asyncrat | 00577d6d7e7d1a3417d89d07668136959978c0bb4ec4f35b8e32f683e65d8ea6

General

Target

Caser.exe
Size

45KB
MD5

853e7871e4a6f398fe39c88b39a064e9
SHA1

81cfc85c75c314e1d7be9e0aef35562ac1a86d9a
SHA256

00577d6d7e7d1a3417d89d07668136959978c0bb4ec4f35b8e32f683e65d8ea6
SHA512

b37158344ad8b5b34cf132c770e95840a00ea6e06001042416cc2030485e9d848a09a37323e3dc82f07c20029ede6ba83be05c0d7f61ff4684d64ecf4cbf70ae
SSDEEP

768:luI1tT/w70kWUquzumo2qzEKjPGaG6PIyzjbFgX3iFUGIAAj9gtsaVzBDZWx:luI1tT/kW2tKTkDy3bCXSFlIr9giedWx

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

127.0.0.1:2424

Mutex

dPEIFfZH3RI0

Attributes

delay
3
install
true
install_file
virus.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
behavioral1/files/0x000a00000001202c-13.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
2940	virus.exe

Loads dropped DLL 1 IoCs

pid	Process
2240	cmd.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	Caser.exe
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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	virus.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2092	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
484	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
1624	Caser.exe
1624	Caser.exe
1624	Caser.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1624	Caser.exe
Token: SeDebugPrivilege	2940	virus.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 1624 wrote to memory of 3016	1624	Caser.exe	30
PID 1624 wrote to memory of 3016	1624	Caser.exe	30
PID 1624 wrote to memory of 3016	1624	Caser.exe	30
PID 1624 wrote to memory of 3016	1624	Caser.exe	30
PID 1624 wrote to memory of 2240	1624	Caser.exe	32
PID 1624 wrote to memory of 2240	1624	Caser.exe	32
PID 1624 wrote to memory of 2240	1624	Caser.exe	32
PID 1624 wrote to memory of 2240	1624	Caser.exe	32
PID 3016 wrote to memory of 484	3016	cmd.exe	33
PID 3016 wrote to memory of 484	3016	cmd.exe	33
PID 3016 wrote to memory of 484	3016	cmd.exe	33
PID 3016 wrote to memory of 484	3016	cmd.exe	33
PID 2240 wrote to memory of 2092	2240	cmd.exe	35
PID 2240 wrote to memory of 2092	2240	cmd.exe	35
PID 2240 wrote to memory of 2092	2240	cmd.exe	35
PID 2240 wrote to memory of 2092	2240	cmd.exe	35
PID 2240 wrote to memory of 2940	2240	cmd.exe	36
PID 2240 wrote to memory of 2940	2240	cmd.exe	36
PID 2240 wrote to memory of 2940	2240	cmd.exe	36
PID 2240 wrote to memory of 2940	2240	cmd.exe	36

C:\Users\Admin\AppData\Local\Temp\Caser.exe
"C:\Users\Admin\AppData\Local\Temp\Caser.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1624
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "virus" /tr '"C:\Users\Admin\AppData\Roaming\virus.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3016
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "virus" /tr '"C:\Users\Admin\AppData\Roaming\virus.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:484
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpC005.tmp.bat""
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2240
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2092
- - C:\Users\Admin\AppData\Roaming\virus.exe
    "C:\Users\Admin\AppData\Roaming\virus.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2940

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

System Information Discovery

1

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\tmpC005.tmp.bat

Filesize
149B

MD5
7cdd0978894689157922a21970cb7a7a

SHA1
98a7c3b30604ed3a6c93de91d3a327bee3fed336

SHA256
8c94a7076451c5992652218cb9fa8e7748a72dd70db38bfc82e2394a2a92521d

SHA512
834c91dacb46a53a108274f542961ca54b35872fb396e51a3b726e49f7ac478846ae614a8e735001d1ce0c94ffacde70ece1ea62f2b28d3c3915d7d0710fc623

Download Submit
\Users\Admin\AppData\Roaming\virus.exe

Filesize
45KB

MD5
853e7871e4a6f398fe39c88b39a064e9

SHA1
81cfc85c75c314e1d7be9e0aef35562ac1a86d9a

SHA256
00577d6d7e7d1a3417d89d07668136959978c0bb4ec4f35b8e32f683e65d8ea6

SHA512
b37158344ad8b5b34cf132c770e95840a00ea6e06001042416cc2030485e9d848a09a37323e3dc82f07c20029ede6ba83be05c0d7f61ff4684d64ecf4cbf70ae

Download Submit
memory/1624-0-0x000000007492E000-0x000000007492F000-memory.dmp

Filesize
4KB

Download
memory/1624-1-0x0000000000F20000-0x0000000000F32000-memory.dmp

Filesize
72KB

Download
memory/1624-2-0x0000000074920000-0x000000007500E000-memory.dmp

Filesize
6.9MB

Download
memory/1624-11-0x0000000074920000-0x000000007500E000-memory.dmp

Filesize
6.9MB

Download
memory/2940-16-0x0000000000C80000-0x0000000000C92000-memory.dmp

Filesize
72KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads