njRat PE Executable malware analysis – 575cd6a9c08c

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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

Medium

1 malicious · 9 files

EXE575cd6a9c08cc71abf27eaa866c53a38njRat

Structure

BINResources

BIN.Net Resources

Config. Field	Value
Key (AES_256)	a2N5Smhuhuhuhuhuhuhuhuhuhuhu
Pastebin	-huhuhuhu
Certificate	MIIE8jhuhuhuhuhuhuhuhuhuhuhu
ServerSignature	bcGDOihuhuhuhuhuhuhuhuhuhuhu
Install	fhuhuhuhu
BDOS	fhuhuhuhu
Anti-VM	fhuhuhuhu
Hosts	shawwhuhuhuhuhuhuhu
Ports	7huhuhuhu
Mutex	0.huhuhuhu
Delay	5huhuhuhu
Group	4ij9huhuhuhu

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=v4.6
Total Strings	136
Main Method	System.Void Client.Program::Main()
Main IL Instruction Count	37
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 IL_0007: ldc.i4 1000 call System.Boolean Client.Settings::InitializeSettings() brtrue IL_0035: nop ldc.i4.0 <null> call System.Void System.Environment::Exit(System.Int32) nop <null> call System.Boolean Client.Helper.MutexControl::CreateMutex() brtrue IL_0046: call System.Void Client.Helper.Methods::PreventSleep() ldc.i4.0 <null> call System.Void System.Environment::Exit(System.Int32) call System.Void Client.Helper.Methods::PreventSleep() leave IL_0056: nop pop <null> leave IL_0056: nop nop <null> call System.Boolean Client.Connection.ClientSocket::get_IsConnected() brtrue IL_006B: leave IL_0076 call System.Void Client.Connection.ClientSocket::Reconnect() call System.Void Client.Connection.ClientSocket::InitializeClient() leave IL_0076: ldc.i4 5000 pop <null> leave IL_0076: ldc.i4 5000 ldc.i4 5000 call System.Void System.Threading.Thread::Sleep(System.Int32) br IL_0056: nop
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=v4.6
Total Strings	136
Main Method	System.Void Client.Program::Main()
Main IL Instruction Count	37
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 IL_0007: ldc.i4 1000 call System.Boolean Client.Settings::InitializeSettings() brtrue IL_0035: nop ldc.i4.0 <null> call System.Void System.Environment::Exit(System.Int32) nop <null> call System.Boolean Client.Helper.MutexControl::CreateMutex() brtrue IL_0046: call System.Void Client.Helper.Methods::PreventSleep() ldc.i4.0 <null> call System.Void System.Environment::Exit(System.Int32) call System.Void Client.Helper.Methods::PreventSleep() leave IL_0056: nop pop <null> leave IL_0056: nop nop <null> call System.Boolean Client.Connection.ClientSocket::get_IsConnected() brtrue IL_006B: leave IL_0076 call System.Void Client.Connection.ClientSocket::Reconnect() call System.Void Client.Connection.ClientSocket::InitializeClient() leave IL_0076: ldc.i4 5000 pop <null> leave IL_0076: ldc.i4 5000 ldc.i4 5000 call System.Void System.Threading.Thread::Sleep(System.Int32) br IL_0056: nop

Key (AES_256) MUTEXmalicious

a2N5Smhuhuhuhuhuhuhuhuhuhuhu

CnC CNCmalicious

shawwhuhuhuhuhuhuhu

Ports PORTmalicious

7huhuhuhu

Mutex MUTEXmalicious

0.huhuhuhu

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