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

Static analysis result for SHA-256 d19474c4a853c39b…

MALICIOUS

Office (OOXML) / .XLSX

679.7 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-08-17
MD5: 215e1fc85e9e560aae4d9fcd1dee2b14 SHA-1: 0e9fa2902ca7b559285cfa9be216b8c34c96fc5d SHA-256: d19474c4a853c39b3225c597fafa4eb569c013aae2df1148aef2c425d46d850f
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The file is an OOXML 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 header, suggesting it's designed to exploit a vulnerability. This is a common delivery mechanism for exploiting client-side vulnerabilities to execute arbitrary code.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/fZL0.9YkYu 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
63697d5f5a9c27ec5c239edc0a1106b47f8f09ae7cc4194758dda31e63370c3b		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/fZL0.9YkYu 991744 bytes
ooxml_oleobject_00_ole10native_00.bin
2e8a2069a7edc2f7d6d0d80e314b22c10cb4612c402e1296b515751b4e5ef070		 ole-package OOXML xl/embeddings/fZL0.9YkYu Ole10Native stream: OlE10nATive 981224 bytes

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