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

Static analysis result for SHA-256 2bcccde5c0efe049…

MALICIOUS

Office (OOXML) / .XLSX

361.8 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: 168bac798ebac51315d67c8d9aa4207d SHA-1: 3e1d4d58bd9bb8cc9a091bf2ceb0f0a9cd5f4f30 SHA-256: 2bcccde5c0efe0492169361700b82ddb7d05a28128a88cac18559dade82291f0
110 Risk Score

Malware Insights

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

The sample is an Office Open XML (OOXML) file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate the presence of CVE-2018-0798, an anomaly within the Equation Editor's native stream, suggesting exploitation of this vulnerability. The embedded OLE object and the specific anomaly point towards a delivery mechanism that leverages the Equation Editor to execute malicious code. No document body or scripts were extracted, limiting further analysis of the payload's intent.

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.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
b23b712ebf8130c3d0ba6fb0be90a1c03a2ca88e6626727ef06e7d68b0ad89ea		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes
ooxml_oleobject_00_ole10native_00.bin
20fa0a6a208980be4284d32df65910bcd73317f974c23847fcea82059f728fd8		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: olE10NatiVe 1381 bytes
emf_00.emf
7b2e1f88ed2791788d881764a9c8c5b789ff8ab806b54653d9078c0e5f9939cf		 ooxml-emf OOXML EMF part: xl/media/image8.emf 498420 bytes

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