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

Static analysis result for SHA-256 4ae2512ceafc6313…

MALICIOUS

Office (OOXML) / .XLSX

19.3 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300
MD5: 04acb80600ff43a151eb54def4aa758b SHA-1: 6fbf12cdcab381902243ec98138d58c2ff3bc381 SHA-256: 4ae2512ceafc63133c2472dfcc8399c302fd001306c81511f4133ddc390a5101
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Office Open XML spreadsheet containing an embedded OLE object. Heuristic analysis indicates this object is a Microsoft Equation Editor object that exploits CVE-2018-0798. This vulnerability allows for arbitrary code execution when the embedded object is activated, typically by opening the document.

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
269b4b89c98a54cde9c17ef56d7d94f03d747cdcc45c66bfda934f21f0882de9		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
476dd3f10262e4925544dc86f604b0ca297a8e1bce1b0bfcbc93b7b6ceb80467		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLE10Native 1606 bytes

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