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

Static analysis result for SHA-256 de080488de6cb4a9…

MALICIOUS

Office (OOXML) / .XLSX

607.2 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-23
MD5: 6f761d5816c0434b920cd6ae8cd0539e SHA-1: dac460b64e53f9afac455e99c6a9e8f6f97025c8 SHA-256: de080488de6cb4a9876c5f7e77f819c549e23e03128552b533b7d735646d45ca
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking

The sample is an OOXML file containing an embedded OLE object identified as an Equation Editor. This object exhibits an anomalous Ole10Native stream, with a declared inner size significantly larger than the actual stream size, strongly indicating it carries a malicious payload. The presence of this anomalous object suggests an attempt to exploit vulnerabilities or deliver a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/cmeL5P.Dxc9Np 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
9a224634b36ad1ff82e5578e245e751475d23d3795e8505a3fab522a6569231d		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/cmeL5P.Dxc9Np 875520 bytes
ooxml_oleobject_00_ole10native_00.bin
d0ff18ee7c7d39bdf9d89f7548d436af098558a4429dc42972496ebf272ceefc		 ole-package OOXML xl/embeddings/cmeL5P.Dxc9Np Ole10Native stream: OLE10NATive 866033 bytes

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