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

Static analysis result for SHA-256 d2f514249c1e9f34…

MALICIOUS

Office (OOXML) / .XLSX

804.9 KB Created: 2023-01-19 05:24:18 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-04-06
MD5: 70712504966f927af2ffaaed2ab4c96a SHA-1: 906dd0046910b240df3192c6959835264774ac55 SHA-256: d2f514249c1e9f3408bd79d171525675243b3a89c0831b7c771960724c1f8546
140 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model and Distributed Component Object Model

The file is an Excel spreadsheet containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate this object exploits CVE-2018-0798 due to anomalous native stream data. This suggests the Equation Editor is used as a vector to deliver a secondary payload, likely leveraging the 'Component Object Model Hijacking' technique.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/bo0jdsj5.8N6R6V 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
b6c8796bb1457496befefd44a5643086d09e6246f775594b7455b8460c21e372		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/bo0jdsj5.8N6R6V 1065984 bytes
ooxml_oleobject_00_ole10native_00.bin
396aacb436473bc1181dca2e1887955498d8b307ed31262709be19c9b100cc5e		 ole-package OOXML xl/embeddings/bo0jdsj5.8N6R6V Ole10Native stream: oLe10NaTIVE 1055117 bytes

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