Analysis
- max time kernel
149s - max time network
146s - platform
windows11-21h2_x64 - resource
win11-20260130-en - resource tags
- submitted
27/04/2026, 04:26
General
- Target eris.uk.net.exe
- Size 114KB
- Sample260427-e2rqvsby4y
- SHA256 173935740f9735a14521667c29431c21567ae20a54d857e7e8c2d4b9e9ac2959
Malware Config
Extracted
-
asyncrat
-
0.5.8
-
Default
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uUJfGoXpVqMy
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delay
10
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install
true
-
install_file
Firefox.exe
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install_folder
%AppData%
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pastebin_config
https://pastebin.com/raw/s14cUU5G
Signatures
- Family: AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
- Async RAT payload 1 IoCs
- Executes dropped EXE 2 IoCs
- Contacts third-party web service commonly abused for C2 1 TTPs 2 IoCs
Legitimate web (hosting) services can be abused by malware authors to host malware or C2s.
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- System Location Discovery: System Language Discovery 1 TTPs 7 IoCs
Attempt gather information about the system language of a victim in order to infer the geographical location of that host.
- Delays execution with timeout.exe 1 IoCs
- Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
- Suspicious behavior: EnumeratesProcesses 19 IoCs
- Suspicious use of AdjustPrivilegeToken 2 IoCs
- Suspicious use of WriteProcessMemory 5 IoCs
Processes
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C:\Users\Admin\AppData\Local\Temp\eris.uk.net.exe"C:\Users\Admin\AppData\Local\Temp\eris.uk.net.exe"1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\cmd.exe"C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Firefox" /tr '"C:\Users\Admin\AppData\Roaming\Firefox.exe"' & exit2⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\schtasks.exeschtasks /create /f /sc onlogon /rl highest /tn "Firefox" /tr '"C:\Users\Admin\AppData\Roaming\Firefox.exe"'3⤵
- System Location Discovery: System Language Discovery
- Scheduled Task/Job: Scheduled Task
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C:\Windows\SysWOW64\cmd.exeC:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp2640.tmp.bat""2⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
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C:\Windows\SysWOW64\timeout.exetimeout 33⤵
- System Location Discovery: System Language Discovery
- Delays execution with timeout.exe
-
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C:\Users\Admin\AppData\Roaming\Firefox.exe"C:\Users\Admin\AppData\Roaming\Firefox.exe"3⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
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-
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C:\Users\Admin\AppData\Roaming\Firefox.exe"C:\Users\Admin\AppData\Roaming\Firefox.exe"1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
Network
MITRE ATT&CK Enterprise v16
Replay Monitor
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Downloads
tmp2640.tmp.bat
Firefox.exe
memory/3648-16-0x00000000016C0000-0x00000000016CB000-memory.dmp
memory/3648-15-0x0000000005530000-0x0000000005B32000-memory.dmp
memory/3648-19-0x00000000016C0000-0x00000000016CB000-memory.dmp
memory/3648-18-0x0000000005530000-0x0000000005B32000-memory.dmp
memory/4136-13-0x0000000004930000-0x0000000004F32000-memory.dmp
memory/4136-14-0x00000000009D0000-0x00000000009DB000-memory.dmp
memory/4972-3-0x00000000060D0000-0x000000000616C000-memory.dmp
memory/4972-8-0x0000000005990000-0x0000000005F92000-memory.dmp
memory/4972-2-0x0000000006020000-0x0000000006030000-memory.dmp
memory/4972-1-0x0000000005990000-0x0000000005F92000-memory.dmp
memory/4972-0-0x0000000000F60000-0x0000000000F82000-memory.dmp