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NVRAM boot manager check fix #607

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Merged
NotRequiem merged 1 commit into from
Jan 20, 2026
+0 −25
Merged

NVRAM boot manager check fix #607

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25 changes: 0 additions & 25 deletions src/vmaware.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -10171,31 +10171,6 @@ struct VM {
else if (var_name_view == L"KEKDefault") (void)read_variable_to_buffer(std::wstring(var_name_view), current_var->VendorGuid, kek_default_buf, kek_default_len);
else if (var_name_view == L"KEK") (void)read_variable_to_buffer(std::wstring(var_name_view), current_var->VendorGuid, kek_buf, kek_len);

if (var_name_view == L"Boot0000") { // should be Windows Boot Manager
BYTE* boot_buf = nullptr; SIZE_T boot_len = 0;
if (read_variable_to_buffer(var_name_view, current_var->VendorGuid, boot_buf, boot_len)) {
bool anomaly = (boot_len < 6);
if (!anomaly) {
unsigned short fpl_len = 0;
memcpy(&fpl_len, boot_buf + 4, sizeof(fpl_len));
// we could also check if loadOptionsLength is 136
if (fpl_len != 116) anomaly = true;
}

if (boot_buf) {
PVOID b_ptr = boot_buf; SIZE_T z_sz = 0;
nt_free_memory(current_process_handle, &b_ptr, &z_sz, 0x8000);
}

if (anomaly) {
debug("NVRAM: Environment was loaded using a virtual boot loader"); // "virtual" here -> non genuine
detection_result = true;
should_break_loop = true;
break;
}
}
}

if (current_var->NextEntryOffset == 0) break;
const SIZE_T next_entry_off = static_cast<SIZE_T>(current_var->NextEntryOffset);
const size_t next_var_offset = current_offset + next_entry_off;
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