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

Static analysis result for SHA-256 18ee2f8b9412098f…

MALICIOUS

Office (OOXML) / .XLSX

710.3 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-12
MD5: f62c7f69017079592f3283d73e027ae5 SHA-1: 5641f0341906fcae032818b3fb7e9d9a13f20eec SHA-256: 18ee2f8b9412098f0468b3463fc9cf76c80dafe30be796b9aadd2cc44a61c423
100 Risk Score

Malware Insights

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

The sample is an Office document containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. Heuristics indicate that this object carries a payload-like Ole10Native stream with an anomalous size and entropy, strongly suggesting it's designed to exploit the Equation Editor vulnerability. The document body appears to be a commercial invoice, likely a lure to entice the user to open the malicious content.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/yory3xV7.fy 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
b87039b0b13603a477ad992f173386e4ab8f21321bd092e1cb9ea6714af933d1		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/yory3xV7.fy 977920 bytes
ooxml_oleobject_00_ole10native_00.bin
a0edbabd1eb1e97be35c2e51fed09ade0e26c9d2144ada0f00d7760b7b5a2dc6		 ole-package OOXML xl/embeddings/yory3xV7.fy Ole10Native stream: OlE10NativE 967694 bytes

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