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

Static analysis result for SHA-256 dcb9941977155241…

MALICIOUS

Office (OOXML) / .XLSX

658.0 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-10
MD5: f4153314f800b828c26d099cd5cd70f3 SHA-1: fd5109724a81232f4b83623e240d293a46ca29db SHA-256: dcb994197715524188ad55b1f57ed96fe65ac6217b7c454df940956eaf086a8b
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The sample is an Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries an anomalous Ole10Native stream, suggesting it contains a malicious payload. The anomaly in the Ole10Native stream's declared size versus its actual stream size points towards an exploit targeting the Equation Editor component.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/N46JbDRFE.zlZv0 contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY
    Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
  • 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
ff573a888a4b25852bb20bb5b671d657629fffee8e4d5ce322210771ba11cdd5		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/N46JbDRFE.zlZv0 937472 bytes
ooxml_oleobject_00_ole10native_00.bin
3f17e814ff49c93805e660ca61a55079b462d781d0f88e18eb0bfc652455404d		 ole-package OOXML xl/embeddings/N46JbDRFE.zlZv0 Ole10Native stream: oLE10nATiVe 927398 bytes

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