Static task
static1
Behavioral task
behavioral1
Sample
koyuki.exe
Resource
win11-20231215-en
General
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Target
koyuki.exe
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Size
2.5MB
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MD5
8db7994a7daecb610dd70ea225708476
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SHA1
eab48cbb61b631200d8f1e99c9951ec68e53480c
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SHA256
a5376fa272f4a22a836b96dcb4bbb25d20f145e6d8e4ad4c1a059bf13c78c4c9
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SHA512
e31bb502ca47eef49f19f9dfc81107e1659eefec2ca7abd6fef767d572625ae2ac088726a2dc8cabdb6b3bc6499e700f081fa0e8dd42aeec1fdcf55942966bdb
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SSDEEP
49152:2Gw5Sredj83O13OOCteYg+bXJheD1pm5RG1CmV8K4BPdumOysQIW/1ZFX:OdQ3O1fm/kfCPwyLI27
Malware Config
Signatures
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Unsigned PE 1 IoCs
Checks for missing Authenticode signature.
resource koyuki.exe
Files
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koyuki.exe.exe windows:6 windows x64 arch:x64
f0ea7b7844bbc5bfa9bb32efdcea957c
Headers
DLL Characteristics
IMAGE_DLLCHARACTERISTICS_HIGH_ENTROPY_VA
IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE
IMAGE_DLLCHARACTERISTICS_NX_COMPAT
IMAGE_DLLCHARACTERISTICS_TERMINAL_SERVER_AWARE
File Characteristics
IMAGE_FILE_EXECUTABLE_IMAGE
IMAGE_FILE_LARGE_ADDRESS_AWARE
IMAGE_FILE_DEBUG_STRIPPED
Imports
kernel32
WriteFile
WriteConsoleW
WaitForMultipleObjects
WaitForSingleObject
VirtualQuery
VirtualFree
VirtualAlloc
TlsAlloc
SwitchToThread
SuspendThread
SetWaitableTimer
SetUnhandledExceptionFilter
SetProcessPriorityBoost
SetEvent
SetErrorMode
SetConsoleCtrlHandler
ResumeThread
PostQueuedCompletionStatus
LoadLibraryA
LoadLibraryW
SetThreadContext
GetThreadContext
GetSystemInfo
GetSystemDirectoryA
GetStdHandle
GetQueuedCompletionStatusEx
GetProcessAffinityMask
GetProcAddress
GetEnvironmentStringsW
GetConsoleMode
FreeEnvironmentStringsW
ExitProcess
DuplicateHandle
CreateWaitableTimerExW
CreateThread
CreateIoCompletionPort
CreateFileA
CreateEventA
CloseHandle
AddVectoredExceptionHandler
Sections
.text Size: 687KB - Virtual size: 686KB
IMAGE_SCN_CNT_CODE
IMAGE_SCN_MEM_EXECUTE
IMAGE_SCN_MEM_READ
.rdata Size: 750KB - Virtual size: 749KB
IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
.data Size: 254KB - Virtual size: 609KB
IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
IMAGE_SCN_MEM_WRITE
/4 Size: 512B - Virtual size: 295B
IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ
/19 Size: 137KB - Virtual size: 137KB
IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ
/32 Size: 25KB - Virtual size: 25KB
IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ
/46 Size: 512B - Virtual size: 48B
IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ
/65 Size: 401KB - Virtual size: 400KB
IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ
/78 Size: 139KB - Virtual size: 138KB
IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ
/90 Size: 42KB - Virtual size: 42KB
IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ
.idata Size: 1KB - Virtual size: 1KB
IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
IMAGE_SCN_MEM_WRITE
.reloc Size: 13KB - Virtual size: 12KB
IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ
.symtab Size: 138KB - Virtual size: 138KB
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ