asyncrat | 02d242ea2f9251a46c8fc7fdc8a7c00a64491f015b3b8dbe11ff7afaff3fa7c9

General

Target

AsyncClient.exe
Size

45KB
MD5

87b6917db381131a861ba84d4269b0bd
SHA1

801e58b238a02f2d0bb972ee230e77f4bfe4baa1
SHA256

02d242ea2f9251a46c8fc7fdc8a7c00a64491f015b3b8dbe11ff7afaff3fa7c9
SHA512

b297874e06ff77aa8115f9935a7b13fd34a472f904f960708f9c8c86881c6256834362fe8bbdee35914a132d9db4b5fc7f2fb6d418f042cbf5d8a89c5bf5fb6e
SSDEEP

768:/u67dTAYhbJWUh9Nzmo2qLIKjPGaG6PIyzjbFgX3iuzTMsfaP9c9CysmBDZER:/u67dTAur2RKTkDy3bCXSoMWaP9QjdER

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

149.143.127.81:6606

149.143.127.81:7707

149.143.127.81:8808

Mutex

RPDOrlBP5iQP

Attributes

delay
3
install
true
install_file
Update.exe
install_folder
%Temp%

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
behavioral1/files/0x001c00000002ab84-12.dat	family_asyncrat

Executes dropped EXE 1 IoCs

Processes:

Update.exe

pid	Process
2084	Update.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

Processes:

AsyncClient.execmd.execmd.exetimeout.exeschtasks.exeUpdate.exe

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	cmd.exe
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	Update.exe

Delays execution with timeout.exe 1 IoCs

evasion

Processes:

timeout.exe

pid	Process
964	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
3056	schtasks.exe

Suspicious behavior: EnumeratesProcesses 17 IoCs

Processes:

AsyncClient.exe

pid	Process
4584	AsyncClient.exe
4584	AsyncClient.exe
4584	AsyncClient.exe
4584	AsyncClient.exe
4584	AsyncClient.exe
4584	AsyncClient.exe
4584	AsyncClient.exe
4584	AsyncClient.exe
4584	AsyncClient.exe
4584	AsyncClient.exe
4584	AsyncClient.exe
4584	AsyncClient.exe
4584	AsyncClient.exe
4584	AsyncClient.exe
4584	AsyncClient.exe
4584	AsyncClient.exe
4584	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

AsyncClient.exeUpdate.exe

description	pid	Process
Token: SeDebugPrivilege	4584	AsyncClient.exe
Token: SeDebugPrivilege	2084	Update.exe
Token: SeDebugPrivilege	2084	Update.exe

Suspicious use of WriteProcessMemory 15 IoCs

Processes:

AsyncClient.execmd.execmd.exe

description	pid	Process	procid_target
PID 4584 wrote to memory of 2824	4584	AsyncClient.exe	78
PID 4584 wrote to memory of 2824	4584	AsyncClient.exe	78
PID 4584 wrote to memory of 2824	4584	AsyncClient.exe	78
PID 4584 wrote to memory of 1772	4584	AsyncClient.exe	80
PID 4584 wrote to memory of 1772	4584	AsyncClient.exe	80
PID 4584 wrote to memory of 1772	4584	AsyncClient.exe	80
PID 1772 wrote to memory of 964	1772	cmd.exe	82
PID 1772 wrote to memory of 964	1772	cmd.exe	82
PID 1772 wrote to memory of 964	1772	cmd.exe	82
PID 2824 wrote to memory of 3056	2824	cmd.exe	83
PID 2824 wrote to memory of 3056	2824	cmd.exe	83
PID 2824 wrote to memory of 3056	2824	cmd.exe	83
PID 1772 wrote to memory of 2084	1772	cmd.exe	84
PID 1772 wrote to memory of 2084	1772	cmd.exe	84
PID 1772 wrote to memory of 2084	1772	cmd.exe	84

C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe
"C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4584
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Update" /tr '"C:\Users\Admin\AppData\Local\Temp\Update.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2824
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "Update" /tr '"C:\Users\Admin\AppData\Local\Temp\Update.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:3056
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpCB8D.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1772
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:964
- - C:\Users\Admin\AppData\Local\Temp\Update.exe
    "C:\Users\Admin\AppData\Local\Temp\Update.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2084

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

System Information Discovery

1

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\Update.exe

Filesize
45KB

MD5
87b6917db381131a861ba84d4269b0bd

SHA1
801e58b238a02f2d0bb972ee230e77f4bfe4baa1

SHA256
02d242ea2f9251a46c8fc7fdc8a7c00a64491f015b3b8dbe11ff7afaff3fa7c9

SHA512
b297874e06ff77aa8115f9935a7b13fd34a472f904f960708f9c8c86881c6256834362fe8bbdee35914a132d9db4b5fc7f2fb6d418f042cbf5d8a89c5bf5fb6e

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpCB8D.tmp.bat

Filesize
153B

MD5
4f946ceede07e1fe72af75c977402e11

SHA1
1f1a163ef7a732c6b0c92ab271ead3f0004ecd19

SHA256
fae927a9998ed553ff4526487c7ab2cd2339fc2732db9ce1298c97bd827c6a7d

SHA512
4a14c4d2e4a6868167517cc26c196c20c4e9d9182014e8c3ab38c5e2c65e5745561084b4db9148f1eba1a7597b9a4ac01d66a365f6bdcedb454c888f204db7ff

Download Submit
memory/2084-20-0x0000000005E90000-0x0000000005EF8000-memory.dmp

Filesize
416KB

Download
memory/2084-18-0x0000000074800000-0x0000000074FB1000-memory.dmp

Filesize
7.7MB

Download
memory/2084-23-0x0000000005D30000-0x0000000005D94000-memory.dmp

Filesize
400KB

Download
memory/2084-22-0x00000000066E0000-0x0000000006772000-memory.dmp

Filesize
584KB

Download
memory/2084-21-0x00000000065B0000-0x00000000065CE000-memory.dmp

Filesize
120KB

Download
memory/2084-19-0x0000000006530000-0x00000000065A6000-memory.dmp

Filesize
472KB

Download
memory/2084-14-0x0000000074800000-0x0000000074FB1000-memory.dmp

Filesize
7.7MB

Download
memory/2084-17-0x0000000005F00000-0x00000000064A6000-memory.dmp

Filesize
5.6MB

Download
memory/4584-2-0x0000000074800000-0x0000000074FB1000-memory.dmp

Filesize
7.7MB

Download
memory/4584-1-0x00000000007D0000-0x00000000007E2000-memory.dmp

Filesize
72KB

Download
memory/4584-0-0x000000007480E000-0x000000007480F000-memory.dmp

Filesize
4KB

Download
memory/4584-3-0x0000000005290000-0x00000000052F6000-memory.dmp

Filesize
408KB

Download
memory/4584-10-0x0000000074800000-0x0000000074FB1000-memory.dmp

Filesize
7.7MB

Download
memory/4584-4-0x00000000056E0000-0x000000000577C000-memory.dmp

Filesize
624KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads