bazarbackdoor | floss[.]exe

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General

Target

floss.exe
Size

28.0MB
MD5

c59d909c5a31f5859bda2dcb320ea647
SHA1

c163700b8cac31320fc237987274fce3f471ffa1
SHA256

c8f588664d51bd8c6d98f5b55a90b1397e7506c6b818f60906e3a849ac04ee21
SHA512

a86c1157674f5207a6f796990e0b179c2a9459af827ecd1452de1a7a34a2f4ed22b94ca5857da60a8c1ed74aafc76997cc6c283ab679aa4e4a50804ba308993e
SSDEEP

393216:d2FjsCEDYR0tUJ83a10QUs9Gzy/D+1MPmy2ZDop6R7N/+XBa4EMa+9kxlXLmwJT4:d2FjsCEDYykEaE1zozeyAZWXBikO2QW

Score

10^/10

pyinstaller bazarbackdoor

Malware Config

Signatures

Bazar/Team9 Backdoor payload 1 IoCs

Processes:

resource yara_rule

sample BazarBackdoorVar3
Bazarbackdoor family
bazarbackdoor
Detects Pyinstaller 1 IoCs
pyinstaller

Processes:

resource yara_rule

sample pyinstaller
Unsigned PE 1 IoCs
Checks for missing Authenticode signature.

Processes:

resource

floss.exe

resource	yara_rule
sample	BazarBackdoorVar3

resource	yara_rule
sample	pyinstaller

resource
floss.exe

Files

floss.exe
.exe windows x64

ba5546933531fafa869b1f86a4e2a959

Headers

DLL Characteristics

IMAGE_DLLCHARACTERISTICS_HIGH_ENTROPY_VA
IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE
IMAGE_DLLCHARACTERISTICS_NX_COMPAT
IMAGE_DLLCHARACTERISTICS_GUARD_CF
IMAGE_DLLCHARACTERISTICS_TERMINAL_SERVER_AWARE

File Characteristics

IMAGE_FILE_EXECUTABLE_IMAGE
IMAGE_FILE_LARGE_ADDRESS_AWARE

Imports

kernel32

GetCommandLineW
GetEnvironmentVariableW
SetEnvironmentVariableW
ExpandEnvironmentStringsW
CreateDirectoryW
GetTempPathW
WaitForSingleObject
Sleep
GetExitCodeProcess
CreateProcessW
GetStartupInfoW
LoadLibraryExW
SetConsoleCtrlHandler
FindClose
FindFirstFileExW
CloseHandle
GetCurrentProcess
LocalFree
FormatMessageW
MultiByteToWideChar
WideCharToMultiByte
WriteConsoleW
GetProcAddress
GetModuleFileNameW
SetDllDirectoryW
FreeLibrary
GetLastError
RtlCaptureContext
RtlLookupFunctionEntry
RtlVirtualUnwind
UnhandledExceptionFilter
SetUnhandledExceptionFilter
TerminateProcess
IsProcessorFeaturePresent
QueryPerformanceCounter
GetCurrentProcessId
GetCurrentThreadId
GetSystemTimeAsFileTime
InitializeSListHead
IsDebuggerPresent
GetModuleHandleW
RtlUnwindEx
SetLastError
EnterCriticalSection
LeaveCriticalSection
DeleteCriticalSection
InitializeCriticalSectionAndSpinCount
TlsAlloc
TlsGetValue
TlsSetValue
TlsFree
EncodePointer
RaiseException
RtlPcToFileHeader
GetCommandLineA
CreateFileW
GetDriveTypeW
GetFileInformationByHandle
GetFileType
PeekNamedPipe
SystemTimeToTzSpecificLocalTime
FileTimeToSystemTime
GetFullPathNameW
RemoveDirectoryW
FindNextFileW
SetStdHandle
DeleteFileW
ReadFile
GetStdHandle
WriteFile
ExitProcess
GetModuleHandleExW
HeapFree
GetConsoleMode
ReadConsoleW
SetFilePointerEx
GetConsoleOutputCP
GetFileSizeEx
HeapAlloc
FlsAlloc
FlsGetValue
FlsSetValue
FlsFree
CompareStringW
LCMapStringW
GetCurrentDirectoryW
FlushFileBuffers
HeapReAlloc
GetFileAttributesExW
GetStringTypeW
IsValidCodePage
GetACP
GetOEMCP
GetCPInfo
GetEnvironmentStringsW
FreeEnvironmentStringsW
GetProcessHeap
GetTimeZoneInformation
HeapSize
SetEndOfFile

advapi32

ConvertSidToStringSidW
GetTokenInformation
OpenProcessToken
ConvertStringSecurityDescriptorToSecurityDescriptorW

Sections

.text
Size: 162KB - Virtual size: 162KB

IMAGE_SCN_CNT_CODE
IMAGE_SCN_MEM_EXECUTE
IMAGE_SCN_MEM_READ

.rdata
Size: 74KB - Virtual size: 73KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

.data
Size: 3KB - Virtual size: 64KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
IMAGE_SCN_MEM_WRITE

.pdata
Size: 8KB - Virtual size: 8KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

_RDATA
Size: 512B - Virtual size: 348B

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

.rsrc
Size: 14KB - Virtual size: 13KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

.reloc
Size: 2KB - Virtual size: 1KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ

Sharing

General

Malware Config

Signatures

Files

ba5546933531fafa869b1f86a4e2a959

Headers

DLL Characteristics

File Characteristics

Imports

kernel32

advapi32

Sections

.text Size: 162KB - Virtual size: 162KB

.rdata Size: 74KB - Virtual size: 73KB

.data Size: 3KB - Virtual size: 64KB

.pdata Size: 8KB - Virtual size: 8KB

_RDATA Size: 512B - Virtual size: 348B

.rsrc Size: 14KB - Virtual size: 13KB

.reloc Size: 2KB - Virtual size: 1KB

.text
Size: 162KB - Virtual size: 162KB

.rdata
Size: 74KB - Virtual size: 73KB

.data
Size: 3KB - Virtual size: 64KB

.pdata
Size: 8KB - Virtual size: 8KB

_RDATA
Size: 512B - Virtual size: 348B

.rsrc
Size: 14KB - Virtual size: 13KB

.reloc
Size: 2KB - Virtual size: 1KB