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

Static analysis result for SHA-256 1c83e7c291e82890…

MALICIOUS

Office (OOXML) / .XLSX

677.0 KB Created: 2023-09-27 08:05:40 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-27
MD5: 45e27ac07546c007b19cda8493526734 SHA-1: be9333c7c5dabac149a105a6c644cd68e07b6b01 SHA-256: 1c83e7c291e828901ec5d1c627e00633385842e6c8b3f6905fc8c5194e97715e
100 Risk Score

Malware Insights

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

The file contains 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, suggesting it's designed to exploit vulnerabilities. The presence of this object strongly indicates an attack pattern leveraging Equation Editor exploits to deliver a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/XUx20PSz.j983c8 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
bef8f4d2da4c487b19ee762a8e718f48e82e1c33eecd6353b94e22e164dc823e		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/XUx20PSz.j983c8 957952 bytes
ooxml_oleobject_00_ole10native_00.bin
613f29e8487440768a926e689a4e117361e65100bc9634f304a4b703fec2124b		 ole-package OOXML xl/embeddings/XUx20PSz.j983c8 Ole10Native stream: OLe10nAtIve 948199 bytes

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