asyncrat | e544ff3ed62db97c02442c849b3214a7b3d913fb73b430d79edf557e7ec91555

General

Target

AsyncClient.exe
Size

47KB
MD5

c792e7efbdb2d57c605efcb45a48109d
SHA1

eb0c663a68aee213c6b64e1f10207409f0da5b20
SHA256

e544ff3ed62db97c02442c849b3214a7b3d913fb73b430d79edf557e7ec91555
SHA512

f407285fd965f6d7e5ea42312fda6159cd9546480e2752983cf6f784c414ee040446c6bbb595d27e9d27d07e5f59355265fe7384f6666af86c3c6a8e1aa74b33
SSDEEP

768:Juk0VT3ongoWU2Gjimo2qryBmv83OxmIsPIjACXD9izQ0b3eQbC2l6S6heyV27H1:Juk0VT3Q+2qg0jAgCb3ZbC2lqYyV27hv

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

127.0.0.1:7707

127.0.0.1:8808

Mutex

uSyaMxhmF1LU

Attributes

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

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/0x0008000000015dab-15.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
2752	hey.exe

Loads dropped DLL 1 IoCs

pid	Process
2792	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	hey.exe
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

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
3048	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
2648	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
1220	AsyncClient.exe
1220	AsyncClient.exe
1220	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1220	AsyncClient.exe
Token: SeDebugPrivilege	2752	hey.exe
Token: SeDebugPrivilege	2752	hey.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 1220 wrote to memory of 2464	1220	AsyncClient.exe	31
PID 1220 wrote to memory of 2464	1220	AsyncClient.exe	31
PID 1220 wrote to memory of 2464	1220	AsyncClient.exe	31
PID 1220 wrote to memory of 2464	1220	AsyncClient.exe	31
PID 1220 wrote to memory of 2792	1220	AsyncClient.exe	33
PID 1220 wrote to memory of 2792	1220	AsyncClient.exe	33
PID 1220 wrote to memory of 2792	1220	AsyncClient.exe	33
PID 1220 wrote to memory of 2792	1220	AsyncClient.exe	33
PID 2464 wrote to memory of 2648	2464	cmd.exe	35
PID 2464 wrote to memory of 2648	2464	cmd.exe	35
PID 2464 wrote to memory of 2648	2464	cmd.exe	35
PID 2464 wrote to memory of 2648	2464	cmd.exe	35
PID 2792 wrote to memory of 3048	2792	cmd.exe	36
PID 2792 wrote to memory of 3048	2792	cmd.exe	36
PID 2792 wrote to memory of 3048	2792	cmd.exe	36
PID 2792 wrote to memory of 3048	2792	cmd.exe	36
PID 2792 wrote to memory of 2752	2792	cmd.exe	37
PID 2792 wrote to memory of 2752	2792	cmd.exe	37
PID 2792 wrote to memory of 2752	2792	cmd.exe	37
PID 2792 wrote to memory of 2752	2792	cmd.exe	37

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:1220
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "hey" /tr '"C:\Users\Admin\AppData\Roaming\hey.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2464
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "hey" /tr '"C:\Users\Admin\AppData\Roaming\hey.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2648
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpE4B4.tmp.bat""
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2792
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:3048
- - C:\Users\Admin\AppData\Roaming\hey.exe
    "C:\Users\Admin\AppData\Roaming\hey.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2752

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

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\tmpE4B4.tmp.bat

Filesize
147B

MD5
13af548e51d291a9cf826d5f2c0eecde

SHA1
77670077a90a1b06dd6272ff7be3df0adda960bf

SHA256
a2a302741ec53819afc9b16d2c41d65241d8c116283caf43c2c0571607ae216a

SHA512
a21205f333796d0ec6b0f0c984854b0bfe1e32f1a63e80a1388b8637844ca9f9a732c526f46264f30b42cf44bc8f0f56bd35082a8fe57e681855d7e2130fa78d

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

Filesize
47KB

MD5
c792e7efbdb2d57c605efcb45a48109d

SHA1
eb0c663a68aee213c6b64e1f10207409f0da5b20

SHA256
e544ff3ed62db97c02442c849b3214a7b3d913fb73b430d79edf557e7ec91555

SHA512
f407285fd965f6d7e5ea42312fda6159cd9546480e2752983cf6f784c414ee040446c6bbb595d27e9d27d07e5f59355265fe7384f6666af86c3c6a8e1aa74b33

Download Submit
memory/1220-0-0x000000007476E000-0x000000007476F000-memory.dmp

Filesize
4KB

Download
memory/1220-1-0x0000000000270000-0x0000000000282000-memory.dmp

Filesize
72KB

Download
memory/1220-2-0x0000000074760000-0x0000000074E4E000-memory.dmp

Filesize
6.9MB

Download
memory/1220-11-0x0000000074760000-0x0000000074E4E000-memory.dmp

Filesize
6.9MB

Download
memory/2752-16-0x0000000000A90000-0x0000000000AA2000-memory.dmp

Filesize
72KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads