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

Static analysis result for SHA-256 0070dab47a3777b2…

MALICIOUS

Office (OOXML) / .XLSX

27.8 KB Created: 2021-08-19 14:03:52 UTC Authoring application: Microsoft Excel 15.0300
MD5: 5797d89148151bfa38e0ba8ede50f434 SHA-1: 9b6c564fc1b4e272fcfb11fa030ed1889e5b22cb SHA-256: 0070dab47a3777b272b7a6471d4cec59bc3cc8c0d456999de9d16e991c7fbcd9
100 Risk Score

Malware Insights

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

The file is an Excel document containing an embedded Equation Editor OLE object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798 due to anomalous native stream data. This suggests the document is designed to exploit this vulnerability to execute a malicious payload.

Heuristics 3

  • 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.
  • CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY
    Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
  • 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
e72d76722c867bb7ae3079f5bf379e97c84f57fd556863605f2bfe1750321e2f		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
5ace3705917d2f9ec0977cbda6673d967f72794d156e76bb739b93d8ca039afb		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OlE10naTIVe 1690 bytes

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