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

Static analysis result for SHA-256 1999a8f96e7f4d2d…

MALICIOUS

Office (OOXML) / .XLSX

699.8 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-17
MD5: b205c3f05a7ce90e527dc1010767dc8e SHA-1: 7a0d687e2a5fc03f16f31236961355b48a9b8363 SHA-256: 1999a8f96e7f4d2d279df50a111421805d971e615e8ccf4d3bd8220e93f49891
100 Risk Score

Malware Insights

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

The file is an OOXML document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting exploitation of a vulnerability like CVE-2017-11882. The document body presents itself as an invoice, likely a lure to trick the user into opening the malicious embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/S02HEK.y1c 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
2975f082f4184cf394323a8d30e8690b4c8c7dd5f3e1d5a4a8d80280997f7345		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/S02HEK.y1c 1019904 bytes
ooxml_oleobject_00_ole10native_00.bin
b69657be4316b17bf2433a1ed61a25a25bcb181ee0bea57b6d69e61d69f3d757		 ole-package OOXML xl/embeddings/S02HEK.y1c Ole10Native stream: OLE10NATIvE 1009196 bytes

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