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

Static analysis result for SHA-256 5e019efe4f395e59…

MALICIOUS

Office (OOXML) / .XLSX

1.27 MB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: aff3c186fad17cff411da9fc003313b1 SHA-1: 12a72f321229143e3d05956344d17600e16e2afa SHA-256: 5e019efe4f395e59309e1639d81db03d57919316eeae7f2ab26c29685886c163
110 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is an Office Open XML (OOXML) XLSX document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and size discrepancy, strongly suggesting exploitation of a vulnerability within the Equation Editor component. This is a common vector for delivering 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
6f59590f408eed7d36ad737ff32d1367923f8d04f9879d47c19ad1ac83d866ae		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 985600 bytes
ooxml_oleobject_00_ole10native_00.bin
39aa48f87b91bf00c89d0ac0157b1163700144c295227f1e2b7ad22038674aa5		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLE10naTivE 974879 bytes
ooxml_oleobject_01.bin
ec2459fd678942d576a59cf8f7189ff92b4357cfa7c0227f8e76cb958a694493		 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
3907dc07a224caef79b80b8802d529caae02f837344ff64c32cb775a914c30cf		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Microsoft_Office_Word_Macro-Enabled_Document1.docm 122518 bytes
emf_00.emf
9950e5b8124d25b87ddaef649a3bd2103b7c7b071d2d157b461dfa66d4a8c222		 ooxml-emf OOXML EMF part: xl/media/image9.emf 648132 bytes
emf_01.emf
a676698d1f4b171ebc75f06c059eee2dda3ee13b154cd98e72af3961afb32dee		 ooxml-emf OOXML EMF part: xl/media/image10.emf 7608 bytes

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