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

Static analysis result for SHA-256 907f25e742d578c2…

MALICIOUS

Office (OOXML) / .XLSX

1.27 MB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: 8413604c6310c664a29c665a90387623 SHA-1: 54a236ea95168f9766e6ff802e12f44c72b2d1ca SHA-256: 907f25e742d578c236d2e5fe268380e3ec25098599bdcb8b283c8c03c300dfc2
110 Risk Score

Malware Insights

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

The sample is an Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. This object exhibits anomalies in its Ole10Native stream, indicating it carries a payload. The presence of a hidden worksheet further suggests an attempt to conceal malicious activity. The primary attack vector appears to be exploitation of the Equation Editor vulnerability to execute a secondary payload.

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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
ed60933dc4e0a3f2554e89ae71ffda96aa59da1fa3931e0b98b4e85e708bcae2		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 867840 bytes
ooxml_oleobject_00_ole10native_00.bin
8e13cb950d8a4fcdf2d0eb01ba5f40e0f169340a1a2087fafd7152975c8955b8		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLE10NatiVe 858120 bytes
ooxml_oleobject_01.bin
e4661d0f55c0667465c20f34f3eca9c669b6667373aaaac590e5a3fa3420343e		 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
emf_00.emf
9861cfca94e60fda64702922c3fa317953f78ca516427aaef8780827a65fcf09		 ooxml-emf OOXML EMF part: xl/media/image10.emf 648132 bytes
emf_01.emf
a4af199cd2f36a9ef1c062ae55753311b1ad890b74a2ddc865accce82abc267d		 ooxml-emf OOXML EMF part: xl/media/image11.emf 7608 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.