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

Static analysis result for SHA-256 5a8e9c483c93c217…

MALICIOUS

Office (OOXML) / .XLSX

625.5 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300
MD5: d986e7ee7931b5413f735264e428d953 SHA-1: c0c98e768b8b401167919522d7145dc7dbe93a86 SHA-256: 5a8e9c483c93c217c67be8a908f1212734fb0664874a131ae151ecf2726c4adb
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 Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it is being used to execute arbitrary code. This is a known technique for delivering malware via Office documents.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Lgu9e.FhaG 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
1946473abd0863252fbc9d86e5f3ccfafb5837b09eaba548e97522b71c12aac3		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Lgu9e.FhaG 902656 bytes
ooxml_oleobject_00_ole10native_00.bin
64026d4a0aa1e3d2bc718c0662efcb3cde40165179e9f44b7dd4fd7328870b97		 ole-package OOXML xl/embeddings/Lgu9e.FhaG Ole10Native stream: OLE10nATIVE 893211 bytes

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