msu[.]exe | Triage™

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General

Target
msu.exe
Size 700KB
Sample261017-knpx1acy21
SHA256 9208cec87a55a92926e2b5f3b82c064faada20f98c20729fac0943e6b9400bf2
MD5 1527e8e3a348b129d449816dd3c9bad0
SHA1 87305d7cfb5bbac4838dd8ff0308063ce0fed53c
SHA512 15996c1294ce8689a80768ccf26fc10cebdc5025167d7cc69ab9fee1e3a483da02f575b7d894999488022c6c3c7bd6028f9f2bb6bf3f632057491626f9b0a23b
SSDEEP 12288:HLRt2wOmuaaa1g4BifQkHR7hUK716udAQp4340PPgTIpx48nRdc6D:v2xyZ4QkxXfOE434TwnI6D
TLSH
T14BE4CF0BF60365BAC66722B100DFE27BA2305B094413DD6FDBDA5D79F72F710282961A
MD5 SHA1 SHA512 SSDEEP TLSH

Score

3^/10

Malware Config

Signatures

Unsigned PE 1 IoCs

Checks for missing Authenticode signature.

resource
msu.exe

File Explorer

msu.exe

.exe 700KB

msu.exe

IMPHASH ef24209471d48634d71aafa5a9300a9a
SHA256 9208cec87a55a92926e2b5f3b82c064faada20f98c20729fac0943e6b9400bf2
MD5 1527e8e3a348b129d449816dd3c9bad0
SHA1 87305d7cfb5bbac4838dd8ff0308063ce0fed53c
SHA512 15996c1294ce8689a80768ccf26fc10cebdc5025167d7cc69ab9fee1e3a483da02f575b7d894999488022c6c3c7bd6028f9f2bb6bf3f632057491626f9b0a23b
SSDEEP 12288:HLRt2wOmuaaa1g4BifQkHR7hUK716udAQp4340PPgTIpx48nRdc6D:v2xyZ4QkxXfOE434TwnI6D
TLSH
T14BE4CF0BF60365BAC66722B100DFE27BA2305B094413DD6FDBDA5D79F72F710282961A
MD5 SHA1 SHA512 SSDEEP TLSH

windows:6 windows x86 arch:x86

Unsigned PE

Checks for missing Authenticode signature.

Minor OS version

Major OS version

Entry point

4282

Magic Number

267

Subsystem

IMAGE_SUBSYSTEM_WINDOWS_GUI

DLL Characteristics

IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE IMAGE_DLLCHARACTERISTICS_NX_COMPAT

File Characteristics

IMAGE_FILE_EXECUTABLE_IMAGE IMAGE_FILE_LINE_NUMS_STRIPPED IMAGE_FILE_LOCAL_SYMS_STRIPPED IMAGE_FILE_LARGE_ADDRESS_AWARE IMAGE_FILE_32BIT_MACHINE IMAGE_FILE_DEBUG_STRIPPED

PDB paths

kernel32

CreateEventA CreateSemaphoreA DeleteCriticalSection EnterCriticalSection GetHandleInformation GetProcessAffinityMask GetSystemTimeAsFileTime GetThreadContext GetThreadPriority GetTickCount InitializeCriticalSection IsDebuggerPresent LeaveCriticalSection OpenProcess OutputDebugStringA RaiseException ReleaseSemaphore RemoveVectoredExceptionHandler ResetEvent ResumeThread SetEvent SetProcessAffinityMask SetThreadContext SetThreadPriority SuspendThread TryEnterCriticalSection VirtualProtect VirtualQuery WaitForMultipleObjects AddVectoredExceptionHandler CloseHandle CompareStringOrdinal CreateDirectoryW CreateFileMappingA CreateFileW CreateMutexA CreateProcessW CreateThread CreateToolhelp32Snapshot CreateWaitableTimerExW DuplicateHandle FindClose FindFirstFileExW FlsAlloc FlsFree FlsSetValue FormatMessageW FreeEnvironmentStringsW FreeLibrary GetConsoleMode GetConsoleOutputCP GetCurrentDirectoryW GetCurrentProcess GetCurrentProcessId GetCurrentThread GetCurrentThreadId GetEnvironmentStringsW GetEnvironmentVariableW GetFileAttributesW GetFileInformationByHandle GetFileInformationByHandleEx GetFullPathNameW GetLastError GetModuleFileNameW GetModuleHandleA GetModuleHandleExW GetModuleHandleW GetProcAddress GetProcessHeap GetStdHandle GetSystemDirectoryW GetSystemTimePreciseAsFileTime GetTempPathW GetWindowsDirectoryW HeapAlloc HeapFree HeapReAlloc InitOnceBeginInitialize InitOnceComplete IsThreadAFiber LoadLibraryA MapViewOfFile Module32FirstW Module32NextW MultiByteToWideChar QueryPerformanceCounter QueryPerformanceFrequency ReadFileEx ReleaseMutex RtlCaptureContext SetFileInformationByHandle SetFileTime SetLastError SetThreadStackGuarantee SetUnhandledExceptionFilter SetWaitableTimer Sleep SleepEx TlsAlloc TlsFree TlsGetValue TlsSetValue UnmapViewOfFile WaitForSingleObject WaitForSingleObjectEx WriteConsoleW WriteFileEx lstrlenW

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

_ultoa

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

__p__environ __p__wenviron

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

_set_new_mode calloc free malloc realloc

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

__setusermatherr

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

_setjmp3 longjmp memcmp memcpy memmove

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

__p___argc __p___argv __p___wargv _beginthreadex _cexit _configure_narrow_argv _configure_wide_argv _crt_at_quick_exit _crt_atexit _endthreadex _errno _exit _fpreset _initialize_narrow_environment _set_app_type _initialize_wide_environment _initterm _set_invalid_parameter_handler abort exit signal

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

__acrt_iob_func __p__commode __p__fmode __stdio_common_vfprintf __stdio_common_vfwprintf __stdio_common_vsprintf __stdio_common_vswprintf fgetwc fwrite getc

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

_strdup memset strlen strncmp

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

__daylight __timezone __tzname _tzset

ntdll

NtCreateNamedPipeFile NtOpenFile NtWriteFile RtlNtStatusToDosError

api-ms-win-core-synch-l1-2-0

WaitOnAddress WakeByAddressAll WakeByAddressSingle

Name

.text

Size

345KB

Virtual Size

344KB

Characteristics

IMAGE_SCN_CNT_CODE IMAGE_SCN_CNT_INITIALIZED_DATA IMAGE_SCN_MEM_EXECUTE IMAGE_SCN_MEM_READ

Name

.data

Size

2KB

Virtual Size

1KB

Characteristics

IMAGE_SCN_CNT_INITIALIZED_DATA IMAGE_SCN_MEM_READ IMAGE_SCN_MEM_WRITE

Name

.rdata

Size

298KB

Virtual Size

298KB

Characteristics

IMAGE_SCN_CNT_INITIALIZED_DATA IMAGE_SCN_MEM_READ

Name

.eh_fram

Size

37KB

Virtual Size

37KB

Characteristics

IMAGE_SCN_CNT_INITIALIZED_DATA IMAGE_SCN_MEM_READ

Name

.bss

Size

Virtual Size

484B

Characteristics

IMAGE_SCN_CNT_UNINITIALIZED_DATA IMAGE_SCN_MEM_READ IMAGE_SCN_MEM_WRITE

Name

.idata

Size

6KB

Virtual Size

5KB

Characteristics

IMAGE_SCN_CNT_INITIALIZED_DATA IMAGE_SCN_MEM_READ IMAGE_SCN_MEM_WRITE

Name

.CRT

Size

512B

Virtual Size

52B

Characteristics

IMAGE_SCN_CNT_INITIALIZED_DATA IMAGE_SCN_MEM_READ IMAGE_SCN_MEM_WRITE

Name

.tls

Size

512B

Virtual Size

Characteristics

IMAGE_SCN_CNT_INITIALIZED_DATA IMAGE_SCN_MEM_READ IMAGE_SCN_MEM_WRITE

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

msu.exe

kernel32

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

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

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

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

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

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-time-l1-1-0

ntdll

api-ms-win-core-synch-l1-2-0

generic