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

Static analysis result for SHA-256 13cd3750e4e59210…

MALICIOUS

Office (OOXML) / .XLSX

2.76 MB Created: 2025-09-10 01:57:00 UTC Authoring application: Microsoft Excel 15.0300
MD5: 7e3c718c64eebc5ac7b6005d5b2d7657 SHA-1: 909e239e1c330ab9c390672cbe8e842d252d1383 SHA-256: 13cd3750e4e59210ce45c830b5114b23d37b97b16cdbc818237bb4b7abae28ca
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Office document 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. This points to exploitation for client execution as the primary attack vector.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/sluat.ZUh1RYo 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
56339be3b3accf40ec4a2255fa3ea492edd2231fdf72bf5d081b8607b013eaeb		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/sluat.ZUh1RYo 2782720 bytes
ooxml_oleobject_00_ole10native_00.bin
6b0e4e152deb155fdb060e3330d1293e06259663d628ef385f7b255f91c493b5		 ole-package OOXML xl/embeddings/sluat.ZUh1RYo Ole10Native stream: Ole10naTIVe 2758245 bytes

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