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

Static analysis result for SHA-256 e4ddd3ba1f8bdb01…

MALICIOUS

Office (OOXML) / .XLSX

579.3 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: 284ee717e9586bfcc5c8f63d22a6cefd SHA-1: fbbbe0571bdbc7eb6d0338a566faa55f94b1c1b0 SHA-256: e4ddd3ba1f8bdb01d6316f7353402981fa65733f5b4369f49710ce1e263943f8
110 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model

The sample is an Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798 due to anomalous Equation Editor native stream properties. This suggests the file is designed to exploit this vulnerability to execute a malicious payload. No document body or scripts were extracted, limiting further analysis of the payload's intent.

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
9fad9762e297fa40ffd7ccf28a25b0baab21d2747c709d7e4826eea5854404be		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4608 bytes
ooxml_oleobject_00_ole10native_00.bin
5ce313b0af161024388beefe8e5143d0bc69c458314ffc23f9683a2a5dbdad0a		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: olE10natIvE 2148 bytes
ooxml_oleobject_01.bin
2014bd470a50cf77774524488bb66b9fb510aa97c3e487749ca2add8a7e62300		 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
9203d4277c4e42b41ba004d8d8967fc82322ccc4f1bc495b261b68ab285aea20		 ooxml-emf OOXML EMF part: xl/media/image9.emf 648132 bytes
emf_01.emf
d88558f0d322d4dac4d3835a2a8baa5d2395be79a388dd72623a9affc3c4d635		 ooxml-emf OOXML EMF part: xl/media/image10.emf 7788 bytes

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