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

Static analysis result for SHA-256 fa35ea7ba7e1adca…

MALICIOUS

Office (OOXML) / .XLSX

12.4 KB Created: 2021-02-14 05:51:27 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-06-02
MD5: ecf55676f1c72b1b1b24cd0190fd0a7d SHA-1: 8ef6a268201f490feae99fd73a555ed9cecb59d0 SHA-256: fa35ea7ba7e1adcac6ddede3d0c54bab06183f47315ece58fbb701dc6af9e2b3
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate the presence of CVE-2018-0798, an anomaly within the Equation Editor's native stream, which is a known vulnerability for arbitrary code execution. The document body content appears to be a list of medical supplies, likely a lure to disguise the malicious embedded object.

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
a272e46233e479a05875909921e039d391955b015dff75e8587bf777fddc40cd		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
eee035432449d8c83f87ebd5cb7b82d0d63bca8fe2b12c8d9e34de07b6175853		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLe10NATIVe 1796 bytes

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