QuasarRat PE Executable malware analysis – d52cc6f8f2df

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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 .NETUPolyX 0.3 -> delikon

Symbol obfuscation

Low

1 malicious · 8 files

EXEd52cc6f8f2df2ec03155e1ffa7a7ff96QuasarRat

Structure

VBSOverlay_21720d2c.bin

BINResources

BIN.Net Resources

Config. Field	Value
Conf. AES-Salt	BF-EB-huhuhuhuhuhuhuhuhuhuhu
Conf. AES-Key	Y7gtFhhuhuhuhuhuhuhu
Version	1.huhuhuhu
Port	2huhuhuhu
Host	51.1huhuhuhu
ReconnectDelay	3huhuhuhu
SubDirectory	1WvgEMhuhuhuhuhuhuhu
InstallName	NcFtjbhuhuhuhuhuhuhuhuhuhuhu
Install	7huhuhuhu
Startup	7zhuhuhuhu
Mutex	0huhuhuhu
StartupKey	0huhuhuhu
HideFile	mcCwahuhuhuhuhuhuhu
EnableLogger	7huhuhuhu
Tag	0huhuhuhu
LogDirectory	1huhuhuhu
ServerSignature	Thuhuhuhu
ServerCertificate	Lhuhuhuhu
InstallPath	0huhuhuhu
LogsPath	0huhuhuhu
UnattendedMod	0huhuhuhu

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

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Name	Value
Info	Overlay extracted: Overlay_21720d2c.bin (10485764 bytes)
Module Name	Client.exe
Full Name	Client.exe
EntryPoint	System.Void xClient.Program::Main(System.String[])
Scope Name	Client.exe
Scope Type	ModuleDef
Kind	Windows
Runtime Version	v4.0.30319
Tables Header Version	512
WinMD Version	<null>
Assembly Name	Client
Assembly Version	1.3.0.0
Assembly Culture	<null>
Has PublicKey	False
PublicKey Token	<null>
Target Framework	.NETFramework,Version=v4.0,Profile=Client
Total Strings	1062
Main Method	System.Void xClient.Program::Main(System.String[])
Main IL Instruction Count	19
Main IL	call System.Void System.Windows.Forms.Application::EnableVisualStyles() ldc.i4.0 <null> call System.Void System.Windows.Forms.Application::SetCompatibleTextRenderingDefault(System.Boolean) call System.AppDomain System.AppDomain::get_CurrentDomain() ldnull <null> ldftn System.Void xClient.Program::HandleUnhandledException(System.Object,System.UnhandledExceptionEventArgs) newobj System.Void System.UnhandledExceptionEventHandler::.ctor(System.Object,System.IntPtr) callvirt System.Void System.AppDomain::add_UnhandledException(System.UnhandledExceptionEventHandler) call System.Boolean xClient.Config.Settings::Initialize() brfalse.s IL_0040: call System.Void xClient.Program::Cleanup() call System.Boolean xClient.Program::Initialize() brfalse.s IL_0040: call System.Void xClient.Program::Cleanup() call System.Boolean xClient.Core.Networking.QuasarClient::get_Exiting() brtrue.s IL_0040: call System.Void xClient.Program::Cleanup() ldsfld xClient.Core.Networking.QuasarClient xClient.Program::ConnectClient callvirt System.Void xClient.Core.Networking.QuasarClient::Connect() call System.Void xClient.Program::Cleanup() call System.Void xClient.Program::Exit() ret <null>
Module Name	Client.exe
Full Name	Client.exe
EntryPoint	System.Void xClient.Program::Main(System.String[])
Scope Name	Client.exe
Scope Type	ModuleDef
Kind	Windows
Runtime Version	v4.0.30319
Tables Header Version	512
WinMD Version	<null>
Assembly Name	Client
Assembly Version	1.3.0.0
Assembly Culture	<null>
Has PublicKey	False
PublicKey Token	<null>
Target Framework	.NETFramework,Version=v4.0,Profile=Client
Total Strings	1062
Main Method	System.Void xClient.Program::Main(System.String[])
Main IL Instruction Count	19
Main IL	call System.Void System.Windows.Forms.Application::EnableVisualStyles() ldc.i4.0 <null> call System.Void System.Windows.Forms.Application::SetCompatibleTextRenderingDefault(System.Boolean) call System.AppDomain System.AppDomain::get_CurrentDomain() ldnull <null> ldftn System.Void xClient.Program::HandleUnhandledException(System.Object,System.UnhandledExceptionEventArgs) newobj System.Void System.UnhandledExceptionEventHandler::.ctor(System.Object,System.IntPtr) callvirt System.Void System.AppDomain::add_UnhandledException(System.UnhandledExceptionEventHandler) call System.Boolean xClient.Config.Settings::Initialize() brfalse.s IL_0040: call System.Void xClient.Program::Cleanup() call System.Boolean xClient.Program::Initialize() brfalse.s IL_0040: call System.Void xClient.Program::Cleanup() call System.Boolean xClient.Core.Networking.QuasarClient::get_Exiting() brtrue.s IL_0040: call System.Void xClient.Program::Cleanup() ldsfld xClient.Core.Networking.QuasarClient xClient.Program::ConnectClient callvirt System.Void xClient.Core.Networking.QuasarClient::Connect() call System.Void xClient.Program::Cleanup() call System.Void xClient.Program::Exit() ret <null>

CnC CNCmalicious

51.1huhuhuhu

Port PORTmalicious

2huhuhuhu

URLs in VB Code - #1 URIsuspect

http:/huhuhuhuhuhuhuhuhuhuhu

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