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

Static analysis result for SHA-256 78a7f08640f3e427…

MALICIOUS

Office (OOXML) / .XLSX

1.23 MB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: dbf4bdeb0b98e90cade01fcc7a7f97ce SHA-1: 97f74e58db8fa0e9709a8eb8ae0931227629c369 SHA-256: 78a7f08640f3e427929c4cc885d1f92fe30b6f992e43158a0159a9b5dbf8cd99
110 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Office Open XML spreadsheet containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate this object carries a payload-like stream with an anomalous header and size, strongly suggesting exploitation of a vulnerability within the Equation Editor component. This technique is commonly used to achieve arbitrary code execution.

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
d5245e242d3f1c41a6006c8cda580124c5b517c53cfa7ab134dc3595251314c7		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 1060864 bytes
ooxml_oleobject_00_ole10native_00.bin
7bc4f755a733924b8f9de37aa31221e1c381bd1c87bff46c51b67a4c379852f3		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10NAtiVe 1049609 bytes
ooxml_oleobject_01.bin
31cc8ff5fd9cb9cd0c378f71d9314e118af1d7b7d6e28ba87cc931c65f047480		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject2.bin 10240 bytes
ooxml_oleobject_01_ole10native_00.bin
59fb77315591a55324873430963abffa12244adc4996302250a87d8a758a5796		 ole-package OOXML xl/embeddings/oleObject2.bin Ole10Native stream: Ole10Native 8667 bytes
ooxml_oleobject_02.bin
64d92f2c41c5713ab009e0f57033b847ddbe514b98d50427fbffe531d9251631		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Microsoft_Office_Word_Macro-Enabled_Document1.docm 122524 bytes
emf_00.emf
1a6fae3d850c393eb6bebbbea488a61eca8e2899042cba684a2d1e496a0170da		 ooxml-emf OOXML EMF part: xl/media/image8.emf 648132 bytes
emf_01.emf
ede1b23b7b2d30aef8c2e0f5d3af8349f3764da8300ed3f0b1e148fc48b47e3a		 ooxml-emf OOXML EMF part: xl/media/image9.emf 7608 bytes

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