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

Static analysis result for SHA-256 40dd9ae37b95be98…

MALICIOUS

Office (OOXML) / .XLSX

760.5 KB Created: 2023-06-30 16:55:44 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-08-01
MD5: 78da3c273350e50145ed0c02cdccfe79 SHA-1: 7bd629f6a77a9ff40a85dbf9fd7f8a44f3ae8cdc SHA-256: 40dd9ae37b95be98534af43904353406debd8f9a95557279b0be3a9cb73dc4ed
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 size and entropy, strongly suggesting it is used to deliver a malicious payload. The document body appears to be financial data, likely a lure.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/OqQlhYh.3dG9OM5 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
f99a90a51bf9be86d6bc3237fdd2d23a64152a67e702867c551932c37369aea0		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/OqQlhYh.3dG9OM5 1059328 bytes
ooxml_oleobject_00_ole10native_00.bin
c0f0f1641d2b66024b89bfd700c68e854df8ffb02573aab66462635a81e38f4c		 ole-package OOXML xl/embeddings/OqQlhYh.3dG9OM5 Ole10Native stream: OLE10NATIVe 1048067 bytes

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