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

Static analysis result for SHA-256 7c57887cf38cd893…

MALICIOUS

Office (OOXML) / .XLSX

425.0 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: 2d3190b90e5fe98e9d7339545d1e0d8f SHA-1: 59b9fce07b319958bb21d790630427ba7f8cf5df SHA-256: 7c57887cf38cd893e504986115a87f3b524d6d38f9a5d01667af466c8c8cdfbc
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file 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 file is designed to exploit this vulnerability upon opening.

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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
4e3e2db0271ab7f9caf8946b7f299e16c0695e924850e4f348bcaf6f6bf373a7		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
12fa3bc75e991fc4cd8526331309c3b2faa4d16cc7979af948914a15726e3ec1		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLe10NatIVe 1875 bytes
ooxml_oleobject_01.bin
b58b0f70c2bdea649fb75d3eabcb63e8b0dca838d32ad2b81dcb3ede1a7cfa38		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject2.bin 1614848 bytes
ooxml_oleobject_01_ole10native_00.bin
ae6173ee54937f64c652977a63ceeb27438c18c8874634ccf808a82e16b09e02		 ole-package OOXML xl/embeddings/oleObject2.bin Ole10Native stream: Ole10Native 1599780 bytes
emf_00.emf
5ec13fdb116fad2a722159ac55f98a857e0925759bcaeb75ac83fccbf7c3e8c2		 ooxml-emf OOXML EMF part: xl/media/image6.emf 3199944 bytes

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