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

Static analysis result for SHA-256 b1425cafd29d74ac…

MALICIOUS

Office (OOXML) / .XLSM

11.3 KB Created: 2023-09-05 08:35:25 UTC Authoring application: WPS Spreadsheets First seen: 2023-09-07
MD5: 0cd15695db9e6646481c03bb48230d02 SHA-1: b295862db6cfde9eae6cbfd6fea253e714e0ce39 SHA-256: b1425cafd29d74ace4c4f772acea0b7e94142ec7dfb756696d9de99d0fce2fc1
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is an XLSM document containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate a potential exploitation of CVE-2018-0798 due to an anomalous Equation Editor native stream. This suggests the file is designed to exploit a vulnerability in the Equation Editor component of Microsoft Office to achieve arbitrary code execution.

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
e640fa6a18ec6831254752c9821cf7dd17de9c2f0d3d700606edd0c1df97422b		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes
ooxml_oleobject_00_ole10native_00.bin
10b05eaa37e7617c6f884e9e23377ee277ee4e64b166b2d2482a574fa586a233		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLE10NATIvE 1480 bytes

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