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

Static analysis result for SHA-256 6f8debb6acde9b5b…

MALICIOUS

Office (OOXML) / .XLSX

466.3 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: 24bd4a3d25c469bb138fb16e587dbf02 SHA-1: 563d37fde327ea4fb70fa3959079f72161711722 SHA-256: 6f8debb6acde9b5b878188327ea348102cc125e8f72245f79fb39967821a91fa
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. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798, which targets a vulnerability in the Equation Editor to achieve arbitrary code execution. The presence of hidden sheets further suggests an attempt to conceal malicious activity.

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://ns.adobe.com/xap/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/tiff/1.0/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
c7837f336bdcb260acc189aa866568ec41a72e122472e75f7fea458c60528dc5		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
bfc183bbc585f4f8238ff91833fb7d963f055ee470adf665144a4d9a7f56edf9		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: olE10NatIVE 1667 bytes
ooxml_oleobject_01.bin
660640cfdaf85913dce41c314694fc38fada058e3270e6ec7a3c6f5eb471f72d		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Microsoft_Office_Word_Macro-Enabled_Document1.docm 127574 bytes
emf_00.emf
78f617893ec39d55ed68dee6e6a55f1c1b1653e46458fa55851c975c06403264		 ooxml-emf OOXML EMF part: xl/media/image7.emf 653280 bytes

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