Analysis
-
max time kernel
130s -
max time network
142s -
platform
windows7_x64 -
resource
win7-20240221-en -
resource tags
arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system -
submitted
15-04-2024 08:38
Behavioral task
behavioral1
Sample
HEUR-Trojan.MSIL.Quasar.exe
Resource
win7-20240221-en
Behavioral task
behavioral2
Sample
HEUR-Trojan.MSIL.Quasar.exe
Resource
win10v2004-20240412-en
General
-
Target
HEUR-Trojan.MSIL.Quasar.exe
-
Size
3.4MB
-
MD5
a585d666df5ca83eabcd06a4f0364523
-
SHA1
4f5d8d09aaaf33efda276c3f7ab9883eda146da6
-
SHA256
788c859458ab91850978e27a2591b564e5e3200eede844362bf465944db9d92c
-
SHA512
4cd1aa6c0c15264cf00feed59552e6bd1ce663af54d5fe27ac193d8af77abd23522938166ec0318482dbee6c78a6cc97f1e75a1ea148390da7c2aee6a3bca544
-
SSDEEP
49152:qvFt62XlaSFNWPjljiFa2RoUYIe5UU88DoGdWTHHB72eh2NTF:qv362XlaSFNWPjljiFXRoUYIIUU8E9
Malware Config
Extracted
quasar
1.4.1
Office04
85.219.48.223:6969
dd7993dd-3ead-48cf-ab1a-635718753276
-
encryption_key
DC9E2A3C163F32C37AC47FC14DF7F94F33786801
-
install_name
Client.exe
-
log_directory
Logs
-
reconnect_delay
3000
-
startup_key
:)
-
subdirectory
SubDir
Signatures
-
Quasar payload 3 IoCs
Processes:
resource yara_rule behavioral1/memory/1056-0-0x0000000001370000-0x00000000016D6000-memory.dmp family_quasar C:\Users\Admin\AppData\Roaming\SubDir\Client.exe family_quasar behavioral1/memory/2544-9-0x0000000000300000-0x0000000000666000-memory.dmp family_quasar -
Detects Windows executables referencing non-Windows User-Agents 3 IoCs
Processes:
resource yara_rule behavioral1/memory/1056-0-0x0000000001370000-0x00000000016D6000-memory.dmp INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA C:\Users\Admin\AppData\Roaming\SubDir\Client.exe INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA behavioral1/memory/2544-9-0x0000000000300000-0x0000000000666000-memory.dmp INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA -
Detects binaries (Windows and macOS) referencing many web browsers. Observed in information stealers. 3 IoCs
Processes:
resource yara_rule behavioral1/memory/1056-0-0x0000000001370000-0x00000000016D6000-memory.dmp INDICATOR_SUSPICIOUS_Binary_References_Browsers C:\Users\Admin\AppData\Roaming\SubDir\Client.exe INDICATOR_SUSPICIOUS_Binary_References_Browsers behavioral1/memory/2544-9-0x0000000000300000-0x0000000000666000-memory.dmp INDICATOR_SUSPICIOUS_Binary_References_Browsers -
Detects executables containing common artifacts observed in infostealers 3 IoCs
Processes:
resource yara_rule behavioral1/memory/1056-0-0x0000000001370000-0x00000000016D6000-memory.dmp INDICATOR_SUSPICIOUS_GENInfoStealer C:\Users\Admin\AppData\Roaming\SubDir\Client.exe INDICATOR_SUSPICIOUS_GENInfoStealer behavioral1/memory/2544-9-0x0000000000300000-0x0000000000666000-memory.dmp INDICATOR_SUSPICIOUS_GENInfoStealer -
Executes dropped EXE 1 IoCs
Processes:
Client.exepid process 2544 Client.exe -
Adds Run key to start application 2 TTPs 2 IoCs
Processes:
HEUR-Trojan.MSIL.Quasar.exeClient.exedescription ioc process Set value (str) \REGISTRY\USER\S-1-5-21-406356229-2805545415-1236085040-1000\Software\Microsoft\Windows\CurrentVersion\Run\:) = "\"C:\\Users\\Admin\\AppData\\Roaming\\SubDir\\Client.exe\"" HEUR-Trojan.MSIL.Quasar.exe Set value (str) \REGISTRY\USER\S-1-5-21-406356229-2805545415-1236085040-1000\Software\Microsoft\Windows\CurrentVersion\Run\:) = "\"C:\\Users\\Admin\\AppData\\Roaming\\SubDir\\Client.exe\"" 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 2504 schtasks.exe 2612 schtasks.exe -
Suspicious use of AdjustPrivilegeToken 2 IoCs
Processes:
HEUR-Trojan.MSIL.Quasar.exeClient.exedescription pid process Token: SeDebugPrivilege 1056 HEUR-Trojan.MSIL.Quasar.exe Token: SeDebugPrivilege 2544 Client.exe -
Suspicious use of FindShellTrayWindow 1 IoCs
Processes:
Client.exepid process 2544 Client.exe -
Suspicious use of SendNotifyMessage 1 IoCs
Processes:
Client.exepid process 2544 Client.exe -
Suspicious use of WriteProcessMemory 9 IoCs
Processes:
HEUR-Trojan.MSIL.Quasar.exeClient.exedescription pid process target process PID 1056 wrote to memory of 2504 1056 HEUR-Trojan.MSIL.Quasar.exe schtasks.exe PID 1056 wrote to memory of 2504 1056 HEUR-Trojan.MSIL.Quasar.exe schtasks.exe PID 1056 wrote to memory of 2504 1056 HEUR-Trojan.MSIL.Quasar.exe schtasks.exe PID 1056 wrote to memory of 2544 1056 HEUR-Trojan.MSIL.Quasar.exe Client.exe PID 1056 wrote to memory of 2544 1056 HEUR-Trojan.MSIL.Quasar.exe Client.exe PID 1056 wrote to memory of 2544 1056 HEUR-Trojan.MSIL.Quasar.exe Client.exe PID 2544 wrote to memory of 2612 2544 Client.exe schtasks.exe PID 2544 wrote to memory of 2612 2544 Client.exe schtasks.exe PID 2544 wrote to memory of 2612 2544 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
-
C:\Users\Admin\AppData\Local\Temp\HEUR-Trojan.MSIL.Quasar.exe"C:\Users\Admin\AppData\Local\Temp\HEUR-Trojan.MSIL.Quasar.exe"1⤵
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1056 -
C:\Windows\system32\schtasks.exe"schtasks" /create /tn ":)" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f2⤵
- Creates scheduled task(s)
PID:2504 -
C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"2⤵
- Executes dropped EXE
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:2544 -
C:\Windows\system32\schtasks.exe"schtasks" /create /tn ":)" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\Client.exe" /rl HIGHEST /f3⤵
- Creates scheduled task(s)
PID:2612
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
Loading Replay Monitor...
Downloads
-
Filesize
3.4MB
MD5a585d666df5ca83eabcd06a4f0364523
SHA14f5d8d09aaaf33efda276c3f7ab9883eda146da6
SHA256788c859458ab91850978e27a2591b564e5e3200eede844362bf465944db9d92c
SHA5124cd1aa6c0c15264cf00feed59552e6bd1ce663af54d5fe27ac193d8af77abd23522938166ec0318482dbee6c78a6cc97f1e75a1ea148390da7c2aee6a3bca544