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

Static analysis result for SHA-256 c18de46177428639…

MALICIOUS

Office (OOXML) / .XLSX

632.8 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300
MD5: 5c7f684a43e87f3f9bf1c24615ced206 SHA-1: 297cb06f278f36e46c580a399774099bdee22704 SHA-256: c18de4617742863946fb451839fa0f95f06f0a0210978165179331177a2b7928
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The sample is an Excel spreadsheet containing an embedded OLE object identified as an Equation Editor. This object exhibits an anomalous Ole10Native stream, with a declared inner size significantly larger than the actual stream size, strongly indicating it carries a malicious payload. The presence of this anomalous object suggests the file is designed to exploit vulnerabilities or deliver malware upon opening.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/m2XcH.b55lra4 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
1c705550248f676c48571d4e00869cf06770841edd3cf9665dfed06da41addfa		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/m2XcH.b55lra4 935424 bytes
ooxml_oleobject_00_ole10native_00.bin
1f748ea8ed99e380d37cfe844f1847199225a1414abf9735058965a87f99ae19		 ole-package OOXML xl/embeddings/m2XcH.b55lra4 Ole10Native stream: Ole10naTIvE 925413 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.