njRat PE Executable malware analysis – c8e5903d595c

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File

Detection

PeID

.NET executableMicrosoft Visual C# / Basic .NETMicrosoft Visual C# / Basic.NET / MS Visual Basic 2005 - ASL Microsoft Visual C# v7.0 / Basic .NETMicrosoft Visual Studio .NET

Symbol obfuscation

Low

1 malicious · 3 files

EXEc8e5903d595cdf05ba803f58b5873b60njRat

Structure

BINResources

Config. Field	Value
Key (AES_256)	bXJ4ZFhuhuhuhuhuhuhuhuhuhuhu
Pastebin	-huhuhuhu
Certificate	MIIE8jhuhuhuhuhuhuhuhuhuhuhu
ServerSignature	X+Gzkuhuhuhuhuhuhuhuhuhuhuhu
Install	thuhuhuhu
BDOS	fhuhuhuhu
Anti-VM	fhuhuhuhu
Install File	seznahuhuhuhuhuhuhu
Install-Folder	%Aphuhuhuhu
Version	0.huhuhuhu
Ports	6606huhuhuhuhuhuhu
Mutex	dathuhuhuhu
Delay	5huhuhuhu
Group	zvjshuhuhuhuhuhuhu

We extracted this malware's full configuration (C2, credentials, campaign IDs…).

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Name	Value
Module Name	AsyncClient.exe
Full Name	AsyncClient.exe
EntryPoint	System.Void Client.Program::Main()
Scope Name	AsyncClient.exe
Scope Type	ModuleDef
Kind	Windows
Runtime Version	v4.0.30319
Tables Header Version	512
WinMD Version	<null>
Assembly Name	AsyncClient
Assembly Version	1.0.0.0
Assembly Culture	<null>
Has PublicKey	False
PublicKey Token	<null>
Target Framework	.NETFramework,Version=v4.0,Profile=Client
Total Strings	121
Main Method	System.Void Client.Program::Main()
Main IL Instruction Count	50
Main IL	ldc.i4.0 <null> stloc.0 <null> br IL_0015: ldloc.0 ldc.i4 1000 call System.Void System.Threading.Thread::Sleep(System.Int32) ldloc.0 <null> ldc.i4.1 <null> add <null> stloc.0 <null> ldloc.0 <null> ldsfld System.String Client.Settings::Delay call System.Int32 System.Convert::ToInt32(System.String) blt.s IL_0007: ldc.i4 1000 call System.Boolean Client.Settings::InitializeSettings() brtrue IL_0032: nop ldc.i4.0 <null> call System.Void System.Environment::Exit(System.Int32) nop <null> call System.Boolean Client.Helper.MutexControl::CreateMutex() brtrue IL_0043: ldsfld System.String Client.Settings::Anti ldc.i4.0 <null> call System.Void System.Environment::Exit(System.Int32) ldsfld System.String Client.Settings::Anti call System.Boolean System.Convert::ToBoolean(System.String) brfalse IL_0057: ldsfld System.String Client.Settings::Install call System.Void Client.Helper.Anti_Analysis::RunAntiAnalysis() ldsfld System.String Client.Settings::Install call System.Boolean System.Convert::ToBoolean(System.String) brfalse IL_006B: ldsfld System.String Client.Settings::BDOS call System.Void Client.Install.NormalStartup::Install() ldsfld System.String Client.Settings::BDOS call System.Boolean System.Convert::ToBoolean(System.String) brfalse IL_0089: call System.Void Client.Helper.Methods::PreventSleep() call System.Boolean Client.Helper.Methods::IsAdmin() brfalse IL_0089: call System.Void Client.Helper.Methods::PreventSleep() call System.Void Client.Helper.ProcessCritical::Set() call System.Void Client.Helper.Methods::PreventSleep() leave IL_0099: call System.Boolean Client.Connection.ClientSocket::get_IsConnected() pop <null> leave IL_0099: call System.Boolean Client.Connection.ClientSocket::get_IsConnected() call System.Boolean Client.Connection.ClientSocket::get_IsConnected() brtrue IL_00AD: newobj System.Void System.Random::.ctor() call System.Void Client.Connection.ClientSocket::Reconnect() call System.Void Client.Connection.ClientSocket::InitializeClient() newobj System.Void System.Random::.ctor() ldc.i4 2000 ldc.i4 5000 callvirt System.Int32 System.Random::Next(System.Int32,System.Int32) call System.Void System.Threading.Thread::Sleep(System.Int32) br.s IL_0099: call System.Boolean Client.Connection.ClientSocket::get_IsConnected()
Module Name	AsyncClient.exe
Full Name	AsyncClient.exe
EntryPoint	System.Void Client.Program::Main()
Scope Name	AsyncClient.exe
Scope Type	ModuleDef
Kind	Windows
Runtime Version	v4.0.30319
Tables Header Version	512
WinMD Version	<null>
Assembly Name	AsyncClient
Assembly Version	1.0.0.0
Assembly Culture	<null>
Has PublicKey	False
PublicKey Token	<null>
Target Framework	.NETFramework,Version=v4.0,Profile=Client
Total Strings	121
Main Method	System.Void Client.Program::Main()
Main IL Instruction Count	50
Main IL	ldc.i4.0 <null> stloc.0 <null> br IL_0015: ldloc.0 ldc.i4 1000 call System.Void System.Threading.Thread::Sleep(System.Int32) ldloc.0 <null> ldc.i4.1 <null> add <null> stloc.0 <null> ldloc.0 <null> ldsfld System.String Client.Settings::Delay call System.Int32 System.Convert::ToInt32(System.String) blt.s IL_0007: ldc.i4 1000 call System.Boolean Client.Settings::InitializeSettings() brtrue IL_0032: nop ldc.i4.0 <null> call System.Void System.Environment::Exit(System.Int32) nop <null> call System.Boolean Client.Helper.MutexControl::CreateMutex() brtrue IL_0043: ldsfld System.String Client.Settings::Anti ldc.i4.0 <null> call System.Void System.Environment::Exit(System.Int32) ldsfld System.String Client.Settings::Anti call System.Boolean System.Convert::ToBoolean(System.String) brfalse IL_0057: ldsfld System.String Client.Settings::Install call System.Void Client.Helper.Anti_Analysis::RunAntiAnalysis() ldsfld System.String Client.Settings::Install call System.Boolean System.Convert::ToBoolean(System.String) brfalse IL_006B: ldsfld System.String Client.Settings::BDOS call System.Void Client.Install.NormalStartup::Install() ldsfld System.String Client.Settings::BDOS call System.Boolean System.Convert::ToBoolean(System.String) brfalse IL_0089: call System.Void Client.Helper.Methods::PreventSleep() call System.Boolean Client.Helper.Methods::IsAdmin() brfalse IL_0089: call System.Void Client.Helper.Methods::PreventSleep() call System.Void Client.Helper.ProcessCritical::Set() call System.Void Client.Helper.Methods::PreventSleep() leave IL_0099: call System.Boolean Client.Connection.ClientSocket::get_IsConnected() pop <null> leave IL_0099: call System.Boolean Client.Connection.ClientSocket::get_IsConnected() call System.Boolean Client.Connection.ClientSocket::get_IsConnected() brtrue IL_00AD: newobj System.Void System.Random::.ctor() call System.Void Client.Connection.ClientSocket::Reconnect() call System.Void Client.Connection.ClientSocket::InitializeClient() newobj System.Void System.Random::.ctor() ldc.i4 2000 ldc.i4 5000 callvirt System.Int32 System.Random::Next(System.Int32,System.Int32) call System.Void System.Threading.Thread::Sleep(System.Int32) br.s IL_0099: call System.Boolean Client.Connection.ClientSocket::get_IsConnected()

Key (AES_256) MUTEXmalicious

bXJ4ZFhuhuhuhuhuhuhuhuhuhuhu

Ports PORTmalicious

6huhuhuhu

Ports PORTmalicious

7huhuhuhu

Ports PORTmalicious

8huhuhuhu

Mutex MUTEXmalicious

dathuhuhuhu

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