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

Static analysis result for SHA-256 12979ce2e12a9a15…

MALICIOUS

Office (OOXML) / .XLSX

673.9 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300
MD5: a5348c9bc70698cf3eb72cad8e89bd0d SHA-1: bfcb1aa74aae2a3abad65922cb952b0748a88b79 SHA-256: 12979ce2e12a9a15a6b164999d06fd0a41f2bb018481943a855a7f1edbad2c7d
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an Excel 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, suggesting exploitation of a vulnerability within the Equation Editor to achieve arbitrary code execution. This is a common technique for delivering malicious payloads via Office documents.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/EAEQo5hY0.Zosm 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
c083617e4defb1a498c522e3b8cfbfd955ed9a5f08781753bd84294220abc0ae		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/EAEQo5hY0.Zosm 1007104 bytes
ooxml_oleobject_00_ole10native_00.bin
23256572e8844d2640c6e50fa7df0f5c120f2571f1357cea23031350aecaa5dc		 ole-package OOXML xl/embeddings/EAEQo5hY0.Zosm Ole10Native stream: ole10naTiVE 996711 bytes

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