asyncrat | e52cb5639053380e69f7aa09480074e1a70b483d4aaa2a6fd91fe841cfc0e3ac

General

Target

AsyncClient.exe
Size

47KB
MD5

a09c04205b257d735af9dcfe3b738200
SHA1

32de59d8780ba631797e4ee5decbb03602973c2a
SHA256

e52cb5639053380e69f7aa09480074e1a70b483d4aaa2a6fd91fe841cfc0e3ac
SHA512

51b69652f79ff206299f63e9f9131daa5a5f179a7adbfc33fada8584eff1213f6e6d23fec5ff307d531a6c5e3be51a2b7a82f1ebdc3a8f5c6eccdbb516232ce6
SSDEEP

768:QuQKNTREhzxrWUXrm5mo2q7KjjmvdCPPIEAqda0bkP5+ucqXEebKB4N8svtlBDZy:QuQKNTR+W27u/DqdFbkP4TqFbKB4N8EU

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

127.0.0.1:61882

rahyufgsaf-61882.portmap.host:6606

rahyufgsaf-61882.portmap.host:7707

rahyufgsaf-61882.portmap.host:8808

rahyufgsaf-61882.portmap.host:61882

Mutex

C5wjgUHIBgq3

Attributes

delay
3
install
true
install_file
roar.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/0x0009000000023cc5-12.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-1-5-21-3227495264-2217614367-4027411560-1000\Control Panel\International\Geo\Nation	AsyncClient.exe

Executes dropped EXE 1 IoCs

pid	Process
5116	roar.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	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	roar.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

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
1072	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
1128	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
32	AsyncClient.exe
32	AsyncClient.exe
32	AsyncClient.exe
32	AsyncClient.exe
32	AsyncClient.exe
32	AsyncClient.exe
32	AsyncClient.exe
32	AsyncClient.exe
32	AsyncClient.exe
32	AsyncClient.exe
32	AsyncClient.exe
32	AsyncClient.exe
32	AsyncClient.exe
32	AsyncClient.exe
32	AsyncClient.exe
32	AsyncClient.exe
32	AsyncClient.exe
32	AsyncClient.exe
32	AsyncClient.exe
32	AsyncClient.exe
32	AsyncClient.exe
32	AsyncClient.exe
32	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	32	AsyncClient.exe
Token: SeDebugPrivilege	5116	roar.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 32 wrote to memory of 3168	32	AsyncClient.exe	83
PID 32 wrote to memory of 3168	32	AsyncClient.exe	83
PID 32 wrote to memory of 3168	32	AsyncClient.exe	83
PID 32 wrote to memory of 860	32	AsyncClient.exe	85
PID 32 wrote to memory of 860	32	AsyncClient.exe	85
PID 32 wrote to memory of 860	32	AsyncClient.exe	85
PID 860 wrote to memory of 1072	860	cmd.exe	87
PID 860 wrote to memory of 1072	860	cmd.exe	87
PID 860 wrote to memory of 1072	860	cmd.exe	87
PID 3168 wrote to memory of 1128	3168	cmd.exe	88
PID 3168 wrote to memory of 1128	3168	cmd.exe	88
PID 3168 wrote to memory of 1128	3168	cmd.exe	88
PID 860 wrote to memory of 5116	860	cmd.exe	89
PID 860 wrote to memory of 5116	860	cmd.exe	89
PID 860 wrote to memory of 5116	860	cmd.exe	89

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:32
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "roar" /tr '"C:\Users\Admin\AppData\Roaming\roar.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3168
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "roar" /tr '"C:\Users\Admin\AppData\Roaming\roar.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:1128
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpDC95.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:860
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:1072
- - C:\Users\Admin\AppData\Roaming\roar.exe
    "C:\Users\Admin\AppData\Roaming\roar.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:5116

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\tmpDC95.tmp.bat

Filesize
148B

MD5
061c7ee952f2d853ef06aeb6231b6f38

SHA1
5618e978f80052ecd104cc52f5ffadcc0a4531b8

SHA256
1e8232e0fb63412720d7245a611c85327c487fbcc657da72475e6fea06e16d0f

SHA512
781537ecfc06f405fd5fe7bb1abdb5e2b0bf54878790e549d5e1675a0d529c0624862aed6c794e6bbce6a579c6acb7105482c686bf71d8ec2c4f7f0569009b83

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

Filesize
47KB

MD5
a09c04205b257d735af9dcfe3b738200

SHA1
32de59d8780ba631797e4ee5decbb03602973c2a

SHA256
e52cb5639053380e69f7aa09480074e1a70b483d4aaa2a6fd91fe841cfc0e3ac

SHA512
51b69652f79ff206299f63e9f9131daa5a5f179a7adbfc33fada8584eff1213f6e6d23fec5ff307d531a6c5e3be51a2b7a82f1ebdc3a8f5c6eccdbb516232ce6

Download Submit
memory/32-0-0x0000000074DFE000-0x0000000074DFF000-memory.dmp

Filesize
4KB

Download
memory/32-1-0x00000000003F0000-0x0000000000402000-memory.dmp

Filesize
72KB

Download
memory/32-2-0x0000000074DF0000-0x00000000755A0000-memory.dmp

Filesize
7.7MB

Download
memory/32-3-0x0000000004DD0000-0x0000000004E36000-memory.dmp

Filesize
408KB

Download
memory/32-4-0x0000000005220000-0x00000000052BC000-memory.dmp

Filesize
624KB

Download
memory/32-9-0x0000000074DF0000-0x00000000755A0000-memory.dmp

Filesize
7.7MB

Download
memory/5116-14-0x0000000074D40000-0x00000000754F0000-memory.dmp

Filesize
7.7MB

Download
memory/5116-15-0x0000000074D40000-0x00000000754F0000-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