Analysis
- max time kernel
141s - max time network
123s - platform
windows10-2004_x64 - resource
win10v2004-20240412-en - resource tags
- submitted
25/04/2024, 05:45
General
- Target krummy-lavacrypt-gfhd.exe
- Size 3.5MB
- Sample240425-gf2eaagc53
- SHA256 28b7e5568fcbab776e1bbb1be485a4299a760240fe4b1c60cb3ce68a0e0c4ba6
Malware Config
Extracted
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quasar
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1.4.1
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Slave
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157.20.182.46:4782
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a5764ae9-1c39-4533-95ca-a5d90dae860a
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encryption_key
BA20F732417E96C201B42F315FAD6CF773D77589
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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
Client
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subdirectory
SubDir
Signatures
- Quasar RAT
Quasar is an open source Remote Access Tool.
- Quasar payload 1 IoCs
- UAC bypass 3 TTPs 1 IoCs
- Windows security bypass 2 TTPs 2 IoCs
- Looks for VirtualBox Guest Additions in registry 2 TTPs 2 IoCs
- Looks for VMWare Tools registry key 2 TTPs 2 IoCs
- Checks BIOS information in registry 2 TTPs 4 IoCs
BIOS information is often read in order to detect sandboxing environments.
- Checks computer location settings 2 TTPs 2 IoCs
Looks up country code configured in the registry, likely geofence.
- Executes dropped EXE 2 IoCs
- Windows security modification 2 TTPs 3 IoCs
- Adds Run key to start application 2 TTPs 1 IoCs
- Checks whether UAC is enabled 1 TTPs 2 IoCs
- Maps connected drives based on registry 3 TTPs 4 IoCs
Disk information is often read in order to detect sandboxing environments.
- Suspicious use of SetThreadContext 1 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Delays execution with timeout.exe 1 IoCs
- Suspicious behavior: EnumeratesProcesses 26 IoCs
- Suspicious use of AdjustPrivilegeToken 4 IoCs
- Suspicious use of WriteProcessMemory 23 IoCs
- System policy modification 1 TTPs 1 IoCs
- 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\krummy-lavacrypt-gfhd.exe"C:\Users\Admin\AppData\Local\Temp\krummy-lavacrypt-gfhd.exe"1⤵
- Looks for VirtualBox Guest Additions in registry
- Looks for VMWare Tools registry key
- Checks BIOS information in registry
- Checks computer location settings
- Adds Run key to start application
- Maps connected drives based on registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Roaming\svchost.exe"' & exit2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\schtasks.exeschtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Roaming\svchost.exe"'3⤵
- Creates scheduled task(s)
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp594B.tmp.bat""2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\timeout.exetimeout 33⤵
- Delays execution with timeout.exe
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C:\Users\Admin\AppData\Roaming\svchost.exe"C:\Users\Admin\AppData\Roaming\svchost.exe"3⤵
- UAC bypass
- Windows security bypass
- Looks for VirtualBox Guest Additions in registry
- Looks for VMWare Tools registry key
- Checks BIOS information in registry
- Checks computer location settings
- Executes dropped EXE
- Windows security modification
- Checks whether UAC is enabled
- Maps connected drives based on registry
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- System policy modification
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C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\svchost.exe" -Force4⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe"C:\Windows\Microsoft.NET\Framework\v4.0.30319\msbuild.exe"4⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"C:\Users\Admin\AppData\Roaming\SubDir\Client.exe"5⤵
- Executes dropped EXE
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Network
MITRE ATT&CK Enterprise v15
Persistence
Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Scheduled Task/Job
1Privilege Escalation
Abuse Elevation Control Mechanism
1Bypass User Account Control
1Boot or Logon Autostart Execution
1Registry Run Keys / Startup Folder
1Scheduled Task/Job
1Defense Evasion
Abuse Elevation Control Mechanism
1Bypass User Account Control
1Impair Defenses
3Disable or Modify Tools
3Modify Registry
5Virtualization/Sandbox Evasion
2Replay Monitor
Loading Replay Monitor...
Downloads
__PSScriptPolicyTest_th5eme4j.b41.ps1
tmp594B.tmp.bat
Client.exe
svchost.exe
memory/220-1-0x00007FFE2D560000-0x00007FFE2E021000-memory.dmp
memory/220-2-0x000001D3C4F10000-0x000001D3C4F20000-memory.dmp
memory/220-3-0x000001D3DD7D0000-0x000001D3DDB48000-memory.dmp
memory/220-8-0x00007FFE2D560000-0x00007FFE2E021000-memory.dmp
memory/220-0-0x000001D3C3360000-0x000001D3C3368000-memory.dmp
memory/920-27-0x0000000074F70000-0x0000000075720000-memory.dmp
memory/920-32-0x0000000005250000-0x0000000005260000-memory.dmp
memory/920-44-0x0000000074F70000-0x0000000075720000-memory.dmp
memory/920-31-0x0000000005210000-0x000000000521A000-memory.dmp
memory/920-28-0x00000000056B0000-0x0000000005C54000-memory.dmp
memory/920-14-0x0000000000400000-0x0000000000724000-memory.dmp
memory/920-30-0x0000000005260000-0x00000000052F2000-memory.dmp
memory/1092-43-0x00000000005F0000-0x0000000000630000-memory.dmp
memory/1092-50-0x0000000074F70000-0x0000000075720000-memory.dmp
memory/1092-48-0x0000000004F70000-0x0000000004F80000-memory.dmp
memory/1092-47-0x00000000050E0000-0x000000000523A000-memory.dmp
memory/1092-46-0x0000000004E10000-0x0000000004E2A000-memory.dmp
memory/1092-45-0x0000000074F70000-0x0000000075720000-memory.dmp
memory/1104-35-0x00007FFE2D280000-0x00007FFE2DD41000-memory.dmp
memory/1104-25-0x000002693FFB0000-0x000002693FFC0000-memory.dmp
memory/1104-29-0x000002693FFB0000-0x000002693FFC0000-memory.dmp
memory/1104-20-0x00007FFE2D280000-0x00007FFE2DD41000-memory.dmp
memory/1104-26-0x000002693FF80000-0x000002693FFA2000-memory.dmp
memory/4900-13-0x00007FFE2D280000-0x00007FFE2DD41000-memory.dmp
memory/4900-36-0x00007FFE2D280000-0x00007FFE2DD41000-memory.dmp