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

Static analysis result for SHA-256 12b6116974f1dd42…

MALICIOUS

Office (OOXML) / .XLSX

12.5 KB Created: 2021-02-14 05:51:27 UTC Authoring application: Microsoft Excel 12.0000
MD5: 97680c19eb7372a5a6104836eb2eacf6 SHA-1: f89fd944584b2f9da2c716d395a5b342315b53d2 SHA-256: 12b6116974f1dd42d7ae0c4d57cbba29ed3e8a069096c9991e9d5210330ace36
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate anomalous Equation Editor native stream data consistent with CVE-2018-0798, suggesting exploitation for client execution. The document body content appears to be a list of medical supplies, likely a lure, and no scripts were extracted.

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
b6090544bac28a32c29f29727f510968b57e41559dd42ac8e2bdb52400edbad9		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
0f5acbda55600ee580029ab48c41092fb95b23bd6dabd9c5e9681f1eb4f3b796		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10Native 1976 bytes

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