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

Static analysis result for SHA-256 e40aa4094cbcd06a…

MALICIOUS

Office (OOXML) / .XLSX

588.1 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-17
MD5: 95d87acf0dc8c80c0a82055049e96f95 SHA-1: 460ab85ce1b86bf7cff8fe9ccf72b969a13bc330 SHA-256: e40aa4094cbcd06aa6573debc6afd7ae3aedd835b46e24e8c6e7540c7100bdc5
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1559 Component Object Model Hijacking

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 known vulnerability like CVE-2017-11882. This technique is commonly used to download and execute a second-stage payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/XBt.uqi2VLj 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
3571873403f101ea9cfca8468384a97e4ab0f69f6b21c1d6fdc739a895f7a32d		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/XBt.uqi2VLj 821248 bytes
ooxml_oleobject_00_ole10native_00.bin
e71ff42e033fed911f45420d3ae6ddd47b5b8626049392c6eac75ef1ce3586e0		 ole-package OOXML xl/embeddings/XBt.uqi2VLj Ole10Native stream: ole10nAtive 812519 bytes

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