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

Static analysis result for SHA-256 b447b219de2202a7…

MALICIOUS

Office (OOXML) / .XLSX

585.3 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-17
MD5: 871cbe0e041b5e36ce3c22398bef5cea SHA-1: 4c40e86464552f32255473e2d7ee34a8af838386 SHA-256: b447b219de2202a76d19369d4714c191e9f13035ba8b1377136d4ae7fb9ebf09
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The file is an OOXML document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. This object carries a payload-like Ole10Native stream with an anomalous size, strongly indicating the exploitation of a known vulnerability within the Equation Editor. The presence of this object suggests the file is designed to deliver a secondary malicious payload upon opening.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/0NKlHD7d9.7Ys2MM8 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
13c1df2f24870e91d9ebd7e66815655e02ad6523b5969f3ddfbacd661cff3dc4		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/0NKlHD7d9.7Ys2MM8 800768 bytes
ooxml_oleobject_00_ole10native_00.bin
4d7a1717c739c82a6ea483d72c128c250f2325da53d94f302b8a4f1c83ef5f72		 ole-package OOXML xl/embeddings/0NKlHD7d9.7Ys2MM8 Ole10Native stream: ole10natiVe 791849 bytes

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