asyncrat | e0f9ca55f06233cd4e2a7e4cf77fb678a9cff34b548c85ea7c2cdf7ede07270c

General

Target

AsyncClient1.exe
Size

47KB
MD5

f65631d6798eaa350884e4f996f7f6a9
SHA1

a913ae3757728dc296bc1076147eb840e887d8fc
SHA256

e0f9ca55f06233cd4e2a7e4cf77fb678a9cff34b548c85ea7c2cdf7ede07270c
SHA512

e0c73a639c5236a9cb1800732c736c3a3071e50660495517e43b55b815eb99d0faf74f04e3de79e9fa112b6a09721d178f3b3929585fbfdb5bee2cda95b6bd0e
SSDEEP

768:xuyxNTAoZjRWUJd9bmo2qL5+Cr96UGMRPIom7e7PesJ0bFm3sJsynjSY1zeBDZMx:xuyxNTAGL2xuCMOom7ebRubFm3kZlMdO

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

between-reprint.gl.at.ply.gg:5942

Mutex

CKnrCmvLB4KG

Attributes

delay
3
install
true
install_file
Windows.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

Processes:

resource	yara_rule
behavioral2/files/0x0007000000023cb6-12.dat	family_asyncrat

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

Processes:

AsyncClient1.exeWindows.exe

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	AsyncClient1.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	Windows.exe

Executes dropped EXE 1 IoCs

Processes:

Windows.exe

pid	Process
4136	Windows.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 10 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

Processes:

AsyncClient1.execmd.exeWindows.execmd.exeschtasks.execmd.exetimeout.exeschtasks.execmd.exetimeout.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AsyncClient1.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Windows.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	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 2 IoCs

evasion

Processes:

timeout.exetimeout.exe

pid	Process
5084	timeout.exe
4200	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

Processes:

schtasks.exe

pid	Process
1324	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

Processes:

AsyncClient1.exe

pid	Process
4196	AsyncClient1.exe
4196	AsyncClient1.exe
4196	AsyncClient1.exe
4196	AsyncClient1.exe
4196	AsyncClient1.exe
4196	AsyncClient1.exe
4196	AsyncClient1.exe
4196	AsyncClient1.exe
4196	AsyncClient1.exe
4196	AsyncClient1.exe
4196	AsyncClient1.exe
4196	AsyncClient1.exe
4196	AsyncClient1.exe
4196	AsyncClient1.exe
4196	AsyncClient1.exe
4196	AsyncClient1.exe
4196	AsyncClient1.exe
4196	AsyncClient1.exe
4196	AsyncClient1.exe
4196	AsyncClient1.exe
4196	AsyncClient1.exe
4196	AsyncClient1.exe
4196	AsyncClient1.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

AsyncClient1.exeWindows.exe

description	pid	Process
Token: SeDebugPrivilege	4196	AsyncClient1.exe
Token: SeDebugPrivilege	4136	Windows.exe
Token: SeDebugPrivilege	4136	Windows.exe

Suspicious use of WriteProcessMemory 27 IoCs

Processes:

AsyncClient1.execmd.execmd.exeWindows.execmd.execmd.exe

description	pid	Process	procid_target
PID 4196 wrote to memory of 844	4196	AsyncClient1.exe	90
PID 4196 wrote to memory of 844	4196	AsyncClient1.exe	90
PID 4196 wrote to memory of 844	4196	AsyncClient1.exe	90
PID 4196 wrote to memory of 3308	4196	AsyncClient1.exe	92
PID 4196 wrote to memory of 3308	4196	AsyncClient1.exe	92
PID 4196 wrote to memory of 3308	4196	AsyncClient1.exe	92
PID 3308 wrote to memory of 5084	3308	cmd.exe	94
PID 3308 wrote to memory of 5084	3308	cmd.exe	94
PID 3308 wrote to memory of 5084	3308	cmd.exe	94
PID 844 wrote to memory of 1324	844	cmd.exe	95
PID 844 wrote to memory of 1324	844	cmd.exe	95
PID 844 wrote to memory of 1324	844	cmd.exe	95
PID 3308 wrote to memory of 4136	3308	cmd.exe	98
PID 3308 wrote to memory of 4136	3308	cmd.exe	98
PID 3308 wrote to memory of 4136	3308	cmd.exe	98
PID 4136 wrote to memory of 1684	4136	Windows.exe	108
PID 4136 wrote to memory of 1684	4136	Windows.exe	108
PID 4136 wrote to memory of 1684	4136	Windows.exe	108
PID 4136 wrote to memory of 2548	4136	Windows.exe	110
PID 4136 wrote to memory of 2548	4136	Windows.exe	110
PID 4136 wrote to memory of 2548	4136	Windows.exe	110
PID 2548 wrote to memory of 4200	2548	cmd.exe	112
PID 2548 wrote to memory of 4200	2548	cmd.exe	112
PID 2548 wrote to memory of 4200	2548	cmd.exe	112
PID 1684 wrote to memory of 3236	1684	cmd.exe	113
PID 1684 wrote to memory of 3236	1684	cmd.exe	113
PID 1684 wrote to memory of 3236	1684	cmd.exe	113

C:\Users\Admin\AppData\Local\Temp\AsyncClient1.exe
"C:\Users\Admin\AppData\Local\Temp\AsyncClient1.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4196
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Windows" /tr '"C:\Users\Admin\AppData\Roaming\Windows.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:844
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "Windows" /tr '"C:\Users\Admin\AppData\Roaming\Windows.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:1324
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpBB3.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3308
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:5084
- - C:\Users\Admin\AppData\Roaming\Windows.exe
    "C:\Users\Admin\AppData\Roaming\Windows.exe"
    3⤵
    - Checks computer location settings
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:4136
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /delete /f /tn "Windows"
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:1684
    - - C:\Windows\SysWOW64\schtasks.exe
        
        schtasks /delete /f /tn "Windows"
        5⤵
        System Location Discovery: System Language Discovery
        
        PID:3236
  - - C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp4414.tmp.bat""
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:2548
    - - C:\Windows\SysWOW64\timeout.exe
        
        timeout 3
        5⤵
        System Location Discovery: System Language Discovery
        Delays execution with timeout.exe
        
        PID:4200

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

Query Registry

1

T1012

System Information Discovery

2

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\tmp4414.tmp.bat

Filesize
156B

MD5
641a33a4fb1fde7e0a26177516746334

SHA1
c9d3cc55ba270e840f9c4de62e59a9d1c0e7ae13

SHA256
161e83e817ff928f3ce0ac7416203d77ec9a071dbe541056b6ea728b67f426f8

SHA512
703f217646800741fa9f2ebc67ee5aa1c2ae8452a460ab0f1b4d7974a4d94351f6573ea319f561f944d2b05a9cc84b609cc59cb181178d98e3503b8e0193ad24

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpBB3.tmp.bat

Filesize
150B

MD5
0bc3ec76093b770dc54fdf99daeef11c

SHA1
2ed4d7b2ab951b69f046a6b17ff7d26ddd47f54a

SHA256
d111db77567cb3aeffc17acac4557e5160d3be9e3d68e3084fd9b935414beddb

SHA512
37d541df37f39720cd14e3db086fba2da34f0e60586c6952255e98207a64ec406f2db6987c2771588f89cf50ae948e1c51db0739eacbd4c1a43ec6eccb5878ae

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

Filesize
47KB

MD5
f65631d6798eaa350884e4f996f7f6a9

SHA1
a913ae3757728dc296bc1076147eb840e887d8fc

SHA256
e0f9ca55f06233cd4e2a7e4cf77fb678a9cff34b548c85ea7c2cdf7ede07270c

SHA512
e0c73a639c5236a9cb1800732c736c3a3071e50660495517e43b55b815eb99d0faf74f04e3de79e9fa112b6a09721d178f3b3929585fbfdb5bee2cda95b6bd0e

Download Submit
memory/4136-20-0x0000000000BD0000-0x0000000000C34000-memory.dmp

Filesize
400KB

Download
memory/4136-14-0x00000000752F0000-0x0000000075AA0000-memory.dmp

Filesize
7.7MB

Download
memory/4136-17-0x0000000005EA0000-0x0000000006444000-memory.dmp

Filesize
5.6MB

Download
memory/4136-18-0x00000000752F0000-0x0000000075AA0000-memory.dmp

Filesize
7.7MB

Download
memory/4136-19-0x0000000000C50000-0x0000000000CC6000-memory.dmp

Filesize
472KB

Download
memory/4136-21-0x0000000006690000-0x00000000066AE000-memory.dmp

Filesize
120KB

Download
memory/4136-25-0x00000000752F0000-0x0000000075AA0000-memory.dmp

Filesize
7.7MB

Download
memory/4196-4-0x0000000005230000-0x00000000052CC000-memory.dmp

Filesize
624KB

Download
memory/4196-9-0x00000000753A0000-0x0000000075B50000-memory.dmp

Filesize
7.7MB

Download
memory/4196-3-0x0000000004DE0000-0x0000000004E46000-memory.dmp

Filesize
408KB

Download
memory/4196-2-0x00000000753A0000-0x0000000075B50000-memory.dmp

Filesize
7.7MB

Download
memory/4196-0-0x00000000753AE000-0x00000000753AF000-memory.dmp

Filesize
4KB

Download
memory/4196-1-0x00000000003F0000-0x0000000000402000-memory.dmp

Filesize
72KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads