csrss[.]exe | Triage

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General

Target

csrss.exe
Size

1.2MB
MD5

354b34a3694e2b4d54ba3bca624aa3c3
SHA1

660ee183f7f7a17eace0556c8883a2c361424cb0
SHA256

52e5414e2e8aabecfc1c38926a3d863e1ee26bef5dc8453fc0568d9f263cf384
SHA512

f78bbbd45ee9dc147394f79c0aed2c8104c42116b72c653586ac0855d0c075e3b17571bc62e33ba055bcc91197f6e2a491e97ad35eab8f425bbf713a5e0b5870
SSDEEP

24576:+tb20pkaCqT5TBWgNQ7aLHWD2rmiOWlcIqDBZLAkxy06A:rVg5tQ7aLHWDd/B9A65

Score

5^/10

Malware Config

Signatures

AutoIT Executable 1 IoCs

AutoIT scripts compiled to PE executables.

resource	yara_rule
sample	autoit_exe

Unsigned PE 1 IoCs

Checks for missing Authenticode signature.

resource
csrss.exe

Files

csrss.exe
.exe windows:5 windows x86 arch:x86

7f2222d75bcebeb591b7d884c5b9299b

Headers

DLL Characteristics

IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE
IMAGE_DLLCHARACTERISTICS_TERMINAL_SERVER_AWARE

File Characteristics

IMAGE_FILE_EXECUTABLE_IMAGE
IMAGE_FILE_LARGE_ADDRESS_AWARE
IMAGE_FILE_32BIT_MACHINE

Imports

wsock32

__WSAFDIsSet
recv
send
setsockopt
ntohs
recvfrom
select
WSAStartup
htons
accept
listen
bind
closesocket
connect
WSACleanup
ioctlsocket
sendto
WSAGetLastError
inet_addr
gethostbyname
gethostname
socket

version

GetFileVersionInfoW
VerQueryValueW
GetFileVersionInfoSizeW

winmm

timeGetTime
waveOutSetVolume
mciSendStringW

comctl32

ImageList_Destroy
ImageList_Remove
ImageList_SetDragCursorImage
ImageList_BeginDrag
ImageList_DragEnter
ImageList_DragLeave
ImageList_EndDrag
ImageList_DragMove
ImageList_Create
InitCommonControlsEx
ImageList_ReplaceIcon

mpr

WNetUseConnectionW
WNetCancelConnection2W
WNetGetConnectionW
WNetAddConnection2W

wininet

InternetReadFile
InternetCloseHandle
InternetOpenW
InternetSetOptionW
InternetCrackUrlW
HttpQueryInfoW
InternetQueryOptionW
HttpOpenRequestW
HttpSendRequestW
FtpOpenFileW
FtpGetFileSize
InternetOpenUrlW
InternetConnectW
InternetQueryDataAvailable

psapi

GetProcessMemoryInfo

iphlpapi

IcmpCreateFile
IcmpCloseHandle
IcmpSendEcho

userenv

UnloadUserProfile
DestroyEnvironmentBlock
CreateEnvironmentBlock
LoadUserProfileW

uxtheme

IsThemeActive

kernel32

HeapAlloc
GetProcessHeap
HeapFree
Sleep
GetCurrentThreadId
MultiByteToWideChar
MulDiv
GetVersionExW
GetSystemInfo
FreeLibrary
LoadLibraryA
GetProcAddress
SetErrorMode
GetModuleFileNameW
WideCharToMultiByte
lstrcpyW
lstrlenW
GetModuleHandleW
QueryPerformanceCounter
VirtualFreeEx
OpenProcess
VirtualAllocEx
WriteProcessMemory
ReadProcessMemory
CreateFileW
SetFilePointerEx
ReadFile
WriteFile
FlushFileBuffers
TerminateProcess
CreateToolhelp32Snapshot
Process32FirstW
Process32NextW
SetFileTime
GetFileAttributesW
FindFirstFileW
FindClose
GetLongPathNameW
GetCurrentThread
FindNextFileW
MoveFileW
CopyFileW
CreateDirectoryW
RemoveDirectoryW
SetSystemPowerState
QueryPerformanceFrequency
FindResourceW
LoadResource
LockResource
SizeofResource
EnumResourceNamesW
OutputDebugStringW
GetTempPathW
GetTempFileNameW
DeviceIoControl
GetLocalTime
CompareStringW
DeleteCriticalSection
WaitForSingleObject
LeaveCriticalSection
GetStdHandle
CreatePipe
InterlockedExchange
TerminateThread
LoadLibraryExW
FindResourceExW
VirtualFree
FormatMessageW
GetExitCodeProcess
GetPrivateProfileStringW
WritePrivateProfileStringW
GetPrivateProfileSectionW
WritePrivateProfileSectionW
GetPrivateProfileSectionNamesW
FileTimeToLocalFileTime
FileTimeToSystemTime
SystemTimeToFileTime
LocalFileTimeToFileTime
GetDriveTypeW
GetDiskFreeSpaceExW
GetDiskFreeSpaceW
GetVolumeInformationW
SetVolumeLabelW
CreateHardLinkW
SetFileAttributesW
GetShortPathNameW
CreateEventW
SetEvent
GetEnvironmentVariableW
SetEnvironmentVariableW
GlobalLock
GlobalUnlock
GlobalAlloc
GetFileSize
GlobalFree
GlobalMemoryStatusEx
Beep
GetSystemDirectoryW
GetComputerNameW
GetWindowsDirectoryW
GetCurrentProcessId
GetProcessIoCounters
CreateProcessW
SetPriorityClass
LoadLibraryW
VirtualAlloc
CloseHandle
GetLastError
GetFullPathNameW
SetCurrentDirectoryW
IsDebuggerPresent
GetCurrentDirectoryW
lstrcmpiW
RaiseException
InitializeCriticalSectionAndSpinCount
InterlockedDecrement
InterlockedIncrement
CreateThread
DuplicateHandle
EnterCriticalSection
GetCurrentProcess
ExitProcess
GetModuleHandleExW
ExitThread
GetSystemTimeAsFileTime
ResumeThread
GetCommandLineW
IsProcessorFeaturePresent
HeapSize
IsValidCodePage
GetACP
GetOEMCP
GetCPInfo
SetLastError
UnhandledExceptionFilter
SetUnhandledExceptionFilter
TlsAlloc
TlsGetValue
TlsSetValue
TlsFree
GetStartupInfoW
GetStringTypeW
SetStdHandle
GetFileType
GetConsoleCP
GetConsoleMode
RtlUnwind
ReadConsoleW
SetFilePointer
GetTimeZoneInformation
GetDateFormatW
GetTimeFormatW
LCMapStringW
GetEnvironmentStringsW
FreeEnvironmentStringsW
HeapReAlloc
WriteConsoleW
SetEndOfFile
DeleteFileW
SetEnvironmentVariableA

user32

SetWindowPos
GetCursorInfo
RegisterHotKey
ClientToScreen
GetKeyboardLayoutNameW
IsCharAlphaW
IsCharAlphaNumericW
IsCharLowerW
IsCharUpperW
GetMenuStringW
GetSubMenu
GetCaretPos
IsZoomed
MonitorFromPoint
GetMonitorInfoW
SetWindowLongW
SetLayeredWindowAttributes
FlashWindow
GetClassLongW
TranslateAcceleratorW
IsDialogMessageW
GetSysColor
InflateRect
DrawFocusRect
DrawTextW
FrameRect
DrawFrameControl
FillRect
PtInRect
DestroyAcceleratorTable
CreateAcceleratorTableW
SetCursor
GetWindowDC
GetSystemMetrics
DrawMenuBar
GetActiveWindow
CharNextW
wsprintfW
RedrawWindow
DestroyMenu
SetMenu
GetWindowTextLengthW
CreateMenu
IsDlgButtonChecked
DefDlgProcW
CallWindowProcW
ReleaseCapture
SetCapture
MonitorFromRect
LoadImageW
CreateIconFromResourceEx
mouse_event
ExitWindowsEx
SetActiveWindow
FindWindowExW
EnumThreadWindows
SetMenuDefaultItem
InsertMenuItemW
IsMenu
TrackPopupMenuEx
GetCursorPos
CopyImage
CheckMenuRadioItem
GetMenuItemID
GetMenuItemCount
SetMenuItemInfoW
GetMenuItemInfoW
SetForegroundWindow
IsIconic
FindWindowW
UnregisterHotKey
keybd_event
SendInput
GetAsyncKeyState
SetKeyboardState
GetKeyboardState
GetKeyState
VkKeyScanW
LoadStringW
DialogBoxParamW
MessageBeep
EndDialog
SendDlgItemMessageW
GetDlgItem
SetWindowTextW
CopyRect
ReleaseDC
GetDC
EndPaint
BeginPaint
GetClientRect
GetMenu
DestroyWindow
EnumWindows
GetDesktopWindow
IsWindow
IsWindowEnabled
IsWindowVisible
EnableWindow
InvalidateRect
GetWindowLongW
GetWindowThreadProcessId
AttachThreadInput
GetFocus
ScreenToClient
SendMessageTimeoutW
EnumChildWindows
CharUpperBuffW
GetClassNameW
GetParent
GetDlgCtrlID
SendMessageW
MapVirtualKeyW
PostMessageW
GetWindowRect
SetUserObjectSecurity
CloseDesktop
CloseWindowStation
OpenDesktopW
SetProcessWindowStation
GetProcessWindowStation
OpenWindowStationW
GetUserObjectSecurity
AdjustWindowRectEx
SetRect
SetClipboardData
EmptyClipboard
CountClipboardFormats
CloseClipboard
GetClipboardData
IsClipboardFormatAvailable
OpenClipboard
BlockInput
GetMessageW
LockWindowUpdate
DispatchMessageW
TranslateMessage
DeleteMenu
PeekMessageW
MessageBoxW
DefWindowProcW
MoveWindow
SetFocus
PostQuitMessage
KillTimer
CreatePopupMenu
RegisterWindowMessageW
SetTimer
ShowWindow
CreateWindowExW
RegisterClassExW
LoadIconW
LoadCursorW
GetSysColorBrush
GetForegroundWindow
MessageBoxA
DestroyIcon
SystemParametersInfoW
CharLowerBuffW
GetWindowTextW

gdi32

SetPixel
DeleteObject
GetTextExtentPoint32W
ExtCreatePen
StrokeAndFillPath
StrokePath
GetDeviceCaps
CloseFigure
LineTo
AngleArc
CreateCompatibleBitmap
CreateCompatibleDC
MoveToEx
Ellipse
PolyDraw
BeginPath
SelectObject
StretchBlt
GetDIBits
DeleteDC
GetPixel
CreateDCW
GetStockObject
Rectangle
SetViewportOrgEx
GetObjectW
SetBkMode
RoundRect
SetBkColor
CreatePen
CreateSolidBrush
SetTextColor
CreateFontW
GetTextFaceW
EndPath

comdlg32

GetSaveFileNameW
GetOpenFileNameW

advapi32

GetAclInformation
RegEnumValueW
RegDeleteValueW
RegDeleteKeyW
RegEnumKeyExW
RegSetValueExW
RegCreateKeyExW
GetUserNameW
RegOpenKeyExW
RegCloseKey
RegQueryValueExW
RegConnectRegistryW
InitializeSecurityDescriptor
InitializeAcl
AdjustTokenPrivileges
OpenThreadToken
OpenProcessToken
LookupPrivilegeValueW
DuplicateTokenEx
CreateProcessAsUserW
CreateProcessWithLogonW
GetLengthSid
CopySid
InitiateSystemShutdownExW
LogonUserW
AllocateAndInitializeSid
CheckTokenMembership
FreeSid
GetTokenInformation
GetSecurityDescriptorDacl
SetSecurityDescriptorDacl
AddAce
GetAce

shell32

DragQueryPoint
ShellExecuteExW
DragQueryFileW
SHEmptyRecycleBinW
SHGetPathFromIDListW
SHBrowseForFolderW
SHCreateShellItem
SHGetDesktopFolder
SHGetSpecialFolderLocation
SHGetFolderPathW
SHFileOperationW
ExtractIconExW
Shell_NotifyIconW
ShellExecuteW
DragFinish

ole32

CoTaskMemAlloc
CoTaskMemFree
CLSIDFromString
ProgIDFromCLSID
CLSIDFromProgID
OleSetMenuDescriptor
MkParseDisplayName
OleSetContainedObject
CoCreateInstance
IIDFromString
StringFromGUID2
CreateStreamOnHGlobal
CoInitialize
CoUninitialize
GetRunningObjectTable
CoGetInstanceFromFile
CoGetObject
CoInitializeSecurity
CoCreateInstanceEx
CoSetProxyBlanket

oleaut32

RegisterTypeLi
LoadTypeLibEx
VariantCopyInd
SysReAllocString
SysFreeString
SafeArrayDestroyDescriptor
SafeArrayDestroyData
SafeArrayUnaccessData
SafeArrayAccessData
SafeArrayAllocData
UnRegisterTypeLi
SafeArrayCreateVector
SysAllocString
SysStringLen
VariantTimeToSystemTime
VarR8FromDec
SafeArrayGetVartype
OleLoadPicture
QueryPathOfRegTypeLi
VariantCopy
VariantClear
CreateDispTypeInfo
CreateStdDispatch
DispCallFunc
VariantChangeType
SafeArrayAllocDescriptorEx
VariantInit

Sections

.text
Size: 557KB - Virtual size: 557KB

IMAGE_SCN_CNT_CODE
IMAGE_SCN_MEM_EXECUTE
IMAGE_SCN_MEM_READ

.rdata
Size: 179KB - Virtual size: 179KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

.data
Size: 24KB - Virtual size: 39KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
IMAGE_SCN_MEM_WRITE

.rsrc
Size: 459KB - Virtual size: 459KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

.reloc
Size: 41KB - Virtual size: 41KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ

Sharing

General

Malware Config

Signatures

Files

7f2222d75bcebeb591b7d884c5b9299b

Headers

DLL Characteristics

File Characteristics

Imports

wsock32

version

winmm

comctl32

mpr

wininet

psapi

iphlpapi

userenv

uxtheme

kernel32

user32

gdi32

comdlg32

advapi32

shell32

ole32

oleaut32

Sections

.text Size: 557KB - Virtual size: 557KB

.rdata Size: 179KB - Virtual size: 179KB

.data Size: 24KB - Virtual size: 39KB

.rsrc Size: 459KB - Virtual size: 459KB

.reloc Size: 41KB - Virtual size: 41KB

.text
Size: 557KB - Virtual size: 557KB

.rdata
Size: 179KB - Virtual size: 179KB

.data
Size: 24KB - Virtual size: 39KB

.rsrc
Size: 459KB - Virtual size: 459KB

.reloc
Size: 41KB - Virtual size: 41KB