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

Static analysis result for SHA-256 06c93e21d4089524…

MALICIOUS

Office (OOXML) / .XLSX

613.9 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300
MD5: 5836f1e3d7055892bb5fb6f2a0ba7388 SHA-1: 6f77c444767fba7b974f719c46ecca4f9ac2772f SHA-256: 06c93e21d40895243e161dab5973972beda07bdb9263cb115f1b5af5db63cf44
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel 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 and size, strongly suggesting exploitation of a known vulnerability (e.g., CVE-2017-11882) for client execution. The embedded object itself is the primary indicator of compromise.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/OX.vkqOrz 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
bffc99873c0cdd69d0e42a34b033af8991958848305fcfcb9b5653021b18cf25		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/OX.vkqOrz 852480 bytes
ooxml_oleobject_00_ole10native_00.bin
70c5c0c828819505306e2d30ba035ff8381f20daa7de12f696f0336f11cdf5f9		 ole-package OOXML xl/embeddings/OX.vkqOrz Ole10Native stream: OLE10NATive 843534 bytes

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