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

Static analysis result for SHA-256 e7bb0d3e85853e8d…

MALICIOUS

Office (OOXML) / .XLSX

718.2 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-23
MD5: 72edaf7f88cbeb3d676d0d680ecdb26d SHA-1: 0556bccec5a1ab6dee085c12fcf5b4c91868c133 SHA-256: e7bb0d3e85853e8dca7d852cf6cbe362aa9e858fa1138f334fbc775cd3ced2f0
140 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The sample is an Excel file containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and size difference, strongly suggesting exploitation of a vulnerability within the Equation Editor component. This is a common technique for delivering second-stage malware.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/NDQ.qQ5 contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • NOP sled detected high SC_NOP_SLED
    Found 20+ consecutive 0x90 bytes
  • 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
50b862e061c9db41027c0e9ff2b7c1bf066f4a52a5ed8e4cb422ed6d67df5ff0		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/NDQ.qQ5 1009664 bytes
ooxml_oleobject_00_ole10native_00.bin
263eba9e92500389c3a116bab7f737109fb2e98433efd1196cc7e473a01650b3		 ole-package OOXML xl/embeddings/NDQ.qQ5 Ole10Native stream: OlE10NaTiVe 999258 bytes

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