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

Static analysis result for SHA-256 05043fcca50e25b1…

MALICIOUS

Office (OOXML) / .XLSX

736.8 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-10-05
MD5: 8fa1f9e46e207fdfa4c0e8d7003077e8 SHA-1: a741123623a834ed92409865a7d5bf1eb1ec648d SHA-256: 05043fcca50e25b160798b41a6443526b76f7c8501995f5ca59bbf39ce9b3d4d
140 Risk Score

Malware Insights

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

The file is an OOXML document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate anomalies within the Equation Editor's native stream, pointing to exploitation of CVE-2018-0798. This suggests the embedded object is designed to execute a malicious payload when the document is opened, likely leading to further system compromise.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/usct.2T 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
d02e560cac90a30399ba13d86ac6d6ad4ad969e81e517b8b1fabf4d6363830a6		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/usct.2T 978944 bytes
ooxml_oleobject_00_ole10native_00.bin
b54a34477aa61cb0fc47cf06a9632431da421944b8db1809c7729735ebb8ee89		 ole-package OOXML xl/embeddings/usct.2T Ole10Native stream: olE10NATIve 968986 bytes

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