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

Static analysis result for SHA-256 25361a2a438808be…

MALICIOUS

Office (OOXML) / .XLSX

617.0 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-20
MD5: 4cb66fd5623ad8147610faf016cb7790 SHA-1: aef2a566a57268116bdc7a095d5cbb6d9d868542 SHA-256: 25361a2a438808be804d3699a25651fce2978379c8aa750281d4fc4c6eb53f52
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The file is an Excel document containing a high-confidence OLE object that appears to be an Equation Editor exploit. The OLE object's 'Ole10Native' stream has an anomalous header and a size mismatch, strongly indicating it carries a malicious payload. The document body contains what appears to be a product order or invoice, likely a lure to encourage interaction with the embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/12lsZb.ny74myY 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
82f65b47135e79bb9c5003a808bb5a8d476fc7d4381c5bf40ddd46f996c4c8e0		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/12lsZb.ny74myY 863232 bytes
ooxml_oleobject_00_ole10native_00.bin
575cfd665740d5d40d76292a3474e20d64c46ce9f4eed95eb3d8f2779318d41b		 ole-package OOXML xl/embeddings/12lsZb.ny74myY Ole10Native stream: olE10naTive 853567 bytes

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