zlib[.]dll | Triage

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General

Target

zlib.dll
Size

158KB
MD5

bc8e5c431707430433003562b412a0b3
SHA1

305c17e0c923d7c2f0f0ea4439f75e9d2636f706
SHA256

abd93796de9e8298d108883e92fc059a186b28dcb40db2b125020ec9ab77e9c3
SHA512

4620fdb6be1860e6da926c40a53c0000048d0f568a7fda9097f77c489e85b33e89b19d5580e7ed6bcc2050af772746a629cccbd8bd69067f36c5e994e71ae76b
SSDEEP

3072:Zl+E15SOCU/ekApe9kO1aNHZOvOTBfJ5GO:ZDSEs0kO0OvOTBC

Score

3^/10

Malware Config

Signatures

Unsigned PE 1 IoCs

Checks for missing Authenticode signature.

resource
zlib.dll

Files

zlib.dll
.dll windows:5 windows x86 arch:x86

8e801bce560f929b93424391817680b9

Headers

File Characteristics

IMAGE_FILE_EXECUTABLE_IMAGE
IMAGE_FILE_32BIT_MACHINE
IMAGE_FILE_DLL

Imports

kernel32

CreateFileA
SetFilePointer
WriteFile
ReadFile
GetLastError
CloseHandle
HeapFree
HeapAlloc
GetSystemTimeAsFileTime
GetCurrentThreadId
GetCommandLineA
EnterCriticalSection
LeaveCriticalSection
SetHandleCount
GetStdHandle
GetFileType
GetStartupInfoA
DeleteCriticalSection
TerminateProcess
GetCurrentProcess
UnhandledExceptionFilter
SetUnhandledExceptionFilter
IsDebuggerPresent
HeapCreate
HeapDestroy
VirtualFree
VirtualAlloc
HeapReAlloc
GetModuleHandleW
Sleep
GetProcAddress
ExitProcess
GetModuleFileNameA
TlsGetValue
TlsAlloc
TlsSetValue
TlsFree
InterlockedIncrement
SetLastError
InterlockedDecrement
WideCharToMultiByte
GetConsoleCP
GetConsoleMode
FlushFileBuffers
RtlUnwind
MultiByteToWideChar
FreeEnvironmentStringsA
GetEnvironmentStrings
FreeEnvironmentStringsW
GetEnvironmentStringsW
QueryPerformanceCounter
GetTickCount
GetCurrentProcessId
InitializeCriticalSectionAndSpinCount
GetCPInfo
GetACP
GetOEMCP
IsValidCodePage
LoadLibraryA
WriteConsoleA
GetConsoleOutputCP
WriteConsoleW
SetStdHandle
LCMapStringA
LCMapStringW
GetStringTypeA
GetStringTypeW
GetLocaleInfoA
HeapSize
SetEndOfFile
GetProcessHeap

Exports

Exports

adler32
compress
compress2
compressBound
crc32
deflate
deflateBound
deflateCopy
deflateEnd
deflateInit2_
deflateInit_
deflateParams
deflatePrime
deflateReset
deflateSetDictionary
fill_win32_filefunc
get_crc_table
gzclearerr
gzclose
gzdopen
gzeof
gzerror
gzflush
gzgetc
gzgets
gzopen
gzprintf
gzputc
gzputs
gzread
gzrewind
gzseek
gzsetparams
gztell
gzungetc
gzwrite
inflate
inflateBack
inflateBackEnd
inflateBackInit_
inflateCopy
inflateEnd
inflateInit2_
inflateInit_
inflateReset
inflateSetDictionary
inflateSync
inflateSyncPoint
uncompress
unzClose
unzCloseCurrentFile
unzGetCurrentFileInfo
unzGetFilePos
unzGetGlobalComment
unzGetGlobalInfo
unzGetLocalExtrafield
unzGoToFilePos
unzGoToFirstFile
unzGoToNextFile
unzLocateFile
unzOpen
unzOpen2
unzOpenCurrentFile
unzOpenCurrentFile2
unzOpenCurrentFile3
unzOpenCurrentFilePassword
unzReadCurrentFile
unzStringFileNameCompare
unzeof
unztell
zError
zipClose
zipCloseFileInZip
zipCloseFileInZipRaw
zipOpen
zipOpen2
zipOpenNewFileInZip
zipOpenNewFileInZip2
zipOpenNewFileInZip3
zipWriteInFileInZip
zlibCompileFlags
zlibVersion

Sections

.text
Size: 120KB - Virtual size: 119KB

IMAGE_SCN_CNT_CODE
IMAGE_SCN_MEM_EXECUTE
IMAGE_SCN_MEM_READ

.rdata
Size: 27KB - Virtual size: 26KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

.data
Size: 4KB - Virtual size: 11KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
IMAGE_SCN_MEM_WRITE

.rsrc
Size: 1024B - Virtual size: 880B

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

.reloc
Size: 5KB - Virtual size: 4KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ

Sharing

General

Malware Config

Signatures

Files

8e801bce560f929b93424391817680b9

Headers

File Characteristics

Imports

kernel32

Exports

Exports

Sections

.text Size: 120KB - Virtual size: 119KB

.rdata Size: 27KB - Virtual size: 26KB

.data Size: 4KB - Virtual size: 11KB

.rsrc Size: 1024B - Virtual size: 880B

.reloc Size: 5KB - Virtual size: 4KB

.text
Size: 120KB - Virtual size: 119KB

.rdata
Size: 27KB - Virtual size: 26KB

.data
Size: 4KB - Virtual size: 11KB

.rsrc
Size: 1024B - Virtual size: 880B

.reloc
Size: 5KB - Virtual size: 4KB