Behavioral task
behavioral1
Sample
Umbral.builder.exe
Resource
win7-20240221-en
General
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Target
Umbral.builder.exe
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Size
227KB
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MD5
322135f613ef605e98df134458cc4753
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SHA1
7c573533103f0dac7d907478e3ece5d0d171d679
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SHA256
56fc44d67e6f5da9d9a9aff9c07826b9680f3b0211eddd0b5a1e49d458bce46f
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SHA512
ab85dd153a591a5f359d47b55fee57b84fe0bd6c5a7ef0e3f128e95ee176d0dccb695cd577f1e8f278ed4eb75056a90af48d32c74825f49918e4ac65cc47376f
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SSDEEP
6144:+loZM+rIkd8g+EtXHkv/iD48G4oIuphCyn6opNsw8b8e1mcLi:ooZtL+EP88G4oIuphCyn6opNsh7G
Malware Config
Extracted
umbral
https://discord.com/api/webhooks/1209763682318557214/iw1kcrYxifMARxXRUyTIbdu-F65uDMzIXFK1VOLm0qjLHdg6yNpLURGupP0dQiCCxDnn
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 Umbral.builder.exe
Files
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Umbral.builder.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: 224KB - Virtual size: 224KB
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