Bootstrapper[.]rar

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General

Target

Bootstrapper.rar
Size

508KB
MD5

a4b27d5be7df2d677e0f82138f374cdb
SHA1

3d48055c1ab1c4b3e5326c8ee0576e6708ba3a8a
SHA256

6f98d87976c45a507dd0d630012d5e4c89cb01fe69edf6196704e0c3959c165d
SHA512

2febe64e3e7d3a0f4342bfa5f02779f2b7986846979cc57a3969358ed24f2f722389727e25a0c47fe5488c09c25d2a92e43ff9ee387b44b9ef2adfe161d381a5
SSDEEP

12288:kvSw5jGJxf5I4G8flSQlUNrqlAykgS74XMqgl6y:kvSwMJxf5RG8f/l0qlWx74XBy

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
static1/unpack001/Bootstrapper.exe	net_reactor

Unsigned PE 1 IoCs

Checks for missing Authenticode signature.

resource
unpack001/Bootstrapper.exe

Files

Bootstrapper.rar
.rar
Bootstrapper.exe
.exe windows:6 windows x64 arch:x64

6a91eb82bfd19d2706c7d43c46f7064e

Headers

DLL Characteristics

IMAGE_DLLCHARACTERISTICS_HIGH_ENTROPY_VA
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_LARGE_ADDRESS_AWARE

PDB Paths

D:\a\_work\1\s\artifacts\obj\win-x64.Release\corehost\apphost\standalone\apphost.pdb

Imports

kernel32

FreeLibrary
LoadLibraryExW
OutputDebugStringW
FindFirstFileExW
EnterCriticalSection
GetFullPathNameW
FindNextFileW
GetCurrentProcess
GetModuleHandleExW
GetModuleFileNameW
LeaveCriticalSection
GetEnvironmentVariableW
GetModuleHandleW
MultiByteToWideChar
GetFileAttributesExW
LoadLibraryA
DeleteCriticalSection
WideCharToMultiByte
IsWow64Process
TlsFree
TlsSetValue
TlsGetValue
TlsAlloc
InitializeCriticalSectionAndSpinCount
GetProcAddress
GetWindowsDirectoryW
FindResourceW
GetLastError
ActivateActCtx
FindClose
CreateActCtxW
SetLastError
RaiseException
RtlPcToFileHeader
RtlUnwindEx
InitializeSListHead
GetCurrentProcessId
IsDebuggerPresent
IsProcessorFeaturePresent
TerminateProcess
SetUnhandledExceptionFilter
UnhandledExceptionFilter
RtlVirtualUnwind
RtlLookupFunctionEntry
RtlCaptureContext
GetStringTypeW
SwitchToThread
GetCurrentThreadId
InitializeCriticalSectionEx
EncodePointer
DecodePointer
LCMapStringEx
QueryPerformanceCounter
GetSystemTimeAsFileTime

user32

MessageBoxW

shell32

ShellExecuteW

advapi32

RegOpenKeyExW
RegGetValueW
DeregisterEventSource
RegisterEventSourceW
ReportEventW
RegCloseKey

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

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

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

__acrt_iob_func
fputwc
__p__commode
_set_fmode
fputws
_wfsopen
fflush
__stdio_common_vfwprintf
__stdio_common_vsnwprintf_s
__stdio_common_vswprintf
setvbuf

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

calloc
_set_new_mode
free
_callnewh
malloc

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

toupper
_wcsdup
wcsncmp
wcsnlen
strcpy_s

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

wcstoul
_wtoi

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

_gmtime64_s
_time64
wcsftime

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

setlocale
___mb_cur_max_func
_configthreadlocale
___lc_codepage_func
___lc_locale_name_func
__pctype_func
_lock_locales
_unlock_locales

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

__setusermatherr

Sections

.text
Size: 90KB - Virtual size: 90KB

IMAGE_SCN_CNT_CODE
IMAGE_SCN_MEM_EXECUTE
IMAGE_SCN_MEM_READ

.rdata
Size: 37KB - Virtual size: 37KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

.data
Size: 2KB - Virtual size: 6KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
IMAGE_SCN_MEM_WRITE

.pdata
Size: 5KB - Virtual size: 4KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

_RDATA
Size: 512B - Virtual size: 500B

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

.reloc
Size: 1024B - Virtual size: 792B

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ

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

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

Sharing

General

Malware Config

Signatures

Files

6a91eb82bfd19d2706c7d43c46f7064e

Headers

DLL Characteristics

File Characteristics

PDB Paths

Imports

kernel32

user32

shell32

advapi32

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

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

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

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

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

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

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

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

Sections

.text Size: 90KB - Virtual size: 90KB

.rdata Size: 37KB - Virtual size: 37KB

.data Size: 2KB - Virtual size: 6KB

.pdata Size: 5KB - Virtual size: 4KB

_RDATA Size: 512B - Virtual size: 500B

.reloc Size: 1024B - Virtual size: 792B

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

.text
Size: 90KB - Virtual size: 90KB

.rdata
Size: 37KB - Virtual size: 37KB

.data
Size: 2KB - Virtual size: 6KB

.pdata
Size: 5KB - Virtual size: 4KB

_RDATA
Size: 512B - Virtual size: 500B

.reloc
Size: 1024B - Virtual size: 792B

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