Analysis
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max time kernel
150s -
max time network
158s -
platform
windows10-2004_x64 -
resource
win10v2004-20240730-en -
resource tags
arch:x64arch:x86image:win10v2004-20240730-enlocale:en-usos:windows10-2004-x64system -
submitted
02-08-2024 07:53
General
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Target
Client-built.exe
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Size
3.1MB
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MD5
89211e15b473db84cfd447e3dbb4fdcd
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SHA1
1d861ff885aa2cd8dc11f01f1a0d202410349fa3
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SHA256
84a0907e7e112b593f99f0a7440eb3d74e71bf7dfe19d27c298a28042acf5e19
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SHA512
5fc2f8f646732efc65ab6d9cb94e9365d241f22fd30e586d8524bde3d7c37d700d32e0bae2faf762b75e98a3d799747f45cd724c2cadc36085645c7a97bcd671
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SSDEEP
49152:rvnI22SsaNYfdPBldt698dBcjHbfUu1vcLoGCITHHB72eh2NT:rvI22SsaNYfdPBldt6+dBcjHbfUx
Malware Config
Extracted
quasar
1.4.1
Office04
95.103.111.116:4782
e1248b94-1e99-492a-b8c9-74b76d805a67
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encryption_key
7661CB0AB05BF4FD5649849C60F4B3FADAEED859
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install_name
test.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 payload 2 IoCs
Processes:
resource yara_rule behavioral1/memory/4840-1-0x0000000000970000-0x0000000000C94000-memory.dmp family_quasar C:\Users\Admin\AppData\Roaming\SubDir\test.exe family_quasar -
Executes dropped EXE 1 IoCs
Processes:
test.exepid process 2948 test.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
Client-built.exetest.exedescription pid process Token: SeDebugPrivilege 4840 Client-built.exe Token: SeDebugPrivilege 2948 test.exe -
Suspicious use of FindShellTrayWindow 1 IoCs
Processes:
test.exepid process 2948 test.exe -
Suspicious use of SendNotifyMessage 1 IoCs
Processes:
test.exepid process 2948 test.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
Processes:
test.exepid process 2948 test.exe -
Suspicious use of WriteProcessMemory 2 IoCs
Processes:
Client-built.exedescription pid process target process PID 4840 wrote to memory of 2948 4840 Client-built.exe test.exe PID 4840 wrote to memory of 2948 4840 Client-built.exe test.exe
Processes
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C:\Users\Admin\AppData\Local\Temp\Client-built.exe"C:\Users\Admin\AppData\Local\Temp\Client-built.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4840 -
C:\Users\Admin\AppData\Roaming\SubDir\test.exe"C:\Users\Admin\AppData\Roaming\SubDir\test.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of SetWindowsHookEx
PID:2948
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C:\Windows\System32\rundll32.exeC:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding1⤵PID:5088
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C:\Windows\system32\svchost.exeC:\Windows\system32\svchost.exe -k LocalService -p -s fdPHost1⤵PID:4928
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
3.1MB
MD589211e15b473db84cfd447e3dbb4fdcd
SHA11d861ff885aa2cd8dc11f01f1a0d202410349fa3
SHA25684a0907e7e112b593f99f0a7440eb3d74e71bf7dfe19d27c298a28042acf5e19
SHA5125fc2f8f646732efc65ab6d9cb94e9365d241f22fd30e586d8524bde3d7c37d700d32e0bae2faf762b75e98a3d799747f45cd724c2cadc36085645c7a97bcd671