asyncrat | 14588fe97021a91906aa85ac0f8c7b20d21706108e69bca70a74e121684bbe5e

General

Target

AsyncClient.exe
Size

45KB
MD5

02c5a628cf4e5dfb47fd00b80a842023
SHA1

483e81aff4eb385483dd3d485eca35387599c9a3
SHA256

14588fe97021a91906aa85ac0f8c7b20d21706108e69bca70a74e121684bbe5e
SHA512

b4deb29ae7de8e67a5135d622cda8de9487532d2ed5510a85dcd31e25721867f22a1298fb5a6749ed4e1f57fe4f76a88cb7f946278ec37b32734fab326b1c369
SSDEEP

768:muBO1TXEno4WUmriSmo2qhwKjPGaG6PIyzjbFgX3iJpt32SHACMNDBDZyx:muBO1TXMo2XKTkDy3bCXSTt32SH1MNFy

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

lXualJCSo0gM

Attributes

delay
3
install
true
install_file
new rat.exe
install_folder
%AppData%

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral1/files/0x000a000000016b9b-13.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
3040	new rat.exe

Loads dropped DLL 1 IoCs

pid	Process
2960	cmd.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	new rat.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	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2904	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
2920	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2780	AsyncClient.exe
2780	AsyncClient.exe
2780	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2780	AsyncClient.exe
Token: SeDebugPrivilege	3040	new rat.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 2780 wrote to memory of 1944	2780	AsyncClient.exe	30
PID 2780 wrote to memory of 1944	2780	AsyncClient.exe	30
PID 2780 wrote to memory of 1944	2780	AsyncClient.exe	30
PID 2780 wrote to memory of 1944	2780	AsyncClient.exe	30
PID 2780 wrote to memory of 2960	2780	AsyncClient.exe	32
PID 2780 wrote to memory of 2960	2780	AsyncClient.exe	32
PID 2780 wrote to memory of 2960	2780	AsyncClient.exe	32
PID 2780 wrote to memory of 2960	2780	AsyncClient.exe	32
PID 1944 wrote to memory of 2920	1944	cmd.exe	34
PID 1944 wrote to memory of 2920	1944	cmd.exe	34
PID 1944 wrote to memory of 2920	1944	cmd.exe	34
PID 1944 wrote to memory of 2920	1944	cmd.exe	34
PID 2960 wrote to memory of 2904	2960	cmd.exe	35
PID 2960 wrote to memory of 2904	2960	cmd.exe	35
PID 2960 wrote to memory of 2904	2960	cmd.exe	35
PID 2960 wrote to memory of 2904	2960	cmd.exe	35
PID 2960 wrote to memory of 3040	2960	cmd.exe	36
PID 2960 wrote to memory of 3040	2960	cmd.exe	36
PID 2960 wrote to memory of 3040	2960	cmd.exe	36
PID 2960 wrote to memory of 3040	2960	cmd.exe	36

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:2780
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "new rat" /tr '"C:\Users\Admin\AppData\Roaming\new rat.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1944
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "new rat" /tr '"C:\Users\Admin\AppData\Roaming\new rat.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2920
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpC755.tmp.bat""
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2960
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2904
- - C:\Users\Admin\AppData\Roaming\new rat.exe
    "C:\Users\Admin\AppData\Roaming\new rat.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:3040

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\tmpC755.tmp.bat

Filesize
151B

MD5
2a268b5ceff27549f0c653af2b38b356

SHA1
d7ac708fdf8bb321af7d5dc7b1978709ea87c8b1

SHA256
02883bd2f37a9d34a3fd6eae6eea1485c0da97dfd8ba6a97213db4abb9a6da1e

SHA512
9e82a28f9e038f71d0f5927ab18a92f82fd49df5d9cc64fc3d47f549619241bddbb945fbc58f6ec001f8dc5c3461f1d6d5c56a06d426d6a32d6cb94765eec987

Download Submit
\Users\Admin\AppData\Roaming\new rat.exe

Filesize
45KB

MD5
02c5a628cf4e5dfb47fd00b80a842023

SHA1
483e81aff4eb385483dd3d485eca35387599c9a3

SHA256
14588fe97021a91906aa85ac0f8c7b20d21706108e69bca70a74e121684bbe5e

SHA512
b4deb29ae7de8e67a5135d622cda8de9487532d2ed5510a85dcd31e25721867f22a1298fb5a6749ed4e1f57fe4f76a88cb7f946278ec37b32734fab326b1c369

Download Submit
memory/2780-0-0x0000000074D1E000-0x0000000074D1F000-memory.dmp

Filesize
4KB

Download
memory/2780-1-0x0000000000310000-0x0000000000322000-memory.dmp

Filesize
72KB

Download
memory/2780-2-0x0000000074D10000-0x00000000753FE000-memory.dmp

Filesize
6.9MB

Download
memory/2780-11-0x0000000074D10000-0x00000000753FE000-memory.dmp

Filesize
6.9MB

Download
memory/3040-16-0x0000000001380000-0x0000000001392000-memory.dmp

Filesize
72KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads