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

Static analysis result for SHA-256 5e8163b049809af8…

MALICIOUS

Office (OOXML) / .XLSX

690.8 KB Created: 2022-08-10 18:51:50 UTC Authoring application: Microsoft Excel 16.0300
MD5: 704210271187f78f5efca743bca1f0ac SHA-1: 3382dc5ba17245d5831574173b02952a53777bb1 SHA-256: 5e8163b049809af8c6fd3c6394475d842b057f8b23a03d358a7b673d0eac99c6
100 Risk Score

Malware Insights

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

The file is an Excel spreadsheet 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, suggesting it is being used to exploit a vulnerability (likely CVE-2017-11882) for client execution. The document body appears to be a fabricated purchase order, a common lure for phishing attacks.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/PbiUC.ES2FgGM 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
66741f1a9daab078c4ce4b2887891800a3404437dab963fcea28872c44569675		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/PbiUC.ES2FgGM 1007104 bytes
ooxml_oleobject_00_ole10native_00.bin
a4f1093b2e882aaa4df89cbf83326a8dd7f802477a308447cbea48254c83148f		 ole-package OOXML xl/embeddings/PbiUC.ES2FgGM Ole10Native stream: oLE10nAtIve 996551 bytes

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