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

Static analysis result for SHA-256 d0a85ca6f20185dd…

MALICIOUS

Office (OOXML) / .XLSX

653.2 KB Created: 2023-09-27 08:05:40 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-28
MD5: 48fd8814b0f841ce210bd8815592a30f SHA-1: 91406232f55a3cba2d59729049b5f939835b1c80 SHA-256: d0a85ca6f20185dd947706900ea660403a869342ea43ac8cfbde3e504ddea42b
100 Risk Score

Malware Insights

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

The file contains an embedded OLE object, specifically identified as an Equation Editor object. This object exhibits an anomaly where the Ole10Native stream appears to carry a payload, indicated by its size and entropy, suggesting it's designed to exploit a vulnerability or deliver a secondary stage. The presence of this anomalous OLE object is a strong indicator of malicious intent, likely for exploitation or payload delivery.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/tIdRC.Z1Rsk1A 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
973549b1d2ae84dcdae9dea9eca2d4c255834a524443f6e0506c749a8b9f3711		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/tIdRC.Z1Rsk1A 981504 bytes
ooxml_oleobject_00_ole10native_00.bin
16930beecec06149dde105af21692bc64cef8e6cfc33dc9d9b36efb5a0ed4675		 ole-package OOXML xl/embeddings/tIdRC.Z1Rsk1A Ole10Native stream: OLE10natIvE 971635 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.