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

Static analysis result for SHA-256 3a5d7202d8161793…

MALICIOUS

Office (OOXML) / .XLSX

2.82 MB Created: 2025-09-10 01:57:00 UTC Authoring application: Microsoft Excel 15.0300
MD5: 255cf02d5827362abae6b3b448809d50 SHA-1: 35a39bbf1aa753630d706fa99f00477f7981c34e SHA-256: 3a5d7202d81617932cdbdb4887b281c6c6a6ca85c249652504f74244d94035aa
60 Risk Score

Malware Insights

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

The file is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. This strongly suggests exploitation of a known vulnerability within the Equation Editor component. The embedded object is likely a payload designed to execute arbitrary code upon opening the document, leading to further malicious activity.

Heuristics 2

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/7c.S3YOI contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • 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
07730aa94975aca3cd9a771714f7abce88f82f01896ce7f8895a12a39d5bae35		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/7c.S3YOI 2880000 bytes
ooxml_oleobject_00_ole10native_00.bin
1be7b0c2ef66a34359b2d01bb7f6e62a3fb9dc49d76a22fb6dbaf187f8204fe7		 ole-package OOXML xl/embeddings/7c.S3YOI Ole10Native stream: olE10naTIVe 2855300 bytes

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