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

Static analysis result for SHA-256 0804027c756e2cb6…

MALICIOUS

Office (OOXML) / .XLSX

2.82 MB Created: 2025-09-10 01:57:00 UTC Authoring application: Microsoft Excel 15.0300
MD5: 03cfe2c6ee4cda3fb0ddcaafae85a06f SHA-1: cc2c6cde0a9d0ee7e515bc1944af0a9c6f1ba39f SHA-256: 0804027c756e2cb60d60b03f2ef61bb7df4b4d4f108f08c48fa4be4e0fde6324
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is an Excel document containing an embedded OLE object, specifically identified as a Microsoft 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 known vulnerability like CVE-2017-11882 for client execution. No document body or scripts were extracted, but the presence of the malformed Equation Editor object is sufficient evidence of malicious intent.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/m2Zkn3X1g.Oj1MD 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
e93cb3deb9fc98d4a40d7b0a46d32d98b8b94b2cfe9f8aa7235317e192ca3946		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/m2Zkn3X1g.Oj1MD 2833408 bytes
ooxml_oleobject_00_ole10native_00.bin
be044640913d1bd72e7c81229cee8c0d7d6eb6a7e511396a42b6343b34222d77		 ole-package OOXML xl/embeddings/m2Zkn3X1g.Oj1MD Ole10Native stream: OlE10natiVe 2808426 bytes

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