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

Static analysis result for SHA-256 e32abd041b0db3fb…

MALICIOUS

Office (OOXML) / .XLSX

609.7 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-15
MD5: 7ff9c9800249680b3c17a911cb25f246 SHA-1: ba4b5e230f41d26c21fb9f691908eead340777c3 SHA-256: e32abd041b0db3fbec59ff3c27d72189fab54948cb5d2b332fb9eb985cfe94e8
100 Risk Score

Malware Insights

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

The file is an Excel 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 anomaly in the stream size and header further supports this, pointing towards an attempt to execute malicious code upon opening.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/7aIIe.usv 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
32ae9a478f5f90c81e28f6796d07991106b391f05844b946a7b1eea7bc8d41a4		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/7aIIe.usv 883712 bytes
ooxml_oleobject_00_ole10native_00.bin
6129838101d465f7deb4fe08fff52009d3d493b3f04f4fb127fed9e025d0b882		 ole-package OOXML xl/embeddings/7aIIe.usv Ole10Native stream: ole10NAtiVE 874119 bytes

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