core[.]exe | Triage

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General

Target

core.exe
Size

17.7MB
MD5

5f90945f59adaca7aee52ade2821d8a6
SHA1

0272df263bbcdfd4e57beb7b98b5c262bf263be2
SHA256

2303f4a9ce5b9bdb97013f4b02c7ae9d60cbd205003df49ca2206a0fe8fc57ff
SHA512

c74a5493aaa20f3f338fcd06f887a7ccad63d1ea1759415b339f620c9a9772577aacd6478e0233a926b27d318a627799f1da13b6659f1783590b6fe4b80c0829
SSDEEP

196608:664qy8DqJZskgGhhD2wsL967OlREqSpAeNWGgFoxXX2Zv446Getl2Y0jZpFki28d:xYCk9D2f9EqSpFNPgF8n2ZwhTJ0jZpYE

Score

7^/10

Malware Config

Signatures

.NET Reactor proctector 1 IoCs

Detects an executable protected by an unregistered version of Eziriz's .NET Reactor.

resource	yara_rule
sample	net_reactor

Unsigned PE 1 IoCs

Checks for missing Authenticode signature.

resource
core.exe

Files

core.exe
.exe windows:6 windows x86 arch:x86

bad5d13eb315828b4ce3bfad7a8e6afd

Headers

DLL Characteristics

IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE
IMAGE_DLLCHARACTERISTICS_NX_COMPAT
IMAGE_DLLCHARACTERISTICS_GUARD_CF
IMAGE_DLLCHARACTERISTICS_TERMINAL_SERVER_AWARE

File Characteristics

IMAGE_FILE_EXECUTABLE_IMAGE
IMAGE_FILE_32BIT_MACHINE

PDB Paths

D:\a\_work\1\s\artifacts\obj\coreclr\windows.x86.Release\Corehost.Static\singlefilehost.pdb

Imports

kernel32

MultiByteToWideChar
GetTickCount
QueryPerformanceFrequency
QueryPerformanceCounter
GetModuleHandleW
FlushInstructionCache
InterlockedPushEntrySList
InterlockedFlushSList
InitializeSListHead
GetTickCount64
DuplicateHandle
QueueUserAPC
WaitForSingleObjectEx
SetThreadPriority
GetThreadPriority
ResumeThread
GetCurrentThreadId
Sleep
TlsAlloc
GetCurrentThread
CreateThread
WaitForMultipleObjectsEx
SignalObjectAndWait
SetThreadStackGuarantee
VirtualQuery
GetStdHandle
WideCharToMultiByte
GetConsoleOutputCP
MapViewOfFileEx
UnmapViewOfFile
GetStringTypeExW
SetEvent
GetCurrentProcessorNumber
GlobalMemoryStatusEx
CreateIoCompletionPort
PostQueuedCompletionStatus
SleepEx
GetQueuedCompletionStatus
InterlockedPopEntrySList
GetCurrentProcessorNumberEx
ExitProcess
CreateMemoryResourceNotification
GetProcessAffinityMask
SetThreadIdealProcessorEx
GetThreadIdealProcessorEx
GetLargePageMinimum
VirtualUnlock
ResetWriteWatch
GetWriteWatch
GetLogicalProcessorInformation
SetThreadGroupAffinity
SetThreadAffinityMask
IsProcessInJob
QueryInformationJobObject
K32GetProcessMemoryInfo
VirtualAlloc
VirtualFree
VirtualProtect
SwitchToThread
CloseThreadpoolTimer
CreateThreadpoolTimer
SetThreadpoolTimer
GetFileSize
GetEnvironmentVariableW
SetEnvironmentVariableW
CreateEventW
ResetEvent
CreateSemaphoreExW
ReleaseSemaphore
CreateMutexW
ReleaseMutex
GetThreadContext
SuspendThread
SetThreadContext
GetEnabledXStateFeatures
InitializeContext
CopyContext
SetXStateFeaturesMask
GetSystemDefaultLCID
GetUserDefaultLCID
OutputDebugStringA
RtlUnwind
HeapAlloc
HeapFree
GetProcessHeap
HeapCreate
HeapDestroy
GetEnvironmentStringsW
FreeEnvironmentStringsW
FormatMessageW
GetACP
LCMapStringEx
LocalFree
VerSetConditionMask
VerifyVersionInfoW
IsWow64Process
FindClose
GetEnvironmentVariableA
GetModuleFileNameW
FindNextFileW
QueryThreadCycleTime
VirtualAllocExNuma
GetNumaProcessorNodeEx
GetNumaHighestNodeNumber
GetSystemTimes
GetSystemTimeAsFileTime
CreateProcessW
GetCPInfo
LoadLibraryExW
CreateFileW
GetFileAttributesExW
GetTempPathW
GetCurrentDirectoryW
FindFirstFileExW
GetFullPathNameW
OpenProcess
LoadLibraryExA
OpenEventW
ExitThread
HeapReAlloc
CreateNamedPipeA
WaitForMultipleObjects
DisconnectNamedPipe
CreateFileA
CancelIoEx
GetOverlappedResult
ConnectNamedPipe
FlushFileBuffers
CreateFileMappingW
MapViewOfFile
GetActiveProcessorGroupCount
GetSystemTime
SetConsoleCtrlHandler
GetLocaleInfoEx
GetUserDefaultLocaleName
CreateDirectoryW
RemoveDirectoryW
GetFileSizeEx
LoadLibraryA
EncodePointer
DecodePointer
InitializeCriticalSectionAndSpinCount
AddVectoredExceptionHandler
SetUnhandledExceptionFilter
UnhandledExceptionFilter
TerminateProcess
GetCurrentProcessId
RaiseFailFastException
FreeLibrary
RaiseException
WaitForSingleObject
TlsSetValue
TlsGetValue
GetSystemInfo
ReadProcessMemory
IsDebuggerPresent
LeaveCriticalSection
EnterCriticalSection
DeleteCriticalSection
InitializeCriticalSection
WriteFile
GetProcessTimes
GetCommandLineW
ReadFile
SetFilePointer
GetProcAddress
GetModuleHandleExW
SetErrorMode
CloseHandle
GetCurrentProcess
FlushProcessWriteBuffers
SetLastError
GetLastError
OutputDebugStringW
DebugBreak
GetStringTypeW
IsProcessorFeaturePresent
TlsFree
InitializeConditionVariable
WakeConditionVariable
WakeAllConditionVariable
SleepConditionVariableCS
SleepConditionVariableSRW
InitializeSRWLock
ReleaseSRWLockExclusive
AcquireSRWLockExclusive
InitializeCriticalSectionEx
TryEnterCriticalSection
GetExitCodeThread
CreateFileMappingA

advapi32

RegGetValueW
SetKernelObjectSecurity
GetSidSubAuthorityCount
GetSidSubAuthority
GetTokenInformation
DeregisterEventSource
ReportEventW
RegisterEventSourceW
RegQueryValueExW
RegOpenKeyExW
RegCloseKey
EventRegister
AdjustTokenPrivileges
OpenProcessToken
LookupPrivilegeValueW
SetThreadToken
RevertToSelf
OpenThreadToken
EventWriteTransfer
EventWrite

ole32

CoCreateGuid
CoTaskMemAlloc
CoUninitialize
CoReleaseMarshalData
IIDFromString
CLSIDFromProgID
CoRegisterInitializeSpy
CoGetMarshalSizeMax
CoMarshalInterface
CoUnmarshalInterface
CoGetContextToken
CoGetClassObject
CoCreateFreeThreadedMarshaler
CreateStreamOnHGlobal
CoRevokeInitializeSpy
CoInitializeEx
CoWaitForMultipleHandles
StringFromGUID2
CoTaskMemFree
CoGetObjectContext

oleaut32

VarCyFromDec
SafeArrayAllocDescriptorEx
GetRecordInfoFromTypeInfo
SafeArraySetRecordInfo
SafeArrayAllocData
SafeArrayGetElemsize
SysStringByteLen
SysAllocStringByteLen
SafeArrayCreateVector
SafeArrayPutElement
LoadRegTypeLi
CreateErrorInfo
VariantInit
VariantChangeType
SafeArrayGetVartype
LoadTypeLibEx
QueryPathOfRegTypeLi
SafeArrayDestroy
SafeArrayGetLBound
SafeArrayGetDim
SysAllocStringLen
SysStringLen
SysAllocString
SetErrorInfo
GetErrorInfo
SysFreeString
VariantChangeTypeEx
VariantClear

user32

MessageBoxW
LoadStringW

shell32

ShellExecuteW

api-ms-win-crt-string-l1-1-0

strcpy_s
strncmp
wcsncpy_s
strlen
_strnicmp
strcmp
_wcsnicmp
wcscpy_s
wcsncmp
iswupper
towlower
isalpha
isdigit
wcstok_s
strnlen
_stricmp
isspace
_strdup
strncpy_s
isupper
strcspn
wcsnlen
_wcsdup
iswspace
strcat_s
_wcsicmp
islower
tolower
strncat_s
wcsncat_s
iswascii
__strncnt
towupper
wcscat_s
strtok_s

api-ms-win-crt-stdio-l1-1-0

__stdio_common_vswprintf_s
_set_fmode
__stdio_common_vsnprintf_s
fputws
_wfsopen
_get_stream_buffer_pointers
_putws
_fseeki64
__p__commode
_flushall
fread
fputwc
fsetpos
ungetc
__stdio_common_vfwprintf
fgetpos
fopen
fputs
setvbuf
__stdio_common_vfprintf
__stdio_common_vsnwprintf_s
__stdio_common_vsprintf_s
fgetc
__acrt_iob_func
fflush
fputc
__stdio_common_vswprintf
__stdio_common_vsscanf
fgets
_setmode
_dup
_fileno
ftell
fseek
fclose
_wfopen
fwrite

api-ms-win-crt-runtime-l1-1-0

_controlfp_s
_errno
_wcserror
_invalid_parameter_noinfo_noreturn
_beginthreadex
terminate
_register_thread_local_exe_atexit_callback
_c_exit
__p___wargv
__p___argc
_exit
_initterm_e
_initterm
abort
exit
_initialize_onexit_table
_register_onexit_function
_crt_atexit
_cexit
_seh_filter_exe
_set_app_type
_get_initial_wide_environment
_configure_wide_argv
_initialize_wide_environment
_invalid_parameter_noinfo

api-ms-win-crt-convert-l1-1-0

_ltow_s
atoi
_wtoi
strtoul
atol
wcstoul
strtoull
_itow_s
_wcstoui64

api-ms-win-crt-heap-l1-1-0

_set_new_mode
free
malloc
realloc
calloc

api-ms-win-crt-utility-l1-1-0

qsort

api-ms-win-crt-math-l1-1-0

_CIsinh
_CIfmod
_CIcosh
_CIatan2
__libm_sse2_acos
_libm_sse2_cos_precise
_libm_sse2_exp_precise
__libm_sse2_asin
_libm_sse2_atan_precise
__libm_sse2_atan
__libm_sse2_atan2
__libm_sse2_cos
_libm_sse2_acos_precise
log2
_copysign
__libm_sse2_log10
ilogb
cbrt
asinh
asinhf
ilogbf
atanhf
cbrtf
acoshf
log2f
modf
__libm_sse2_tan
_libm_sse2_asin_precise
_libm_sse2_log10_precise
_isnan
_libm_sse2_log_precise
_libm_sse2_pow_precise
_libm_sse2_sin_precise
_libm_sse2_sqrt_precise
_libm_sse2_tan_precise
_fdopen
__libm_sse2_sin
_CItanh
_finite
__libm_sse2_exp
ceil
__libm_sse2_pow
atanh
__libm_sse2_log
frexp
floor
fma
fmaf
acosh
__setusermatherr

api-ms-win-crt-time-l1-1-0

_time64
_gmtime64_s
wcsftime

api-ms-win-crt-locale-l1-1-0

localeconv
_lock_locales
_unlock_locales
_configthreadlocale
setlocale
__pctype_func
___lc_locale_name_func
___lc_codepage_func
___mb_cur_max_func

api-ms-win-crt-filesystem-l1-1-0

_wrename
_lock_file
_wremove
_unlock_file

Exports

Exports

CLRJitAttachState
DotNetRuntimeInfo
MetaDataGetDispenser
g_CLREngineMetrics

Sections

.text
Size: 5.3MB - Virtual size: 5.3MB

IMAGE_SCN_CNT_CODE
IMAGE_SCN_MEM_EXECUTE
IMAGE_SCN_MEM_READ

.CLR_UEF
Size: 512B - Virtual size: 68B

IMAGE_SCN_CNT_CODE
IMAGE_SCN_MEM_EXECUTE
IMAGE_SCN_MEM_READ

.rdata
Size: 1.2MB - Virtual size: 1.2MB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

.data
Size: 20KB - Virtual size: 72KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
IMAGE_SCN_MEM_WRITE

.didat
Size: 512B - Virtual size: 28B

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
IMAGE_SCN_MEM_WRITE

_RDATA
Size: 68KB - Virtual size: 67KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

.rsrc
Size: 1.5MB - Virtual size: 1.5MB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

.reloc
Size: 268KB - Virtual size: 268KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ

Sharing

General

Malware Config

Signatures

Files

bad5d13eb315828b4ce3bfad7a8e6afd

Headers

DLL Characteristics

File Characteristics

PDB Paths

Imports

kernel32

advapi32

ole32

oleaut32

user32

shell32

api-ms-win-crt-string-l1-1-0

api-ms-win-crt-stdio-l1-1-0

api-ms-win-crt-runtime-l1-1-0

api-ms-win-crt-convert-l1-1-0

api-ms-win-crt-heap-l1-1-0

api-ms-win-crt-utility-l1-1-0

api-ms-win-crt-math-l1-1-0

api-ms-win-crt-time-l1-1-0

api-ms-win-crt-locale-l1-1-0

api-ms-win-crt-filesystem-l1-1-0

Exports

Exports

Sections

.text Size: 5.3MB - Virtual size: 5.3MB

.CLR_UEF Size: 512B - Virtual size: 68B

.rdata Size: 1.2MB - Virtual size: 1.2MB

.data Size: 20KB - Virtual size: 72KB

.didat Size: 512B - Virtual size: 28B

_RDATA Size: 68KB - Virtual size: 67KB

.rsrc Size: 1.5MB - Virtual size: 1.5MB

.reloc Size: 268KB - Virtual size: 268KB

.text
Size: 5.3MB - Virtual size: 5.3MB

.CLR_UEF
Size: 512B - Virtual size: 68B

.rdata
Size: 1.2MB - Virtual size: 1.2MB

.data
Size: 20KB - Virtual size: 72KB

.didat
Size: 512B - Virtual size: 28B

_RDATA
Size: 68KB - Virtual size: 67KB

.rsrc
Size: 1.5MB - Virtual size: 1.5MB

.reloc
Size: 268KB - Virtual size: 268KB