asyncrat | 04f2eadb4cf1c2aa1748467be02e801bb3236d0b1cb4ee22edb01eb12abe0dd3

General

Target

Notepad.exe
Size

176KB
MD5

e811a2eea76cc805e26501c13ce781e4
SHA1

9588e37dbdaf367882202067b56a8b89550f16f4
SHA256

04f2eadb4cf1c2aa1748467be02e801bb3236d0b1cb4ee22edb01eb12abe0dd3
SHA512

a4d58e513d00543767d37a571e5f4a5b923a72d7963cc65f138c28c580854fc74a9e3fdad08102b2630f0ded48be01446132477c4ec211848bd9f201f692ccaf
SSDEEP

3072:LuLMTwip2wiMf3bjww24LZGjXpoGoByXPQs2UTXQ8yb7aFcUiSIvF68fJvx:LuLCs/E3bQ4ZGbpYByPT7lyvIcdSIvFX

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

127.0.0.1:6606

127.0.0.1:7707

127.0.0.1:8808

Mutex

2MadfT525Jmp

Attributes

delay
3
install
true
install_file
epicgames.exe
install_folder
%AppData%

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat
Asyncrat family
asyncrat

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral2/files/0x0008000000023ca1-12.dat	family_asyncrat

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	Notepad.exe

Executes dropped EXE 1 IoCs

pid	Process
4988	epicgames.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 6 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	epicgames.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Notepad.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
4092	timeout.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
4484	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
2684	Notepad.exe
2684	Notepad.exe
2684	Notepad.exe
2684	Notepad.exe
2684	Notepad.exe
2684	Notepad.exe
2684	Notepad.exe
2684	Notepad.exe
2684	Notepad.exe
2684	Notepad.exe
2684	Notepad.exe
2684	Notepad.exe
2684	Notepad.exe
2684	Notepad.exe
2684	Notepad.exe
2684	Notepad.exe
2684	Notepad.exe
2684	Notepad.exe
2684	Notepad.exe
2684	Notepad.exe
2684	Notepad.exe
2684	Notepad.exe
2684	Notepad.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2684	Notepad.exe
Token: SeDebugPrivilege	4988	epicgames.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 2684 wrote to memory of 772	2684	Notepad.exe	86
PID 2684 wrote to memory of 772	2684	Notepad.exe	86
PID 2684 wrote to memory of 772	2684	Notepad.exe	86
PID 2684 wrote to memory of 2344	2684	Notepad.exe	88
PID 2684 wrote to memory of 2344	2684	Notepad.exe	88
PID 2684 wrote to memory of 2344	2684	Notepad.exe	88
PID 772 wrote to memory of 4484	772	cmd.exe	90
PID 772 wrote to memory of 4484	772	cmd.exe	90
PID 772 wrote to memory of 4484	772	cmd.exe	90
PID 2344 wrote to memory of 4092	2344	cmd.exe	91
PID 2344 wrote to memory of 4092	2344	cmd.exe	91
PID 2344 wrote to memory of 4092	2344	cmd.exe	91
PID 2344 wrote to memory of 4988	2344	cmd.exe	97
PID 2344 wrote to memory of 4988	2344	cmd.exe	97
PID 2344 wrote to memory of 4988	2344	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\Notepad.exe
"C:\Users\Admin\AppData\Local\Temp\Notepad.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2684
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "epicgames" /tr '"C:\Users\Admin\AppData\Roaming\epicgames.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:772
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "epicgames" /tr '"C:\Users\Admin\AppData\Roaming\epicgames.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:4484
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpDA72.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2344
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:4092
- - C:\Users\Admin\AppData\Roaming\epicgames.exe
    "C:\Users\Admin\AppData\Roaming\epicgames.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:4988

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpDA72.tmp.bat

Filesize
153B

MD5
782e0c0137851739d718957809eeabd5

SHA1
bd0839c49b256d3eca4db94212e07906ada1f60f

SHA256
9a9b488746162fed7b32f9cd4f29952513801fe237eca798e03e4c2b980790b9

SHA512
7408d98541d3edba8aa4821f90042ca7754a9c3e75835e0119e94a3e1954ade368baaa20100a289740cd64bb3e30336f8c272adedc7dd978f2f9721db03d93f1

Download Submit
C:\Users\Admin\AppData\Roaming\epicgames.exe

Filesize
176KB

MD5
e811a2eea76cc805e26501c13ce781e4

SHA1
9588e37dbdaf367882202067b56a8b89550f16f4

SHA256
04f2eadb4cf1c2aa1748467be02e801bb3236d0b1cb4ee22edb01eb12abe0dd3

SHA512
a4d58e513d00543767d37a571e5f4a5b923a72d7963cc65f138c28c580854fc74a9e3fdad08102b2630f0ded48be01446132477c4ec211848bd9f201f692ccaf

Download Submit
memory/2684-0-0x0000000074A6E000-0x0000000074A6F000-memory.dmp

Filesize
4KB

Download
memory/2684-1-0x0000000000F00000-0x0000000000F32000-memory.dmp

Filesize
200KB

Download
memory/2684-2-0x0000000074A60000-0x0000000075210000-memory.dmp

Filesize
7.7MB

Download
memory/2684-3-0x00000000058D0000-0x0000000005936000-memory.dmp

Filesize
408KB

Download
memory/2684-4-0x0000000005D50000-0x0000000005DEC000-memory.dmp

Filesize
624KB

Download
memory/2684-9-0x0000000074A60000-0x0000000075210000-memory.dmp

Filesize
7.7MB

Download
memory/4988-14-0x00000000749D0000-0x0000000075180000-memory.dmp

Filesize
7.7MB

Download
memory/4988-15-0x00000000749D0000-0x0000000075180000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads