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

Static analysis result for SHA-256 41cdff6bc198b4e0…

MALICIOUS

Office (OOXML) / .XLSX

12.1 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 14.0300
MD5: 26fb9be7ad9081b89d87feb8cba98a6b SHA-1: 5039eb2a3a68d37d7b35f5ffb79b82cfce0331f4 SHA-256: 41cdff6bc198b4e041d092b52663f0ea0dd06334e70c62b595710e214cb8e3d9
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File T1059.003 Windows Command Shell

The sample is an Office document containing an embedded OLE object, specifically identified as a Microsoft 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. This suggests the document is designed to exploit this vulnerability, likely to download and execute a secondary payload. No specific malware family was identified, and no external URLs or 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
7e0a0c98272077ce0af00a6f8e9d6a76e97f8a19abc71a6d8de79f8065f51424		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes
ooxml_oleobject_00_ole10native_00.bin
0b8c78ff23b574e061adabd4edc8346a574c967ed2ec7ccbdefb2be101becf89		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLE10naTiVE 1312 bytes

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