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

Static analysis result for SHA-256 fa167d133cb53da5…

MALICIOUS

Office (OOXML) / .XLSX

742.4 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-10-28
MD5: f7afc6233a1a8e0607449a7552748722 SHA-1: 2c448ddfddb4b1c0481698d5181b6295633e1777 SHA-256: fa167d133cb53da59f334ef6b12b264ef4e716a595084b6f922c4e447ea3def0
100 Risk Score

Malware Insights

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

The file contains 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 being used to exploit a vulnerability. The presence of this anomalous object strongly indicates an attempt to execute malicious code upon opening the document.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/uvGDs3x8.GzOpFpn 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
72e0261539624f43eb5cfbdad1b2c67120d723d90098cd39f4d574418838c6b7		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/uvGDs3x8.GzOpFpn 1067520 bytes
ooxml_oleobject_00_ole10native_00.bin
5bb3797d63bd1de96d874a38594b77eca71842105be22152adccf4a960e65b13		 ole-package OOXML xl/embeddings/uvGDs3x8.GzOpFpn Ole10Native stream: OlE10NatIvE 1056637 bytes

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