General
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Target
CrypticBootstrapper.exe
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Size
234KB
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MD5
382b946582beaad5ee5c50ac21d0ded1
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SHA1
26ab22955ed978b232503e710a226c8f9332c835
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SHA256
587849a5a71af2928ecc82f0fa9f405b898e69d1c93e6d7102f29a38abf988eb
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SHA512
bab1487bfd8f10753a4022336c026fb3e8f77cae371d0a8c861c36c4e1c101c999b4ec46dac55f01439d74441e86fdb30ae9dfb7bf6fd60b3c12f5f9103e0c80
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SSDEEP
6144:zloZMLrIkd8g+EtXHkv/iD4xI/s48e1mF0i:xoZ0L+EP8xgO9
Malware Config
Extracted
umbral
https://discord.com/api/webhooks/1335977142105805066/saBJFpemhgpqIhPO9s0jhP8iTAqE0d3R-z8FkBfVvQQdRG1xCG5fraYk08OjbsNg8dZz
Signatures
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Detect Umbral payload 1 IoCs
resource yara_rule sample family_umbral -
Umbral family
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Unsigned PE 1 IoCs
Checks for missing Authenticode signature.
resource CrypticBootstrapper.exe
Files
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CrypticBootstrapper.exe.exe windows:4 windows x86 arch:x86
f34d5f2d4577ed6d9ceec516c1f5a744
Headers
DLL Characteristics
IMAGE_DLLCHARACTERISTICS_HIGH_ENTROPY_VA
IMAGE_DLLCHARACTERISTICS_DYNAMIC_BASE
IMAGE_DLLCHARACTERISTICS_NX_COMPAT
IMAGE_DLLCHARACTERISTICS_NO_SEH
IMAGE_DLLCHARACTERISTICS_TERMINAL_SERVER_AWARE
File Characteristics
IMAGE_FILE_EXECUTABLE_IMAGE
IMAGE_FILE_LARGE_ADDRESS_AWARE
IMAGE_FILE_32BIT_MACHINE
Imports
mscoree
_CorExeMain
Sections
.text Size: 227KB - Virtual size: 226KB
IMAGE_SCN_CNT_CODE
IMAGE_SCN_MEM_EXECUTE
IMAGE_SCN_MEM_READ
.rsrc Size: 6KB - Virtual size: 5KB
IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_READ
.reloc Size: 512B - Virtual size: 12B
IMAGE_SCN_CNT_INITIALIZED_DATA
IMAGE_SCN_MEM_DISCARDABLE
IMAGE_SCN_MEM_READ