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

Static analysis result for SHA-256 718c24fa701c41ed…

MALICIOUS

Office (OOXML) / .XLSX

1.24 MB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: 5da70207adda2774db5970cc949fa146 SHA-1: b283be63ba62290b95ff59e5dfa36aa0962b77a8 SHA-256: 718c24fa701c41ed99e254aabfa5357cdcda8e78a90891e9b6c6de04d10a6e56
110 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample contains a high-severity heuristic indicating an embedded Equation Editor OLE object that carries a payload-like Ole10Native stream. This strongly suggests exploitation of a known vulnerability within the Equation Editor component to achieve arbitrary code execution. The presence of hidden sheets further supports the concealment of malicious content.

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.
  • 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
  • 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 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
0aab0a17e18c09f7debceef96e674c2aa7bfe5f35173b44e8325b3a96f3d3ddb		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject2.bin 10240 bytes
ooxml_oleobject_00_ole10native_00.bin
59fb77315591a55324873430963abffa12244adc4996302250a87d8a758a5796		 ole-package OOXML xl/embeddings/oleObject2.bin Ole10Native stream: Ole10Native 8667 bytes
ooxml_oleobject_01.bin
47565bec599b99808ff5228086d87580734892ae6a6e510ea86cf83f117ae641		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 1029632 bytes
ooxml_oleobject_01_ole10native_00.bin
8e9c1f952f2c634dc08f0e0a7c8b5b8c18f60ecf0992c35d0f31943cdb673a8e		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLe10NaTiVe 1019246 bytes
ooxml_oleobject_02.bin
9fdce1bb49250cef38dae0a5e0c231d96514c43928488bf9ad25de6f59ffaec6		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Microsoft_Office_Word_Macro-Enabled_Document1.docm 122521 bytes
emf_00.emf
6226b27e6c042a7fda47df5ee7800dcbf63a66c1175c9a53498d2a165fa8254a		 ooxml-emf OOXML EMF part: xl/media/image9.emf 648132 bytes
emf_01.emf
8ac009ea06c6000f39d9b1d4a05461c1e529b3810ccc8cba713f5fb28df2d27b		 ooxml-emf OOXML EMF part: xl/media/image10.emf 7608 bytes

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