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Behavioral task
behavioral1
Sample
bulder.exe
Resource
win7-20240221-en
General
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Target
bulder.exe
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Size
228KB
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MD5
d8de90f21ece872c78887d8532bc4724
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SHA1
8abf63837160fe18efb7629ed630402cf9bcb361
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SHA256
11e06b3c4301175f96442f0295d9dfade52bf2e9712d2a84da3c54d4d4dd47b9
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SHA512
1c02c2560f8a198b0cea474a0b90ef9b5050a3ccbb242ed1600ddf149bb4166a85d69a66622b07884f4ad59e3da447b74e1682f9376ea8d1a54ae48c2776bc49
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SSDEEP
6144:xloZM+rIkd8g+EtXHkv/iD4F9KUw2xpaAPyAxVkjab8e1mci:DoZtL+EP8F9KUw2xpaAPyAxVkyG
Malware Config
Extracted
umbral
https://discord.com/api/webhooks/1211695583761408050/M3sBx75jnQ4OpdtOFVzvJ-JieS2qJbDuqhX6C2TEnMLmcYoKAYIyrKhhV1GYBHRI53rX
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 bulder.exe
Files
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bulder.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: 225KB - Virtual size: 225KB
IMAGE_SCN_CNT_CODE
IMAGE_SCN_MEM_EXECUTE
IMAGE_SCN_MEM_READ
.rsrc Size: 1KB - Virtual size: 1KB
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