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

Static analysis result for SHA-256 87eafed523599297…

MALICIOUS

Office (OOXML) / .XLSX

750.0 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-02-23
MD5: 9471268066c94dd2b1c6b175078fc152 SHA-1: cab6967ef853d5bdd192686f4861a5d60b6d7330 SHA-256: 87eafed52359929755acdc011856239ba2ae55e88f76ba1b7d0bbbdc5c6b156f
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, identified as an Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream, suggesting it is designed to execute malicious code. The embedded OLE object is the primary mechanism for delivering the attack.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/OLx.5dHNBvx 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
f6f1a1cbd04eb2c54c2d5a7539c46610d6dacbce27180804158f4cb95cec1b6a		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/OLx.5dHNBvx 1067008 bytes
ooxml_oleobject_00_ole10native_00.bin
6d1f1a66540b2a5401691d353533913c3cca1b26a94edbb174445792c57decc1		 ole-package OOXML xl/embeddings/OLx.5dHNBvx Ole10Native stream: OlE10natIVE 1056057 bytes

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