Behavioral task
behavioral1
Sample
Client-built.exe
Resource
win10-20240319-en
Behavioral task
behavioral2
Sample
Client-built.exe
Resource
win10v2004-20240319-en
General
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Target
Client-built.exe
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Size
3.1MB
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MD5
57045c2bf3377b12aa5abce21cc0a99d
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SHA1
217202ed404f25fc550ad70fd7066b0fe8773ef9
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SHA256
f2e04196e1353ad216e077e0aeb2e1ab8ee93b8b16b205422b4cc6d8adc50cc2
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SHA512
9ab46cc194eeaabb75777457a01328f5a8d2ebf604efba0623575cf25c04e206e416ee72db17e3c92a9d363330f82fa3ce2aac64c2a4a61d4dce34d79b73366e
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SSDEEP
49152:Wv+I22SsaNYfdPBldt698dBcjHukuQPoGdhEQTHHB72eh2NT:Wvz22SsaNYfdPBldt6+dBcjHukuE
Malware Config
Extracted
quasar
1.4.1
Ratted
140.238.91.110:44867
be049c71-d631-4f68-8b3e-8e01081f2340
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encryption_key
AA883CE7347A3543F81EBCDE3BBF3BFC9C60344E
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install_name
WOS64UPD.exe
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log_directory
Windows Update Logs
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reconnect_delay
3000
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startup_key
Windows Updater
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subdirectory
Windows
Signatures
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Quasar family
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Quasar payload 1 IoCs
resource yara_rule sample family_quasar -
Unsigned PE 1 IoCs
Checks for missing Authenticode signature.
resource Client-built.exe
Files
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Client-built.exe.exe windows:4 windows x86 arch:x86
f34d5f2d4577ed6d9ceec516c1f5a744
Headers
DLL Characteristics
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_32BIT_MACHINE
Imports
mscoree
_CorExeMain
Sections
.text Size: 3.1MB - Virtual size: 3.1MB
IMAGE_SCN_CNT_CODE
IMAGE_SCN_MEM_EXECUTE
IMAGE_SCN_MEM_READ
.rsrc Size: 3KB - Virtual size: 2KB
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