mbr[.]exe | Triage

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General

Target

mbr.exe
Size

2.6MB
MD5

538a6599bd091057226a7631099104eb
SHA1

72e523f5df91fadce5eb71cf127a26d636656fc9
SHA256

8f474b97705193ae5075574a000c1f6181725c495da858479321a65a601523d2
SHA512

6a5170cae1df229220a141f0219e7a8087db01a7b87e82d4ae51860403d504df473cf9ca8380dbf1d765e0fe1956d31a4ae644f75c8f21d5bb4726f9faf37d89
SSDEEP

49152:DrodCdXM8jfXpyHA/y1+mwN2yQl/qDeYgUcO:D0dyjfXpyHAwl/qDeYgUcO

Score

3^/10

Malware Config

Signatures

Unsigned PE 1 IoCs

Checks for missing Authenticode signature.

resource
mbr.exe

Files

mbr.exe
.exe windows:4 windows x64 arch:x64

638c3c1c8c8489299f9c8536ba1a2942

Headers

DLL Characteristics

IMAGE_DLLCHARACTERISTICS_HIGH_ENTROPY_VA
IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE
IMAGE_DLLCHARACTERISTICS_NX_COMPAT

File Characteristics

IMAGE_FILE_EXECUTABLE_IMAGE
IMAGE_FILE_LINE_NUMS_STRIPPED
IMAGE_FILE_LARGE_ADDRESS_AWARE

Imports

kernel32

CloseHandle
CreateEventA
CreateSemaphoreA
DeleteCriticalSection
DuplicateHandle
EnterCriticalSection
FormatMessageA
GetCurrentProcess
GetCurrentProcessId
GetCurrentThread
GetCurrentThreadId
GetHandleInformation
GetLastError
GetModuleHandleA
GetProcAddress
GetProcessAffinityMask
GetSystemTimeAsFileTime
GetThreadContext
GetThreadPriority
GetTickCount
InitializeCriticalSection
IsDebuggerPresent
IsProcessorFeaturePresent
LeaveCriticalSection
LocalFree
MultiByteToWideChar
OpenProcess
OutputDebugStringA
QueryPerformanceCounter
QueryPerformanceFrequency
RaiseException
ReleaseSemaphore
ResetEvent
ResumeThread
RtlCaptureContext
RtlLookupFunctionEntry
RtlUnwindEx
RtlVirtualUnwind
SetEvent
SetLastError
SetProcessAffinityMask
SetThreadContext
SetThreadPriority
SetUnhandledExceptionFilter
Sleep
SuspendThread
TerminateProcess
TlsAlloc
TlsGetValue
TlsSetValue
TryEnterCriticalSection
VirtualProtect
VirtualQuery
WaitForMultipleObjects
WaitForSingleObject
WideCharToMultiByte

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

mbrtowc
strtoul
wcrtomb

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

__p__environ
__p__wenviron
getenv

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

_fstat64

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

_set_new_mode
calloc
free
malloc
realloc

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

___lc_codepage_func
___mb_cur_max_func
localeconv
setlocale

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

__setusermatherr
_fdopen

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

__C_specific_handler
__intrinsic_setjmpex
longjmp
memchr
memcmp
memcpy
memmove
strchr

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

__p___argc
__p___argv
__p___wargv
_beginthreadex
_cexit
_configure_narrow_argv
_configure_wide_argv
_crt_at_quick_exit
_crt_atexit
_endthreadex
_errno
_exit
_initialize_narrow_environment
_initialize_wide_environment
_initterm
_set_app_type
_set_invalid_parameter_handler
abort
exit
signal
strerror

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

__acrt_iob_func
__p__commode
__p__fmode
__stdio_common_vfprintf
__stdio_common_vfwprintf
__stdio_common_vsprintf
_fileno
_fseeki64
_ftelli64
_lseeki64
_read
_wfopen
_write
fclose
fflush
fopen
fputc
fputs
fread
fwrite
getc
getwc
putc
putwc
setvbuf
ungetc
ungetwc

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

_strdup
iswctype
memset
strcmp
strcoll
strlen
strncmp
strxfrm
towlower
towupper
wcscoll
wcslen
wcsxfrm

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

__daylight
__timezone
__tzname
_tzset
strftime
wcsftime

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

rand_s

Sections

.text
Size: 731KB - Virtual size: 731KB

IMAGE_SCN_CNT_CODE
IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_EXECUTE
IMAGE_SCN_MEM_READ

.data
Size: 12KB - Virtual size: 12KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
IMAGE_SCN_MEM_WRITE

.rdata
Size: 70KB - Virtual size: 69KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

.pdata
Size: 45KB - Virtual size: 45KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

.xdata
Size: 62KB - Virtual size: 61KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

.bss
Size: - Virtual size: 3KB

IMAGE_SCN_CNT_UNINITIALIZED_DATA
IMAGE_SCN_MEM_READ
IMAGE_SCN_MEM_WRITE

.idata
Size: 6KB - Virtual size: 6KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
IMAGE_SCN_MEM_WRITE

.CRT
Size: 512B - Virtual size: 104B

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
IMAGE_SCN_MEM_WRITE

.tls
Size: 512B - Virtual size: 16B

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
IMAGE_SCN_MEM_WRITE

.rsrc
Size: 1KB - Virtual size: 1KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

.reloc
Size: 6KB - Virtual size: 5KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ

/4
Size: 2KB - Virtual size: 2KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ

/19
Size: 99KB - Virtual size: 98KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ

/31
Size: 19KB - Virtual size: 18KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ

/45
Size: 41KB - Virtual size: 40KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ

/57
Size: 7KB - Virtual size: 7KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ

/70
Size: 1024B - Virtual size: 960B

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ

/81
Size: 12KB - Virtual size: 11KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ

/97
Size: 49KB - Virtual size: 49KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ

/113
Size: 1KB - Virtual size: 1KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ

Sharing

General

Malware Config

Signatures

Files

638c3c1c8c8489299f9c8536ba1a2942

Headers

DLL Characteristics

File Characteristics

Imports

kernel32

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

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

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

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

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

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

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

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

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

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

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

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

Sections

.text Size: 731KB - Virtual size: 731KB

.data Size: 12KB - Virtual size: 12KB

.rdata Size: 70KB - Virtual size: 69KB

.pdata Size: 45KB - Virtual size: 45KB

.xdata Size: 62KB - Virtual size: 61KB

.bss Size: - Virtual size: 3KB

.idata Size: 6KB - Virtual size: 6KB

.CRT Size: 512B - Virtual size: 104B

.tls Size: 512B - Virtual size: 16B

.rsrc Size: 1KB - Virtual size: 1KB

.reloc Size: 6KB - Virtual size: 5KB

/4 Size: 2KB - Virtual size: 2KB

/19 Size: 99KB - Virtual size: 98KB

/31 Size: 19KB - Virtual size: 18KB

/45 Size: 41KB - Virtual size: 40KB

/57 Size: 7KB - Virtual size: 7KB

/70 Size: 1024B - Virtual size: 960B

/81 Size: 12KB - Virtual size: 11KB

/97 Size: 49KB - Virtual size: 49KB

/113 Size: 1KB - Virtual size: 1KB

.text
Size: 731KB - Virtual size: 731KB

.data
Size: 12KB - Virtual size: 12KB

.rdata
Size: 70KB - Virtual size: 69KB

.pdata
Size: 45KB - Virtual size: 45KB

.xdata
Size: 62KB - Virtual size: 61KB

.bss
Size: - Virtual size: 3KB

.idata
Size: 6KB - Virtual size: 6KB

.CRT
Size: 512B - Virtual size: 104B

.tls
Size: 512B - Virtual size: 16B

.rsrc
Size: 1KB - Virtual size: 1KB

.reloc
Size: 6KB - Virtual size: 5KB

/4
Size: 2KB - Virtual size: 2KB

/19
Size: 99KB - Virtual size: 98KB

/31
Size: 19KB - Virtual size: 18KB

/45
Size: 41KB - Virtual size: 40KB

/57
Size: 7KB - Virtual size: 7KB

/70
Size: 1024B - Virtual size: 960B

/81
Size: 12KB - Virtual size: 11KB

/97
Size: 49KB - Virtual size: 49KB

/113
Size: 1KB - Virtual size: 1KB