asyncrat | 48bde4699929b1f27b592ae5ed0503feff7948b2287978c46d212ed48bd740bf

General

Target
tmpvc_7gggu.exe
Size 45KB
Sample260602-krk38ahs4w
SHA256 48bde4699929b1f27b592ae5ed0503feff7948b2287978c46d212ed48bd740bf
MD5 a28c9241c817ab43fdce8d49816675c4
SHA1 18c03ff9b5afa7e600683585b5568a6554eb214e
SHA512 3b88af4eec726f3f8b087e0787fd8d78651afedf6e1193f6a1a3e554bbe538d41b2bb77c307132787e342df40edbe416706b9bd39aa238153d10ef02b666bb9b
SSDEEP 768:5uifo9Tg4xr5WUx9tDmo2qrTKObQPITzjbqgX3iu9ZTWjNo40BDZLx:5uqo9Tg+L27kVT3b9XSu9ZTWyZdLx
TLSH
T1A5231B003BE88227F2BE5F78ACF26105857AF6632603D9892CC455D75613FC68A536FE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

default defense_evasion discovery execution asyncrat persistence rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

xnhau.ing:443
www.xnhau.ing:443

Mutex

AxJO5FKccQG6

Attributes

delay
0
install
true
install_file
AsyncClient.exe
install_folder
%AppData%

aes.plain

Signatures

Family: 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
behavioral3/files/0x000300000002a216-8.dat	family_asyncrat

Executes dropped EXE 2 IoCs

pid	Process
4744	AsyncClient.exe
1684	AsyncClient.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 7 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	cmd.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	AsyncClient.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AsyncClient.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	tmpvc_7gggu.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
1876	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
1940	schtasks.exe

Suspicious behavior: EnumeratesProcesses 19 IoCs

pid	Process
2828	tmpvc_7gggu.exe
2828	tmpvc_7gggu.exe
2828	tmpvc_7gggu.exe
2828	tmpvc_7gggu.exe
2828	tmpvc_7gggu.exe
2828	tmpvc_7gggu.exe
2828	tmpvc_7gggu.exe
2828	tmpvc_7gggu.exe
2828	tmpvc_7gggu.exe
2828	tmpvc_7gggu.exe
2828	tmpvc_7gggu.exe
2828	tmpvc_7gggu.exe
2828	tmpvc_7gggu.exe
2828	tmpvc_7gggu.exe
2828	tmpvc_7gggu.exe
2828	tmpvc_7gggu.exe
2828	tmpvc_7gggu.exe
2828	tmpvc_7gggu.exe
2828	tmpvc_7gggu.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2828	tmpvc_7gggu.exe
Token: SeDebugPrivilege	4744	AsyncClient.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 2828 wrote to memory of 5024	2828	tmpvc_7gggu.exe	82
PID 2828 wrote to memory of 1476	2828	tmpvc_7gggu.exe	83
PID 1476 wrote to memory of 1876	1476	cmd.exe	86
PID 5024 wrote to memory of 1940	5024	cmd.exe	87
PID 1476 wrote to memory of 1684	1476	cmd.exe	90

C:\Users\Admin\AppData\Local\Temp\tmpvc_7gggu.exe
"C:\Users\Admin\AppData\Local\Temp\tmpvc_7gggu.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2828
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "AsyncClient" /tr '"C:\Users\Admin\AppData\Roaming\AsyncClient.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5024
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "AsyncClient" /tr '"C:\Users\Admin\AppData\Roaming\AsyncClient.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:1940
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp3553.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1476
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:1876
- - C:\Users\Admin\AppData\Roaming\AsyncClient.exe
    "C:\Users\Admin\AppData\Roaming\AsyncClient.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:1684

C:\Users\Admin\AppData\Roaming\AsyncClient.exe
"C:\Users\Admin\AppData\Roaming\AsyncClient.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:4744

Network

MITRE ATT&CK Enterprise v16

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

tmp3553.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp3553.tmp.bat
Size 155B
SHA256 ffef415d5b76456ba1c902328e1a2de3d134c079e6a3f8c1355f212668a82e7c
MD5 d15b6ebcd281b4d1c5c25605a8aa4533
SHA1 4934b7ef82243fa47411951f4af0a31b937c5457
SHA512 a018a3f46bbcb75bff68f74ff9f013ceeb6d656906106f165a96f92d9d2b5532f7239aa7e2845563edae19bf3de39de7c90b82a34235d146a87273c93eb96baa
TLSH
T1A5C08C42A6C5AA2E2C06746312BAE4CCA1B668693E45AB50C308805D628086AE1A9341
MD5 SHA1 SHA512 TLSH

Submit Download

AsyncClient.exe

Path C:\Users\Admin\AppData\Roaming\AsyncClient.exe
Size 45KB
SHA256 48bde4699929b1f27b592ae5ed0503feff7948b2287978c46d212ed48bd740bf
MD5 a28c9241c817ab43fdce8d49816675c4
SHA1 18c03ff9b5afa7e600683585b5568a6554eb214e
SHA512 3b88af4eec726f3f8b087e0787fd8d78651afedf6e1193f6a1a3e554bbe538d41b2bb77c307132787e342df40edbe416706b9bd39aa238153d10ef02b666bb9b
SSDEEP 768:5uifo9Tg4xr5WUx9tDmo2qrTKObQPITzjbqgX3iu9ZTWjNo40BDZLx:5uqo9Tg+L27kVT3b9XSu9ZTWyZdLx
TLSH
T1A5231B003BE88227F2BE5F78ACF26105857AF6632603D9892CC455D75613FC68A536FE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2828-0-0x0000000000E70000-0x0000000000E82000-memory.dmp

Download

memory/2828-1-0x0000000005720000-0x0000000005730000-memory.dmp

Download

memory/2828-2-0x00000000057D0000-0x000000000586C000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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