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

Static analysis result for SHA-256 32b2815cdaadfdd4…

MALICIOUS

Office (OOXML) / .XLSX

617.1 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-03-03
MD5: 4a21c3f899f33ef1df71f802f04ee602 SHA-1: 459df0acbb9b0a35306773063e2bcd31ce37a24b SHA-256: 32b2815cdaadfdd47448673d44b03d480939162234234bf09e74aa8ab936755c
100 Risk Score

Malware Insights

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

The file contains a high-severity heuristic indicating an embedded Equation Editor OLE object with an anomalous Ole10Native stream. This strongly suggests the exploitation of a known vulnerability within the Equation Editor component to execute arbitrary code. The anomalous stream size and entropy further support the presence of a malicious payload. The document body, while appearing to be a purchase order, does not directly contribute to the attack vector but may serve as a lure.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/DxwqJ.G68H 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
759977359fa731282dd42578c111a1f6b19865062b415360289e84481dd41486		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/DxwqJ.G68H 860672 bytes
ooxml_oleobject_00_ole10native_00.bin
425581d889d07271e3754beafab79513ab9889e92fbfbe867311691c3ac16b55		 ole-package OOXML xl/embeddings/DxwqJ.G68H Ole10Native stream: oLE10nATIve 851145 bytes

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