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

Static analysis result for SHA-256 616ef3719a501fe1…

MALICIOUS

Office (OOXML) / .XLSX

1.35 MB Created: 2025-10-08 01:54:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: 31b631c04401dd8f0e5b7aec973fe600 SHA-1: c28ba61bc2a3ee1cdd0730339e77ed293a769328 SHA-256: 616ef3719a501fe10e6c160c577e021a3e2338e72de08cde14d3631b801f41c6
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded OLE object that exploits CVE-2018-0798 in the Equation Editor. This vulnerability allows for arbitrary code execution when the embedded object is activated. No further payloads or network indicators were observed in the static analysis.

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
86fff1c5b9545d0eb10e9bd14fe72281eb4e5ef553d1a1f352ab8d2d916127bf		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes
ooxml_oleobject_00_ole10native_00.bin
b6a1f7432db0227a9f81658c8cf94d757bff3c0490c0276db819d743e5eb150c		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: olE10natIVE 1359 bytes

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