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

Static analysis result for SHA-256 649625fdaad3f351…

MALICIOUS

Office (OOXML) / .XLSX

2.93 MB Created: 2025-09-10 01:57:00 UTC Authoring application: Microsoft Excel 15.0300
MD5: 383fb71599352481664a8b0d1d1645cb SHA-1: e2650b92ba4842baf06d6ec40ea6dc35c735ab0f SHA-256: 649625fdaad3f351124af31d33d61992986024524460cb47ec90535bfaf0efd1
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is an Office Open XML spreadsheet containing an embedded OLE object, specifically identified as a Microsoft Equation Editor exploit. The high-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream, suggesting it's designed to execute arbitrary code upon interaction. This points to exploitation for client execution.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/ANNwBc5o.6Bz7 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
2f4052fb18de4b56af70ebdf3b673e3333202dc85701f6cca9c65a1ea3f21a3e		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/ANNwBc5o.6Bz7 2994176 bytes
ooxml_oleobject_00_ole10native_00.bin
6d7805bdb591812d3612b444cd2faf16ee03e04c94636c51ddb6f54c1e460af1		 ole-package OOXML xl/embeddings/ANNwBc5o.6Bz7 Ole10Native stream: Ole10naTIvE 2968404 bytes

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