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

Static analysis result for SHA-256 9b5645b0f5e2fbbb…

MALICIOUS

Office (OOXML) / .XLSX

37.6 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300
MD5: 596b83a169467280b5e047f498eeaa33 SHA-1: 4d36aad5a72e14082ec57274921f503a9ae29aa1 SHA-256: 9b5645b0f5e2fbbb8ec8c45c1a4e82922f73a7b6c28dbc6c5f397ad9bda83f77
100 Risk Score

Malware Insights

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

The file is an Office document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate the presence of CVE-2018-0798, an anomaly within the Equation Editor's native stream, suggesting exploitation for client execution. No further stages or IOCs were extracted from this sample.

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
e42daf16b30d6b6b3a2f141d3456dd5f90137068912f26821e12146ba452874b		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
0deb546e5d348d1f5849d96beb8be879628292b36d8998e9f5ad2cc2e4edcd3e		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10naTive 1769 bytes

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