asyncrat | 47bcb7f1a4b0ff298324a6121acdbb739820aca4aca1289094134e9681895e61

General

Target

AsyncClient test.exe
Size

79KB
MD5

a29f945c15c3187b7b890f89c3b6cb49
SHA1

0b9e9ed0f6807475dbbff87542eac10286b33945
SHA256

47bcb7f1a4b0ff298324a6121acdbb739820aca4aca1289094134e9681895e61
SHA512

4c44982e5a5c142cf2a9226f86c39098f4c42f7d873af747a8ede4ca2dba9334ee6f53abf95984e7b5fa836bba91d4a38d68f447281db8d1b7062097068d910c
SSDEEP

1536:RuYH9T34y2e2QUbcHSSVQDbGIzfp3OY7NdWmW:RuYdT34y2e2QUbcyNbGIzx3l7NfW

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

Mutex

0ZOg4qZ0tD2Z

Attributes

delay
3
install
true
install_file
TEST.exe
install_folder
%AppData%
pastebin_config
https://pastebin.com/raw/s14cUU5G

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/0x0008000000015e46-13.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
2648	TEST.exe

Loads dropped DLL 1 IoCs

pid	Process
2660	cmd.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
4	pastebin.com
5	pastebin.com

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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	TEST.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AsyncClient test.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2768	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
2764	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
1596	AsyncClient test.exe
1596	AsyncClient test.exe
1596	AsyncClient test.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1596	AsyncClient test.exe
Token: SeDebugPrivilege	2648	TEST.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 1596 wrote to memory of 592	1596	AsyncClient test.exe	32
PID 1596 wrote to memory of 592	1596	AsyncClient test.exe	32
PID 1596 wrote to memory of 592	1596	AsyncClient test.exe	32
PID 1596 wrote to memory of 592	1596	AsyncClient test.exe	32
PID 1596 wrote to memory of 2660	1596	AsyncClient test.exe	34
PID 1596 wrote to memory of 2660	1596	AsyncClient test.exe	34
PID 1596 wrote to memory of 2660	1596	AsyncClient test.exe	34
PID 1596 wrote to memory of 2660	1596	AsyncClient test.exe	34
PID 592 wrote to memory of 2764	592	cmd.exe	36
PID 592 wrote to memory of 2764	592	cmd.exe	36
PID 592 wrote to memory of 2764	592	cmd.exe	36
PID 592 wrote to memory of 2764	592	cmd.exe	36
PID 2660 wrote to memory of 2768	2660	cmd.exe	37
PID 2660 wrote to memory of 2768	2660	cmd.exe	37
PID 2660 wrote to memory of 2768	2660	cmd.exe	37
PID 2660 wrote to memory of 2768	2660	cmd.exe	37
PID 2660 wrote to memory of 2648	2660	cmd.exe	38
PID 2660 wrote to memory of 2648	2660	cmd.exe	38
PID 2660 wrote to memory of 2648	2660	cmd.exe	38
PID 2660 wrote to memory of 2648	2660	cmd.exe	38
PID 2660 wrote to memory of 2648	2660	cmd.exe	38
PID 2660 wrote to memory of 2648	2660	cmd.exe	38
PID 2660 wrote to memory of 2648	2660	cmd.exe	38

C:\Users\Admin\AppData\Local\Temp\AsyncClient test.exe
"C:\Users\Admin\AppData\Local\Temp\AsyncClient test.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1596
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "TEST" /tr '"C:\Users\Admin\AppData\Roaming\TEST.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:592
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "TEST" /tr '"C:\Users\Admin\AppData\Roaming\TEST.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2764
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpD394.tmp.bat""
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2660
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2768
- - C:\Users\Admin\AppData\Roaming\TEST.exe
    "C:\Users\Admin\AppData\Roaming\TEST.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2648

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

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpD394.tmp.bat

Filesize
148B

MD5
f59c4d073e1f85d858c76739d9333b43

SHA1
e5e85fdec6051d967b312201205542475a4913ed

SHA256
d74f4be87266f0d714b30adcca1c0222b0733ed166896637e8a7e6c916e2b8e7

SHA512
fca2def134c7c13d6c812f38a6be7ffca59dcfd11811f7a3dade5b382e0caeb3acefe1e41bfb0e79dcdd89743d11a257350a463f2367f25528ec0fc8cca38152

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

Filesize
79KB

MD5
a29f945c15c3187b7b890f89c3b6cb49

SHA1
0b9e9ed0f6807475dbbff87542eac10286b33945

SHA256
47bcb7f1a4b0ff298324a6121acdbb739820aca4aca1289094134e9681895e61

SHA512
4c44982e5a5c142cf2a9226f86c39098f4c42f7d873af747a8ede4ca2dba9334ee6f53abf95984e7b5fa836bba91d4a38d68f447281db8d1b7062097068d910c

Download Submit
memory/1596-0-0x000000007430E000-0x000000007430F000-memory.dmp

Filesize
4KB

Download
memory/1596-1-0x0000000000850000-0x000000000086A000-memory.dmp

Filesize
104KB

Download
memory/1596-2-0x0000000074300000-0x00000000749EE000-memory.dmp

Filesize
6.9MB

Download
memory/1596-12-0x0000000074300000-0x00000000749EE000-memory.dmp

Filesize
6.9MB

Download
memory/2648-16-0x00000000008D0000-0x00000000008EA000-memory.dmp

Filesize
104KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads