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

Static analysis result for SHA-256 fb906bfeac0591b9…

MALICIOUS

Office (OOXML) / .XLSX

728.7 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-22
MD5: 53adcea044425d162fc340a4d2c7b868 SHA-1: e6e1ef665f3df5cfa2ad04b6400fcfd8cc5072b7 SHA-256: fb906bfeac0591b9fe15b3d1f3e27da1f8a800ed55b068a9fdc86764257d0a96
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The file is an Excel document containing an embedded Equation Editor OLE object. Heuristics indicate that this object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's designed to exploit vulnerabilities within the Equation Editor. The embedded object's path is also noted as an IOC.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/ksGkXtIgt.6Wv5 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
b58d73cacc45f68e01eaeac0e255bcde8d521e09e04a9ae9efa3a6f35cfe9cb9		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/ksGkXtIgt.6Wv5 979456 bytes
ooxml_oleobject_00_ole10native_00.bin
3637f818932a74383efb2fdb5dc08cb50fe066b141bb616a14c5dfd534334721		 ole-package OOXML xl/embeddings/ksGkXtIgt.6Wv5 Ole10Native stream: oLE10natiVE 969297 bytes

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