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

Static analysis result for SHA-256 c7bf27480e0e699b…

MALICIOUS

Office (OOXML) / .XLSX

954.2 KB Created: 2021-09-22 12:07:42 UTC Authoring application: Microsoft Excel 12.0000
MD5: d7239315f0105b882a3e1c7540fb7dfc SHA-1: 309eb4976ebb26b8ca30d8287926582f1b2c2078 SHA-256: c7bf27480e0e699b6ecbfc4c551fac7b314458d7cbe6e193d13fe17befd40aaf
140 Risk Score

Malware Insights

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

The sample is an Office Open XML (XLSX) file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this object is anomalous and carries a payload, strongly suggesting exploitation of CVE-2018-0798. This vulnerability allows for arbitrary code execution when the Equation Editor is loaded, leading to the delivery of a malicious payload. The embedded object's filename is also listed as an IOC.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/jqxv2q.S1P 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
1583a3bad39c5df79bb3e56c9528dc26148882bb9daa38496375cc870723f734		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/jqxv2q.S1P 1256448 bytes
ooxml_oleobject_00_ole10native_00.bin
0bbbb59ffbfe2633cbefde3176af1d7a7e00ce8c50d6879e836287c3f4c458b6		 ole-package OOXML xl/embeddings/jqxv2q.S1P Ole10Native stream: oLe10NATIvE 1243900 bytes

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