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

Static analysis result for SHA-256 53e44ac1e55383e6…

MALICIOUS

Office (OOXML) / .XLSX

739.3 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-28
MD5: 9e66e6414cf9660cf25de8032fc5135b SHA-1: 194239f2ee8db0c86b940b60b6722b62ec02fee2 SHA-256: 53e44ac1e55383e6d231d302d6abf040b409921b59b4450d68522bfd57cf8fe5
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559 Component Object Model and Distributed Component Object Model T1559.001 Component Object Model

The sample is an Excel file containing an embedded OLE object identified as an Equation Editor. This object exhibits an anomaly where the Ole10Native stream is significantly larger than its declared size, indicating it likely carries a malicious payload. The presence of this anomalous OLE object is a strong indicator of a delivery mechanism for malware.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/NKxTxseh.V2 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
8eb3a2422f49a4e8ba0745b90baff624d973d11dc00760a993f1caa6986491b2		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/NKxTxseh.V2 1080320 bytes
ooxml_oleobject_00_ole10native_00.bin
b152c05dd3f725be761baf93f47d46daba248432aa4f5fa46a8f35a20bd0546e		 ole-package OOXML xl/embeddings/NKxTxseh.V2 Ole10Native stream: OLe10nATive 1069239 bytes

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