asyncrat | e438bbb7f03603305d8892121fc56e9d0327ca8ff34d56228cbfa198a438ede0

General

Target

AsyncClient.exe
Size

45KB
MD5

69030c7c0d7ed75f53081749da1e1c22
SHA1

98623da151fdbe7f45ad806b0c002878b8a0b7ce
SHA256

e438bbb7f03603305d8892121fc56e9d0327ca8ff34d56228cbfa198a438ede0
SHA512

09e25d55f725f06af3c450ef04b8c89051655df422ab7db0dfa6b864575bf97b0c1f396b4cd3c619cf109e7e1451a9cbda1c84abbec31cbee080f60e9969bd02
SSDEEP

768:luI1tT/w70kWUquzumo2qzEKjPGaG6PIyzjbFgX3ixDqokxD/eBDZWx:luI1tT/kW2tKTkDy3bCXSEodWx

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

83.99.11.13:6606

83.99.11.13:7707

83.99.11.13:8808

Mutex

HTKBgEz9kLr9

Attributes

delay
3
install
true
install_file
virus.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/0x0007000000012117-13.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
2828	virus.exe

Loads dropped DLL 1 IoCs

pid	Process
2508	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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	virus.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

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2980	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
2148	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2552	AsyncClient.exe
2552	AsyncClient.exe
2552	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2552	AsyncClient.exe
Token: SeDebugPrivilege	2828	virus.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 2552 wrote to memory of 2064	2552	AsyncClient.exe	30
PID 2552 wrote to memory of 2064	2552	AsyncClient.exe	30
PID 2552 wrote to memory of 2064	2552	AsyncClient.exe	30
PID 2552 wrote to memory of 2064	2552	AsyncClient.exe	30
PID 2552 wrote to memory of 2508	2552	AsyncClient.exe	32
PID 2552 wrote to memory of 2508	2552	AsyncClient.exe	32
PID 2552 wrote to memory of 2508	2552	AsyncClient.exe	32
PID 2552 wrote to memory of 2508	2552	AsyncClient.exe	32
PID 2508 wrote to memory of 2980	2508	cmd.exe	34
PID 2508 wrote to memory of 2980	2508	cmd.exe	34
PID 2508 wrote to memory of 2980	2508	cmd.exe	34
PID 2508 wrote to memory of 2980	2508	cmd.exe	34
PID 2064 wrote to memory of 2148	2064	cmd.exe	35
PID 2064 wrote to memory of 2148	2064	cmd.exe	35
PID 2064 wrote to memory of 2148	2064	cmd.exe	35
PID 2064 wrote to memory of 2148	2064	cmd.exe	35
PID 2508 wrote to memory of 2828	2508	cmd.exe	37
PID 2508 wrote to memory of 2828	2508	cmd.exe	37
PID 2508 wrote to memory of 2828	2508	cmd.exe	37
PID 2508 wrote to memory of 2828	2508	cmd.exe	37

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:2552
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "virus" /tr '"C:\Users\Admin\AppData\Roaming\virus.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2064
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "virus" /tr '"C:\Users\Admin\AppData\Roaming\virus.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2148
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpC764.tmp.bat""
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2508
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2980
- - C:\Users\Admin\AppData\Roaming\virus.exe
    "C:\Users\Admin\AppData\Roaming\virus.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2828

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\tmpC764.tmp.bat

Filesize
149B

MD5
4f327b93bb6cb36f50407c41f865f138

SHA1
9f89786c76cc36632293f8210c28fe3e1c6100a9

SHA256
31f14eb5e7ee3169b37a6cb148ae5440e84896d1c3f20836335a604fc8e2c21e

SHA512
4b287a981c2a65ef527e25fb9f597d59bf2858e87ea25b1ee4359f6db7cce0c0baca583cb959ef32f12fd723e06021949b6ee25a711468589e60a7e4db7d8d26

Download Submit
\Users\Admin\AppData\Roaming\virus.exe

Filesize
45KB

MD5
69030c7c0d7ed75f53081749da1e1c22

SHA1
98623da151fdbe7f45ad806b0c002878b8a0b7ce

SHA256
e438bbb7f03603305d8892121fc56e9d0327ca8ff34d56228cbfa198a438ede0

SHA512
09e25d55f725f06af3c450ef04b8c89051655df422ab7db0dfa6b864575bf97b0c1f396b4cd3c619cf109e7e1451a9cbda1c84abbec31cbee080f60e9969bd02

Download Submit
memory/2552-0-0x00000000745FE000-0x00000000745FF000-memory.dmp

Filesize
4KB

Download
memory/2552-1-0x0000000000A60000-0x0000000000A72000-memory.dmp

Filesize
72KB

Download
memory/2552-2-0x00000000745F0000-0x0000000074CDE000-memory.dmp

Filesize
6.9MB

Download
memory/2552-11-0x00000000745F0000-0x0000000074CDE000-memory.dmp

Filesize
6.9MB

Download
memory/2828-16-0x0000000000DE0000-0x0000000000DF2000-memory.dmp

Filesize
72KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads