zlib1[.]dll | Triage

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General

Target

zlib1.dll
Size

87KB
MD5

e41ecfc449d19b97b821337db437da5b
SHA1

042564c4f387e1c55d470397b813784b247bdd7c
SHA256

e6441119948584dcde66a2fbe8f3049032e42c34aac69812df05fd2cbd0e7713
SHA512

a0004b374678373aa91538ca4cd3b14bc4dab094fb2d0f654c31bedfe25d61f59af5f33aea27dd555287e3db5f4db6b8c12c397bc59f62457c176ad38bda4251
SSDEEP

1536:GPnNzhp2ekfS6pFOYx/Q7ScrnSIOcIOy9kLPcz:GfNzX2/fS6pFJzwnwSy9kLPcz

Score

3^/10

Malware Config

Signatures

Unsigned PE 1 IoCs

Checks for missing Authenticode signature.

resource
zlib1.dll

Files

zlib1.dll
.dll windows x64

d879d2294039900ef484e0f01607f882

Headers

DLL Characteristics

IMAGE_DLLCHARACTERISTICS_HIGH_ENTROPY_VA
IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE
IMAGE_DLLCHARACTERISTICS_NX_COMPAT

File Characteristics

IMAGE_FILE_EXECUTABLE_IMAGE
IMAGE_FILE_LARGE_ADDRESS_AWARE
IMAGE_FILE_DLL

Imports

vcruntime140

__std_type_info_destroy_list
__C_specific_handler
memmove
memchr
memset
memcpy

api-ms-win-crt-stdio-l1-1-0

_wopen
_write
_read
_close
__stdio_common_vsprintf
_open
_lseeki64

api-ms-win-crt-heap-l1-1-0

malloc
free

api-ms-win-crt-convert-l1-1-0

wcstombs

api-ms-win-crt-runtime-l1-1-0

_errno
strerror
_execute_onexit_table
_initialize_onexit_table
_initialize_narrow_environment
_configure_narrow_argv
_seh_filter_dll
_initterm_e
_initterm
_cexit

kernel32

DisableThreadLibraryCalls
RtlLookupFunctionEntry
RtlVirtualUnwind
UnhandledExceptionFilter
SetUnhandledExceptionFilter
GetCurrentProcess
TerminateProcess
IsProcessorFeaturePresent
IsDebuggerPresent
InitializeSListHead
RtlCaptureContext
GetSystemTimeAsFileTime
GetCurrentThreadId
GetCurrentProcessId
QueryPerformanceCounter

Exports

Exports

adler32
adler32_combine
adler32_z
compress
compress2
compressBound
crc32
crc32_combine
crc32_combine_gen
crc32_combine_op
crc32_z
deflate
deflateBound
deflateCopy
deflateEnd
deflateGetDictionary
deflateInit2_
deflateInit_
deflateParams
deflatePending
deflatePrime
deflateReset
deflateResetKeep
deflateSetDictionary
deflateSetHeader
deflateTune
get_crc_table
gzbuffer
gzclearerr
gzclose
gzclose_r
gzclose_w
gzdirect
gzdopen
gzeof
gzerror
gzflush
gzfread
gzfwrite
gzgetc
gzgetc_
gzgets
gzoffset
gzoffset64
gzopen
gzopen64
gzopen_w
gzprintf
gzputc
gzputs
gzread
gzrewind
gzseek
gzseek64
gzsetparams
gztell
gztell64
gzungetc
gzvprintf
gzwrite
inflate
inflateBack
inflateBackEnd
inflateBackInit_
inflateCodesUsed
inflateCopy
inflateEnd
inflateGetDictionary
inflateGetHeader
inflateInit2_
inflateInit_
inflateMark
inflatePrime
inflateReset
inflateReset2
inflateResetKeep
inflateSetDictionary
inflateSync
inflateSyncPoint
inflateUndermine
inflateValidate
uncompress
uncompress2
zError
zlibCompileFlags
zlibVersion

Sections

.text
Size: 53KB - Virtual size: 53KB

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: 512B - Virtual size: 1KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
IMAGE_SCN_MEM_WRITE

.pdata
Size: 3KB - Virtual size: 2KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

.rsrc
Size: 1KB - Virtual size: 1KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ

.reloc
Size: 512B - Virtual size: 108B

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ

Sharing

General

Malware Config

Signatures

Files

d879d2294039900ef484e0f01607f882

Headers

DLL Characteristics

File Characteristics

Imports

vcruntime140

api-ms-win-crt-stdio-l1-1-0

api-ms-win-crt-heap-l1-1-0

api-ms-win-crt-convert-l1-1-0

api-ms-win-crt-runtime-l1-1-0

kernel32

Exports

Exports

Sections

.text Size: 53KB - Virtual size: 53KB

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

.data Size: 512B - Virtual size: 1KB

.pdata Size: 3KB - Virtual size: 2KB

.rsrc Size: 1KB - Virtual size: 1KB

.reloc Size: 512B - Virtual size: 108B

.text
Size: 53KB - Virtual size: 53KB

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

.data
Size: 512B - Virtual size: 1KB

.pdata
Size: 3KB - Virtual size: 2KB

.rsrc
Size: 1KB - Virtual size: 1KB

.reloc
Size: 512B - Virtual size: 108B