skuld | WindowsUpdateService[.]exe

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General

Target

WindowsUpdateService.exe
Size

9.5MB
MD5

792d47eaf8e8f7752ee07df094f402ba
SHA1

79b8dd99dbfb362a3adbe8d5e798510623b7a9a6
SHA256

2782a2bbab02cefb45d92ad5d82d68e389286904f0cb0bd2be80562f1349bc7d
SHA512

9b67a632b0dd6dfbfa27651da2366c40e3447fc4f8a4e26e04408ea9a93c7b2742b60195b099fbf68fa2015c46644b0074960e642b75112e5c58ed09cd0b2f71
SSDEEP

98304:80gjE8Kq+sJgTVxXM29X9BdNrHEYWvFnsVs:IEe+sJit9X9BfrkY3s

Score

10^/10

skuld

Malware Config

Extracted

Family

skuld

https://discord.com/api/webhooks/1356689143555686480/UMCmU5eRng9kyD0elV8TnRdtcbuz5XqZOyd2gn-F4RSy3X4YDIk-t4mkQScULvE2-5Ke

Signatures

Skuld family
skuld

Unsigned PE 1 IoCs

Checks for missing Authenticode signature.

resource
WindowsUpdateService.exe

Files

WindowsUpdateService.exe
.exe windows:6 windows x64 arch:x64

c2d457ad8ac36fc9f18d45bffcd450c2

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

Imports

kernel32

WriteFile
WriteConsoleW
WerSetFlags
WerGetFlags
WaitForMultipleObjects
WaitForSingleObject
VirtualQuery
VirtualFree
VirtualAlloc
TlsAlloc
SwitchToThread
SuspendThread
SetWaitableTimer
SetProcessPriorityBoost
SetEvent
SetErrorMode
SetConsoleCtrlHandler
RtlVirtualUnwind
RtlLookupFunctionEntry
ResumeThread
RaiseFailFastException
PostQueuedCompletionStatus
LoadLibraryW
LoadLibraryExW
SetThreadContext
GetThreadContext
GetSystemInfo
GetSystemDirectoryA
GetStdHandle
GetQueuedCompletionStatusEx
GetProcessAffinityMask
GetProcAddress
GetErrorMode
GetEnvironmentStringsW
GetCurrentThreadId
GetConsoleMode
FreeEnvironmentStringsW
ExitProcess
DuplicateHandle
CreateWaitableTimerExW
CreateThread
CreateIoCompletionPort
CreateFileA
CreateEventA
CloseHandle
AddVectoredExceptionHandler
AddVectoredContinueHandler

Sections

.text
Size: 4.6MB - Virtual size: 4.6MB

IMAGE_SCN_CNT_CODE
IMAGE_SCN_MEM_EXECUTE
IMAGE_SCN_MEM_READ

.rdata
Size: 4.2MB - Virtual size: 4.2MB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

.data
Size: 464KB - Virtual size: 1.0MB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
IMAGE_SCN_MEM_WRITE

.pdata
Size: 107KB - Virtual size: 107KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

.xdata
Size: 512B - Virtual size: 180B

IMAGE_SCN_CNT_INITIALIZED_DATA
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: 64KB - Virtual size: 63KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ

.symtab
Size: 512B - Virtual size: 4B

IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ

Sharing

General

Malware Config

Extracted

Signatures

Files

c2d457ad8ac36fc9f18d45bffcd450c2

Headers

DLL Characteristics

File Characteristics

Imports

kernel32

Sections

.text Size: 4.6MB - Virtual size: 4.6MB

.rdata Size: 4.2MB - Virtual size: 4.2MB

.data Size: 464KB - Virtual size: 1.0MB

.pdata Size: 107KB - Virtual size: 107KB

.xdata Size: 512B - Virtual size: 180B

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

.reloc Size: 64KB - Virtual size: 63KB

.symtab Size: 512B - Virtual size: 4B

.text
Size: 4.6MB - Virtual size: 4.6MB

.rdata
Size: 4.2MB - Virtual size: 4.2MB

.data
Size: 464KB - Virtual size: 1.0MB

.pdata
Size: 107KB - Virtual size: 107KB

.xdata
Size: 512B - Virtual size: 180B

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

.reloc
Size: 64KB - Virtual size: 63KB

.symtab
Size: 512B - Virtual size: 4B