asyncrat | c61af51a2fd8fc0e50206237844a14b5d5fbab5fb9963ac579d292e864f7799d

General

Target

AsyncClient.exe
Size

47KB
MD5

84ce795a60f779cc933bf3cc6e794fa2
SHA1

a67cbd9ab868d1b07cc882c6235f0f2e4dad0bb9
SHA256

c61af51a2fd8fc0e50206237844a14b5d5fbab5fb9963ac579d292e864f7799d
SHA512

3651fe88baf783f25ae5fad59e24c340895f6db8d0c57497d07cd46681ee7fc94364e436764245c3fad6f4f90414ac21efb66b37ebac0d58a4db31edc2b33bfa
SSDEEP

768:4uk0VT3ongoWU2Gjimo2qrHNxsdukHAlPI+SxRpugo0b7t65XB5QeF/aI9BDZ7x:4uk0VT3Q+2yyN+SxREGb7QnFnd7x

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

rAex1GkFWgUj

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/0x001d000000018f3e-13.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
2920	hey.exe

Loads dropped DLL 1 IoCs

pid	Process
2756	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	schtasks.exe
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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2188	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
2852	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
1052	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	1052	AsyncClient.exe
Token: SeDebugPrivilege	2920	hey.exe
Token: SeDebugPrivilege	2920	hey.exe
Token: 33	1600	AUDIODG.EXE
Token: SeIncBasePriorityPrivilege	1600	AUDIODG.EXE
Token: 33	1600	AUDIODG.EXE
Token: SeIncBasePriorityPrivilege	1600	AUDIODG.EXE

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 1052 wrote to memory of 2748	1052	AsyncClient.exe	31
PID 1052 wrote to memory of 2748	1052	AsyncClient.exe	31
PID 1052 wrote to memory of 2748	1052	AsyncClient.exe	31
PID 1052 wrote to memory of 2748	1052	AsyncClient.exe	31
PID 1052 wrote to memory of 2756	1052	AsyncClient.exe	33
PID 1052 wrote to memory of 2756	1052	AsyncClient.exe	33
PID 1052 wrote to memory of 2756	1052	AsyncClient.exe	33
PID 1052 wrote to memory of 2756	1052	AsyncClient.exe	33
PID 2756 wrote to memory of 2188	2756	cmd.exe	35
PID 2756 wrote to memory of 2188	2756	cmd.exe	35
PID 2756 wrote to memory of 2188	2756	cmd.exe	35
PID 2756 wrote to memory of 2188	2756	cmd.exe	35
PID 2748 wrote to memory of 2852	2748	cmd.exe	36
PID 2748 wrote to memory of 2852	2748	cmd.exe	36
PID 2748 wrote to memory of 2852	2748	cmd.exe	36
PID 2748 wrote to memory of 2852	2748	cmd.exe	36
PID 2756 wrote to memory of 2920	2756	cmd.exe	37
PID 2756 wrote to memory of 2920	2756	cmd.exe	37
PID 2756 wrote to memory of 2920	2756	cmd.exe	37
PID 2756 wrote to memory of 2920	2756	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:1052
- 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:2748
- - 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:2852
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpF4F9.tmp.bat""
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2756
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2188
- - 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:2920

C:\Windows\explorer.exe
"C:\Windows\explorer.exe"
1⤵
PID:2240

C:\Windows\system32\AUDIODG.EXE
C:\Windows\system32\AUDIODG.EXE 0x464
1⤵
- Suspicious use of AdjustPrivilegeToken
PID:1600

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\tmpF4F9.tmp.bat

Filesize
147B

MD5
23eeac2913b96d0e9e76f9423328a852

SHA1
045878f0b10e87bdf23fbcbd5e9509580b481ad0

SHA256
4915ebf5124e51a790702ba36f9dcc7f9ea4fe839704b71a2bb01165f6bb298f

SHA512
a282033849d3e2422c680c5d5649503fcb8ebfae4824ef3811ea74c96339fe954a2781b371a0bf095d30d3ba6d32c7b9256e09ff57aa6a5f7dcbbb262e236623

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

Filesize
47KB

MD5
84ce795a60f779cc933bf3cc6e794fa2

SHA1
a67cbd9ab868d1b07cc882c6235f0f2e4dad0bb9

SHA256
c61af51a2fd8fc0e50206237844a14b5d5fbab5fb9963ac579d292e864f7799d

SHA512
3651fe88baf783f25ae5fad59e24c340895f6db8d0c57497d07cd46681ee7fc94364e436764245c3fad6f4f90414ac21efb66b37ebac0d58a4db31edc2b33bfa

Download Submit
memory/1052-0-0x0000000073EDE000-0x0000000073EDF000-memory.dmp

Filesize
4KB

Download
memory/1052-1-0x0000000000240000-0x0000000000252000-memory.dmp

Filesize
72KB

Download
memory/1052-2-0x0000000073ED0000-0x00000000745BE000-memory.dmp

Filesize
6.9MB

Download
memory/1052-12-0x0000000073ED0000-0x00000000745BE000-memory.dmp

Filesize
6.9MB

Download
memory/2920-16-0x0000000000F70000-0x0000000000F82000-memory.dmp

Filesize
72KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads