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

Static analysis result for SHA-256 5e2ed2f6c3574fda…

MALICIOUS

Office (OOXML) / .XLSX

222.4 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: 918770f7790afbb62e65684d4ded6162 SHA-1: 314e2a9a6d188071d2612c975932e0817a005e8d SHA-256: 5e2ed2f6c3574fda36b991348012ac244b24172432bc4919d09cf3ea0d245cd4
108 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. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798 due to anomalous native stream data within the Equation Editor object. This suggests the file is designed to exploit this vulnerability for client-side code execution.

Heuristics 4

  • 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
  • Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET
    Excel workbook contains 1 hidden sheet(s) — hidden sheets are commonly used to conceal macro code, staging data, or intermediate payload construction

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
daf182e109cb4a437880639af788d50d213c4de3a454590e98c659b39f7a8049		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes
ooxml_oleobject_00_ole10native_00.bin
6d90c56152352aa12267785606eaa6c7a2b99fe423b668ac418fbf3f1e9849fb		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLe10NAtIvE 1279 bytes
ooxml_oleobject_01.bin
3c445bc3f3933d62e5823b2f5a8ed3209ab360f85d1f7ae7f89942f0eafda7ef		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Microsoft_Office_Word_Macro-Enabled_Document1.docm 28352 bytes
emf_00.emf
f0af95b954183d6413e2fd5079debccfc05451d36c6a908a6cada6d5a1b351cc		 ooxml-emf OOXML EMF part: xl/media/image8.emf 498420 bytes

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