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vmprofiler
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added a few more vmprofiles...

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John Doe 3 years ago
parent eb91191526
commit b560b35284
8 changed files with 289 additions and 10 deletions
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2
CMakeLists.txt
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@ -54,6 +54,8 @@ list(APPEND vmprofiler_SOURCES
"src/vminstrs.cpp"
"src/vmlocate.cpp"
"src/vmprofiles/jmp.cpp"
"src/vmprofiles/lconst.cpp"
"src/vmprofiles/lreg.cpp"
"src/vmprofiles/sreg.cpp"
"src/vmutils.cpp"
"include/vmctx.hpp"

80
include/vminstrs.hpp
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@ -50,7 +50,7 @@ struct vinstr_t {
/// "64" here...where the SREGDW varient would have a "32" here... this is the
/// stack disposition essentially, or the value on the stack...
/// </summary>
u8 size;
u8 stack_size;
struct {
/// <summary>
@ -84,6 +84,7 @@ struct emu_instr_t {
/// </summary>
struct hndlr_trace_t {
std::uintptr_t m_hndlr_addr;
uc_engine* m_uc;
zydis_reg_t m_vip, m_vsp;
std::vector<emu_instr_t> m_instrs;
};
@ -137,11 +138,86 @@ struct profiler_t {
/// </summary>
extern profiler_t jmp;
extern profiler_t sreg;
extern profiler_t lreg;
extern profiler_t lconst;
/// <summary>
/// unsorted vector of profiles... they get sorted once at runtime...
/// </summary>
inline std::vector<profiler_t*> profiles = {&jmp, &sreg};
inline std::vector<profiler_t*> profiles = {&jmp, &sreg, &lreg, &lconst};
/// <summary>
/// no i did not make this by hand, you cannot clown upon me!
/// </summary>
inline std::map<zydis_reg_t, uc_x86_reg> reg_map = {
{ZYDIS_REGISTER_AL, UC_X86_REG_AL},
{ZYDIS_REGISTER_CL, UC_X86_REG_CL},
{ZYDIS_REGISTER_DL, UC_X86_REG_DL},
{ZYDIS_REGISTER_BL, UC_X86_REG_BL},
{ZYDIS_REGISTER_AH, UC_X86_REG_AH},
{ZYDIS_REGISTER_CH, UC_X86_REG_CH},
{ZYDIS_REGISTER_DH, UC_X86_REG_DH},
{ZYDIS_REGISTER_BH, UC_X86_REG_BH},
{ZYDIS_REGISTER_SPL, UC_X86_REG_SPL},
{ZYDIS_REGISTER_BPL, UC_X86_REG_BPL},
{ZYDIS_REGISTER_SIL, UC_X86_REG_SIL},
{ZYDIS_REGISTER_DIL, UC_X86_REG_DIL},
{ZYDIS_REGISTER_R8B, UC_X86_REG_R8B},
{ZYDIS_REGISTER_R9B, UC_X86_REG_R9B},
{ZYDIS_REGISTER_R10B, UC_X86_REG_R10B},
{ZYDIS_REGISTER_R11B, UC_X86_REG_R11B},
{ZYDIS_REGISTER_R12B, UC_X86_REG_R12B},
{ZYDIS_REGISTER_R13B, UC_X86_REG_R13B},
{ZYDIS_REGISTER_R14B, UC_X86_REG_R14B},
{ZYDIS_REGISTER_R15B, UC_X86_REG_R15B},
{ZYDIS_REGISTER_AX, UC_X86_REG_AX},
{ZYDIS_REGISTER_CX, UC_X86_REG_CX},
{ZYDIS_REGISTER_DX, UC_X86_REG_DX},
{ZYDIS_REGISTER_BX, UC_X86_REG_BX},
{ZYDIS_REGISTER_SP, UC_X86_REG_SP},
{ZYDIS_REGISTER_BP, UC_X86_REG_BP},
{ZYDIS_REGISTER_SI, UC_X86_REG_SI},
{ZYDIS_REGISTER_DI, UC_X86_REG_DI},
{ZYDIS_REGISTER_R8W, UC_X86_REG_R8W},
{ZYDIS_REGISTER_R9W, UC_X86_REG_R9W},
{ZYDIS_REGISTER_R10W, UC_X86_REG_R10W},
{ZYDIS_REGISTER_R11W, UC_X86_REG_R11W},
{ZYDIS_REGISTER_R12W, UC_X86_REG_R12W},
{ZYDIS_REGISTER_R13W, UC_X86_REG_R13W},
{ZYDIS_REGISTER_R14W, UC_X86_REG_R14W},
{ZYDIS_REGISTER_R15W, UC_X86_REG_R15W},
{ZYDIS_REGISTER_EAX, UC_X86_REG_EAX},
{ZYDIS_REGISTER_ECX, UC_X86_REG_ECX},
{ZYDIS_REGISTER_EDX, UC_X86_REG_EDX},
{ZYDIS_REGISTER_EBX, UC_X86_REG_EBX},
{ZYDIS_REGISTER_ESP, UC_X86_REG_ESP},
{ZYDIS_REGISTER_EBP, UC_X86_REG_EBP},
{ZYDIS_REGISTER_ESI, UC_X86_REG_ESI},
{ZYDIS_REGISTER_EDI, UC_X86_REG_EDI},
{ZYDIS_REGISTER_R8D, UC_X86_REG_R8D},
{ZYDIS_REGISTER_R9D, UC_X86_REG_R9D},
{ZYDIS_REGISTER_R10D, UC_X86_REG_R10D},
{ZYDIS_REGISTER_R11D, UC_X86_REG_R11D},
{ZYDIS_REGISTER_R12D, UC_X86_REG_R12D},
{ZYDIS_REGISTER_R13D, UC_X86_REG_R13D},
{ZYDIS_REGISTER_R14D, UC_X86_REG_R14D},
{ZYDIS_REGISTER_R15D, UC_X86_REG_R15D},
{ZYDIS_REGISTER_RAX, UC_X86_REG_RAX},
{ZYDIS_REGISTER_RCX, UC_X86_REG_RCX},
{ZYDIS_REGISTER_RDX, UC_X86_REG_RDX},
{ZYDIS_REGISTER_RBX, UC_X86_REG_RBX},
{ZYDIS_REGISTER_RSP, UC_X86_REG_RSP},
{ZYDIS_REGISTER_RBP, UC_X86_REG_RBP},
{ZYDIS_REGISTER_RSI, UC_X86_REG_RSI},
{ZYDIS_REGISTER_RDI, UC_X86_REG_RDI},
{ZYDIS_REGISTER_R8, UC_X86_REG_R8},
{ZYDIS_REGISTER_R9, UC_X86_REG_R9},
{ZYDIS_REGISTER_R10, UC_X86_REG_R10},
{ZYDIS_REGISTER_R11, UC_X86_REG_R11},
{ZYDIS_REGISTER_R12, UC_X86_REG_R12},
{ZYDIS_REGISTER_R13, UC_X86_REG_R13},
{ZYDIS_REGISTER_R14, UC_X86_REG_R14},
{ZYDIS_REGISTER_R15, UC_X86_REG_R15}};
/// <summary>
/// deadstore and opaque branch removal from unicorn engine trace... this is the

7
include/vmutils.hpp
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@ -68,6 +68,13 @@ inline bool open_binary_file(const std::string& file,
/// <returns></returns>
bool is_jmp(const zydis_decoded_instr_t& instr);
/// <summary>
/// used by profiles to see if an instruction is a MOV/SX/ZX...
/// </summary>
/// <param name="instr"></param>
/// <returns></returns>
bool is_mov(const zydis_decoded_instr_t& instr);
/// <summary>
/// prints a disassembly view of a routine...
/// </summary>

6
src/vmprofiles/jmp.cpp
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@ -123,6 +123,10 @@ profiler_t jmp = {
if (mov_reg_vsp != instrs.end())
vsp = mov_reg_vsp->m_instr.operands[0].reg.value;
}
return vinstr_t{mnemonic_t::jmp};
vinstr_t res;
memset(&res, NULL, sizeof vinstr_t);
res.mnemonic = mnemonic_t::jmp;
return res;
}};
}

86
src/vmprofiles/lconst.cpp
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@ -0,0 +1,86 @@
#include <vminstrs.hpp>
namespace vm::instrs {
profiler_t lconst = {
"LCONST",
mnemonic_t::lconst,
{{// MOV REG, [VIP]
[&](const zydis_reg_t vip,
const zydis_reg_t vsp,
const zydis_decoded_instr_t& instr) -> bool {
return vm::utils::is_mov(instr) &&
instr.operands[0].type == ZYDIS_OPERAND_TYPE_REGISTER &&
instr.operands[1].type == ZYDIS_OPERAND_TYPE_MEMORY &&
instr.operands[1].mem.base == vip;
},
// SUB VSP, OFFSET
[&](const zydis_reg_t vip,
const zydis_reg_t vsp,
const zydis_decoded_instr_t& instr) -> bool {
return instr.mnemonic == ZYDIS_MNEMONIC_SUB &&
instr.operands[0].type == ZYDIS_OPERAND_TYPE_REGISTER &&
instr.operands[0].reg.value == vsp &&
instr.operands[1].type == ZYDIS_OPERAND_TYPE_IMMEDIATE;
},
// MOV [VSP], REG
[&](const zydis_reg_t vip,
const zydis_reg_t vsp,
const zydis_decoded_instr_t& instr) -> bool {
return instr.mnemonic == ZYDIS_MNEMONIC_MOV &&
instr.operands[0].type == ZYDIS_OPERAND_TYPE_MEMORY &&
instr.operands[0].mem.base == vsp &&
instr.operands[1].type == ZYDIS_OPERAND_TYPE_REGISTER;
}}},
[&](zydis_reg_t& vip,
zydis_reg_t& vsp,
hndlr_trace_t& hndlr) -> std::optional<vinstr_t> {
vinstr_t res;
res.mnemonic = mnemonic_t::lconst;
res.imm.has_imm = true;
const auto sub_vsp = std::find_if(
hndlr.m_instrs.begin(), hndlr.m_instrs.end(),
[&](emu_instr_t& instr) -> bool {
const auto& i = instr.m_instr;
return i.mnemonic == ZYDIS_MNEMONIC_SUB &&
i.operands[0].type == ZYDIS_OPERAND_TYPE_REGISTER &&
i.operands[0].reg.value == vsp &&
i.operands[1].type == ZYDIS_OPERAND_TYPE_IMMEDIATE;
});
res.stack_size = sub_vsp->m_instr.operands[1].imm.value.u * 8;
const auto fetch_imm = std::find_if(
hndlr.m_instrs.begin(), hndlr.m_instrs.end(),
[&](emu_instr_t& instr) -> bool {
const auto& i = instr.m_instr;
return vm::utils::is_mov(i) &&
i.operands[0].type == ZYDIS_OPERAND_TYPE_REGISTER &&
i.operands[1].type == ZYDIS_OPERAND_TYPE_MEMORY &&
i.operands[1].mem.base == vip;
});
res.imm.size = fetch_imm->m_instr.operands[1].size;
const auto mov_vsp_imm = std::find_if(
hndlr.m_instrs.begin(), hndlr.m_instrs.end(),
[&](emu_instr_t& instr) -> bool {
const auto& i = instr.m_instr;
return i.mnemonic == ZYDIS_MNEMONIC_MOV &&
i.operands[0].type == ZYDIS_OPERAND_TYPE_MEMORY &&
i.operands[0].mem.base == vsp &&
i.operands[1].type == ZYDIS_OPERAND_TYPE_REGISTER;
});
uc_context* backup;
uc_context_alloc(hndlr.m_uc, &backup);
uc_context_save(hndlr.m_uc, backup);
uc_context_restore(hndlr.m_uc, mov_vsp_imm->m_cpu);
const uc_x86_reg imm_reg =
vm::instrs::reg_map[mov_vsp_imm->m_instr.operands[1].reg.value];
uc_reg_read(hndlr.m_uc, imm_reg, &res.imm.val);
uc_context_restore(hndlr.m_uc, backup);
uc_context_free(backup);
return res;
}};
}

89
src/vmprofiles/lreg.cpp
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@ -0,0 +1,89 @@
#include <vminstrs.hpp>
namespace vm::instrs {
profiler_t lreg = {
"LREG",
mnemonic_t::lreg,
{{// MOV REG, [VIP]
[&](const zydis_reg_t vip,
const zydis_reg_t vsp,
const zydis_decoded_instr_t& instr) -> bool {
return vm::utils::is_mov(instr) &&
instr.operands[0].type == ZYDIS_OPERAND_TYPE_REGISTER &&
instr.operands[1].type == ZYDIS_OPERAND_TYPE_MEMORY &&
instr.operands[1].mem.base == vip;
},
// MOV REG, [RSP+REG]
[&](const zydis_reg_t vip,
const zydis_reg_t vsp,
const zydis_decoded_instr_t& instr) -> bool {
return instr.mnemonic == ZYDIS_MNEMONIC_MOV &&
instr.operands[0].type == ZYDIS_OPERAND_TYPE_REGISTER &&
instr.operands[1].type == ZYDIS_OPERAND_TYPE_MEMORY &&
instr.operands[1].mem.base == ZYDIS_REGISTER_RSP &&
instr.operands[1].mem.index != ZYDIS_REGISTER_NONE;
},
// SUB VSP, OFFSET
[&](const zydis_reg_t vip,
const zydis_reg_t vsp,
const zydis_decoded_instr_t& instr) -> bool {
return instr.mnemonic == ZYDIS_MNEMONIC_SUB &&
instr.operands[0].type == ZYDIS_OPERAND_TYPE_REGISTER &&
instr.operands[0].reg.value == vsp &&
instr.operands[1].type == ZYDIS_OPERAND_TYPE_IMMEDIATE;
},
// MOV [VSP], REG
[&](const zydis_reg_t vip,
const zydis_reg_t vsp,
const zydis_decoded_instr_t& instr) -> bool {
return instr.mnemonic == ZYDIS_MNEMONIC_MOV &&
instr.operands[0].type == ZYDIS_OPERAND_TYPE_MEMORY &&
instr.operands[0].mem.base == vsp &&
instr.operands[1].type == ZYDIS_OPERAND_TYPE_REGISTER;
}}},
[&](zydis_reg_t& vip,
zydis_reg_t& vsp,
hndlr_trace_t& hndlr) -> std::optional<vinstr_t> {
vinstr_t res;
memset(&res, NULL, sizeof res);
res.mnemonic = mnemonic_t::lreg;
res.imm.has_imm = true;
res.imm.size = 8;
const auto sub_vsp = std::find_if(
hndlr.m_instrs.begin(), hndlr.m_instrs.end(),
[&](emu_instr_t& instr) -> bool {
const auto& i = instr.m_instr;
return i.mnemonic == ZYDIS_MNEMONIC_SUB &&
i.operands[0].type == ZYDIS_OPERAND_TYPE_REGISTER &&
i.operands[0].reg.value == vsp &&
i.operands[1].type == ZYDIS_OPERAND_TYPE_IMMEDIATE;
});
res.stack_size = sub_vsp->m_instr.operands[1].imm.value.u * 8;
// // MOV REG, [RSP+REG]... we want the register in [RSP+REG]...
const auto mov_reg_vreg = std::find_if(
hndlr.m_instrs.begin(), hndlr.m_instrs.end(),
[&](emu_instr_t& instr) -> bool {
const auto& i = instr.m_instr;
return i.mnemonic == ZYDIS_MNEMONIC_MOV &&
i.operands[0].type == ZYDIS_OPERAND_TYPE_REGISTER &&
i.operands[1].type == ZYDIS_OPERAND_TYPE_MEMORY &&
i.operands[1].mem.base == ZYDIS_REGISTER_RSP &&
i.operands[1].mem.index != ZYDIS_REGISTER_NONE;
});
uc_context* backup;
uc_context_alloc(hndlr.m_uc, &backup);
uc_context_save(hndlr.m_uc, backup);
uc_context_restore(hndlr.m_uc, mov_reg_vreg->m_cpu);
const uc_x86_reg idx_reg =
vm::instrs::reg_map[mov_reg_vreg->m_instr.operands[1].mem.index];
uc_reg_read(hndlr.m_uc, idx_reg, &res.imm.val);
uc_context_restore(hndlr.m_uc, backup);
uc_context_free(backup);
return res;
}};
}

23
src/vmprofiles/sreg.cpp
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@ -26,9 +26,7 @@ profiler_t sreg = {
[&](const zydis_reg_t vip,
const zydis_reg_t vsp,
const zydis_decoded_instr_t& instr) -> bool {
return (instr.mnemonic == ZYDIS_MNEMONIC_MOV ||
instr.mnemonic == ZYDIS_MNEMONIC_MOVSX ||
instr.mnemonic == ZYDIS_MNEMONIC_MOVZX) &&
return vm::utils::is_mov(instr) &&
instr.operands[0].type == ZYDIS_OPERAND_TYPE_REGISTER &&
instr.operands[1].type == ZYDIS_OPERAND_TYPE_MEMORY &&
instr.operands[1].mem.base == vip;
@ -47,9 +45,11 @@ profiler_t sreg = {
zydis_reg_t& vsp,
hndlr_trace_t& hndlr) -> std::optional<vinstr_t> {
vinstr_t res;
memset(&res, NULL, sizeof res);
res.mnemonic = mnemonic_t::sreg;
res.imm.has_imm = true;
res.imm.size = 8;
// locates ADD VSP, VALUE...
const auto add_vsp = std::find_if(
hndlr.m_instrs.begin(), hndlr.m_instrs.end(),
[&](emu_instr_t& instr) -> bool {
@ -60,9 +60,7 @@ profiler_t sreg = {
i.operands[1].type == ZYDIS_OPERAND_TYPE_IMMEDIATE;
});
res.size = add_vsp->m_instr.operands[1].imm.value.u * 8;
// MOV [RSP+REG], REG...
res.stack_size = add_vsp->m_instr.operands[1].imm.value.u * 8;
const auto mov_vreg_value = std::find_if(
hndlr.m_instrs.begin(), hndlr.m_instrs.end(),
[&](emu_instr_t& instr) -> bool {
@ -74,6 +72,17 @@ profiler_t sreg = {
i.operands[1].type == ZYDIS_OPERAND_TYPE_REGISTER;
});
uc_context* backup;
uc_context_alloc(hndlr.m_uc, &backup);
uc_context_save(hndlr.m_uc, backup);
uc_context_restore(hndlr.m_uc, mov_vreg_value->m_cpu);
const uc_x86_reg idx_reg =
vm::instrs::reg_map[mov_vreg_value->m_instr.operands[0].mem.index];
uc_reg_read(hndlr.m_uc, idx_reg, &res.imm.val);
uc_context_restore(hndlr.m_uc, backup);
uc_context_free(backup);
return res;
}};
}

6
src/vmutils.cpp
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@ -22,6 +22,12 @@ bool is_jmp(const zydis_decoded_instr_t& instr) {
instr.mnemonic <= ZYDIS_MNEMONIC_JZ;
}
bool is_mov(const zydis_decoded_instr_t& instr) {
return instr.mnemonic == ZYDIS_MNEMONIC_MOV ||
instr.mnemonic == ZYDIS_MNEMONIC_MOVSX ||
instr.mnemonic == ZYDIS_MNEMONIC_MOVZX;
}
bool flatten(zydis_rtn_t& routine,
std::uintptr_t routine_addr,
bool keep_jmps,

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