dcrat | KOTON[.]exe

General

Target
KOTON.exe
Size 2.2MB
Sample260723-pk72macl4x
SHA256 e75b2167147b4f63599579aace6c19e7453624423a17fff91685cf87407b0b8a
MD5 910be11e662edbb98ddcaa39aa7a0d44
SHA1 43daab70edf61922ebb162d87539b5589c0dcbdc
SHA512 f9914b37044e7e3a8fdcdc046f5031ff3a58a629e4230ff0605df2e2fb4e122e4d4a590ccf44b90d120c51f4c03ce1ed03cec10328b5563098a4c1c181c801e9
SSDEEP 49152:4bA3z/sbluwkphmzJis2dpaBt1Ck9enztX65251vzz:4bgw5kpgqdMBuhzck5BX
TLSH
T118B5AE017E438911F0085333CAAFD524477CAE55E6B5EF1B79E93A6E6631B923C0C9CA
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

Codesign digest Mismatch 1 IoCs

File was altered after it was signed.

resource
KOTON.exe

File Explorer

KOTON.exe

.exe 2.2MB

KOTON.exe

IMPHASH fcf1390e9ce472c7270447fc5c61a0c1
SHA256 e75b2167147b4f63599579aace6c19e7453624423a17fff91685cf87407b0b8a
MD5 910be11e662edbb98ddcaa39aa7a0d44
SHA1 43daab70edf61922ebb162d87539b5589c0dcbdc
SHA512 f9914b37044e7e3a8fdcdc046f5031ff3a58a629e4230ff0605df2e2fb4e122e4d4a590ccf44b90d120c51f4c03ce1ed03cec10328b5563098a4c1c181c801e9
SSDEEP 49152:4bA3z/sbluwkphmzJis2dpaBt1Ck9enztX65251vzz:4bgw5kpgqdMBuhzck5BX
TLSH
T118B5AE017E438911F0085333CAAFD524477CAE55E6B5EF1B79E93A6E6631B923C0C9CA
MD5 SHA1 SHA512 SSDEEP TLSH

windows:5 windows x86 arch:x86

DCRat payload

Detects payload of DCRat, commonly dropped by NSIS installers.

rat
Codesign digest Mismatch

File was altered after it was signed.

PE Signature issue

Digest

e1:d3:16:6c:5b:ba:c8:5e:75:d6:b5:e5:66:0c:79:33:52:27:82:84:ba:40:ad:55:dd:b9:b8:72:60:00:ce:89

Digest Algorithm

sha256

PE Digests Matches

Not matched

Trusted

Signing Certificate

CN=AVG Technologies USA\, LLC,OU=RE stapler cistodc,O=AVG Technologies USA\, LLC,L=Newton,ST=North Carolina,C=US

Chains

Jan 5, 2022

CN=AVG Technologies USA\, LLC,OU=RE stapler cistodc,O=AVG Technologies USA\, LLC,L=Newton,ST=North Carolina,C=US

CN=DigiCert SHA2 Assured ID Code Signing CA,OU=www.digicert.com,O=DigiCert Inc,C=US

CN=DigiCert Assured ID Root CA,OU=www.digicert.com,O=DigiCert Inc,C=US

Subject

CN=DigiCert SHA2 Assured ID Code Signing CA,OU=www.digicert.com,O=DigiCert Inc,C=US

Serial Number

04:09:18:1b:5f:d5:bb:66:75:53:43:b5:6f:95:50:08

Issuer

CN=DigiCert Assured ID Root CA,OU=www.digicert.com,O=DigiCert Inc,C=US

Key Usages

KeyUsageDigitalSignature, KeyUsageCertSign, KeyUsageCRLSign

Ext Key Usages

ExtKeyUsageCodeSigning

Revocation Status

Not revoked

Timespan

Oct 22, 2013 - Oct 22, 2028

Subject

CN=AVG Technologies USA\, LLC,OU=RE stapler cistodc,O=AVG Technologies USA\, LLC,L=Newton,ST=North Carolina,C=US

Serial Number

0e:31:e4:8d:08:06:5b:09:8f:84:e7:c5:10:33:60:74

Issuer

CN=DigiCert SHA2 Assured ID Code Signing CA,OU=www.digicert.com,O=DigiCert Inc,C=US

Key Usages

KeyUsageDigitalSignature

Ext Key Usages

ExtKeyUsageCodeSigning

Revocation Status

Not revoked

Timespan

Mar 6, 2020 - Mar 15, 2023

Subject

CN=DigiCert Timestamp 2021,O=DigiCert\, Inc.,C=US

Serial Number

0d:42:4a:e0:be:3a:88:ff:60:40:21:ce:14:00:f0:dd

Issuer

CN=DigiCert SHA2 Assured ID Timestamping CA,OU=www.digicert.com,O=DigiCert Inc,C=US

Key Usages

KeyUsageDigitalSignature

Ext Key Usages

ExtKeyUsageTimeStamping

Revocation Status

Not revoked

Timespan

Jan 1, 2021 - Jan 6, 2031

Subject

CN=DigiCert SHA2 Assured ID Timestamping CA,OU=www.digicert.com,O=DigiCert Inc,C=US

Serial Number

0a:a1:25:d6:d6:32:1b:7e:41:e4:05:da:36:97:c2:15

Issuer

CN=DigiCert Assured ID Root CA,OU=www.digicert.com,O=DigiCert Inc,C=US

Key Usages

KeyUsageDigitalSignature, KeyUsageCertSign, KeyUsageCRLSign

Ext Key Usages

ExtKeyUsageTimeStamping

Revocation Status

Not revoked

Timespan

Jan 7, 2016 - Jan 7, 2031

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

84KB

Virtual Size

84KB

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

KOTON.exe

PE Signature issue

kernel32

gdiplus

generic