chuerk[.]zip | Triage

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General

Target

chuerk.zip
Size

78KB
MD5

95f1e8eaf180db589a1555b775a1c185
SHA1

c599cefe96e95091af6f4c72bdc643b76dc06cd7
SHA256

30ad97fc2756f22fe3cf59170e39b1e39b299ac827f6a8235231c2053d609a11
SHA512

3c4558df8360aaf7b588430d2d2afe61b9cb44c6251a779ed1523b8871ae9240e68d91f139aef4b785443d19d92ee7218b3891fda63cfac144d19b6cd4b1f86a
SSDEEP

1536:9sHFKKLd3IPTpfV0+fv8pef0+8zenbWf/6OsFiR61h98nb:6HFnePTs+ff0Nx/6OsFic1cnb

Score

3^/10

Malware Config

Signatures

Unsigned PE 2 IoCs

Checks for missing Authenticode signature.

resource
unpack001/netcoreapp3.1/chuerk.dll
unpack001/netcoreapp3.1/chuerk.exe

Files

chuerk.zip
.zip

Password: infected
netcoreapp3.1/chuerk.deps.json
netcoreapp3.1/chuerk.dll
.exe windows:4 windows x86 arch:x86

Password: infected

f34d5f2d4577ed6d9ceec516c1f5a744

Headers

DLL Characteristics

IMAGE_DLLCHARACTERISTICS_HIGH_ENTROPY_VA
IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE
IMAGE_DLLCHARACTERISTICS_NX_COMPAT
IMAGE_DLLCHARACTERISTICS_NO_SEH
IMAGE_DLLCHARACTERISTICS_TERMINAL_SERVER_AWARE

File Characteristics

IMAGE_FILE_EXECUTABLE_IMAGE
IMAGE_FILE_LARGE_ADDRESS_AWARE

PDB Paths

D:\chuerk\chuerk_gh\CHUERK\chuerk\obj\Debug\netcoreapp3.1\chuerk.pdb

Imports

mscoree

_CorExeMain

Sections

.text
Size: 5KB - Virtual size: 5KB

IMAGE_SCN_CNT_CODE
IMAGE_SCN_MEM_EXECUTE
IMAGE_SCN_MEM_READ

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

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

.reloc
Size: 512B - Virtual size: 12B

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ
netcoreapp3.1/chuerk.exe
.exe windows:6 windows x64 arch:x64

Password: infected

8541289ad805913417662883d15a837d

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\cli\apphost\Release\apphost.pdb

Imports

kernel32

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

user32

MessageBoxW

shell32

ShellExecuteW

advapi32

RegOpenKeyExW
RegCloseKey
ReportEventW
RegisterEventSourceW
DeregisterEventSource
RegGetValueW

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

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

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

fclose
__p__commode
__stdio_common_vsprintf_s
fread
fseek
fwrite
_set_fmode
__acrt_iob_func
fputwc
fputws
__stdio_common_vfwprintf
_wfopen
fflush
__stdio_common_vswprintf

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

wcsncmp
_wcsnicmp
_wcsdup
strcspn
strcpy_s
_wcsicmp
wcsnlen
memset

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

__setusermatherr
frexp

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

calloc
free
_callnewh
malloc
_set_new_mode

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

___mb_cur_max_func
setlocale
__pctype_func
___lc_codepage_func
_unlock_locales
_lock_locales
_configthreadlocale
___lc_locale_name_func
localeconv

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

_wrename
_wremove

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

wcstoul
_wtoi

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

wcsftime
_gmtime64
_time64

Sections

.text
Size: 99KB - Virtual size: 99KB

IMAGE_SCN_CNT_CODE
IMAGE_SCN_MEM_EXECUTE
IMAGE_SCN_MEM_READ

.rdata
Size: 42KB - Virtual size: 41KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

.data
Size: 3KB - Virtual size: 6KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
IMAGE_SCN_MEM_WRITE

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

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

_RDATA
Size: 512B - Virtual size: 172B

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

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

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

.reloc
Size: 1024B - Virtual size: 844B

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ
netcoreapp3.1/chuerk.pdb
netcoreapp3.1/chuerk.runtimeconfig.dev.json
netcoreapp3.1/chuerk.runtimeconfig.json

Sharing

General

Malware Config

Signatures

Files

Password: infected

Password: infected

f34d5f2d4577ed6d9ceec516c1f5a744

Headers

DLL Characteristics

File Characteristics

PDB Paths

Imports

mscoree

Sections

.text Size: 5KB - Virtual size: 5KB

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

.reloc Size: 512B - Virtual size: 12B

Password: infected

8541289ad805913417662883d15a837d

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-string-l1-1-0

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

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

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

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

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

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

Sections

.text Size: 99KB - Virtual size: 99KB

.rdata Size: 42KB - Virtual size: 41KB

.data Size: 3KB - Virtual size: 6KB

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

_RDATA Size: 512B - Virtual size: 172B

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

.reloc Size: 1024B - Virtual size: 844B

.text
Size: 5KB - Virtual size: 5KB

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

.reloc
Size: 512B - Virtual size: 12B

.text
Size: 99KB - Virtual size: 99KB

.rdata
Size: 42KB - Virtual size: 41KB

.data
Size: 3KB - Virtual size: 6KB

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

_RDATA
Size: 512B - Virtual size: 172B

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

.reloc
Size: 1024B - Virtual size: 844B