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

Static analysis result for SHA-256 fcb3960d1af3f212…

MALICIOUS

Office (OOXML) / .XLSX

355.9 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: 0917de211f33e7ac2f5bfd7b347fbdbb SHA-1: bc221f8b710b8210ecae5a84a9692a2255784ec3 SHA-256: fcb3960d1af3f2128d7bc46e07a7751916ec5c3832e7806df7902f787c94dd40
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 exploitation of CVE-2018-0798 due to an anomalous Equation Editor native stream. This suggests the file is designed to leverage this vulnerability to execute arbitrary code. No document body or scripts were extracted, but the presence of the vulnerable OLE object is a strong indicator of exploit delivery.

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
b1d2df71cb4555733f9c39c50b3189d3713739c234b0a3455f174e684555d1eb		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes
ooxml_oleobject_00_ole10native_00.bin
e3e3b468e1484dbbd1b6f9b66e832457fe05947e4a92f1473d727f28135bbc0d		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: ole10NAtivE 1172 bytes
emf_00.emf
3fb5b85e13ad433e11bc2a41cfd7bddb308325cf5e928e3e4e5a07e78b74aa9f		 ooxml-emf OOXML EMF part: xl/media/image3.emf 648132 bytes

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