Analysis
- max time kernel
139s - max time network
149s - platform
windows10-2004_x64 - resource
win10v2004-20240412-en - resource tags
- submitted
25/04/2024, 01:41
General
- Target 48cd145349ebdb8a3728c8c55b9e5a59df2ee7676a847afa340d7f88ae24cfd1.exe
- Size 426KB
- Sample240425-b339hadb8s
- SHA256 48cd145349ebdb8a3728c8c55b9e5a59df2ee7676a847afa340d7f88ae24cfd1
Malware Config
Extracted
-
asyncrat
-
1.0.7
-
BSOD_New
-
Mika
-
delay
1
-
install
false
-
install_file
UpdateTaskMachineUa.bat.exe
-
install_folder
%AppData%
-
pastebin_config
https://pastebin.com/raw/F7c4dqk3
Signatures
- AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
- 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 1 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
- Legitimate hosting services abused for malware hosting/C2 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 20 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
-
C:\Users\Admin\AppData\Local\Temp\48cd145349ebdb8a3728c8c55b9e5a59df2ee7676a847afa340d7f88ae24cfd1.exe"C:\Users\Admin\AppData\Local\Temp\48cd145349ebdb8a3728c8c55b9e5a59df2ee7676a847afa340d7f88ae24cfd1.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
-
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
-
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)
-
-
-
C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp2E05.tmp.bat""2⤵
- Suspicious use of WriteProcessMemory
-
C:\Windows\system32\timeout.exetimeout 33⤵
- Delays execution with timeout.exe
-
-
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
-
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
-
-
C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe"C:\Windows\Microsoft.NET\Framework\v4.0.30319\regasm.exe"4⤵
- Suspicious use of AdjustPrivilegeToken
-
-
-
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_szvlxnty.ura.ps1
tmp2E05.tmp.bat
svchost.exe
memory/4068-14-0x0000000000400000-0x0000000000416000-memory.dmp
memory/4068-35-0x0000000005570000-0x0000000005580000-memory.dmp
memory/4068-34-0x0000000074980000-0x0000000075130000-memory.dmp
memory/4068-33-0x0000000005570000-0x0000000005580000-memory.dmp
memory/4068-28-0x0000000074980000-0x0000000075130000-memory.dmp
memory/4436-31-0x00007FFF4A8B0000-0x00007FFF4B371000-memory.dmp
memory/4436-25-0x0000016704550000-0x0000016704572000-memory.dmp
memory/4436-15-0x00007FFF4A8B0000-0x00007FFF4B371000-memory.dmp
memory/4436-26-0x000001671C9E0000-0x000001671C9F0000-memory.dmp
memory/4436-27-0x000001671C9E0000-0x000001671C9F0000-memory.dmp
memory/4764-13-0x00007FFF4A8B0000-0x00007FFF4B371000-memory.dmp
memory/4764-32-0x00007FFF4A8B0000-0x00007FFF4B371000-memory.dmp
memory/4852-9-0x00007FFF4ABE0000-0x00007FFF4B6A1000-memory.dmp
memory/4852-0-0x0000021630340000-0x0000021630348000-memory.dmp
memory/4852-3-0x0000021631F70000-0x0000021631FDA000-memory.dmp
memory/4852-2-0x0000021631FE0000-0x0000021631FF0000-memory.dmp
memory/4852-1-0x00007FFF4ABE0000-0x00007FFF4B6A1000-memory.dmp