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

Static analysis result for SHA-256 11524de267127179…

MALICIOUS

Office (OOXML) / .XLSX

12.0 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 14.0300
MD5: 02b141788d802162dd247620fc111114 SHA-1: 7a305f949a6ff3e4f6c97252b36efbe24a973bb3 SHA-256: 11524de2671271798703e08a4f07adfbc9fe8aeaaac78c07ea83bdc82712729f
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel document containing an embedded OLE object, specifically an Equation Editor object. High-severity heuristics indicate the exploitation of CVE-2018-0798, which allows for arbitrary code execution. The document body contains what appears to be a fabricated price list, likely a lure to disguise the malicious nature of 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
d144c0304ea01a6ca9c930dd159fbae48f4fa3e6ef91a6d9f0a73805929f60fd		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes
ooxml_oleobject_00_ole10native_00.bin
1a63a6340bbe7cacdd3179767c1efd98ad23df25f739198b611ba6ed1c72d778		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLE10nATiVe 1241 bytes

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