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

Static analysis result for SHA-256 8d81fbd869cd8aba…

MALICIOUS

Office (OOXML) / .XLSX

650.4 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-06
MD5: 318b04979ed7cd23feaab1b7995e1050 SHA-1: 117df30da2d124dc43a86bf5d1a729dd74f56b9b SHA-256: 8d81fbd869cd8abac34d01411c6eb2be39ce2a1ee426969fad8a7b8baba0b83c
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. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream, suggesting it's designed to exploit a vulnerability. The embedded OLE object is the primary indicator of malicious intent, likely serving as a dropper for a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/uvbsof.GEzqP 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
b38ffb18d19f8ca4ed8542c8ec685ecf2d6b28108569550292a5f1fdc75d5d0d		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/uvbsof.GEzqP 878592 bytes
ooxml_oleobject_00_ole10native_00.bin
703b82101c446676489e56ada02b1af1c52ec3bcb88fba41337e7a5a840d74e1		 ole-package OOXML xl/embeddings/uvbsof.GEzqP Ole10Native stream: oLE10naTiVe 869002 bytes

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