asyncrat | 04e28b3577b777c90748800fdc7ba768f975de04d69db12507424836a833ed5f

Analysis

max time kernel
109s
max time network
109s
platform
windows10-2004_x64
resource
win10v2004-20240709-en
resource tags

arch:x64arch:x86image:win10v2004-20240709-enlocale:en-usos:windows10-2004-x64system
submitted
30-07-2024 13:44

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Reason

Machine shutdown

Report Analysis Logs

General

Target

AsyncClient.exe
Size

47KB
MD5

340b6e67b56c0ab3ade096afcdfc927d
SHA1

2832d508923419e12140d519d04b1c10c7f48dd9
SHA256

04e28b3577b777c90748800fdc7ba768f975de04d69db12507424836a833ed5f
SHA512

f1fee2b31ec875fe2ebbe91fae624867b6ed2e2ca0b52d80d6abdea3af50d98cc607ed1178e4d8bc67623f42ccaf71980035fc7e7ca196463e05c3097a48689a
SSDEEP

768:Eu6XdTvER+SWUk6P4mo2qbn4v+6jxoOCqgPISgNS0bOjV/AguliyQoprGQqos6Bc:Eu6XdTv2S2DvyOCUSgvbOOrircBzbd8x

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

31.173.170.243:7777

Mutex

gN3M5j6PORs8

Attributes

delay
3
install
true
install_file
test.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/0x000200000001e78e-12.dat	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-1-5-21-464762018-485119342-1613148473-1000\Control Panel\International\Geo\Nation	AsyncClient.exe

Executes dropped EXE 1 IoCs

pid	Process
2776	test.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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	test.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AsyncClient.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Checks SCSI registry key(s) 3 TTPs 3 IoCs

SCSI information is often read in order to detect sandboxing environments.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_DADY&Prod_HARDDISK\4&215468a5&0&000000	taskmgr.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_DADY&Prod_HARDDISK\4&215468a5&0&000000\Properties\{b725f130-47ef-101a-a5f1-02608c9eebac}\000A	taskmgr.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_DADY&Prod_HARDDISK\4&215468a5&0&000000\FriendlyName	taskmgr.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
3900	timeout.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-464762018-485119342-1613148473-1000_Classes\Local Settings	taskmgr.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
2056	schtasks.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

pid	Process
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4764	AsyncClient.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
4436	taskmgr.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeDebugPrivilege	4764	AsyncClient.exe
Token: SeDebugPrivilege	2776	test.exe
Token: SeDebugPrivilege	2776	test.exe
Token: SeDebugPrivilege	4436	taskmgr.exe
Token: SeSystemProfilePrivilege	4436	taskmgr.exe
Token: SeCreateGlobalPrivilege	4436	taskmgr.exe

Suspicious use of FindShellTrayWindow 64 IoCs

pid	Process
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe

Suspicious use of SendNotifyMessage 64 IoCs

pid	Process
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe
4436	taskmgr.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4764 wrote to memory of 4684	4764	AsyncClient.exe	90
PID 4764 wrote to memory of 4684	4764	AsyncClient.exe	90
PID 4764 wrote to memory of 4684	4764	AsyncClient.exe	90
PID 4764 wrote to memory of 4864	4764	AsyncClient.exe	92
PID 4764 wrote to memory of 4864	4764	AsyncClient.exe	92
PID 4764 wrote to memory of 4864	4764	AsyncClient.exe	92
PID 4864 wrote to memory of 3900	4864	cmd.exe	95
PID 4864 wrote to memory of 3900	4864	cmd.exe	95
PID 4864 wrote to memory of 3900	4864	cmd.exe	95
PID 4684 wrote to memory of 2056	4684	cmd.exe	94
PID 4684 wrote to memory of 2056	4684	cmd.exe	94
PID 4684 wrote to memory of 2056	4684	cmd.exe	94
PID 4864 wrote to memory of 2776	4864	cmd.exe	99
PID 4864 wrote to memory of 2776	4864	cmd.exe	99
PID 4864 wrote to memory of 2776	4864	cmd.exe	99

C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe
"C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4764
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "test" /tr '"C:\Users\Admin\AppData\Roaming\test.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4684
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "test" /tr '"C:\Users\Admin\AppData\Roaming\test.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2056
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpD4F3.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4864
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:3900
- - C:\Users\Admin\AppData\Roaming\test.exe
    "C:\Users\Admin\AppData\Roaming\test.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2776

C:\Windows\system32\taskmgr.exe
"C:\Windows\system32\taskmgr.exe" /4
1⤵
- Checks SCSI registry key(s)
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
PID:4436

C:\Windows\System32\rundll32.exe
C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
1⤵
PID:5676

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmpD4F3.tmp.bat

Filesize
148B

MD5
6ffde9c89bd16e99aa088766fe6770f6

SHA1
5e327a46e836b258271f0c39beea116f9c9d1580

SHA256
8c3bbd64c38948a8c7bd0ae09960829b33d721cdc0eb29baaae78f6e53097600

SHA512
50996d93a06bdf381d4edfc26e8e9664f38f317d28693380c72bd56535c362093ef32cbb31e686b48e761a7e4c5c0213f328fd2ec812ceee3a318baa1e63d57b

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

Filesize
47KB

MD5
340b6e67b56c0ab3ade096afcdfc927d

SHA1
2832d508923419e12140d519d04b1c10c7f48dd9

SHA256
04e28b3577b777c90748800fdc7ba768f975de04d69db12507424836a833ed5f

SHA512
f1fee2b31ec875fe2ebbe91fae624867b6ed2e2ca0b52d80d6abdea3af50d98cc607ed1178e4d8bc67623f42ccaf71980035fc7e7ca196463e05c3097a48689a

Download Submit
memory/2776-30-0x00000000065E0000-0x0000000006B84000-memory.dmp

Filesize
5.6MB

Download
memory/2776-35-0x0000000074EB0000-0x0000000075660000-memory.dmp

Filesize
7.7MB

Download
memory/2776-34-0x0000000006EC0000-0x0000000006F52000-memory.dmp

Filesize
584KB

Download
memory/2776-33-0x0000000006D90000-0x0000000006DAE000-memory.dmp

Filesize
120KB

Download
memory/2776-32-0x0000000006570000-0x00000000065D8000-memory.dmp

Filesize
416KB

Download
memory/2776-31-0x0000000006D10000-0x0000000006D86000-memory.dmp

Filesize
472KB

Download
memory/2776-14-0x0000000074EB0000-0x0000000075660000-memory.dmp

Filesize
7.7MB

Download
memory/4436-21-0x000001F455900000-0x000001F455901000-memory.dmp

Filesize
4KB

Download
memory/4436-23-0x000001F455900000-0x000001F455901000-memory.dmp

Filesize
4KB

Download
memory/4436-15-0x000001F455900000-0x000001F455901000-memory.dmp

Filesize
4KB

Download
memory/4436-27-0x000001F455900000-0x000001F455901000-memory.dmp

Filesize
4KB

Download
memory/4436-26-0x000001F455900000-0x000001F455901000-memory.dmp

Filesize
4KB

Download
memory/4436-25-0x000001F455900000-0x000001F455901000-memory.dmp

Filesize
4KB

Download
memory/4436-24-0x000001F455900000-0x000001F455901000-memory.dmp

Filesize
4KB

Download
memory/4436-16-0x000001F455900000-0x000001F455901000-memory.dmp

Filesize
4KB

Download
memory/4436-22-0x000001F455900000-0x000001F455901000-memory.dmp

Filesize
4KB

Download
memory/4436-17-0x000001F455900000-0x000001F455901000-memory.dmp

Filesize
4KB

Download
memory/4764-0-0x0000000074F5E000-0x0000000074F5F000-memory.dmp

Filesize
4KB

Download
memory/4764-9-0x0000000074F50000-0x0000000075700000-memory.dmp

Filesize
7.7MB

Download
memory/4764-4-0x0000000005750000-0x00000000057EC000-memory.dmp

Filesize
624KB

Download
memory/4764-3-0x0000000005280000-0x00000000052E6000-memory.dmp

Filesize
408KB

Download
memory/4764-2-0x0000000074F50000-0x0000000075700000-memory.dmp

Filesize
7.7MB

Download
memory/4764-1-0x0000000000A30000-0x0000000000A42000-memory.dmp

Filesize
72KB

Download

Analysis

Sharing

Errors

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads