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

Static analysis result for SHA-256 521e56cecd5dd355…

MALICIOUS

Office (OOXML) / .XLSX

711.4 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-07-05
MD5: e991e2f82fe86b23ae342b296a5b212d SHA-1: 65cde8d0909a4646746db6fa4675559cd73b309a SHA-256: 521e56cecd5dd355d23dcf9085f29499dc4580835a69222a13214873971e2dce
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1559 Component Object Model Hijacking T1059 Command and Scripting Interpreter

The file is an Office document containing an embedded OLE object, specifically identified as a Equation Editor object. This object carries a payload-like Ole10Native stream with an anomalous size, strongly indicating exploitation of a vulnerability within the Equation Editor component. The embedded object is the primary mechanism for delivering the malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/RdohipV4U.nTh 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
1d71bb0bdcc7acbd72050920f023a596562292426970e94ee6149f2edce5423a		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/RdohipV4U.nTh 1025536 bytes
ooxml_oleobject_00_ole10native_00.bin
9d8a08c3bdf4aee1f10c1ec802011e8a30ba6691422498a6895459f8bb665dd3		 ole-package OOXML xl/embeddings/RdohipV4U.nTh Ole10Native stream: OLe10naTIVe 1015292 bytes

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