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

Static analysis result for SHA-256 eab1fa279c84e50e…

MALICIOUS

Office (OOXML) / .XLSX

600.1 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-11
MD5: 03b2e8ea95c6eb925217dae8a49fdbdb SHA-1: 7dcda1e2398dbcc8ec4e714bca1f1b03259d12c9 SHA-256: eab1fa279c84e50e603c4a5e59464f0e4aa0873a8b06f1ec0c507caddfebd452
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The file is an Excel spreadsheet 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, strongly suggesting exploitation of a vulnerability within the Equation Editor component. This technique is commonly used to execute arbitrary code.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/3to9Yz2K.jr 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
b2d325d997a813c6686b12b72e01bb68b82bc0467ee8a4576eb1aeaccd70f0e9		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/3to9Yz2K.jr 889344 bytes
ooxml_oleobject_00_ole10native_00.bin
5a7ceb5707c522f649ac045dafc760cfce3f7fa14dab67d7f8ddcdc393fc41fb		 ole-package OOXML xl/embeddings/3to9Yz2K.jr Ole10Native stream: oLE10NAtIve 879730 bytes

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