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

Static analysis result for SHA-256 03310e5677705d67…

MALICIOUS

Office (OOXML) / .XLSX

37.5 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300
MD5: eb57884ef883f253f324f0bd9a476bf3 SHA-1: a554e9d0feca3657e9b55eaf124ee59154d481ce SHA-256: 03310e5677705d676c834eaef1ffad96fff6cc7f50e618c08c29853db06e94f9
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is a malicious Excel document containing an embedded OLE object that exploits CVE-2018-0798 via the Equation Editor. This vulnerability allows for arbitrary code execution when the object is activated.

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
c73fc5a4599cedea610c8d0f17f981c3ffabbf32bd5e9c3d35f0fef8dd90bacb		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
af555634d90f2bf19b076f862b505992ead9fd19d51b927c6c6c646afa49801d		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10NativE 1766 bytes

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