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

Static analysis result for SHA-256 0a31228461b354af…

MALICIOUS

Office (OOXML) / .XLSX

641.1 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-10
MD5: ddaa192b24349c028bb0426b040488c8 SHA-1: 1ed6bc9d98dc5556a6cbcc15752188cfb998fc89 SHA-256: 0a31228461b354af6791bfc3cbf42a0c23892d7a8d56892536e88c7d36fede2e
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The sample is an Excel file containing 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 size, strongly suggesting exploitation of a known vulnerability within Equation Editor for initial execution. The embedded object itself is the primary indicator of compromise.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/UX9h.H319mLy 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
7079c2341f914b663d08ba40888c3435f312596e659b56a7c7a3b48745204099		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/UX9h.H319mLy 891904 bytes
ooxml_oleobject_00_ole10native_00.bin
72dd52b2358a0e91e4e837917cac5d37efb0e3d78e9cc6602c27de2aef978f7a		 ole-package OOXML xl/embeddings/UX9h.H319mLy Ole10Native stream: olE10NAtiVE 882232 bytes

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