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

Static analysis result for SHA-256 934f9fe9782600e0…

MALICIOUS

Office (OOXML) / .XLSX

640.6 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-20
MD5: b6f1d77b179e7dcc3740a9cc50b83c4c SHA-1: a7abc06b52f573e12708a9bb107bad741a547405 SHA-256: 934f9fe9782600e06414afde9d0c2131813fd86623010063b05272ca160b3938
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 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 presence of this anomalous object strongly indicates an attempt to execute arbitrary code upon opening the document.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/GDPK0.MK 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
1aefeeddcae35e455e524f21376805925dfe126c059f4c10b8c9c6903b037db1		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/GDPK0.MK 893952 bytes
ooxml_oleobject_00_ole10native_00.bin
de99111c300d99c8a01b3298234c274514d21b1f7fcd0f40bac07029c6b9cf32		 ole-package OOXML xl/embeddings/GDPK0.MK Ole10Native stream: OlE10NaTIVe 884696 bytes

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