asyncrat | a72a243ca862f09c197a135b15cc3081b7635cb1c78bb7f92daa932b78754b06

General

Target

Terminal_9235.exe
Size

51KB
MD5

7bc2e6b25bfafe16708196e844dc1476
SHA1

4689ebd58df0eaa8f21191f1e0aae0259a2a7497
SHA256

a72a243ca862f09c197a135b15cc3081b7635cb1c78bb7f92daa932b78754b06
SHA512

aef4619973c3d71ce6eda4f4c1d4be2dcd88fceaf48bf2b4efde7c762d3ac45a3d4900b33aea04dfbd40079a279efd7ea2505056f0828cdb364ee478627e9e6a
SSDEEP

1536:Wuir1TUKP2nwcvaOgnQtobdZ/CyiUdF2:WuiJTUKP2rS3n5bd/j2

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

Mutex

8TdjLZxCzOjI

Attributes

delay
3
install
true
install_file
client.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

Processes:

resource	yara_rule
C:\Users\Admin\AppData\Roaming\client.exe	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

Processes:

Terminal_9235.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2437139445-1151884604-3026847218-1000\Control Panel\International\Geo\Nation	Terminal_9235.exe

Executes dropped EXE 1 IoCs

Processes:

client.exe

pid process

1764 client.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

pid	process
1764	client.exe

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

Processes:

Terminal_9235.execmd.execmd.exeschtasks.exetimeout.execlient.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Terminal_9235.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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	client.exe

Delays execution with timeout.exe 1 IoCs
evasion

Processes:

timeout.exe

pid process

4312 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

Processes:

schtasks.exe

pid process

1092 schtasks.exe

pid	process
4312	timeout.exe

pid	process
1092	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

Processes:

Terminal_9235.exe

pid	process
1584	Terminal_9235.exe
1584	Terminal_9235.exe
1584	Terminal_9235.exe
1584	Terminal_9235.exe
1584	Terminal_9235.exe
1584	Terminal_9235.exe
1584	Terminal_9235.exe
1584	Terminal_9235.exe
1584	Terminal_9235.exe
1584	Terminal_9235.exe
1584	Terminal_9235.exe
1584	Terminal_9235.exe
1584	Terminal_9235.exe
1584	Terminal_9235.exe
1584	Terminal_9235.exe
1584	Terminal_9235.exe
1584	Terminal_9235.exe
1584	Terminal_9235.exe
1584	Terminal_9235.exe
1584	Terminal_9235.exe
1584	Terminal_9235.exe
1584	Terminal_9235.exe
1584	Terminal_9235.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Terminal_9235.execlient.exe

description pid process

Token: SeDebugPrivilege 1584 Terminal_9235.exe
Token: SeDebugPrivilege 1764 client.exe

description	pid	process
Token: SeDebugPrivilege	1584	Terminal_9235.exe
Token: SeDebugPrivilege	1764	client.exe

Suspicious use of WriteProcessMemory 15 IoCs

Processes:

Terminal_9235.execmd.execmd.exe

description	pid	process	target process
PID 1584 wrote to memory of 1308	1584	Terminal_9235.exe	cmd.exe
PID 1584 wrote to memory of 1308	1584	Terminal_9235.exe	cmd.exe
PID 1584 wrote to memory of 1308	1584	Terminal_9235.exe	cmd.exe
PID 1584 wrote to memory of 2176	1584	Terminal_9235.exe	cmd.exe
PID 1584 wrote to memory of 2176	1584	Terminal_9235.exe	cmd.exe
PID 1584 wrote to memory of 2176	1584	Terminal_9235.exe	cmd.exe
PID 1308 wrote to memory of 1092	1308	cmd.exe	schtasks.exe
PID 1308 wrote to memory of 1092	1308	cmd.exe	schtasks.exe
PID 1308 wrote to memory of 1092	1308	cmd.exe	schtasks.exe
PID 2176 wrote to memory of 4312	2176	cmd.exe	timeout.exe
PID 2176 wrote to memory of 4312	2176	cmd.exe	timeout.exe
PID 2176 wrote to memory of 4312	2176	cmd.exe	timeout.exe
PID 2176 wrote to memory of 1764	2176	cmd.exe	client.exe
PID 2176 wrote to memory of 1764	2176	cmd.exe	client.exe
PID 2176 wrote to memory of 1764	2176	cmd.exe	client.exe

C:\Users\Admin\AppData\Local\Temp\Terminal_9235.exe
"C:\Users\Admin\AppData\Local\Temp\Terminal_9235.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1584

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "client" /tr '"C:\Users\Admin\AppData\Roaming\client.exe"' & exit
2⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:1308

C:\Windows\SysWOW64\schtasks.exe
schtasks /create /f /sc onlogon /rl highest /tn "client" /tr '"C:\Users\Admin\AppData\Roaming\client.exe"'
3⤵
- System Location Discovery: System Language Discovery
- Scheduled Task/Job: Scheduled Task
PID:1092

C:\Windows\SysWOW64\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpC2F2.tmp.bat""
2⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2176

C:\Windows\SysWOW64\timeout.exe
timeout 3
3⤵
- System Location Discovery: System Language Discovery
- Delays execution with timeout.exe
PID:4312

C:\Users\Admin\AppData\Roaming\client.exe
"C:\Users\Admin\AppData\Roaming\client.exe"
3⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
PID:1764

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\tmpC2F2.tmp.bat

Filesize
150B

MD5
7d698826af6e95aa7854e25079aa388d

SHA1
83bfc40eccff712e75b11293dd07c4d0f16e7d42

SHA256
17d1e8cd678f7483cea457b6f9af5072481a6d268f955be37964df4b574b355e

SHA512
5f103939b786dc28c12bf821ab8155c8cba2a06753d7497eaed2d000a2435b4c8771114b706df35198c52c71ce772028194a0d679296805ac484e58fa2e0fce1

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

Filesize
51KB

MD5
7bc2e6b25bfafe16708196e844dc1476

SHA1
4689ebd58df0eaa8f21191f1e0aae0259a2a7497

SHA256
a72a243ca862f09c197a135b15cc3081b7635cb1c78bb7f92daa932b78754b06

SHA512
aef4619973c3d71ce6eda4f4c1d4be2dcd88fceaf48bf2b4efde7c762d3ac45a3d4900b33aea04dfbd40079a279efd7ea2505056f0828cdb364ee478627e9e6a

Download Submit
memory/1584-0-0x0000000074D3E000-0x0000000074D3F000-memory.dmp

Filesize
4KB

Download
memory/1584-1-0x0000000000FA0000-0x0000000000FB2000-memory.dmp

Filesize
72KB

Download
memory/1584-2-0x0000000074D30000-0x00000000754E0000-memory.dmp

Filesize
7.7MB

Download
memory/1584-3-0x0000000005A00000-0x0000000005A9C000-memory.dmp

Filesize
624KB

Download
memory/1584-8-0x0000000074D30000-0x00000000754E0000-memory.dmp

Filesize
7.7MB

Download
memory/1764-13-0x0000000074C80000-0x0000000075430000-memory.dmp

Filesize
7.7MB

Download
memory/1764-14-0x0000000074C80000-0x0000000075430000-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