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

Static analysis result for SHA-256 0a87a546828a66fe…

MALICIOUS

Office (OOXML) / .XLSX

2.30 MB Created: 2025-09-22 22:56:50 UTC Authoring application: Microsoft Excel 12.0000
MD5: 413a1ad1e72e292c113a5d44f8a30202 SHA-1: 067e5e2f53082a4b0ab8558f7dbc1d051a1fbdd2 SHA-256: 0a87a546828a66fecb8e2856994998754f82311e1c4db0891de1cdbba987fdb8
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is an Office document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor exploit. This exploit likely delivers a second-stage payload, indicated by the anomalous Ole10Native stream within the Equation Editor object. The document body's repetitive and nonsensical text suggests it's a lure to encourage user interaction, likely to enable macros or editing to trigger the exploit.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/1oI7.MdN 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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
94425328ef6d0a79f46202bcffad707ea373039fed98d6529a029b62136c9763		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/1oI7.MdN 2946048 bytes
ooxml_oleobject_00_ole10native_00.bin
64707efaca99d22c2c7cb88a10a66089f086a89b77e9f2b9f6f26068177bae9b		 ole-package OOXML xl/embeddings/1oI7.MdN Ole10Native stream: OlE10nAtIve 2920606 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.