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

Static analysis result for SHA-256 fddad294564619dd…

MALICIOUS

Office (OOXML) / .XLSX

2.90 MB Created: 2025-09-10 01:57:00 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2025-10-23
MD5: b5a63c729b6d42664aad7462685c06ae SHA-1: 8776364e034048ff06e68d16fb4812fb53263113 SHA-256: fddad294564619ddb5320365558010b2e2a4216daf82f064ed5bf596e1dc363b
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link

The sample is an OOXML file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and size discrepancy, strongly suggesting exploitation of a known vulnerability like CVE-2017-11882. This technique is commonly used to download and execute a second-stage payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/gme.xuebO 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
806782dbaa768e28f827a55c0a532509280ccc4a4638662dc8f8383640703d36		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/gme.xuebO 2953216 bytes
ooxml_oleobject_00_ole10native_00.bin
12ecf6126df89d028a447109b1bd9dac517eb9101e98647a8c7d315b0e7084af		 ole-package OOXML xl/embeddings/gme.xuebO Ole10Native stream: OLe10nATIVe 2927288 bytes

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