2024-04-19_0f9e5595bd3ae8ef8d79ba19d3f535c9_cobalt-strike_ryuk

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General

Target

2024-04-19_0f9e5595bd3ae8ef8d79ba19d3f535c9_cobalt-strike_ryuk
Size

299KB
MD5

0f9e5595bd3ae8ef8d79ba19d3f535c9
SHA1

eb47b939b22185295384abeacfe31301f50af298
SHA256

6440a0b9382273c8d72233756e8dcb8fefc2cb7546334618c4a80b74b43e5236
SHA512

81a83bf33b08e4256c44933c0b4635a9ad9ebfc573cf08dbe5d73274a54e5c58807f7922df9526d1bdb8da90e28fa1e7c4550de3bb0a7f81bd54fa53fa337261
SSDEEP

6144:HycJhOZNPzX8qDfOamDkDC5z8F6Afi7qLglOwl:ZAzX8wZU5YFQq8v

Score

10^/10

Malware Config

Signatures

Detects Windows executables referencing non-Windows User-Agents 1 IoCs

resource	yara_rule
sample	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA

Unsigned PE 1 IoCs

Checks for missing Authenticode signature.

resource
2024-04-19_0f9e5595bd3ae8ef8d79ba19d3f535c9_cobalt-strike_ryuk

Files

2024-04-19_0f9e5595bd3ae8ef8d79ba19d3f535c9_cobalt-strike_ryuk
.exe windows:6 windows x64 arch:x64

3bd67e8a96f214a6430be09886f28372

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

user32

MessageBoxA

kernel32

AreFileApisANSI
CloseHandle
CompareStringW
CreateEventW
CreateFileA
CreateFileMappingW
CreateFileW
DeleteCriticalSection
EncodePointer
EnterCriticalSection
ExitProcess
FindClose
FindFirstFileExW
FindFirstFileW
FindNextFileW
FindResourceW
FlushFileBuffers
FormatMessageA
FreeEnvironmentStringsW
FreeLibrary
GetACP
GetCPInfo
GetCommandLineA
GetCommandLineW
GetConsoleMode
GetConsoleOutputCP
GetCurrentProcess
GetCurrentProcessId
GetCurrentThreadId
GetEnvironmentStringsW
GetFileAttributesExW
GetFileInformationByHandleEx
GetFileType
GetLastError
GetLocaleInfoEx
GetModuleFileNameW
GetModuleHandleExW
GetModuleHandleW
GetOEMCP
GetProcAddress
GetProcessHeap
GetStartupInfoW
GetStdHandle
GetStringTypeW
GetSystemTimeAsFileTime
HeapAlloc
HeapFree
HeapReAlloc
HeapSize
InitializeCriticalSectionAndSpinCount
InitializeCriticalSectionEx
InitializeSListHead
IsDebuggerPresent
IsProcessorFeaturePresent
IsValidCodePage
LCMapStringW
LeaveCriticalSection
LoadLibraryExW
LoadResource
LocalFree
LockResource
MapViewOfFile
MultiByteToWideChar
QueryPerformanceCounter
QueryPerformanceFrequency
RaiseException
ResetEvent
RtlCaptureContext
RtlLookupFunctionEntry
RtlPcToFileHeader
RtlUnwindEx
RtlVirtualUnwind
SetEnvironmentVariableW
SetEvent
SetFilePointerEx
SetLastError
SetStdHandle
SetUnhandledExceptionFilter
SizeofResource
Sleep
TerminateProcess
TlsAlloc
TlsFree
TlsGetValue
TlsSetValue
UnhandledExceptionFilter
UnmapViewOfFile
VirtualAlloc
WaitForSingleObjectEx
WideCharToMultiByte
WriteConsoleW
WriteFile

wininet

InternetOpenUrlA
InternetOpenW
InternetReadFile

Sections

.text
Size: 187KB - Virtual size: 187KB

IMAGE_SCN_CNT_CODE
IMAGE_SCN_MEM_EXECUTE
IMAGE_SCN_MEM_READ

.rdata
Size: 65KB - Virtual size: 65KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

.data
Size: 26KB - Virtual size: 32KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
IMAGE_SCN_MEM_WRITE

.pdata
Size: 9KB - Virtual size: 9KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

.tls
Size: 512B - Virtual size: 9B

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
IMAGE_SCN_MEM_WRITE

_RDATA
Size: 512B - Virtual size: 348B

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

.rsrc
Size: 512B - Virtual size: 344B

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

.reloc
Size: 7KB - Virtual size: 7KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ

Sharing

General

Malware Config

Signatures

Files

3bd67e8a96f214a6430be09886f28372

Headers

DLL Characteristics

File Characteristics

Imports

user32

kernel32

wininet

Sections

.text Size: 187KB - Virtual size: 187KB

.rdata Size: 65KB - Virtual size: 65KB

.data Size: 26KB - Virtual size: 32KB

.pdata Size: 9KB - Virtual size: 9KB

.tls Size: 512B - Virtual size: 9B

_RDATA Size: 512B - Virtual size: 348B

.rsrc Size: 512B - Virtual size: 344B

.reloc Size: 7KB - Virtual size: 7KB

.text
Size: 187KB - Virtual size: 187KB

.rdata
Size: 65KB - Virtual size: 65KB

.data
Size: 26KB - Virtual size: 32KB

.pdata
Size: 9KB - Virtual size: 9KB

.tls
Size: 512B - Virtual size: 9B

_RDATA
Size: 512B - Virtual size: 348B

.rsrc
Size: 512B - Virtual size: 344B

.reloc
Size: 7KB - Virtual size: 7KB