General
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Target
mainloader.exe
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Size
3.1MB
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MD5
273ce3c64760b230f10d6e62d9528164
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SHA1
566595fcb762542d3e03c20f81ef1c75d9d7a96d
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SHA256
427a9817d50db6a7f0a4a6480c399b7e37413d2089891e6bedfed583da712284
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SHA512
011e13b915701048b4c2b8b77e2330dd0bed0f9a56f2cf1ef61e40782ba913acb53b60e200b66ab5b52c7e04d3a2c1f22d78a3824fc394c89f5cc2cb0a64848f
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SSDEEP
49152:LvyI22SsaNYfdPBldt698dBcjHr7/sdpUyoGdoSTHHB72eh2NT:Lvf22SsaNYfdPBldt6+dBcjHv/E
Malware Config
Extracted
quasar
1.4.1
Office04
192.168.0.189:4782
0cb31132-8966-4fde-b92b-e8c4d9af3b15
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encryption_key
C022D567101D14EE5E6DB20B2D111ED5DDE3BC6A
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install_name
Client.exe
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log_directory
Logs
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reconnect_delay
3000
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startup_key
Quasar Client Startup
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subdirectory
SubDir
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 mainloader.exe
Files
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mainloader.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