dcrat | DCRatBuild[.]exe

General

Target
DCRatBuild.exe
Size 3.0MB
Sample260718-aej1aady2y
SHA256 9e8670e7ae7b4176972f239e0ae129f4d4d1ec9f74bfd8c1e5829db34eaa7998
MD5 6313d83667d80833faef41a8cd004fe4
SHA1 856eb5de94823305837c3c7c9c563fbcddc4f25e
SHA512 8b39f19ea7521dd698cfe56cd2f78ccd596a774c3314f20680c87a906e8fbb59c5739bd2a52ee7379ee44b92b7c8bada9f483cfc36e111910c2244811de4d0f8
SSDEEP 49152:ubA3jcYWPh3V0cH0kRHPcEsz/gw3inptdNuW9xLWiYkIX+RPKYwwMz8:ubtTV8APRg/byptdPWcIORPZwX8
TLSH
T103E5D0017E41CA11F4190633C2EF865447B5AD116AE2F72BBABD336D95223937C1EACB
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

rat infostealer dcrat

Malware Config

Signatures

Family: DcRat
DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.
rat infostealer dcrat

DCRat payload 1 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
sample	dcrat

Unsigned PE 1 IoCs

Checks for missing Authenticode signature.

resource
DCRatBuild.exe

File Explorer

DCRatBuild.exe

.exe 3.0MB

DCRatBuild.exe

IMPHASH fcf1390e9ce472c7270447fc5c61a0c1
SHA256 9e8670e7ae7b4176972f239e0ae129f4d4d1ec9f74bfd8c1e5829db34eaa7998
MD5 6313d83667d80833faef41a8cd004fe4
SHA1 856eb5de94823305837c3c7c9c563fbcddc4f25e
SHA512 8b39f19ea7521dd698cfe56cd2f78ccd596a774c3314f20680c87a906e8fbb59c5739bd2a52ee7379ee44b92b7c8bada9f483cfc36e111910c2244811de4d0f8
SSDEEP 49152:ubA3jcYWPh3V0cH0kRHPcEsz/gw3inptdNuW9xLWiYkIX+RPKYwwMz8:ubtTV8APRg/byptdPWcIORPZwX8
TLSH
T103E5D0017E41CA11F4190633C2EF865447B5AD116AE2F72BBABD336D95223937C1EACB
MD5 SHA1 SHA512 SSDEEP TLSH

windows:5 windows x86 arch:x86

DCRat payload

Detects payload of DCRat, commonly dropped by NSIS installers.

rat
Unsigned PE

Checks for missing Authenticode signature.

Minor OS version

1

Major OS version

5

Entry point

126016

Magic Number

267

Subsystem

IMAGE_SUBSYSTEM_WINDOWS_GUI

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:\Projects\WinRAR\sfx\build\sfxrar32\Release\sfxrar.pdb

kernel32

GetLastError SetLastError FormatMessageW GetCurrentProcess DeviceIoControl SetFileTime CloseHandle CreateDirectoryW RemoveDirectoryW CreateFileW DeleteFileW CreateHardLinkW GetShortPathNameW GetLongPathNameW MoveFileW GetFileType GetStdHandle WriteFile ReadFile FlushFileBuffers SetEndOfFile SetFilePointer SetFileAttributesW GetFileAttributesW FindClose FindFirstFileW FindNextFileW GetVersionExW GetCurrentDirectoryW GetFullPathNameW FoldStringW GetModuleFileNameW GetModuleHandleW FindResourceW FreeLibrary GetProcAddress GetCurrentProcessId ExitProcess SetThreadExecutionState Sleep LoadLibraryW GetSystemDirectoryW CompareStringW AllocConsole FreeConsole AttachConsole WriteConsoleW GetProcessAffinityMask CreateThread SetThreadPriority InitializeCriticalSection EnterCriticalSection LeaveCriticalSection DeleteCriticalSection SetEvent ResetEvent ReleaseSemaphore WaitForSingleObject CreateEventW CreateSemaphoreW GetSystemTime SystemTimeToTzSpecificLocalTime TzSpecificLocalTimeToSystemTime SystemTimeToFileTime FileTimeToLocalFileTime LocalFileTimeToFileTime FileTimeToSystemTime GetCPInfo IsDBCSLeadByte MultiByteToWideChar WideCharToMultiByte GlobalAlloc LockResource GlobalLock GlobalUnlock GlobalFree LoadResource SizeofResource SetCurrentDirectoryW GetExitCodeProcess GetLocalTime GetTickCount MapViewOfFile UnmapViewOfFile CreateFileMappingW OpenFileMappingW GetCommandLineW SetEnvironmentVariableW ExpandEnvironmentStringsW GetTempPathW MoveFileExW GetLocaleInfoW GetTimeFormatW GetDateFormatW GetNumberFormatW SetFilePointerEx GetConsoleMode GetConsoleCP HeapSize SetStdHandle GetProcessHeap RaiseException GetSystemInfo VirtualProtect VirtualQuery LoadLibraryExA IsProcessorFeaturePresent IsDebuggerPresent UnhandledExceptionFilter SetUnhandledExceptionFilter GetStartupInfoW QueryPerformanceCounter GetCurrentThreadId GetSystemTimeAsFileTime InitializeSListHead TerminateProcess RtlUnwind EncodePointer InitializeCriticalSectionAndSpinCount TlsAlloc TlsGetValue TlsSetValue TlsFree LoadLibraryExW QueryPerformanceFrequency GetModuleHandleExW GetModuleFileNameA GetACP HeapFree HeapAlloc HeapReAlloc GetStringTypeW LCMapStringW FindFirstFileExA FindNextFileA IsValidCodePage GetOEMCP GetCommandLineA GetEnvironmentStringsW FreeEnvironmentStringsW DecodePointer

gdiplus

GdiplusShutdown GdiplusStartup GdipCreateHBITMAPFromBitmap GdipCreateBitmapFromStreamICM GdipCreateBitmapFromStream GdipDisposeImage GdipCloneImage GdipFree GdipAlloc

Name

.text

Size

196KB

Virtual Size

196KB

Characteristics

IMAGE_SCN_CNT_CODE IMAGE_SCN_MEM_EXECUTE IMAGE_SCN_MEM_READ

Name

.rdata

Size

42KB

Virtual Size

41KB

Characteristics

IMAGE_SCN_CNT_INITIALIZED_DATA IMAGE_SCN_MEM_READ

Name

.data

Size

4KB

Virtual Size

141KB

Characteristics

IMAGE_SCN_CNT_INITIALIZED_DATA IMAGE_SCN_MEM_READ IMAGE_SCN_MEM_WRITE

Name

.didat

Size

512B

Virtual Size

392B

Characteristics

IMAGE_SCN_CNT_INITIALIZED_DATA IMAGE_SCN_MEM_READ IMAGE_SCN_MEM_WRITE

Name

.rsrc

Size

56KB

Virtual Size

55KB

Characteristics

IMAGE_SCN_CNT_INITIALIZED_DATA IMAGE_SCN_MEM_READ

Name

.reloc

Size

9KB

Virtual Size

8KB

Characteristics

IMAGE_SCN_CNT_INITIALIZED_DATA IMAGE_SCN_MEM_DISCARDABLE IMAGE_SCN_MEM_READ

Sharing

General

Malware Config

Signatures

File Explorer

DCRatBuild.exe

kernel32

gdiplus

generic