scemu
map files
x86 32/64 位元模擬器，用於安全地模擬惡意軟體和其他內容。
https://www.youtube.com/@JesusOlmos-wm8ch/videos https://www.youtube.com/watch?v=yJ3Bgv3maq0
Python 應用程式 https://pypi.org/search/?q=pyscemu
Rust 應用程式 https://crates.io/crates/libscemu
SCEMU emulator for malware 0.7.10
@sha0coder
USAGE:
scemu [FLAGS] [OPTIONS]
FLAGS:
-6, --64bits enable 64bits architecture emulation
--banzai skip unimplemented instructions, and keep up emulating what can be emulated
-h, --help Prints help information
-l, --loops show loop interations, it is slow.
-m, --memory trace all the memory accesses read and write.
-n, --nocolors print without colors for redirectin to a file >out
-r, --regs print the register values in every step.
-p, --stack trace stack on push/pop
-t, --test test mode
-V, --version Prints version information
-v, --verbose -vv for view the assembly, -v only messages, without verbose only see the api calls and goes
faster
OPTIONS:
-b, --base <ADDRESS> set base address for code
-c, --console <NUMBER> select in which moment will spawn the console to inspect.
-C, --console_addr <ADDRESS> spawn console on first eip = address
-a, --entry <ADDRESS> entry point of the shellcode, by default starts from the beginning.
-f, --filename <FILE> set the shellcode binary file.
-i, --inspect <DIRECTION> monitor memory like: -i 'dword ptr [ebp + 0x24]
-M, --maps <PATH> select the memory maps folder
--mxcsr <MXCSR> set mxcsr register
--r10 <R10> set r10 register
--r11 <R11> set r11 register
--r12 <R12> set r12 register
--r13 <R13> set r13 register
--r14 <R14> set r14 register
--r15 <R15> set r15 register
--r8 <R8> set r8 register
--r9 <R9> set r9 register
--rax <RAX> set rax register
--rbp <RBP> set rbp register
--rbx <RBX> set rbx register
--rcx <RCX> set rcx register
--rdi <RDI> set rdi register
--rdx <RDX> set rdx register
-R, --reg <REGISTER1,REGISTER2> trace a specific register in every step, value and content
--rflags <RFLAGS> set rflags register
--rsi <RSI> set rsi register
--rsp <RSP> set rsp register
-x, --script <SCRIPT> launch an emulation script, see scripts_examples folder
--stack_address <ADDRESS> set stack address
-s, --string <ADDRESS> monitor string on a specific address
-T, --trace <TRACE_FILENAME> output trace to specified file
scemu 模擬一個偵測 execve() 中斷的簡單 shellcode。 
我們選擇要停止的線路並檢查記憶體。 
在 Linux 中模擬 GuLoader win32 的近 200 萬條指令後，偽造 cpuid 和其他技巧，得到一個 sigtrap 來迷惑調試器。 
api 載入器上的記憶體轉儲範例。 
預設有多個地圖，可以使用 LoadLibraryA 等 api 或從控制台手動建立更多地圖。
基於列印訊息的 LdrLoadDLl() 模擬基本 Windows shellcode： 
控制台允許檢視和編輯 cpu 的當前狀態：
--- console ---
=>h
--- help ---
q ...................... quit
cls .................... clear screen
h ...................... help
s ...................... stack
v ...................... vars
r ...................... register show all
r reg .................. show reg
rc ..................... register change
f ...................... show all flags
fc ..................... clear all flags
fz ..................... toggle flag zero
fs ..................... toggle flag sign
c ...................... continue
ba ..................... breakpoint on address
bi ..................... breakpoint on instruction number
bmr .................... breakpoint on read memory
bmw .................... breakpoint on write memory
bc ..................... clear breakpoint
n ...................... next instruction
eip .................... change eip
push ................... push dword to the stack
pop .................... pop dword from stack
fpu .................... fpu view
md5 .................... check the md5 of a memory map
seh .................... view SEH
veh .................... view vectored execption pointer
m ...................... memory maps
ma ..................... memory allocs
mc ..................... memory create map
mn ..................... memory name of an address
ml ..................... memory load file content to map
mr ..................... memory read, speficy ie: dword ptr [esi]
mw ..................... memory read, speficy ie: dword ptr [esi] and then: 1af
md ..................... memory dump
mrd .................... memory read dwords
mds .................... memory dump string
mdw .................... memory dump wide string
mdd .................... memory dump to disk
mt ..................... memory test
ss ..................... search string
sb ..................... search bytes
sba .................... search bytes in all the maps
ssa .................... search string in all the maps
ll ..................... linked list walk
d ...................... dissasemble
dt ..................... dump structure
enter .................. step into
cobalt Strike api 載入器與 Metasploit 相同，模擬它： 
Cobalt Strike API 稱為： 
Metasploit rshell API 呼叫： 
Metasploit SGN 編碼器使用很少的 fpu 來隱藏多型性： 
同樣以 fpu 開頭的 Metasploit shikata-ga-nai 編碼器： 
顯示PEB結構：
=>dt
structure=>peb
address=>0x7ffdf000
PEB {
reserved1: [
0x0,
0x0,
],
being_debugged: 0x0,
reserved2: 0x0,
reserved3: [
0xffffffff,
0x400000,
],
ldr: 0x77647880,
process_parameters: 0x2c1118,
reserved4: [
0x0,
0x2c0000,
0x77647380,
],
alt_thunk_list_ptr: 0x0,
reserved5: 0x0,
reserved6: 0x6,
reserved7: 0x773cd568,
reserved8: 0x0,
alt_thunk_list_ptr_32: 0x0,
reserved9: [
0x0,
...
顯示PEB_LDR_DATA結構：
=>dt
structure=>PEB_LDR_DATA
address=>0x77647880
PebLdrData {
length: 0x30,
initializated: 0x1,
sshandle: 0x0,
in_load_order_module_list: ListEntry {
flink: 0x2c18b8,
blink: 0x2cff48,
},
in_memory_order_module_list: ListEntry {
flink: 0x2c18c0,
blink: 0x2cff50,
},
in_initialization_order_module_list: ListEntry {
flink: 0x2c1958,
blink: 0x2d00d0,
},
entry_in_progress: ListEntry {
flink: 0x0,
blink: 0x0,
},
}
=>
顯示 LDR_DATA_TABLE_ENTRY 和第一個模組名稱
=>dt
structure=>LDR_DATA_TABLE_ENTRY
address=>0x2c18c0
LdrDataTableEntry {
reserved1: [
0x2c1950,
0x77647894,
],
in_memory_order_module_links: ListEntry {
flink: 0x0,
blink: 0x0,
},
reserved2: [
0x0,
0x400000,
],
dll_base: 0x4014e0,
entry_point: 0x1d000,
reserved3: 0x40003e,
full_dll_name: 0x2c1716,
reserved4: [
0x0,
0x0,
0x0,
0x0,
0x0,
0x0,
0x0,
0x0,
],
reserved5: [
0x17440012,
0x4000002c,
0xffff0000,
],
checksum: 0x1d6cffff,
reserved6: 0xa640002c,
time_date_stamp: 0xcdf27764,
}
=>
惡意軟體在異常中隱藏了某些內容
3307726 0x4f9673: push ebp
3307727 0x4f9674: push edx
3307728 0x4f9675: push eax
3307729 0x4f9676: push ecx
3307730 0x4f9677: push ecx
3307731 0x4f9678: push 4F96F4h
3307732 0x4f967d: push dword ptr fs:[0]
Reading SEH 0x0
-------
3307733 0x4f9684: mov eax,[51068Ch]
--- console ---
=>
讓我們檢查一下異常結構：
--- console ---
=>r esp
esp: 0x22de98
=>dt
structure=>cppeh_record
address=>0x22de98
CppEhRecord {
old_esp: 0x0,
exc_ptr: 0x4f96f4,
next: 0xfffffffe,
exception_handler: 0xfffffffe,
scope_table: PScopeTableEntry {
enclosing_level: 0x278,
filter_func: 0x51068c,
handler_func: 0x288,
},
try_level: 0x288,
}
=>
這裡我們有錯誤例程 0x4f96f4 和過濾器 0x51068c
