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

Static analysis result for SHA-256 12be6161db060d29…

MALICIOUS

Office (OOXML) / .XLSX

8.9 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300
MD5: 9d9f72ab7836c06b9864cedc945bc7ee SHA-1: 1a8fba3f60feccaea3de39998512eee9dfc723a1 SHA-256: 12be6161db060d2995045dbd1a41d439d51833c1e349e7a157a9d091d686ec33
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798, which allows for arbitrary code execution. The embedded object's anomalous native stream further supports this finding.

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
611a1a698b48416c640bc88a02268184ccdcedf1423b10d78f1b0cb8e7925bbb		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
d21aa920686bb98614defb4dd078fb8d53536f428dc27fae7bcc30e3b515439a		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: olE10nATIvE 2047 bytes

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