Analysis
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max time kernel
147s -
max time network
155s -
platform
windows10-2004_x64 -
resource
win10v2004-20240226-en -
resource tags
arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system -
submitted
20-04-2024 17:57
Behavioral task
behavioral1
Sample
Windows Remote Access Trojan.exe
Resource
win7-20240221-en
General
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Target
Windows Remote Access Trojan.exe
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Size
3.1MB
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MD5
2c2172ccafa055a00312e4e3a08f229a
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SHA1
1c9dd30693318258d8ffd70984cb348d755c5d97
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SHA256
19b707de920bf77466108ba32a3d4b01fe051f46173db4bbf65c9e17895d9f55
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SHA512
ceecdee4cdb348a59f7b918b7c1d641e6ac398601493d87e1c91128387664effb457256cec427f71686cda808418003c8dc01ae9b22cb6ce76338237e5213225
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SSDEEP
49152:3vyI22SsaNYfdPBldt698dBcjHlqUMrtMfl5oGdBZTHHB72eh2NT:3vf22SsaNYfdPBldt6+dBcjHlrMrw
Malware Config
Extracted
quasar
1.4.1
Office04
192.168.1.154:4782
ba502bba-c1c8-4a0b-95e6-4b1a3d5f551e
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encryption_key
7195172212FD0C3E2300AE89FC3318C365A0CFF8
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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 payload 2 IoCs
Processes:
resource yara_rule behavioral2/memory/4300-0-0x00000000001C0000-0x00000000004E4000-memory.dmp family_quasar C:\Users\Admin\AppData\Roaming\SubDir\Client.exe family_quasar -
Executes dropped EXE 1 IoCs
Processes:
Client.exepid process 1136 Client.exe -
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 2940 schtasks.exe 3004 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
Windows Remote Access Trojan.exeClient.exedescription pid process Token: SeDebugPrivilege 4300 Windows Remote Access Trojan.exe Token: SeDebugPrivilege 1136 Client.exe -
Suspicious use of SetWindowsHookEx 1 IoCs
Processes:
Client.exepid process 1136 Client.exe -
Suspicious use of WriteProcessMemory 6 IoCs
Processes:
Windows Remote Access Trojan.exeClient.exedescription pid process target process PID 4300 wrote to memory of 2940 4300 Windows Remote Access Trojan.exe schtasks.exe PID 4300 wrote to memory of 2940 4300 Windows Remote Access Trojan.exe schtasks.exe PID 4300 wrote to memory of 1136 4300 Windows Remote Access Trojan.exe Client.exe PID 4300 wrote to memory of 1136 4300 Windows Remote Access Trojan.exe Client.exe PID 1136 wrote to memory of 3004 1136 Client.exe schtasks.exe PID 1136 wrote to memory of 3004 1136 Client.exe schtasks.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\Windows Remote Access Trojan.exe"C:\Users\Admin\AppData\Local\Temp\Windows Remote Access Trojan.exe"1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4300 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
PID:2940 -
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1136 -
C:\Windows\SYSTEM32\schtasks.exe"schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
PID:3004
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C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=3784 --field-trial-handle=2244,i,11878111470816612087,2265290141962607370,262144 --variations-seed-version /prefetch:81⤵PID:1212
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
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Filesize
3.1MB
MD52c2172ccafa055a00312e4e3a08f229a
SHA11c9dd30693318258d8ffd70984cb348d755c5d97
SHA25619b707de920bf77466108ba32a3d4b01fe051f46173db4bbf65c9e17895d9f55
SHA512ceecdee4cdb348a59f7b918b7c1d641e6ac398601493d87e1c91128387664effb457256cec427f71686cda808418003c8dc01ae9b22cb6ce76338237e5213225