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

Static analysis result for SHA-256 8ed7befccff98a6a…

MALICIOUS

Office (OOXML) / .XLSX

756.0 KB Created: 2023-01-19 05:24:18 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-03-13
MD5: 1665862e0e23e177dcc8c0861329e1ff SHA-1: 2fecdf677e167ce13d2bf894b3a18b0b11e93698 SHA-256: 8ed7befccff98a6acb255f63071a6e6ac1410c1d3b08ce560cac3cfe24572c8e
140 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model Hijacking

The sample is an Excel file containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. Heuristics indicate anomalies in the Equation Editor's native stream, consistent with exploitation of CVE-2018-0798. This suggests the file is designed to exploit this vulnerability to execute a secondary payload.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/j5OHMLSv.QFfzfSV 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
c802029ca41f75cdc77fe0505f1429843877ee44aa912821331fb7c8d6a3b73f		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/j5OHMLSv.QFfzfSV 1047040 bytes
ooxml_oleobject_00_ole10native_00.bin
7babaddc7da7fbf5a8211da00973cb4fea76c9855f9645f8652d19d1ffe4c216		 ole-package OOXML xl/embeddings/j5OHMLSv.QFfzfSV Ole10Native stream: oLE10nATiVe 1036413 bytes

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