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

Static analysis result for SHA-256 7483b56f2d22d783…

MALICIOUS

Office (OOXML) / .XLSX

695.0 KB Created: 2021-09-22 12:07:42 UTC Authoring application: Microsoft Excel 12.0000
MD5: a0c7bc410c3f492afcbd2d3e5f14c4ae SHA-1: fb646db28f76269fbb6d4c5823db25031e5ef9ee SHA-256: 7483b56f2d22d783d7816e05ed9c4f2b36f909b93b1c71667dc5034684ea368d
140 Risk Score

Malware Insights

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

The sample contains an embedded Equation Editor OLE object that exhibits anomalies consistent with CVE-2018-0798. This vulnerability allows for the execution of arbitrary code, indicating the document is designed to exploit this flaw for initial execution. The presence of an embedded OLE object strongly suggests it was delivered as an attachment.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/GWFe7NYM.jW contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY
    Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
  • 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
ee6a3ad904b831dd59b778659b33cb6f2ade07719d2847176eea0675e02f3e66		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/GWFe7NYM.jW 973824 bytes
ooxml_oleobject_00_ole10native_00.bin
cf7e3e2b783faeb57fd02582dd156c5aba58cae92cf1b01a365bee0acd34d75c		 ole-package OOXML xl/embeddings/GWFe7NYM.jW Ole10Native stream: Ole10Native 963603 bytes

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