njRat PE Executable malware analysis – b4acfa761365

Ctrl + scroll to zoom · drag to pan

Get an AI-generated breakdown of this malware's behaviour, IOCs and recommendations.

AI analysis is available with Essential.

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

EXEb4acfa761365af70d2e7bb34c76a2845njRat

Structure

BINResources

Config. Field	Value
Key (AES_256)	R3J0Rkhuhuhuhuhuhuhuhuhuhuhu
Pastebin	-huhuhuhu
Certificate	MIIE8jhuhuhuhuhuhuhuhuhuhuhu
ServerSignature	Cxb53khuhuhuhuhuhuhuhuhuhuhu
Install	thuhuhuhu
BDOS	fhuhuhuhu
Anti-VM	fhuhuhuhu
Install File	taskhuhuhuhuhuhuhu
Install-Folder	%Aphuhuhuhu
Hosts	balajihuhuhuhuhuhuhu
Ports	4huhuhuhu
Mutex	TLNShuhuhuhu
Version	0huhuhuhu
Delay	3huhuhuhu
Group	Dehuhuhuhu

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

Unlock with Essential

Name	Value
Module Name	taskhostw.exe
Full Name	taskhostw.exe
EntryPoint	System.Void Client.Program::Main()
Scope Name	taskhostw.exe
Scope Type	ModuleDef
Kind	Windows
Runtime Version	v4.0.30319
Tables Header Version	512
WinMD Version	<null>
Assembly Name	taskhostw
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	120
Main Method	System.Void Client.Program::Main()
Main IL Instruction Count	51
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: nop pop <null> leave IL_0099: nop nop <null> call System.Boolean Client.Connection.ClientSocket::get_IsConnected() brtrue IL_00AE: leave IL_00B9 call System.Void Client.Connection.ClientSocket::Reconnect() call System.Void Client.Connection.ClientSocket::InitializeClient() leave IL_00B9: ldc.i4 5000 pop <null> leave IL_00B9: ldc.i4 5000 ldc.i4 5000 call System.Void System.Threading.Thread::Sleep(System.Int32) br.s IL_0099: nop
Module Name	taskhostw.exe
Full Name	taskhostw.exe
EntryPoint	System.Void Client.Program::Main()
Scope Name	taskhostw.exe
Scope Type	ModuleDef
Kind	Windows
Runtime Version	v4.0.30319
Tables Header Version	512
WinMD Version	<null>
Assembly Name	taskhostw
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	120
Main Method	System.Void Client.Program::Main()
Main IL Instruction Count	51
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: nop pop <null> leave IL_0099: nop nop <null> call System.Boolean Client.Connection.ClientSocket::get_IsConnected() brtrue IL_00AE: leave IL_00B9 call System.Void Client.Connection.ClientSocket::Reconnect() call System.Void Client.Connection.ClientSocket::InitializeClient() leave IL_00B9: ldc.i4 5000 pop <null> leave IL_00B9: ldc.i4 5000 ldc.i4 5000 call System.Void System.Threading.Thread::Sleep(System.Int32) br.s IL_0099: nop

Key (AES_256) MUTEXmalicious

R3J0Rkhuhuhuhuhuhuhuhuhuhuhu

CnC CNCmalicious

balajihuhuhuhuhuhuhu

Ports PORTmalicious

4huhuhuhu

Mutex MUTEXmalicious

TLNShuhuhuhu

Full artefact values (URLs, paths, registry keys, scripts…) are available with Essential.

Unlock with Essential