asyncrat | 5cd5530ea7aea507cb7faf6f9049448252aebd2cd4a4ecd7f040a1c44274dbaf

General

Target

AsyncClient.exe
Size

59KB
MD5

7ffbcac612bf8f2c14d872af7e7c68a0
SHA1

46f7f128b782946f0ad74ed4a278a4c266e3ed5d
SHA256

5cd5530ea7aea507cb7faf6f9049448252aebd2cd4a4ecd7f040a1c44274dbaf
SHA512

4428df372dc50d285630883afec00fb375245ea52b36db976eadc513669d438e4eb398153e5f1317db8c92fd59cc418cafedc57db97b52b23190a11c0e4d71ad
SSDEEP

1536:8uk7VT0M912CVcPpD4zbkhc+eaT9VCbAHdMn25FyX/oah:8ukJT0ML2YcPizbk/998CK2P6/oah

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

127.0.0.1:6606

127.0.0.1:7707

127.0.0.1:8808

127.0.0.1:2020

Mutex

oOcKCLkOWt6j

Attributes

delay
3
install
true
install_file
Roblox.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
behavioral2/files/0x000c000000023410-11.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-1-5-21-945322488-2060912225-3527527000-1000\Control Panel\International\Geo\Nation	AsyncClient.exe

Executes dropped EXE 1 IoCs

pid	Process
4460	Roblox.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	AsyncClient.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	Roblox.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
3016	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
1840	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
2444	AsyncClient.exe
2444	AsyncClient.exe
2444	AsyncClient.exe
2444	AsyncClient.exe
2444	AsyncClient.exe
2444	AsyncClient.exe
2444	AsyncClient.exe
2444	AsyncClient.exe
2444	AsyncClient.exe
2444	AsyncClient.exe
2444	AsyncClient.exe
2444	AsyncClient.exe
2444	AsyncClient.exe
2444	AsyncClient.exe
2444	AsyncClient.exe
2444	AsyncClient.exe
2444	AsyncClient.exe
2444	AsyncClient.exe
2444	AsyncClient.exe
2444	AsyncClient.exe
2444	AsyncClient.exe
2444	AsyncClient.exe
2444	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2444	AsyncClient.exe
Token: SeDebugPrivilege	4460	Roblox.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 2444 wrote to memory of 5016	2444	AsyncClient.exe	92
PID 2444 wrote to memory of 5016	2444	AsyncClient.exe	92
PID 2444 wrote to memory of 5016	2444	AsyncClient.exe	92
PID 2444 wrote to memory of 3296	2444	AsyncClient.exe	94
PID 2444 wrote to memory of 3296	2444	AsyncClient.exe	94
PID 2444 wrote to memory of 3296	2444	AsyncClient.exe	94
PID 5016 wrote to memory of 1840	5016	cmd.exe	96
PID 5016 wrote to memory of 1840	5016	cmd.exe	96
PID 5016 wrote to memory of 1840	5016	cmd.exe	96
PID 3296 wrote to memory of 3016	3296	cmd.exe	97
PID 3296 wrote to memory of 3016	3296	cmd.exe	97
PID 3296 wrote to memory of 3016	3296	cmd.exe	97
PID 3296 wrote to memory of 4460	3296	cmd.exe	99
PID 3296 wrote to memory of 4460	3296	cmd.exe	99
PID 3296 wrote to memory of 4460	3296	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:2444
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Roblox" /tr '"C:\Users\Admin\AppData\Roaming\Roblox.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:5016
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "Roblox" /tr '"C:\Users\Admin\AppData\Roaming\Roblox.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:1840
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpA577.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3296
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:3016
- - C:\Users\Admin\AppData\Roaming\Roblox.exe
    "C:\Users\Admin\AppData\Roaming\Roblox.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:4460

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\tmpA577.tmp.bat

Filesize
150B

MD5
6bc7fe48c79b7b41aec959286fd819cc

SHA1
79e02b52a160d1e4cb3a62189c4ab5906d05bae6

SHA256
21954d85b9db6aa3a3024f9951360c2778b7cabbf57937daec320c17e9db44e0

SHA512
5d7fcd1fda3545c2d4507197e2124ac661a3aa88c73a57662d8f4f9858669525e73fd9c42c754dab5079b3f841fe944bcabc2fa21ac56b460045ea3a206cc1d2

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

Filesize
59KB

MD5
7ffbcac612bf8f2c14d872af7e7c68a0

SHA1
46f7f128b782946f0ad74ed4a278a4c266e3ed5d

SHA256
5cd5530ea7aea507cb7faf6f9049448252aebd2cd4a4ecd7f040a1c44274dbaf

SHA512
4428df372dc50d285630883afec00fb375245ea52b36db976eadc513669d438e4eb398153e5f1317db8c92fd59cc418cafedc57db97b52b23190a11c0e4d71ad

Download Submit
memory/2444-0-0x00000000749BE000-0x00000000749BF000-memory.dmp

Filesize
4KB

Download
memory/2444-1-0x00000000008B0000-0x00000000008C4000-memory.dmp

Filesize
80KB

Download
memory/2444-2-0x00000000749B0000-0x0000000075160000-memory.dmp

Filesize
7.7MB

Download
memory/2444-3-0x00000000052F0000-0x000000000538C000-memory.dmp

Filesize
624KB

Download
memory/2444-8-0x00000000749B0000-0x0000000075160000-memory.dmp

Filesize
7.7MB

Download
memory/4460-13-0x00000000749A0000-0x0000000075150000-memory.dmp

Filesize
7.7MB

Download
memory/4460-14-0x00000000749A0000-0x0000000075150000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads