2024-01-18_527f4a4a0961e715b7ddeae624ea8829_ryuk

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General

Target

2024-01-18_527f4a4a0961e715b7ddeae624ea8829_ryuk
Size

3.5MB
MD5

527f4a4a0961e715b7ddeae624ea8829
SHA1

3766414d83caef1be85f6388d4334169bb89409c
SHA256

6dd0103736c1368c5e2ac6d719f922252fde4381eb53c54122ba9fc61703a139
SHA512

18c558a104e57d05a14b1eb73bf8c032731adb1e20c81142ff328afd7626193188d408bd6ffa2aa9d8afe4461bf9fcf3d1e999bb94cbb4d7eea5ff33b7b01af4
SSDEEP

49152:K0GZWVxCDrYgrUEmRlETV6+7b9MScl3qo1CUVwA+NxqEpEyf+56I0FXPb2e0bj+F:AhzdBT/ktbeN4EY56mf/+F

Score

10^/10

Malware Config

Signatures

Detects executables containing bas64 encoded gzip files 1 IoCs

resource	yara_rule
sample	INDICATOR_SUSPICIOUS_EXE_Embedded_Gzip_B64Encoded_File

Files

2024-01-18_527f4a4a0961e715b7ddeae624ea8829_ryuk
.exe windows:6 windows x64 arch:x64

48a43683158a953db55ce59b9d180d57

Code Sign

0b:eb:09:d9:e9:f5:0b:e4:02:b7:f0:96:e5:7e:bb:5a
Certificate

Issuer

CN=DigiCert Trusted G4 Code Signing RSA4096 SHA384 2021 CA1,O=DigiCert\, Inc.,C=US

Not Before

05/01/2023, 00:00

Not After

04/01/2024, 23:59

Subject

CN=Auvik Networks Inc.,O=Auvik Networks Inc.,L=Waterloo,ST=Ontario,C=CA

Extended Key Usages

ExtKeyUsageCodeSigning

Key Usages

KeyUsageDigitalSignature

0e:9b:18:8e:f9:d0:2d:e7:ef:db:50:e2:08:40:18:5a
Certificate

Issuer

CN=DigiCert Assured ID Root CA,OU=www.digicert.com,O=DigiCert Inc,C=US

Not Before

01/08/2022, 00:00

Not After

09/11/2031, 23:59

Subject

CN=DigiCert Trusted Root G4,OU=www.digicert.com,O=DigiCert Inc,C=US

Key Usages

KeyUsageDigitalSignature
KeyUsageCertSign
KeyUsageCRLSign

07:36:37:b7:24:54:7c:d8:47:ac:fd:28:66:2a:5e:5b
Certificate

Issuer

CN=DigiCert Trusted Root G4,OU=www.digicert.com,O=DigiCert Inc,C=US

Not Before

23/03/2022, 00:00

Not After

22/03/2037, 23:59

Subject

CN=DigiCert Trusted G4 RSA4096 SHA256 TimeStamping CA,O=DigiCert\, Inc.,C=US

Extended Key Usages

ExtKeyUsageTimeStamping

Key Usages

KeyUsageDigitalSignature
KeyUsageCertSign
KeyUsageCRLSign

05:44:af:f3:94:9d:08:39:a6:bf:db:3f:5f:e5:61:16
Certificate

Issuer

CN=DigiCert Trusted G4 RSA4096 SHA256 TimeStamping CA,O=DigiCert\, Inc.,C=US

Not Before

14/07/2023, 00:00

Not After

13/10/2034, 23:59

Subject

CN=DigiCert Timestamp 2023,O=DigiCert\, Inc.,C=US

Extended Key Usages

ExtKeyUsageTimeStamping

Key Usages

KeyUsageDigitalSignature

d7:a6:8f:b6:ee:6d:d0:b1:aa:ff:df:f5:04:a5:7a:47:36:6e:2c:b7
Signer

Actual PE Digest

d7:a6:8f:b6:ee:6d:d0:b1:aa:ff:df:f5:04:a5:7a:47:36:6e:2c:b7

Digest Algorithm

sha1

PE Digest Matches

true

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

setupapi

SetupDiDestroyDeviceInfoList
SetupDiGetDeviceInterfaceDetailA
SetupDiGetClassDevsA
SetupDiEnumDeviceInterfaces

dbghelp

SymGetLineFromAddr64
SymInitialize
StackWalk64
SymFromAddr
SymGetModuleBase64
SymFunctionTableAccess64

iphlpapi

GetAdaptersAddresses
SendARP
ConvertLengthToIpv4Mask
GetAdaptersInfo

ws2_32

WSASetLastError
WSASocketW
listen
closesocket
getsockname
send
recv
accept
__WSAFDIsSet
setsockopt
socket
sendto
getsockopt
recvfrom
connect
shutdown
WSAIoctl
GetAddrInfoW
ioctlsocket
WSAGetLastError
ntohl
ntohs
gethostname
htonl
htons
bind
WSAStartup
WSACleanup
FreeAddrInfoW
select

crypt32

CertCreateSelfSignCertificate
CertFreeCertificateContext
CryptMsgOpenToEncode
CertAddCertificateContextToStore
PFXExportCertStore
CryptSignAndEncodeCertificate
CertCloseStore
CertStrToNameA
CryptMsgGetParam
CryptEncodeObject
CertSetCertificateContextProperty
CertFindCertificateInStore
CryptMsgCalculateEncodedLength
CertOpenStore
CertStrToNameW
CertGetCertificateContextProperty
CertDuplicateCertificateContext
CertEnumCertificatesInStore
CryptExportPublicKeyInfo
CryptMsgUpdate
CryptMsgClose
CertAddEncodedCertificateToStore
CryptAcquireCertificatePrivateKey
CertDeleteCertificateFromStore

wintrust

WTHelperGetProvSignerFromChain
WinVerifyTrust
WTHelperGetProvCertFromChain
WTHelperProvDataFromStateData

version

VerQueryValueA
GetFileVersionInfoSizeA
GetFileVersionInfoA

gdiplus

GdipAlloc
GdipCloneImage
GdipGetImageEncoders
GdiplusShutdown
GdiplusStartup
GdipSaveImageToStream
GdipGetImageEncodersSize
GdipDisposeImage
GdipFree
GdipLoadImageFromStream

winhttp

WinHttpGetIEProxyConfigForCurrentUser

ncrypt

NCryptSetProperty
BCryptGenRandom
NCryptCreatePersistedKey
NCryptFreeObject
BCryptCloseAlgorithmProvider
BCryptOpenAlgorithmProvider
NCryptOpenStorageProvider
NCryptFinalizeKey

kernel32

InitializeSListHead
GetStartupInfoW
RtlUnwindEx
EnterCriticalSection
LeaveCriticalSection
DeleteCriticalSection
MoveFileExW
GetTimeZoneInformation
SetStdHandle
GetCommandLineA
GetCommandLineW
GetModuleFileNameA
GetStdHandle
WriteFile
LoadLibraryExA
GetFullPathNameA
GetSystemPowerStatus
SetCurrentDirectoryA
Sleep
GetLastError
CloseHandle
GetProcAddress
FreeLibrary
CreateProcessA
LoadLibraryA
ReadFile
GetCurrentThreadId
GetVersionExA
CreateThread
SleepEx
SetSystemPowerState
GetCurrentProcess
SetThreadExecutionState
HeapFree
HeapAlloc
GetProcessHeap
SystemTimeToFileTime
GetSystemTime
FileTimeToSystemTime
GetACP
SystemTimeToTzSpecificLocalTime
QueryPerformanceCounter
ReleaseSemaphore
WaitForSingleObject
CreateSemaphoreA
CancelIo
FindFirstFileW
FindNextFileW
RemoveDirectoryW
GetDriveTypeA
FindFirstVolumeA
FindClose
GetVolumePathNamesForVolumeNameA
GetFileAttributesExW
CreateFileA
ReadDirectoryChangesW
FindNextVolumeA
FindVolumeClose
GetDiskFreeSpaceExA
CreateEventA
GetModuleHandleExA
DeviceIoControl
ResetEvent
InitializeCriticalSectionAndSpinCount
GetOverlappedResult
MultiByteToWideChar
WideCharToMultiByte
CreateNamedPipeA
LocalFree
ConnectNamedPipe
SetConsoleOutputCP
IsDebuggerPresent
GetCurrentDirectoryA
IsProcessorFeaturePresent
SetEvent
WaitForSingleObjectEx
GetThreadId
SetEnvironmentVariableA
GetCurrentProcessId
GetEnvironmentStrings
FreeEnvironmentStringsA
CopyFileA
RtlCaptureContext
DuplicateHandle
GetModuleHandleA
GetCurrentThread
DeleteFileA
GetTickCount
OpenThread
TerminateProcess
WriteFileEx
WaitForMultipleObjectsEx
ReadFileEx
CancelIoEx
WTSGetActiveConsoleSessionId
GetExitCodeProcess
SetConsoleCtrlHandler
GetModuleFileNameW
GetTempPathA
GlobalFree
EncodePointer
RemoveDirectoryA
CreateDirectoryA
GetFileType
GetModuleHandleW
SwitchToFiber
DeleteFiber
CreateFiber
GetSystemTimeAsFileTime
ConvertFiberToThread
ConvertThreadToFiber
GlobalMemoryStatus
GetEnvironmentVariableW
GetConsoleMode
ReadConsoleA
ReadConsoleW
SetConsoleMode
SetLastError
GetDateFormatW
GetTimeFormatW
CompareStringW
LCMapStringW
SetFilePointerEx
GetConsoleCP
GetStringTypeW
HeapReAlloc
FlushFileBuffers
GetCPInfo
FindFirstFileExA
FindNextFileA
IsValidCodePage
GetOEMCP
GetEnvironmentStringsW
FreeEnvironmentStringsW
RtlLookupFunctionEntry
RtlVirtualUnwind
UnhandledExceptionFilter
CancelSynchronousIo
SetUnhandledExceptionFilter
WriteConsoleW
CreateFileW
RaiseException
HeapSize
SetEndOfFile
GetDriveTypeW
TlsAlloc
TlsGetValue
TlsSetValue
TlsFree
LoadLibraryExW
ExitProcess
GetModuleHandleExW
CreateDirectoryW
DeleteFileW
QueueUserAPC
PeekNamedPipe
GetCurrentDirectoryW
GetFullPathNameW
RtlPcToFileHeader
QueryPerformanceFrequency
FreeConsole

user32

MessageBeep
ExitWindowsEx
GetDC
ReleaseDC
GetUserObjectInformationA
CloseWindowStation
EnumDisplayMonitors
GetSystemMetrics
SetThreadDesktop
GetThreadDesktop
CloseDesktop
EnableWindow
OpenDesktopA
GetMonitorInfoA
SetProcessWindowStation
OpenInputDesktop
SendMessageA
FindWindowA
MapVirtualKeyA
GetForegroundWindow
SetForegroundWindow
SendInput
SetProcessDPIAware
GetDlgItem
SetWindowTextA
SetWindowPlacement
ShowWindow
GetWindowPlacement
DialogBoxParamA
EndDialog
GetProcessWindowStation
GetUserObjectInformationW
MessageBoxW
OpenWindowStationA

gdi32

DeleteObject
SetStretchBltMode
DeleteDC
GetDIBits
StretchBlt
CreateCompatibleDC
SelectObject
CreateCompatibleBitmap
BitBlt

advapi32

RegCreateKeyA
RegDeleteKeyA
RegQueryValueExA
RegSetValueExA
RegOpenKeyExA
RegDeleteValueA
OpenProcessToken
InitiateSystemShutdownA
LookupPrivilegeValueA
AdjustTokenPrivileges
CryptReleaseContext
RegCreateKeyW
RegSetValueExW
CryptDestroyKey
InitializeSecurityDescriptor
SetEntriesInAclA
SetSecurityDescriptorDacl
DuplicateTokenEx
SetTokenInformation
CreateProcessAsUserA
OpenServiceA
ChangeServiceConfig2A
CheckTokenMembership
FreeSid
StartServiceA
ControlService
DeleteService
RegisterServiceCtrlHandlerExA
OpenSCManagerA
SetServiceStatus
AllocateAndInitializeSid
CloseServiceHandle
QueryServiceStatus
StartServiceCtrlDispatcherA
CreateServiceA
DeregisterEventSource
RegisterEventSourceW
ReportEventW
CryptAcquireContextW
RegCloseKey
CryptSetHashParam
CryptGetProvParam
CryptGetUserKey
CryptExportKey
CryptDecrypt
CryptCreateHash
CryptDestroyHash
CryptSignHashW
CryptEnumProvidersW
CryptGenRandom

shell32

SHGetFolderPathA
ShellExecuteExA

ole32

CoUninitialize
CoCreateInstance
CreateStreamOnHGlobal
CoInitializeEx

oleaut32

SysAllocString
SysStringLen
SysFreeString

Sections

.text
Size: 1.6MB - Virtual size: 1.6MB

IMAGE_SCN_CNT_CODE
IMAGE_SCN_MEM_EXECUTE
IMAGE_SCN_MEM_READ

.rdata
Size: 850KB - Virtual size: 849KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

.data
Size: 13KB - Virtual size: 160KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
IMAGE_SCN_MEM_WRITE

.pdata
Size: 86KB - Virtual size: 85KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

.gfids
Size: 512B - Virtual size: 196B

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

.rsrc
Size: 18KB - Virtual size: 18KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

.reloc
Size: 16KB - Virtual size: 16KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ

Sharing

General

Malware Config

Signatures

Files

48a43683158a953db55ce59b9d180d57

Code Sign

0b:eb:09:d9:e9:f5:0b:e4:02:b7:f0:96:e5:7e:bb:5aCertificate

Extended Key Usages

Key Usages

0e:9b:18:8e:f9:d0:2d:e7:ef:db:50:e2:08:40:18:5aCertificate

Key Usages

07:36:37:b7:24:54:7c:d8:47:ac:fd:28:66:2a:5e:5bCertificate

Extended Key Usages

Key Usages

05:44:af:f3:94:9d:08:39:a6:bf:db:3f:5f:e5:61:16Certificate

Extended Key Usages

Key Usages

d7:a6:8f:b6:ee:6d:d0:b1:aa:ff:df:f5:04:a5:7a:47:36:6e:2c:b7Signer

Headers

DLL Characteristics

File Characteristics

Imports

setupapi

dbghelp

iphlpapi

ws2_32

crypt32

wintrust

version

gdiplus

winhttp

ncrypt

kernel32

user32

gdi32

advapi32

shell32

ole32

oleaut32

Sections

.text Size: 1.6MB - Virtual size: 1.6MB

.rdata Size: 850KB - Virtual size: 849KB

.data Size: 13KB - Virtual size: 160KB

.pdata Size: 86KB - Virtual size: 85KB

.gfids Size: 512B - Virtual size: 196B

.rsrc Size: 18KB - Virtual size: 18KB

.reloc Size: 16KB - Virtual size: 16KB

0b:eb:09:d9:e9:f5:0b:e4:02:b7:f0:96:e5:7e:bb:5a
Certificate

0e:9b:18:8e:f9:d0:2d:e7:ef:db:50:e2:08:40:18:5a
Certificate

07:36:37:b7:24:54:7c:d8:47:ac:fd:28:66:2a:5e:5b
Certificate

05:44:af:f3:94:9d:08:39:a6:bf:db:3f:5f:e5:61:16
Certificate

d7:a6:8f:b6:ee:6d:d0:b1:aa:ff:df:f5:04:a5:7a:47:36:6e:2c:b7
Signer

.text
Size: 1.6MB - Virtual size: 1.6MB

.rdata
Size: 850KB - Virtual size: 849KB

.data
Size: 13KB - Virtual size: 160KB

.pdata
Size: 86KB - Virtual size: 85KB

.gfids
Size: 512B - Virtual size: 196B

.rsrc
Size: 18KB - Virtual size: 18KB

.reloc
Size: 16KB - Virtual size: 16KB