asyncrat | 53b332cfe1c4c44836638f462051a11c4a1ffea657c0fb2395d56bfd1d5ed8ae

General

Target

AsyncClient.exe
Size

45KB
MD5

809b18b79b9518de77d2b7c2953fc52b
SHA1

3eecaed2b3a051b9a25366f8ac3cac8bff9fba2d
SHA256

53b332cfe1c4c44836638f462051a11c4a1ffea657c0fb2395d56bfd1d5ed8ae
SHA512

42a4a3fb24ac5ac28895693269e30f10339668061a396ffc5ce23d0f479b9c600dbf7b417f574c78862f7b2192f9e3a81efd4c98ef8d765689899b55d25c17b0
SSDEEP

768:luI1tT/w70kWUquzumo2qzEKjPGaG6PIyzjbFgX3iMZJcv88PKRzyBDZWx:luI1tT/kW2tKTkDy3bCXSMHsK5MdWx

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

VeBGOg1bXU2p

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/0x000a000000012263-13.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
2524	virus.exe

Loads dropped DLL 1 IoCs

pid	Process
2884	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	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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	virus.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2672	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
2680	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2832	AsyncClient.exe
2832	AsyncClient.exe
2832	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	2832	AsyncClient.exe
Token: SeDebugPrivilege	2524	virus.exe
Token: SeDebugPrivilege	2524	virus.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 2832 wrote to memory of 3008	2832	AsyncClient.exe	30
PID 2832 wrote to memory of 3008	2832	AsyncClient.exe	30
PID 2832 wrote to memory of 3008	2832	AsyncClient.exe	30
PID 2832 wrote to memory of 3008	2832	AsyncClient.exe	30
PID 2832 wrote to memory of 2884	2832	AsyncClient.exe	32
PID 2832 wrote to memory of 2884	2832	AsyncClient.exe	32
PID 2832 wrote to memory of 2884	2832	AsyncClient.exe	32
PID 2832 wrote to memory of 2884	2832	AsyncClient.exe	32
PID 3008 wrote to memory of 2680	3008	cmd.exe	34
PID 3008 wrote to memory of 2680	3008	cmd.exe	34
PID 3008 wrote to memory of 2680	3008	cmd.exe	34
PID 3008 wrote to memory of 2680	3008	cmd.exe	34
PID 2884 wrote to memory of 2672	2884	cmd.exe	35
PID 2884 wrote to memory of 2672	2884	cmd.exe	35
PID 2884 wrote to memory of 2672	2884	cmd.exe	35
PID 2884 wrote to memory of 2672	2884	cmd.exe	35
PID 2884 wrote to memory of 2524	2884	cmd.exe	36
PID 2884 wrote to memory of 2524	2884	cmd.exe	36
PID 2884 wrote to memory of 2524	2884	cmd.exe	36
PID 2884 wrote to memory of 2524	2884	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:2832
- 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:3008
- - 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:2680
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp72EF.tmp.bat""
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2884
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2672
- - 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:2524

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\tmp72EF.tmp.bat

Filesize
149B

MD5
18003dfb5f9fbfd827f949504b15817d

SHA1
747ef354c36ec7f80b5f1d76103faa712abeb327

SHA256
e3f9ce0ccae999fb2adfd6de37b6c06a9d7208796f3b5b6782e5aede5c57a546

SHA512
00bc487d91bbab5e39bcf60725f7ee4cbcceae914790befe5db59d97494965640d7820278d8c22c2b03285383a789d55ddf6a93085e57b60651efd79e2535c7a

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

Filesize
45KB

MD5
809b18b79b9518de77d2b7c2953fc52b

SHA1
3eecaed2b3a051b9a25366f8ac3cac8bff9fba2d

SHA256
53b332cfe1c4c44836638f462051a11c4a1ffea657c0fb2395d56bfd1d5ed8ae

SHA512
42a4a3fb24ac5ac28895693269e30f10339668061a396ffc5ce23d0f479b9c600dbf7b417f574c78862f7b2192f9e3a81efd4c98ef8d765689899b55d25c17b0

Download Submit
memory/2524-16-0x0000000001000000-0x0000000001012000-memory.dmp

Filesize
72KB

Download
memory/2832-0-0x000000007428E000-0x000000007428F000-memory.dmp

Filesize
4KB

Download
memory/2832-1-0x0000000000E90000-0x0000000000EA2000-memory.dmp

Filesize
72KB

Download
memory/2832-2-0x0000000074280000-0x000000007496E000-memory.dmp

Filesize
6.9MB

Download
memory/2832-12-0x0000000074280000-0x000000007496E000-memory.dmp

Filesize
6.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads