asyncrat | a58f4b7cff7b27cd1565c85f638071671cfe7fe40a162a365ad18512488dfb4d

General

Target

AsyncClient.exe
Size

47KB
MD5

f826bed80bd47afaae707ca60525087d
SHA1

cfc70fd56b4114cf146406a4ebbbfba25e5e97f0
SHA256

a58f4b7cff7b27cd1565c85f638071671cfe7fe40a162a365ad18512488dfb4d
SHA512

aa0ab0511fce8f520b7a501c15b673638cdaa1bd2d1e9e36e5c5b66d44fce62a67a02465c74edfdec88b2fd1727d1ed78c3200d410a88e9f75698028de848b01
SSDEEP

768:tuTAlTP3IwK2WUwv2Mmo2qBIWRoXXPILBO1d+iv0bI/1s+I06boqtmsvwO9lBDZZ:tuTAlTPrg2AoALkMbI/1OrMqtZDdvx

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

A5dbA4ZoyZMW

Attributes

delay
3
install
true
install_file
helloo.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
behavioral2/files/0x000b000000023b7e-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-1-5-21-1045960512-3948844814-3059691613-1000\Control Panel\International\Geo\Nation	AsyncClient.exe

Executes dropped EXE 1 IoCs

pid	Process
2236	helloo.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	helloo.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
4896	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
2624	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
2184	AsyncClient.exe
2184	AsyncClient.exe
2184	AsyncClient.exe
2184	AsyncClient.exe
2184	AsyncClient.exe
2184	AsyncClient.exe
2184	AsyncClient.exe
2184	AsyncClient.exe
2184	AsyncClient.exe
2184	AsyncClient.exe
2184	AsyncClient.exe
2184	AsyncClient.exe
2184	AsyncClient.exe
2184	AsyncClient.exe
2184	AsyncClient.exe
2184	AsyncClient.exe
2184	AsyncClient.exe
2184	AsyncClient.exe
2184	AsyncClient.exe
2184	AsyncClient.exe
2184	AsyncClient.exe
2184	AsyncClient.exe
2184	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2184	AsyncClient.exe
Token: SeDebugPrivilege	2236	helloo.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 2184 wrote to memory of 2232	2184	AsyncClient.exe	86
PID 2184 wrote to memory of 2232	2184	AsyncClient.exe	86
PID 2184 wrote to memory of 2232	2184	AsyncClient.exe	86
PID 2184 wrote to memory of 392	2184	AsyncClient.exe	88
PID 2184 wrote to memory of 392	2184	AsyncClient.exe	88
PID 2184 wrote to memory of 392	2184	AsyncClient.exe	88
PID 392 wrote to memory of 4896	392	cmd.exe	90
PID 392 wrote to memory of 4896	392	cmd.exe	90
PID 392 wrote to memory of 4896	392	cmd.exe	90
PID 2232 wrote to memory of 2624	2232	cmd.exe	91
PID 2232 wrote to memory of 2624	2232	cmd.exe	91
PID 2232 wrote to memory of 2624	2232	cmd.exe	91
PID 392 wrote to memory of 2236	392	cmd.exe	92
PID 392 wrote to memory of 2236	392	cmd.exe	92
PID 392 wrote to memory of 2236	392	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:2184
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "helloo" /tr '"C:\Users\Admin\AppData\Roaming\helloo.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2232
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "helloo" /tr '"C:\Users\Admin\AppData\Roaming\helloo.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2624
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp8E36.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:392
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:4896
- - C:\Users\Admin\AppData\Roaming\helloo.exe
    "C:\Users\Admin\AppData\Roaming\helloo.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2236

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\tmp8E36.tmp.bat

Filesize
150B

MD5
db5a5c2b2ca63ea97c9fa17b015a3585

SHA1
81d1308c6db3ebf46b7e05b0b0bb591e52080d2b

SHA256
836dff0fef2e8e8484d167ff56177dbf196f93c286ea47e010b581e3a93a390e

SHA512
9c5cf1012b244a97240492021a336180af368147dd1c8cfbcbcf468ecfb31f1f8988b9cba9bcf5b404270313a61caad331ff01044ac7dfbac4ad469d5cfb266f

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

Filesize
47KB

MD5
f826bed80bd47afaae707ca60525087d

SHA1
cfc70fd56b4114cf146406a4ebbbfba25e5e97f0

SHA256
a58f4b7cff7b27cd1565c85f638071671cfe7fe40a162a365ad18512488dfb4d

SHA512
aa0ab0511fce8f520b7a501c15b673638cdaa1bd2d1e9e36e5c5b66d44fce62a67a02465c74edfdec88b2fd1727d1ed78c3200d410a88e9f75698028de848b01

Download Submit
memory/2184-0-0x000000007446E000-0x000000007446F000-memory.dmp

Filesize
4KB

Download
memory/2184-1-0x00000000005C0000-0x00000000005D2000-memory.dmp

Filesize
72KB

Download
memory/2184-2-0x0000000074460000-0x0000000074C10000-memory.dmp

Filesize
7.7MB

Download
memory/2184-3-0x0000000005020000-0x00000000050BC000-memory.dmp

Filesize
624KB

Download
memory/2184-9-0x0000000074460000-0x0000000074C10000-memory.dmp

Filesize
7.7MB

Download
memory/2236-13-0x00000000743C0000-0x0000000074B70000-memory.dmp

Filesize
7.7MB

Download
memory/2236-14-0x00000000743C0000-0x0000000074B70000-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