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

Static analysis result for SHA-256 8d5726af8decf629…

MALICIOUS

Office (OOXML) / .XLSX

564.2 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: b06f39fd76ece9eaae3b3e9e84b1eac6 SHA-1: 4b20dc2bc6ece0708bd913c21e7cc436b764cc53 SHA-256: 8d5726af8decf629b89691ac057ed73e3a887eb6cb01425bc5b88c7d5a43b199
110 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The sample is an Excel file containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. Heuristics indicate exploitation of CVE-2018-0798 due to an anomalous Equation Editor native stream. This suggests the file is designed to exploit this vulnerability to execute a malicious payload. No document body text or scripts were extracted, limiting further analysis of the payload's specific actions.

Heuristics 5

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/oleObject1.bin contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY
    Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object
  • Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET
    Excel workbook contains 1 hidden sheet(s) — hidden sheets are commonly used to conceal macro code, staging data, or intermediate payload construction
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.day.com/dam/1.0
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/tiff/1.0/
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
b117da450f84705a9a64829cc3112bcf9f8af4f6f4a903fdfba7436f6cfc25f6		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes
ooxml_oleobject_00_ole10native_00.bin
10ff2e1b9b1660d1f8ac50e54688936e3eb341bf00547e37af8bf88742898bc0		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLE10natIvE 1137 bytes
emf_00.emf
5805c932025c7e35961b75cb2899d17cbae7490483daf5b5eb86d5b27bc826ec		 ooxml-emf OOXML EMF part: xl/media/image6.emf 1145328 bytes

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