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

Static analysis result for SHA-256 daa48b59af257fff…

MALICIOUS

Office (OOXML) / .XLSX

581.6 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: 2331776f709a6b67971466e193de55cc SHA-1: cd3a1677e0912665a4d05c947320e74e18385421 SHA-256: daa48b59af257fffa64b4ebb3a9827e9bdc9c1a27051415b76e9b3aff78f07f5
110 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is an Excel spreadsheet containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate the presence of CVE-2018-0798, a vulnerability associated with the Equation Editor. This suggests the document is designed to exploit this vulnerability for arbitrary code execution. No scripts were extracted, and the document body was not available for analysis.

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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
5a42104ca7fb8e3e8949c1552a1e8d68ac6b64dadddbb3dbe4a96b45686af3ec		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
26cda4d68cc2957687e1417a95c840b24d753c6a99741b17b60217a98fb92e79		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10nATivE 1646 bytes
ooxml_oleobject_01.bin
f877a760345a2459feeb2c276109b70ee03388d545d7871080470ec7d722be89		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject2.bin 11776 bytes
ooxml_oleobject_01_ole10native_00.bin
2065a5e0f7398e87f76c05191fd323df059d099ddbb52bd9c3666a365e3efdce		 ole-package OOXML xl/embeddings/oleObject2.bin Ole10Native stream: Ole10Native 9788 bytes
emf_00.emf
91050a2fbb51a77c595ad42c47f6744fd2fdf0cb81aaac70fee1cbe95d0fb1e9		 ooxml-emf OOXML EMF part: xl/media/image9.emf 648132 bytes
emf_01.emf
11638fc783b057e26dbb10f862040ebffd9e09ecd0226a4c04e9f911258e41e8		 ooxml-emf OOXML EMF part: xl/media/image10.emf 7788 bytes

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