asyncrat | 44b6e2af6e5e547cfc9c2c3607bd7cda4785688b60720c5501968b536ce331c9

General

Target

AsyncClient.exe
Size

47KB
MD5

ee97dc0328ea5ef92cdadeb280891591
SHA1

916924ecdb96aa0ec227b12df2af8f5038f239ab
SHA256

44b6e2af6e5e547cfc9c2c3607bd7cda4785688b60720c5501968b536ce331c9
SHA512

52ecca0f00d47f9bffc50bb516988715ae2c1aaf96f3a5bb132619ebbd8a370c9eef0f33d5b67accc2ffe2187e60564fa353eef037b35be9159f17aad6e621c2
SSDEEP

768:Zu6ZdTAYhbJWUh9Nzmo2qLxRQSJPVW1QMCfPIKSxlJpmqH0bAYpHZ+6GGAPMtV0g:Zu6ZdTAur2uQadMC4KSrvUbAYqMAknkU

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

listed-academics.gl.at.ply.gg:10068

Mutex

f7BTmla4eysw

Attributes

delay
3
install
true
install_file
das.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

resource	yara_rule
behavioral1/files/0x002900000004507c-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-1-5-21-641261377-2215826147-608237349-1000\Control Panel\International\Geo\Nation	AsyncClient.exe

Executes dropped EXE 1 IoCs

pid	Process
5096	das.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	das.exe
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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
4616	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
4168	schtasks.exe

Suspicious behavior: EnumeratesProcesses 21 IoCs

pid	Process
1124	AsyncClient.exe
1124	AsyncClient.exe
1124	AsyncClient.exe
1124	AsyncClient.exe
1124	AsyncClient.exe
1124	AsyncClient.exe
1124	AsyncClient.exe
1124	AsyncClient.exe
1124	AsyncClient.exe
1124	AsyncClient.exe
1124	AsyncClient.exe
1124	AsyncClient.exe
1124	AsyncClient.exe
1124	AsyncClient.exe
1124	AsyncClient.exe
1124	AsyncClient.exe
1124	AsyncClient.exe
1124	AsyncClient.exe
1124	AsyncClient.exe
1124	AsyncClient.exe
1124	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1124	AsyncClient.exe
Token: SeDebugPrivilege	5096	das.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1124 wrote to memory of 2040	1124	AsyncClient.exe	85
PID 1124 wrote to memory of 2040	1124	AsyncClient.exe	85
PID 1124 wrote to memory of 2040	1124	AsyncClient.exe	85
PID 1124 wrote to memory of 824	1124	AsyncClient.exe	87
PID 1124 wrote to memory of 824	1124	AsyncClient.exe	87
PID 1124 wrote to memory of 824	1124	AsyncClient.exe	87
PID 824 wrote to memory of 4616	824	cmd.exe	89
PID 824 wrote to memory of 4616	824	cmd.exe	89
PID 824 wrote to memory of 4616	824	cmd.exe	89
PID 2040 wrote to memory of 4168	2040	cmd.exe	90
PID 2040 wrote to memory of 4168	2040	cmd.exe	90
PID 2040 wrote to memory of 4168	2040	cmd.exe	90
PID 824 wrote to memory of 5096	824	cmd.exe	92
PID 824 wrote to memory of 5096	824	cmd.exe	92
PID 824 wrote to memory of 5096	824	cmd.exe	92

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:1124
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "das" /tr '"C:\Users\Admin\AppData\Roaming\das.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2040
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "das" /tr '"C:\Users\Admin\AppData\Roaming\das.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:4168
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp8F9D.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:824
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:4616
- - C:\Users\Admin\AppData\Roaming\das.exe
    "C:\Users\Admin\AppData\Roaming\das.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:5096

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\tmp8F9D.tmp.bat

Filesize
147B

MD5
c96ea29b0759ab2364520953719f08a5

SHA1
d441c254c01f544ff85d78e0ef87f552593cbaa9

SHA256
b3d150795f312b6a63b0679dfc39427bdac70783b1ba7084569f349424814ae0

SHA512
40ebd9e6732c45d17a5a7c26ec5dcdfeecd5268f692b97555a5b48f7509c736d5dfb3df27478fd3d5137f63939618090de6b7940c8653be850edf722e60a6e5a

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

Filesize
47KB

MD5
ee97dc0328ea5ef92cdadeb280891591

SHA1
916924ecdb96aa0ec227b12df2af8f5038f239ab

SHA256
44b6e2af6e5e547cfc9c2c3607bd7cda4785688b60720c5501968b536ce331c9

SHA512
52ecca0f00d47f9bffc50bb516988715ae2c1aaf96f3a5bb132619ebbd8a370c9eef0f33d5b67accc2ffe2187e60564fa353eef037b35be9159f17aad6e621c2

Download Submit
memory/1124-0-0x000000007442E000-0x000000007442F000-memory.dmp

Filesize
4KB

Download
memory/1124-1-0x0000000000C40000-0x0000000000C52000-memory.dmp

Filesize
72KB

Download
memory/1124-2-0x0000000074420000-0x0000000074BD1000-memory.dmp

Filesize
7.7MB

Download
memory/1124-3-0x0000000005620000-0x00000000056BC000-memory.dmp

Filesize
624KB

Download
memory/1124-8-0x0000000074420000-0x0000000074BD1000-memory.dmp

Filesize
7.7MB

Download
memory/5096-16-0x0000000005B70000-0x0000000006116000-memory.dmp

Filesize
5.6MB

Download
memory/5096-13-0x0000000074370000-0x0000000074B21000-memory.dmp

Filesize
7.7MB

Download
memory/5096-17-0x0000000005690000-0x00000000056F6000-memory.dmp

Filesize
408KB

Download
memory/5096-18-0x0000000074370000-0x0000000074B21000-memory.dmp

Filesize
7.7MB

Download
memory/5096-19-0x00000000065E0000-0x0000000006656000-memory.dmp

Filesize
472KB

Download
memory/5096-20-0x0000000006560000-0x00000000065C8000-memory.dmp

Filesize
416KB

Download
memory/5096-21-0x00000000066A0000-0x00000000066BE000-memory.dmp

Filesize
120KB

Download
memory/5096-22-0x00000000069D0000-0x0000000006A62000-memory.dmp

Filesize
584KB

Download
memory/5096-23-0x00000000079D0000-0x0000000007A34000-memory.dmp

Filesize
400KB

Download
memory/5096-24-0x0000000007370000-0x0000000007402000-memory.dmp

Filesize
584KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads