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

Static analysis result for SHA-256 3a23505e90df25fe…

MALICIOUS

Office (OOXML) / .XLSX

14.2 KB Created: 2023-11-17 18:26:59 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2024-05-28
MD5: 613bc31f40a70c787c70e5fa82ba3da6 SHA-1: d689a647a7254e5a9d349a61e951c0629b43a473 SHA-256: 3a23505e90df25fe34b92eebb73fa08d4571d3f12b12807711325d16a3ec2db9
100 Risk Score

Malware Insights

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

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. This suggests the file is designed to leverage this vulnerability for initial execution, likely to download and run a secondary payload.

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
cb13b0b3f42efddf921bdedc959aa2af7036c60a4b81a0147a6ba1a0a757cd0a		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
905790ac8ae3203bca3e6ae1ad9ead885e01fd0aef51f85898f16e8c85c05d0f		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: ole10nAtive 1706 bytes

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