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

Static analysis result for SHA-256 3edc9e2553233663…

MALICIOUS

Office (OOXML) / .XLSX

14.7 KB Created: 2023-03-13 06:58:13 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-03-29
MD5: 4366c50260ecf5183d95ba2e66177513 SHA-1: 343a23dd2faf25f6bc8a5947dc39d5f761193b13 SHA-256: 3edc9e2553233663516a611ced3681f9128a77de55d6aa4cea0e0fd8b81bf47f
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The file is an Excel document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798 due to anomalous Equation Editor native stream data. The document body presents a fake order form, suggesting a social engineering pretext to encourage user interaction with the 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
01abd806c8d6613bb345544ef208194b46859ac1db341885725806cfffc39231		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes
ooxml_oleobject_00_ole10native_00.bin
b2b2b0c264803aad939ba943ddb160ead3d3003cc9d74843aed461d0ac6d666b		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10NaTive 1375 bytes

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