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

Static analysis result for SHA-256 e1f9c445e13d2e62…

MALICIOUS

Office (OOXML) / .XLSX

14.4 KB Created: 2023-11-17 18:26:59 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2024-05-24
MD5: 58aa00083e85f5bb83a5f1f3d34f9dba SHA-1: 3078e0d320221456887deca6b205e8df8c26e7b8 SHA-256: e1f9c445e13d2e625f2f46696e4e9ae07a3151f83eff5fb8ae4a2c09c587cb2a
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking

The file is an Excel spreadsheet containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate this object is anomalous and exploits CVE-2018-0798. The document body presents financial data, likely a lure to encourage interaction with the malicious embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/oleObject1.bin 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.
  • 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
5c5c925693eaf4d9d5841446ed2924cf9049d5f0d349c14db44f6c25287800c3		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
c76984959e1e6a56edaf754006fab18fa643a5bbe72bf5ae2465550dc0c4e715		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: olE10NaTiVE 1845 bytes

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