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

Static analysis result for SHA-256 44cfa8be9e0260b2…

MALICIOUS

Office (OOXML) / .XLSX

657.8 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-02
MD5: 75b7811a49d646d1f24d21dd5463ad7e SHA-1: 45edf08e19b2de5c14726f5bcb73ae79119b991e SHA-256: 44cfa8be9e0260b2c8aa3d47b466462badd040a773e223d2d8fc9f4d1c9a5518
100 Risk Score

Malware Insights

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

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, suggesting it's designed to exploit a vulnerability. The document body appears to be a fabricated invoice or order form, likely a lure to encourage the user to interact with the malicious embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/sN.I9hQ8cj 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
b58a65a759d61003e7259ab3221d9bfe34321553ba62123e3473f7508b22e030		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/sN.I9hQ8cj 907776 bytes
ooxml_oleobject_00_ole10native_00.bin
0f05472e3f43077c7c0da8d4f7222570b1410deeb7501d685eeffa15037cf200		 ole-package OOXML xl/embeddings/sN.I9hQ8cj Ole10Native stream: OLE10natIve 898208 bytes

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