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

Static analysis result for SHA-256 b3dfe1cd5433b5a1…

MALICIOUS

Office (OOXML) / .XLSX

669.0 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-08
MD5: 356d1a72570052ba72ba16cbfb76ff9d SHA-1: 6c2043fd6e6392b4b8115a7b955ef8513eaee665 SHA-256: b3dfe1cd5433b5a18b178b28deffd2858e7c73df374c132beafb4dc89f5ffebf
100 Risk Score

Malware Insights

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

The file is an Office document containing an embedded OLE object, specifically identified as a Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. The embedded OLE object is the primary vector for delivering the malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/ope092VF.MrPNWCI 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
1b2546070dcc982ad486133f8587b21ae8ada2a85f6d7672d27d04185878c28b		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/ope092VF.MrPNWCI 980480 bytes
ooxml_oleobject_00_ole10native_00.bin
6e48c151dea4227b817c5194d0d9c0167a7f89b4125f37ecc843dcdd2017d24b		 ole-package OOXML xl/embeddings/ope092VF.MrPNWCI Ole10Native stream: OlE10naTiVe 970433 bytes

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