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

Static analysis result for SHA-256 444956ff637afaa1…

MALICIOUS

Office (OOXML) / .XLSX

705.6 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-07-04
MD5: 1ae15f8226dbde840373ab623936b5e6 SHA-1: 9213147207d49edf7d093105b45fb6fc037c8024 SHA-256: 444956ff637afaa1216a86176b0f305176cbeacc691254c560653915d07b9268
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking

The sample is an Excel spreadsheet containing an embedded OLE object identified as an Equation Editor. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream, with an anomalous size difference between the declared inner size and the actual stream size. This strongly suggests the object is being used to deliver a secondary malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/w3A.VQCSKQ 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
761995c4b51c9650534fcb865b87550306f6e14587580b20023bed1b76134d98		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/w3A.VQCSKQ 1046528 bytes
ooxml_oleobject_00_ole10native_00.bin
9005df296cd2e75e05c115d34c79656e188e808e3f9166257418f4937bcebf23		 ole-package OOXML xl/embeddings/w3A.VQCSKQ Ole10Native stream: oLE10NATIve 1036228 bytes

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