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 2 IoCs

rat

resource	yara_rule
behavioral2/files/0x000800000002441c-8.dat	family_asyncrat
behavioral2/memory/5072-10-0x00000000056D0000-0x00000000056E0000-memory.dmp	family_asyncrat

Checks computer location settings 2 TTPs 1 IoCs

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

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-204488895-2999877624-296153668-1000\Control Panel\International\Geo\Nation	tmpvc_7gggu.exe

Executes dropped EXE 2 IoCs

pid	Process
5072	AsyncClient.exe
4920	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	AsyncClient.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	tmpvc_7gggu.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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AsyncClient.exe

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
1052	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
1864	schtasks.exe

Suspicious behavior: EnumeratesProcesses 21 IoCs

pid	Process
1608	tmpvc_7gggu.exe
1608	tmpvc_7gggu.exe
1608	tmpvc_7gggu.exe
1608	tmpvc_7gggu.exe
1608	tmpvc_7gggu.exe
1608	tmpvc_7gggu.exe
1608	tmpvc_7gggu.exe
1608	tmpvc_7gggu.exe
1608	tmpvc_7gggu.exe
1608	tmpvc_7gggu.exe
1608	tmpvc_7gggu.exe
1608	tmpvc_7gggu.exe
1608	tmpvc_7gggu.exe
1608	tmpvc_7gggu.exe
1608	tmpvc_7gggu.exe
1608	tmpvc_7gggu.exe
1608	tmpvc_7gggu.exe
1608	tmpvc_7gggu.exe
1608	tmpvc_7gggu.exe
1608	tmpvc_7gggu.exe
1608	tmpvc_7gggu.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1608	tmpvc_7gggu.exe
Token: SeDebugPrivilege	5072	AsyncClient.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 1608 wrote to memory of 3080	1608	tmpvc_7gggu.exe	89
PID 1608 wrote to memory of 2940	1608	tmpvc_7gggu.exe	91
PID 2940 wrote to memory of 1052	2940	cmd.exe	94
PID 3080 wrote to memory of 1864	3080	cmd.exe	93
PID 2940 wrote to memory of 4920	2940	cmd.exe	100

C:\Users\Admin\AppData\Local\Temp\tmpvc_7gggu.exe
"C:\Users\Admin\AppData\Local\Temp\tmpvc_7gggu.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1608
- 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:3080
- - 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:1864
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp439C.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2940
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:1052
- - 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:4920

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:5072

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

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

Replay Monitor

Loading Replay Monitor...

Downloads

tmp439C.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp439C.tmp.bat
Size 155B
SHA256 6cd907d00c614ac3880e254275bb2ffe9f15f03b9cbe0650c7174707ae244777
MD5 4b44580dd12a9a46b444c9d238cffd40
SHA1 586de5fbf52c68e999e66be012a84daa2cb31519
SHA512 49dd3fab1c81e3f55932693287197ad9a70de65f190b759260b80f6d131ce7c1c38ce5c4b88dc3b6db2f459041668157d1fb26283b998f66b0c5ff46049764d4
TLSH
T1DFC08C42A2C6BA6E6806346302BAD4CCA1B6A82D3E44AB50C308859D5280659E0AD241
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/1608-0-0x00000000006C0000-0x00000000006D2000-memory.dmp

Download

memory/1608-1-0x0000000005180000-0x0000000005190000-memory.dmp

Download

memory/1608-2-0x00000000050C0000-0x000000000515C000-memory.dmp

Download

memory/5072-10-0x00000000056D0000-0x00000000056E0000-memory.dmp

Download

memory/5072-13-0x00000000056D0000-0x00000000056E0000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads