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

Static analysis result for SHA-256 5a03d922533b932c…

MALICIOUS

Office (OOXML) / .XLSX

403.6 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: dee7dd98dfd51cca27c337e6244f1f5b SHA-1: bcd9c177a9ce61a8a4eae1867ac3caf2118e8919 SHA-256: 5a03d922533b932c9f35bdce6d0938af8121d39137d178002b310b4f19badaed
110 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The sample is an 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 presence of a hidden worksheet further supports the likelihood of malicious intent, often used to conceal payloads or staging data. No document body or script content was available for analysis, but the core finding is the exploitation of the Equation Editor vulnerability.

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
8bc788fe8527f2818c0d2a2c583d6b06d9a991eb0eee26661631b10eeff2ccde		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
0ac261a3dd7e4e01964f219403d88223318e7b3fa6ccbb196bf2cd9da56151f7		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: olE10NAtiVe 1683 bytes
emf_00.emf
df2ed56094dc6aa5c2af4974c2b1d93843e4dbe4627a7c18719b7a1025c4022a		 ooxml-emf OOXML EMF part: xl/media/image5.emf 648132 bytes

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