa24535c677a…

MALICIOUS

Office (OOXML) / .XLSX

718.7 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-02-01
MD5: a083335ca799d11b4e9dd8237fe2ad6f SHA-1: c3b2b2a38ae95f7f3034d2b9c17550e6d4491125 SHA-256: de61fa24535c677a8946f41e636df832ee0b97327d1c3d7ece42192c05360eff
100 Risk Score

Malware Insights

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

The sample is an Excel file 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 being used to deliver malicious content. The large declared inner size compared to the stream size further points to an exploit attempting to leverage this object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/pedLRqHzu.7WN7i 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
0465db53c51759d3d57157e6da7820c8e58c959029eb8025b1f9c0b5f0eab427		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/pedLRqHzu.7WN7i 956416 bytes
ooxml_oleobject_00_ole10native_00.bin
218b531ac457c5cc845b565dc00eec9bfaba83700a9a59083013c91d119bee7b		 ole-package OOXML xl/embeddings/pedLRqHzu.7WN7i Ole10Native stream: OLe10natIVE 946318 bytes

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