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

Static analysis result for SHA-256 fb1c76c73489e919…

MALICIOUS

Office (OOXML) / .XLSX

12.4 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 14.0300
MD5: c85ed4a74d4f1fec9e693fbbf51bbb0f SHA-1: 128992b897f290255eef9e5f291660c28cf4558f SHA-256: fb1c76c73489e919e88506b2ef6a2ba9831a64913efd1f2a216f12759c52ec94
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file contains an embedded Equation Editor OLE object that triggers CVE-2018-0798. This indicates the document is designed to exploit a vulnerability in the Equation Editor component to achieve code execution. The presence of an OLE object and the specific CVE firing strongly suggest a malicious intent, likely to download and execute a second-stage payload.

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
30ddc53d2b1cc3375c73f88e66e8a15f5162411365b6eea3d9b1945f95cb0131		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
9ad79b41ab1a0ab7424fa2c9f8f9d6f73f18eccd833d64102cf8efc22572ae64		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10nAtIve 1704 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.