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

Static analysis result for SHA-256 fc2bdb118068cfdd…

MALICIOUS

Office (OOXML) / .XLSX

694.9 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-01
MD5: 9397f64eeace43eb2554036ba41657a1 SHA-1: de2b2932329438b3c48cfa0a5611477cc34ecc56 SHA-256: fc2bdb118068cfdd4ca52b23bb40d53c596383ca3c182eb4a66c10f95722562a
100 Risk Score

Malware Insights

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

The sample is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's being used to exploit a vulnerability. The embedded OLE object itself is likely the mechanism for delivering a secondary malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/A0mQq2.3c0H6r 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
809a3f147caba5ce0a91be029bfcb04df6f12d206da0da7578786801ebb4426e		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/A0mQq2.3c0H6r 941056 bytes
ooxml_oleobject_00_ole10native_00.bin
2d3bc94625acbd75a2354010cd852a51c0d68fb43c612525cb6397cd0e55993f		 ole-package OOXML xl/embeddings/A0mQq2.3c0H6r Ole10Native stream: olE10NAtIVe 931141 bytes

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