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

Static analysis result for SHA-256 84f4693d4a792a2a…

MALICIOUS

Office (OOXML) / .XLSX

650.0 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-10
MD5: 712c1e0ff2310c2eba2c88bfa9b9a767 SHA-1: 0f43eeddb95688ec8ed98160b98118f34ddc022c SHA-256: 84f4693d4a792a2abf963448708d46b0fae637c00197402763fda87574caf2a4
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model Hijacking

The file is an Excel document containing an embedded OLE object, specifically identified as an Equation Editor object. 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 embedded OLE object is the primary indicator of malicious intent, likely leading to the execution of a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/NOnOYuE.afg 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
84461c885563a1c2532910896195eb4e48517d2b67735364057a0a30f19202f5		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/NOnOYuE.afg 899072 bytes
ooxml_oleobject_00_ole10native_00.bin
60fbc7e17813262890c79553f7b7b62e74a8adec701875395072e8084e26d077		 ole-package OOXML xl/embeddings/NOnOYuE.afg Ole10Native stream: olE10nATIVe 889367 bytes

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