asyncrat | a198dce2dbfe7110ccf2079a14d13645a6228bc7927d74fd3266f32e7b2da4f7

General

Target

bootstrap.exe
Size

45KB
MD5

df16b88dd944d75a59c53a759ad6cbfa
SHA1

64f1d48f096b3b9c505a53fdfb0068c821835030
SHA256

a198dce2dbfe7110ccf2079a14d13645a6228bc7927d74fd3266f32e7b2da4f7
SHA512

9909cc8cabb8a4855b126211eabc126eef7e8bc64e97bb6ac5b56bf866df644480918430c81b83afff9a4386a17bed3245ae6b1857e293d18cdebca323968127
SSDEEP

768:puLb+TwQhclWUlNzWmo2qD3MREVSrWOPI6zjbugXRicEQTP4MBDZ6x:puLb+Twip2SMiUi363bRXAcjb4Kd6x

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

vBItBvMTrx8n

Attributes

delay
3
install
true
install_file
cached_files.exe
install_folder
%Temp%

aes.plain

Signatures

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

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral1/files/0x000500000002aa5c-11.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
1684	cached_files.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	bootstrap.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.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	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cached_files.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
1592	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
5016	schtasks.exe

Suspicious behavior: EnumeratesProcesses 19 IoCs

pid	Process
248	bootstrap.exe
248	bootstrap.exe
248	bootstrap.exe
248	bootstrap.exe
248	bootstrap.exe
248	bootstrap.exe
248	bootstrap.exe
248	bootstrap.exe
248	bootstrap.exe
248	bootstrap.exe
248	bootstrap.exe
248	bootstrap.exe
248	bootstrap.exe
248	bootstrap.exe
248	bootstrap.exe
248	bootstrap.exe
248	bootstrap.exe
248	bootstrap.exe
248	bootstrap.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	248	bootstrap.exe
Token: SeDebugPrivilege	1684	cached_files.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 248 wrote to memory of 2836	248	bootstrap.exe	79
PID 248 wrote to memory of 2836	248	bootstrap.exe	79
PID 248 wrote to memory of 2836	248	bootstrap.exe	79
PID 248 wrote to memory of 1432	248	bootstrap.exe	81
PID 248 wrote to memory of 1432	248	bootstrap.exe	81
PID 248 wrote to memory of 1432	248	bootstrap.exe	81
PID 2836 wrote to memory of 5016	2836	cmd.exe	83
PID 2836 wrote to memory of 5016	2836	cmd.exe	83
PID 2836 wrote to memory of 5016	2836	cmd.exe	83
PID 1432 wrote to memory of 1592	1432	cmd.exe	84
PID 1432 wrote to memory of 1592	1432	cmd.exe	84
PID 1432 wrote to memory of 1592	1432	cmd.exe	84
PID 1432 wrote to memory of 1684	1432	cmd.exe	85
PID 1432 wrote to memory of 1684	1432	cmd.exe	85
PID 1432 wrote to memory of 1684	1432	cmd.exe	85

C:\Users\Admin\AppData\Local\Temp\bootstrap.exe
"C:\Users\Admin\AppData\Local\Temp\bootstrap.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:248
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "cached_files" /tr '"C:\Users\Admin\AppData\Local\Temp\cached_files.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2836
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "cached_files" /tr '"C:\Users\Admin\AppData\Local\Temp\cached_files.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:5016
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp924D.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1432
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:1592
- - C:\Users\Admin\AppData\Local\Temp\cached_files.exe
    "C:\Users\Admin\AppData\Local\Temp\cached_files.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:1684

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:3836

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\cached_files.exe

Filesize
45KB

MD5
df16b88dd944d75a59c53a759ad6cbfa

SHA1
64f1d48f096b3b9c505a53fdfb0068c821835030

SHA256
a198dce2dbfe7110ccf2079a14d13645a6228bc7927d74fd3266f32e7b2da4f7

SHA512
9909cc8cabb8a4855b126211eabc126eef7e8bc64e97bb6ac5b56bf866df644480918430c81b83afff9a4386a17bed3245ae6b1857e293d18cdebca323968127

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp924D.tmp.bat

Filesize
159B

MD5
f3e13c6f8fa723253c98ccb385e200c4

SHA1
610eb73f9ae64ae3244e24bbb8f5972f52b519fa

SHA256
483b956587335f84345ac4440e2178c72e4a1e021ac76b6894d6973e797735c6

SHA512
b1be62bd9fdd9297348dc418c5e9109426cda45f8a96b5e41699246103fcd3d6de94095c6c02cc39c568a1a901d3dd8720d6d7f5015bfc6f2051026c5062c22d

Download Submit
memory/248-0-0x000000007504E000-0x000000007504F000-memory.dmp

Filesize
4KB

Download
memory/248-1-0x0000000000460000-0x0000000000472000-memory.dmp

Filesize
72KB

Download
memory/248-2-0x0000000075040000-0x00000000757F1000-memory.dmp

Filesize
7.7MB

Download
memory/248-3-0x0000000004F20000-0x0000000004FBC000-memory.dmp

Filesize
624KB

Download
memory/248-8-0x0000000075040000-0x00000000757F1000-memory.dmp

Filesize
7.7MB

Download
memory/1684-13-0x0000000075040000-0x00000000757F1000-memory.dmp

Filesize
7.7MB

Download
memory/1684-14-0x0000000075040000-0x00000000757F1000-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