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

Static analysis result for SHA-256 5a913bd302e961c6…

MALICIOUS

Office (OOXML) / .XLSX

641.8 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-07-30
MD5: f758efbdef50de7e366d63bf3de15c05 SHA-1: 7245cb0c58d25e4896252581bc88c1fc53a02e6b SHA-256: 5a913bd302e961c677b2cc66afce102569929634c4c46384c004a4964b848a4f
100 Risk Score

Malware Insights

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

The file is an Excel 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 header, suggesting it's designed to exploit a vulnerability. This is a common delivery mechanism for malicious payloads.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/vn.0FDBtN 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
58a2b0fe80b9df57375212bb0c7dbaac828134ec0b09f8a15d83d2cb9c2a9fb7		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/vn.0FDBtN 881664 bytes
ooxml_oleobject_00_ole10native_00.bin
5c86a258b6f0e93ad0f04be3dd08c8257845ab3eff71bd3520bffc2564fa6a8a		 ole-package OOXML xl/embeddings/vn.0FDBtN Ole10Native stream: OLE10NatIve 872418 bytes

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