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

Static analysis result for SHA-256 6b6748ad5b356c4c…

MALICIOUS

Office (OOXML) / .XLSX

13.6 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: 0fcc0bddf19ef0fb5bb8505a8eda5cd8 SHA-1: 12c077937e6fbaf66f5a5e58c831709d4d5edfe8 SHA-256: 6b6748ad5b356c4c0c1d57c914b73ad15f4f0ecb21084b4a59bc194473aed32e
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate the presence of CVE-2018-0798, a vulnerability associated with anomalous Equation Editor native streams. This suggests the document is designed to exploit this vulnerability for client-side code execution.

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
1abca9fdf501e5a0b07281e2095e2fb0a84afd7ffc866fa473b58cd7dfdb80fa		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes
ooxml_oleobject_00_ole10native_00.bin
fee65d21b16bf2a07e03bf9fba737f889e5e6d08ed8a9c15be34a5ce2cbb0209		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10naTIve 1491 bytes

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