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

Static analysis result for SHA-256 6a4bdcfe53bdab64…

MALICIOUS

Office (OOXML) / .XLSX

678.1 KB Created: 2023-12-04 17:54:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-06-25
MD5: 104bc9e57d5c57d480f003f056573cc8 SHA-1: eb8cf0069a40aa0389ac392b477cc9b0706cbd33 SHA-256: 6a4bdcfe53bdab64b14abe7b4106a16956c56dc5d448189797b64276054af6e8
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1204.002 User Execution: Malicious File

The XLSX file contains 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 with an anomalous header, suggesting it's designed to exploit a vulnerability. This points to a likely attack pattern involving the exploitation of the Equation Editor to deliver a malicious payload upon user interaction.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/jiNV0AR.abrB4 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
9c4c53d77e42e22de11511220ea6f8f899361f279e461dfc2dbacf0847fddffa		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/jiNV0AR.abrB4 920576 bytes
ooxml_oleobject_00_ole10native_00.bin
9fd38241808fdab9bf0ee388c3e52c3dbb91b87bf1e2cb6c2e71af552a6fc00c		 ole-package OOXML xl/embeddings/jiNV0AR.abrB4 Ole10Native stream: oLe10NAtive 910422 bytes

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