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

Static analysis result for SHA-256 7702510cdfbb1758…

MALICIOUS

Office (OOXML) / .XLSX

618.8 KB Created: 2023-09-04 23:15:54 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-05
MD5: 406bf1e5cf818d73b22596bec384006b SHA-1: 3f3632ff8ea8454232fd099bf63f06471be08a46 SHA-256: 7702510cdfbb17588f4a6bf872cca1bf476d4553c8f978785139c48c3c202a1a
100 Risk Score

Malware Insights

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

The file is an OOXML document 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 difference, strongly suggesting exploitation of a known vulnerability like CVE-2017-11882. This technique is commonly used to achieve arbitrary code execution.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/iJrdi.euE 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
bf3984a7012af82853d8c84d1dbf5c72fb5311d74cb8798d8d61b7e9d9c8d181		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/iJrdi.euE 888832 bytes
ooxml_oleobject_00_ole10native_00.bin
8e99e149f8983b651b5dd911b9465bd23c001e415573785291601d4ebefff586		 ole-package OOXML xl/embeddings/iJrdi.euE Ole10Native stream: olE10NATIVe 879280 bytes

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