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

Static analysis result for SHA-256 43797e56e3c9377b…

MALICIOUS

Office (OOXML) / .XLSX

601.7 KB Created: 2024-03-25 10:30:17 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2024-08-02
MD5: f473cd1013fe8ac290484b578a202679 SHA-1: 1f78249ec6eabe9040341365ac5bd4c5d49b2591 SHA-256: 43797e56e3c9377b69c8816c46fb04ca23c34bd51ce455a4fe3f7474e636b1a4
100 Risk Score

Malware Insights

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

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 and size discrepancy, strongly suggesting exploitation of a vulnerability within the Equation Editor component to execute arbitrary code. The embedded object's path and stream name are noted as IOCs.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/lpRq.oCt 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
b425b3c6b92bd47c7144e8d5cef33b0e419ef214587e2118429ab04e5f36dd13		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/lpRq.oCt 854528 bytes
ooxml_oleobject_00_ole10native_00.bin
b79d32b669a9fdad3dde5c168e3a231271b1af547ab4deb2ff511a6912e35378		 ole-package OOXML xl/embeddings/lpRq.oCt Ole10Native stream: OlE10naTIVE 844839 bytes

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