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

Static analysis result for SHA-256 2de0c18d85fca20d…

MALICIOUS

Office (OOXML) / .XLSX

836.9 KB Created: 2021-08-09 02:12:21 UTC Authoring application: Microsoft Excel 12.0000
MD5: d5619af9dcb82b4fcf13d08f312d336c SHA-1: 0429d9096c8525bae87d6b9620622d85588c5d09 SHA-256: 2de0c18d85fca20d6eda95cdd001d39c9d4cab93b2e30a8f9d6ede13fb725737
140 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The sample is a malicious Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this object exploits CVE-2018-0798, a vulnerability in the Equation Editor. The object carries a payload-like Ole10Native stream, suggesting it's designed to execute arbitrary code upon interaction.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/i4Z.9VKaM contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY
    Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
  • 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
9620bfb7918c30018d6af25882410ce310e99cc1f958306d011f5a8b7511dd27		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/i4Z.9VKaM 1096192 bytes
ooxml_oleobject_00_ole10native_00.bin
7fd59f1578571db0d96c544264afb0f0035425e76df07652879c3df91401269b		 ole-package OOXML xl/embeddings/i4Z.9VKaM Ole10Native stream: OLe10NaTIve 1085162 bytes

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