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

Static analysis result for SHA-256 0e9817915464588e…

MALICIOUS

Office (OOXML) / .XLSX

591.1 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-15
MD5: 2cce981fd59f4f18267b2d2dabfa0594 SHA-1: a3b6653d76c82cd6513d79cf3ae5a90a3078aced SHA-256: 0e9817915464588eecd0fc0bfba8e601dd887cd9dc8c9f37edfa49eebdee7ded
100 Risk Score

Malware Insights

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

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 component to execute a malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/WBLul.Gg3ue 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
f42ed295eba519525da73222117d8ad7ee004fa225d9a720143a9bf8b2946d61		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/WBLul.Gg3ue 897024 bytes
ooxml_oleobject_00_ole10native_00.bin
cbba4223e4a1fd951abe0e24bef48617557c5a1e5214a537ff81ce5f70f40164		 ole-package OOXML xl/embeddings/WBLul.Gg3ue Ole10Native stream: OLe10NAtIvE 887650 bytes

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