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

Static analysis result for SHA-256 b04415e5e272de7e…

MALICIOUS

Office (OOXML) / .XLSX

743.3 KB Created: 2019-11-27 09:20:57 UTC Authoring application: Microsoft Excel 12.0000
MD5: e771b036522a92c23b58ad1892f986f3 SHA-1: f8f46e18956fcb696c42ca06a81b65c270531c36 SHA-256: b04415e5e272de7e3ed49858011f9cd780edd4f25bd428d2634f4a18637a4859
100 Risk Score

Malware Insights

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

The XLSX file contains an embedded OLE object associated with the Equation Editor, a known vector for exploiting vulnerabilities like CVE-2017-11882. The object contains a large, high-entropy Ole10Native stream with malformed sizing, indicative of an exploit payload. This suggests the document is designed to deliver and execute arbitrary code upon opening.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/lBsnD.SJ81vQ 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
00ec292299fb181f4811f739787a8c8c54d80297456ff471576c7c3d6c94f575		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/lBsnD.SJ81vQ 1095168 bytes
ooxml_oleobject_00_ole10native_00.bin
a585244f42621397561d8a837ec4240290f8d4da1771ab671e17760acd53d8f8		 ole-package OOXML xl/embeddings/lBsnD.SJ81vQ Ole10Native stream: oLE10NatiVe 1084129 bytes

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