asyncrat | c4fc07ee159833de867dba73696d99b8204af6155c532966f7f05b88eddc33ee

General

Target

AsyncClient.exe
Size

45KB
MD5

cb1e372373b48ed46beb8165664a8a2e
SHA1

eb3047ed673aa5a4251fcd08b3c9a46276a66865
SHA256

c4fc07ee159833de867dba73696d99b8204af6155c532966f7f05b88eddc33ee
SHA512

9b71a1fb6e0f5460897e962ef0d5feb7d30a1641230cc6c65e2a77091f57cd809ab91ae77b0ef0ae6c8a988021761c65cde58fbd9748eecddf411d4ae3266e36
SSDEEP

768:+uynFTMIGZ8btAWUu7y6mo2q8YKjPGaG6PIyzjbFgX3iLsjiBYzizYdNmBDZqx:+uynFTMtkf2MKTkDy3bCXSQOK+YdNodo

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

192.168.0.174:8808

Mutex

WjV4Z2ndPKB4

Attributes

delay
3
install
true
install_file
dad.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/0x0034000000016d64-13.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
2604	dad.exe

Loads dropped DLL 1 IoCs

pid	Process
2832	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	AsyncClient.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	dad.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2584	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
2556	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2644	AsyncClient.exe
2644	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	2644	AsyncClient.exe
Token: SeDebugPrivilege	2604	dad.exe
Token: SeDebugPrivilege	3060	whoami.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 2644 wrote to memory of 2820	2644	AsyncClient.exe	30
PID 2644 wrote to memory of 2820	2644	AsyncClient.exe	30
PID 2644 wrote to memory of 2820	2644	AsyncClient.exe	30
PID 2644 wrote to memory of 2820	2644	AsyncClient.exe	30
PID 2644 wrote to memory of 2832	2644	AsyncClient.exe	32
PID 2644 wrote to memory of 2832	2644	AsyncClient.exe	32
PID 2644 wrote to memory of 2832	2644	AsyncClient.exe	32
PID 2644 wrote to memory of 2832	2644	AsyncClient.exe	32
PID 2820 wrote to memory of 2556	2820	cmd.exe	33
PID 2820 wrote to memory of 2556	2820	cmd.exe	33
PID 2820 wrote to memory of 2556	2820	cmd.exe	33
PID 2820 wrote to memory of 2556	2820	cmd.exe	33
PID 2832 wrote to memory of 2584	2832	cmd.exe	35
PID 2832 wrote to memory of 2584	2832	cmd.exe	35
PID 2832 wrote to memory of 2584	2832	cmd.exe	35
PID 2832 wrote to memory of 2584	2832	cmd.exe	35
PID 2832 wrote to memory of 2604	2832	cmd.exe	36
PID 2832 wrote to memory of 2604	2832	cmd.exe	36
PID 2832 wrote to memory of 2604	2832	cmd.exe	36
PID 2832 wrote to memory of 2604	2832	cmd.exe	36
PID 1040 wrote to memory of 3060	1040	cmd.exe	40
PID 1040 wrote to memory of 3060	1040	cmd.exe	40
PID 1040 wrote to memory of 3060	1040	cmd.exe	40

C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe
"C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2644
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "dad" /tr '"C:\Users\Admin\AppData\Roaming\dad.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2820
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "dad" /tr '"C:\Users\Admin\AppData\Roaming\dad.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2556
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp8B8.tmp.bat""
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2832
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2584
- - C:\Users\Admin\AppData\Roaming\dad.exe
    "C:\Users\Admin\AppData\Roaming\dad.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2604

C:\Windows\system32\cmd.exe
"C:\Windows\system32\cmd.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1040
- C:\Windows\system32\whoami.exe
  whoami
  2⤵
  - Suspicious use of AdjustPrivilegeToken
  PID:3060

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\tmp8B8.tmp.bat

Filesize
146B

MD5
b6490b1d5b879eeb506099bc97b12d73

SHA1
da5e955d15a7c95293e8aab0536ccc2b704526d0

SHA256
2a3d4bbd54b7cc9e98a4997b7f24dec0a079fa1ecabc93769ae8bd3bab142162

SHA512
d135e4421710c287e12d4d8e0d264cae215ef85f45f685b8551c050d1cb13e280ccf7f433b916a88cd920a2fa26148786b2cdbcaac98919845e2d4210996d9f3

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

Filesize
45KB

MD5
cb1e372373b48ed46beb8165664a8a2e

SHA1
eb3047ed673aa5a4251fcd08b3c9a46276a66865

SHA256
c4fc07ee159833de867dba73696d99b8204af6155c532966f7f05b88eddc33ee

SHA512
9b71a1fb6e0f5460897e962ef0d5feb7d30a1641230cc6c65e2a77091f57cd809ab91ae77b0ef0ae6c8a988021761c65cde58fbd9748eecddf411d4ae3266e36

Download Submit
memory/2604-16-0x0000000000820000-0x0000000000832000-memory.dmp

Filesize
72KB

Download
memory/2644-0-0x0000000074E1E000-0x0000000074E1F000-memory.dmp

Filesize
4KB

Download
memory/2644-1-0x0000000000BF0000-0x0000000000C02000-memory.dmp

Filesize
72KB

Download
memory/2644-2-0x0000000074E10000-0x00000000754FE000-memory.dmp

Filesize
6.9MB

Download
memory/2644-11-0x0000000074E10000-0x00000000754FE000-memory.dmp

Filesize
6.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads