Analysis
- max time kernel
150s - max time network
151s - platform
windows10-2004_x64 - resource
win10v2004-20231130-en - resource tags
- submitted
11/12/2023, 02:51
General
- Target b1f9b99c6b80bdb62f91f75f6cd4d118.exe
- Size 64KB
- Sample231211-dcnggacdc7
- SHA256 77d34192550c3aee5d8f826efc4b7a20d84db9771d70ef46656ce65377406bc2
Malware Config
Extracted
-
asyncrat
-
Runtime Broker
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404nothere5-62048.portmap.host:62048
-
2Eي吉يFK勒5KHרT诶Aקf
-
delay
1
-
install
true
-
install_file
Runtime Broker.exe
-
install_folder
%AppData%
Signatures
- AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
- Async RAT payload 2 IoCs
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- Executes dropped EXE 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 64 IoCs
- Suspicious use of AdjustPrivilegeToken 2 IoCs
- Suspicious use of WriteProcessMemory 10 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\b1f9b99c6b80bdb62f91f75f6cd4d118.exe"C:\Users\Admin\AppData\Local\Temp\b1f9b99c6b80bdb62f91f75f6cd4d118.exe"1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp421A.tmp.bat""2⤵
- Suspicious use of WriteProcessMemory
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C:\Users\Admin\AppData\Roaming\Runtime Broker.exe"C:\Users\Admin\AppData\Roaming\Runtime Broker.exe"3⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
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-
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C:\Windows\System32\cmd.exe"C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Runtime Broker" /tr '"C:\Users\Admin\AppData\Roaming\Runtime Broker.exe"' & exit2⤵
- Suspicious use of WriteProcessMemory
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C:\Windows\system32\timeout.exetimeout 31⤵
- Delays execution with timeout.exe
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C:\Windows\system32\schtasks.exeschtasks /create /f /sc onlogon /rl highest /tn "Runtime Broker" /tr '"C:\Users\Admin\AppData\Roaming\Runtime Broker.exe"'1⤵
- Creates scheduled task(s)
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
tmp421A.tmp.bat
Runtime Broker.exe
memory/3884-15-0x00007FF935100000-0x00007FF935BC1000-memory.dmp
memory/3884-16-0x000000001B2B0000-0x000000001B2C0000-memory.dmp
memory/3884-17-0x00007FF9537B0000-0x00007FF9539A5000-memory.dmp
memory/3884-18-0x00007FF935100000-0x00007FF935BC1000-memory.dmp
memory/3884-19-0x000000001B2B0000-0x000000001B2C0000-memory.dmp
memory/3884-20-0x00007FF9537B0000-0x00007FF9539A5000-memory.dmp
memory/4480-8-0x00007FF93E510000-0x00007FF93E529000-memory.dmp
memory/4480-10-0x00007FF9537B0000-0x00007FF9539A5000-memory.dmp
memory/4480-9-0x00007FF935850000-0x00007FF936311000-memory.dmp
memory/4480-2-0x0000000001190000-0x00000000011A0000-memory.dmp
memory/4480-7-0x00007FF9537B0000-0x00007FF9539A5000-memory.dmp
memory/4480-1-0x00007FF935850000-0x00007FF936311000-memory.dmp
memory/4480-0-0x0000000000CB0000-0x0000000000CC6000-memory.dmp