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

Static analysis result for SHA-256 2770c3ae7ffedfa3…

MALICIOUS

Office (OOXML) / .XLSX

744.6 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-17
MD5: fbd3e37315d7d53d7f61b806a812581a SHA-1: e0700b438ceaae287051a8b1a4caec95f9a3f5dd SHA-256: 2770c3ae7ffedfa346585f41965d1b68fb8812cc636118b4fa392e5a2f5f0634
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The sample is an Excel file containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's designed to exploit a vulnerability. This points to a likely attack pattern involving the exploitation of the Equation Editor to deliver a malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Y4JaU.N7qk4WV 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
0c2f4925f2098321f7ca40afc91ecfe6f1045df06191a95ed1da53d91f1f66cf		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Y4JaU.N7qk4WV 1052160 bytes
ooxml_oleobject_00_ole10native_00.bin
0dee520ba5c84922cf95967475997fe74bce5c4d588f6b22a178967f59ac640a		 ole-package OOXML xl/embeddings/Y4JaU.N7qk4WV Ole10Native stream: Ole10nATIve 1041389 bytes

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