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

Static analysis result for SHA-256 c4e96331070d67a9…

MALICIOUS

Office (OOXML) / .XLSX

729.9 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-10-10
MD5: 836f0689ff8057d9d1faeb2eda38444d SHA-1: 2839ef3951d7f0e0b37be0198bb61e5999a0ff14 SHA-256: c4e96331070d67a9f99e51248f36cb9b27044158a1332803e31bb2b67f642dcd
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The sample is an Office document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous structure, suggesting it is designed to exploit a vulnerability. The embedded OLE object is the primary indicator of malicious intent, likely leading to the execution of a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/uP0MbyhO.nSiwAs 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
9170f4403f90cfe323efc32c2e5f0d73f7a4e11aa7fa55d10ce29af4ae157014		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/uP0MbyhO.nSiwAs 1043968 bytes
ooxml_oleobject_00_ole10native_00.bin
0c03056e6a06cf9e26ca5257427a92b7b32cf557fd0d20e88762c5a02295ca1d		 ole-package OOXML xl/embeddings/uP0MbyhO.nSiwAs Ole10Native stream: oLe10Native 1033309 bytes

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