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

Static analysis result for SHA-256 7be0e74632758595…

MALICIOUS

Office (OOXML) / .XLSX

651.7 KB Created: 2023-09-19 06:25:18 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-03
MD5: 711f22759352f71502ae383ab4cea435 SHA-1: 2c766048391043b624a0d9713fa664ec5f151a0e SHA-256: 7be0e7463275859563c266e5a7f0d02dd105458764ca49523d19c64811e1f0d5
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The sample is an Excel file 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 header, suggesting it is being used to exploit a vulnerability. This is a common delivery mechanism for malware.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/91a2DH.L8 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
be16b6825a7dd79ac7d9eaac6a9e08dfbc20aafc34b2e2851cf7cfb11a48be7a		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/91a2DH.L8 975872 bytes
ooxml_oleobject_00_ole10native_00.bin
7cfc5bec2688a1399df71273b41dcbd7a77eafb23bea33e65a3bc0bc66c336b6		 ole-package OOXML xl/embeddings/91a2DH.L8 Ole10Native stream: OLe10NaTIve 965822 bytes

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