b64[.]exe | Triage

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General

Target

b64.exe
Size

4KB
MD5

104831d5a032799ae9fd6b721d625bd9
SHA1

cdca2b9c01d70b31b7aaafd9c17040026264c150
SHA256

ca8c0eff3c06b2ca40ee8818295dc2697091999dd1e402e7502f9d07c2e80476
SHA512

fe30dd049761e823b133bec151f208fade11217c7b957ff79e4d8bf784a49c59a813e5942e4cdcea116d13e32a5716c7e6a1bbd5eac3f73b3bf648570bad45fe
SSDEEP

96:jDgYsAeE4d9SLF3lOktUrZHXKB1xMhl8iUu4w:jDPP4d9sfvtw96Xqa1w

Score

7^/10

upx

Malware Config

Signatures

UPX packed file 1 IoCs

Detects executables packed with UPX/modified UPX open source packer.

resource	yara_rule
sample	upx

Unsigned PE 2 IoCs

Checks for missing Authenticode signature.

resource
b64.exe
unpack001/out.upx

Files

b64.exe
.exe windows:4 windows x86 arch:x86

Password: infected

Headers

File Characteristics

IMAGE_FILE_RELOCS_STRIPPED
IMAGE_FILE_EXECUTABLE_IMAGE
IMAGE_FILE_LINE_NUMS_STRIPPED
IMAGE_FILE_LOCAL_SYMS_STRIPPED
IMAGE_FILE_32BIT_MACHINE
IMAGE_FILE_DEBUG_STRIPPED

Sections

UPX0
Size: - Virtual size: 12KB

IMAGE_SCN_CNT_UNINITIALIZED_DATA
IMAGE_SCN_MEM_EXECUTE
IMAGE_SCN_MEM_READ
IMAGE_SCN_MEM_WRITE

UPX1
Size: 3KB - Virtual size: 4KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_EXECUTE
IMAGE_SCN_MEM_READ
IMAGE_SCN_MEM_WRITE

UPX2
Size: 512B - Virtual size: 4KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
IMAGE_SCN_MEM_WRITE
out.upx
.exe windows:4 windows x86 arch:x86

Headers

File Characteristics

IMAGE_FILE_RELOCS_STRIPPED
IMAGE_FILE_EXECUTABLE_IMAGE
IMAGE_FILE_LINE_NUMS_STRIPPED
IMAGE_FILE_LOCAL_SYMS_STRIPPED
IMAGE_FILE_32BIT_MACHINE
IMAGE_FILE_DEBUG_STRIPPED

Exports

Exports

__fini_array_end
__fini_array_start
__init_array_end
__init_array_start
__preinit_array_end
__preinit_array_start
_edata
_end
_etext
_start
main

Sections

.text
Size: 4KB - Virtual size: 3KB

IMAGE_SCN_CNT_CODE
IMAGE_SCN_MEM_EXECUTE
IMAGE_SCN_MEM_READ

.data
Size: 2KB - Virtual size: 2KB

IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
IMAGE_SCN_MEM_WRITE