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

Static analysis result for SHA-256 bd3cc4919131d7e1…

MALICIOUS

Office (OOXML) / .XLSX

635.9 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-30
MD5: 1337ea2077b91bfb80ec40a656725885 SHA-1: 633d5dee3f2d2ce31d6c07232878bd991a6eac92 SHA-256: bd3cc4919131d7e1452cb6aaec05aa0048bf562f26143f6bab2b03c1dc59a6e0
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The sample is an OOXML file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's designed to exploit a vulnerability. This is a common delivery mechanism for exploiting Equation Editor vulnerabilities to execute arbitrary code.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/TY6mfPQJ.xj 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
96f84c40f83ec4952e32fa4784cc976876cf7c95608de4a68455db419cf43395		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/TY6mfPQJ.xj 912384 bytes
ooxml_oleobject_00_ole10native_00.bin
9da87ff175da6fe7cb3916470f1785a5541116a4483482fa4b67230e58734b87		 ole-package OOXML xl/embeddings/TY6mfPQJ.xj Ole10Native stream: OlE10nAtivE 903080 bytes

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