Analysis
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max time kernel
92s -
max time network
121s -
platform
windows10-2004_x64 -
resource
win10v2004-20231215-en -
resource tags
arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system -
submitted
28-03-2024 19:17
Behavioral task
behavioral1
Sample
Client-built.exe
Resource
win7-20240221-en
General
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Target
Client-built.exe
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Size
3.1MB
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MD5
bb7a42f4595499e4cd801eacb252cae8
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SHA1
bd19e59cd8203d29fa232ea026189d245e07e886
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SHA256
f1360aa4d9adeff9ccff753f2996be1b827d7bc3a79549cc6635346ce3eb1da2
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SHA512
29f160c2a84e8b3dd86ba62e65e8d91d782f7b347900eb72198012af40353986e2ce01a85cbf288a6146192cdb12450e0ec72024a675509ee6c9e6d089bb2449
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SSDEEP
49152:mvRuf2NUaNmwzPWlvdaKM7ZxTwkQRJ6FbR3LoGd/ITHHB72eh2NT:mvsf2NUaNmwzPWlvdaB7ZxTwkQRJ6X
Malware Config
Extracted
quasar
1.4.1
Slave
140.238.91.110:38899
uk2.localto.net:38899:38899
276d9dc6-b19c-4958-8ac3-89586bd3b515
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encryption_key
ABCF70C37D1A79A01712038122D1532DF20DF72A
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install_name
Client.exe
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log_directory
Error Logs
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reconnect_delay
3000
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startup_key
WOS64
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subdirectory
Windows
Signatures
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Quasar payload 2 IoCs
Processes:
resource yara_rule behavioral2/memory/4980-0-0x0000000000C30000-0x0000000000F54000-memory.dmp family_quasar C:\Users\Admin\AppData\Roaming\Windows\Client.exe family_quasar -
Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
Processes:
Client.exedescription ioc process Key value queried \REGISTRY\USER\S-1-5-21-1497073144-2389943819-3385106915-1000\Control Panel\International\Geo\Nation Client.exe -
Executes dropped EXE 1 IoCs
Processes:
Client.exepid process 1072 Client.exe -
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
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Creates scheduled task(s) 1 TTPs 2 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
Processes:
schtasks.exeschtasks.exepid process 3328 schtasks.exe 4832 schtasks.exe -
Runs ping.exe 1 TTPs 1 IoCs
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Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
Client-built.exeClient.exedescription pid process Token: SeDebugPrivilege 4980 Client-built.exe Token: SeDebugPrivilege 1072 Client.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
Processes:
Client.exepid process 1072 Client.exe -
Suspicious use of WriteProcessMemory 14 IoCs
Processes:
Client-built.exeClient.execmd.exedescription pid process target process PID 4980 wrote to memory of 3328 4980 Client-built.exe schtasks.exe PID 4980 wrote to memory of 3328 4980 Client-built.exe schtasks.exe PID 4980 wrote to memory of 1072 4980 Client-built.exe Client.exe PID 4980 wrote to memory of 1072 4980 Client-built.exe Client.exe PID 1072 wrote to memory of 4832 1072 Client.exe schtasks.exe PID 1072 wrote to memory of 4832 1072 Client.exe schtasks.exe PID 1072 wrote to memory of 4504 1072 Client.exe schtasks.exe PID 1072 wrote to memory of 4504 1072 Client.exe schtasks.exe PID 1072 wrote to memory of 4080 1072 Client.exe cmd.exe PID 1072 wrote to memory of 4080 1072 Client.exe cmd.exe PID 4080 wrote to memory of 5012 4080 cmd.exe chcp.com PID 4080 wrote to memory of 5012 4080 cmd.exe chcp.com PID 4080 wrote to memory of 1472 4080 cmd.exe PING.EXE PID 4080 wrote to memory of 1472 4080 cmd.exe PING.EXE -
Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
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:4980 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "WOS64" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows\Client.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
PID:3328 -
C:\Users\Admin\AppData\Roaming\Windows\Client.exe"C:\Users\Admin\AppData\Roaming\Windows\Client.exe"2⤵
- Checks computer location settings
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1072 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "WOS64" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows\Client.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
PID:4832 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /delete /tn "WOS64" /f3⤵PID:4504
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\77GIQXDhHRTK.bat" "3⤵
- Suspicious use of WriteProcessMemory
PID:4080 -
C:\Windows\system32\chcp.comchcp 650014⤵PID:5012
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C:\Windows\system32\PING.EXEping -n 10 localhost4⤵
- Runs ping.exe
PID:1472
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
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C:\Users\Admin\AppData\Local\Temp\77GIQXDhHRTK.batFilesize
212B
MD5c4f63a3b88830a570fa7e342e55f5c44
SHA1ae0a83affba4ca95c32ee9282afbc875f95c5571
SHA256bf105130f3739c55231a212f291942da3538a4e4836d50103063f11af4295296
SHA512c3ab5c421892c64dc0da822906692d9c5bb44f90bc0c5317d281356d1f6aa3ec031504d2b26dd039d545a7fdf1953fc9243a45e546bb3f4112a6f134598aec28
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C:\Users\Admin\AppData\Roaming\Windows\Client.exeFilesize
3.1MB
MD5bb7a42f4595499e4cd801eacb252cae8
SHA1bd19e59cd8203d29fa232ea026189d245e07e886
SHA256f1360aa4d9adeff9ccff753f2996be1b827d7bc3a79549cc6635346ce3eb1da2
SHA51229f160c2a84e8b3dd86ba62e65e8d91d782f7b347900eb72198012af40353986e2ce01a85cbf288a6146192cdb12450e0ec72024a675509ee6c9e6d089bb2449
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memory/1072-11-0x000000001AE10000-0x000000001AE20000-memory.dmpFilesize
64KB
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memory/1072-10-0x00007FFEC48E0000-0x00007FFEC53A1000-memory.dmpFilesize
10.8MB
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memory/1072-12-0x000000001BA00000-0x000000001BA50000-memory.dmpFilesize
320KB
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memory/1072-13-0x000000001BB10000-0x000000001BBC2000-memory.dmpFilesize
712KB
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memory/1072-16-0x000000001BAC0000-0x000000001BAD2000-memory.dmpFilesize
72KB
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memory/1072-17-0x000000001C650000-0x000000001C68C000-memory.dmpFilesize
240KB
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memory/1072-18-0x00007FFEC48E0000-0x00007FFEC53A1000-memory.dmpFilesize
10.8MB
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memory/1072-19-0x000000001AE10000-0x000000001AE20000-memory.dmpFilesize
64KB
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memory/1072-25-0x00007FFEC48E0000-0x00007FFEC53A1000-memory.dmpFilesize
10.8MB
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memory/4980-2-0x000000001BE60000-0x000000001BE70000-memory.dmpFilesize
64KB
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memory/4980-9-0x00007FFEC48E0000-0x00007FFEC53A1000-memory.dmpFilesize
10.8MB
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memory/4980-0-0x0000000000C30000-0x0000000000F54000-memory.dmpFilesize
3.1MB
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memory/4980-1-0x00007FFEC48E0000-0x00007FFEC53A1000-memory.dmpFilesize
10.8MB