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

Static analysis result for SHA-256 638fdd4edd3ead24…

MALICIOUS

Office (OOXML) / .XLSX

596.3 KB Created: 2022-08-10 18:51:50 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-09-21
MD5: ad2dc6c96139946a2da698b9d0ae47e9 SHA-1: 42b047b716cccc6029891d256a542d9283626fd6 SHA-256: 638fdd4edd3ead24d191b5918ec5e136f794fa99977b35f6d04e80c21c1cdc8c
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1137.003 DLL Side-Loading

The file is an Excel document containing an embedded OLE object, specifically identified as an 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 deliver malicious content. The document body itself appears to be a fabricated purchase order, likely serving as a lure to encourage interaction with the embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/pLcpm6l.0qawt 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
b50fedb30dd2915a9e0b201e2addc7d50cd263ab91275e91009bf1b0bfb89467		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/pLcpm6l.0qawt 874496 bytes
ooxml_oleobject_00_ole10native_00.bin
2e9f990ad4c69d7e7dab9e461a4dd310d9253144c13c6b7193f2ffdfdf4f308d		 ole-package OOXML xl/embeddings/pLcpm6l.0qawt Ole10Native stream: oLE10NaTivE 865172 bytes

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