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

Static analysis result for SHA-256 7ded94da0f651747…

MALICIOUS

Office (OOXML) / .XLSX

321.0 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: 74cb90e5f69bc9fd64beebfce2af08ed SHA-1: 17f49d026d3a93c89ad222f7f45d72c07e915d39 SHA-256: 7ded94da0f651747fe6e5a5d31a907fc85d3f22f818cfc66eaa5fbfe0886759f
110 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: User Execution T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model and Distributed Component Object Model

The sample is an Office Open XML (OOXML) file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate this object exploits CVE-2018-0798 due to an anomalous Equation Editor native stream. This suggests the file is designed to leverage this vulnerability upon opening 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
8b8cf7dc99c74c7dcee39bb737e19de9691a84011047522242530023c67f9ba7		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
17c2d36486d23130f136233647999d560f2cef466fb98e4edf790f0c6470caf8		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OlE10NaTIVe 1916 bytes
emf_00.emf
b6bea3236f5d0dd2b79d657277d20b4c28b834961ee18989d80fb7429c6d974c		 ooxml-emf OOXML EMF part: xl/media/image4.emf 648132 bytes

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