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

Static analysis result for SHA-256 4f9f55fa6fd56012…

MALICIOUS

Office (OOXML) / .XLSX

769.8 KB Created: 2020-06-30 06:04:05 UTC Authoring application: Microsoft Excel 15.0300
MD5: 7e6772d1f721741a177edcd467682ad6 SHA-1: 7c63da94c2703308677f81d3afc2c7bde70f1abf SHA-256: 4f9f55fa6fd5601245068c412d1d458928de826e6d02362c1ff62ca6bd8891a7
60 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking

The sample is an Excel file containing an embedded OLE object identified as an Equation Editor. This is a common technique used to exploit vulnerabilities in the Equation Editor component to execute arbitrary code. The presence of this object strongly suggests the file is a malicious dropper.

Heuristics 2

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/698n.CAS contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • 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
545871dd6e299f2ff74dd60a273ab7bfcc804f165d1e99d5c0e9b7b82f5aff60		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/698n.CAS 896000 bytes
ooxml_oleobject_00_ole10native_00.bin
8c75ac51e2a5227d11fb0506b69af10ed123ac9e9dfdf0a492e70aa0b73cdf51		 ole-package OOXML xl/embeddings/698n.CAS Ole10Native stream: ole10Native 886687 bytes

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