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

Static analysis result for SHA-256 5d4b962a8061b5eb…

MALICIOUS

Office (OOXML) / .XLSX

688.3 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300
MD5: 4757992ef87aee9dc9e4c7eb754c15f6 SHA-1: ffabcc6451cef3622cb29cd01b3f25a437e7651b SHA-256: 5d4b962a8061b5eb61046d5c321ec8a68958dd8915664c03508d9fb98dc4ca01
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this object carries a payload-like Ole10Native stream with an anomalous size, strongly suggesting exploitation of a vulnerability within the Equation Editor component to achieve code execution. The embedded object's filename is also listed as a potential IOC.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/yQ2nO.fAqEwYD 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
e02f6dd36307ddd5b388b08149103683eed9635130e9dac6f9e1bd12da5534de		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/yQ2nO.fAqEwYD 999936 bytes
ooxml_oleobject_00_ole10native_00.bin
b5cc529ad80fbe900973682265665c8a2a3baa26e4a454bb9fa7aa5316e6eae1		 ole-package OOXML xl/embeddings/yQ2nO.fAqEwYD Ole10Native stream: oLe10nAtivE 989583 bytes

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