asyncrat | c61af51a2fd8fc0e50206237844a14b5d5fbab5fb9963ac579d292e864f7799d

General

Target

AsyncClient.exe
Size

47KB
MD5

84ce795a60f779cc933bf3cc6e794fa2
SHA1

a67cbd9ab868d1b07cc882c6235f0f2e4dad0bb9
SHA256

c61af51a2fd8fc0e50206237844a14b5d5fbab5fb9963ac579d292e864f7799d
SHA512

3651fe88baf783f25ae5fad59e24c340895f6db8d0c57497d07cd46681ee7fc94364e436764245c3fad6f4f90414ac21efb66b37ebac0d58a4db31edc2b33bfa
SSDEEP

768:4uk0VT3ongoWU2Gjimo2qrHNxsdukHAlPI+SxRpugo0b7t65XB5QeF/aI9BDZ7x:4uk0VT3Q+2yyN+SxREGb7QnFnd7x

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

127.0.0.1:7707

127.0.0.1:8808

Mutex

rAex1GkFWgUj

Attributes

delay
3
install
true
install_file
hey.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
behavioral2/files/0x000500000001e74d-12.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-1-5-21-2718105630-359604950-2820636825-1000\Control Panel\International\Geo\Nation	AsyncClient.exe

Executes dropped EXE 1 IoCs

pid	Process
2928	hey.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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	hey.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AsyncClient.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
4760	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
1136	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
3744	AsyncClient.exe
3744	AsyncClient.exe
3744	AsyncClient.exe
3744	AsyncClient.exe
3744	AsyncClient.exe
3744	AsyncClient.exe
3744	AsyncClient.exe
3744	AsyncClient.exe
3744	AsyncClient.exe
3744	AsyncClient.exe
3744	AsyncClient.exe
3744	AsyncClient.exe
3744	AsyncClient.exe
3744	AsyncClient.exe
3744	AsyncClient.exe
3744	AsyncClient.exe
3744	AsyncClient.exe
3744	AsyncClient.exe
3744	AsyncClient.exe
3744	AsyncClient.exe
3744	AsyncClient.exe
3744	AsyncClient.exe
3744	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	3744	AsyncClient.exe
Token: SeDebugPrivilege	2928	hey.exe
Token: SeDebugPrivilege	2928	hey.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 3744 wrote to memory of 4088	3744	AsyncClient.exe	89
PID 3744 wrote to memory of 4088	3744	AsyncClient.exe	89
PID 3744 wrote to memory of 4088	3744	AsyncClient.exe	89
PID 3744 wrote to memory of 1988	3744	AsyncClient.exe	91
PID 3744 wrote to memory of 1988	3744	AsyncClient.exe	91
PID 3744 wrote to memory of 1988	3744	AsyncClient.exe	91
PID 4088 wrote to memory of 1136	4088	cmd.exe	93
PID 4088 wrote to memory of 1136	4088	cmd.exe	93
PID 4088 wrote to memory of 1136	4088	cmd.exe	93
PID 1988 wrote to memory of 4760	1988	cmd.exe	94
PID 1988 wrote to memory of 4760	1988	cmd.exe	94
PID 1988 wrote to memory of 4760	1988	cmd.exe	94
PID 1988 wrote to memory of 2928	1988	cmd.exe	95
PID 1988 wrote to memory of 2928	1988	cmd.exe	95
PID 1988 wrote to memory of 2928	1988	cmd.exe	95

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:3744
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "hey" /tr '"C:\Users\Admin\AppData\Roaming\hey.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4088
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "hey" /tr '"C:\Users\Admin\AppData\Roaming\hey.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:1136
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpC3DC.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1988
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:4760
- - C:\Users\Admin\AppData\Roaming\hey.exe
    "C:\Users\Admin\AppData\Roaming\hey.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2928

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\tmpC3DC.tmp.bat

Filesize
147B

MD5
feae835b14eaa3f160bdb26fa638e8a5

SHA1
9989c8f107c70978aba58ae8e09ce2ab187efd08

SHA256
de182ee2bdd0af5ee0d6c8060ab3275f323494ae6c77d0b3e21df232ac52a602

SHA512
196ff055f3d24c386415ddc41e3d8d1852a908607f1e0bb7b592bf77daeb8c8b207913c1fb6c2c5ae30e3fc2c2cc4e1d92529d258ec9a743a204bc2a89f77079

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

Filesize
47KB

MD5
84ce795a60f779cc933bf3cc6e794fa2

SHA1
a67cbd9ab868d1b07cc882c6235f0f2e4dad0bb9

SHA256
c61af51a2fd8fc0e50206237844a14b5d5fbab5fb9963ac579d292e864f7799d

SHA512
3651fe88baf783f25ae5fad59e24c340895f6db8d0c57497d07cd46681ee7fc94364e436764245c3fad6f4f90414ac21efb66b37ebac0d58a4db31edc2b33bfa

Download Submit
memory/2928-14-0x00000000743C0000-0x0000000074B70000-memory.dmp

Filesize
7.7MB

Download
memory/2928-15-0x00000000743C0000-0x0000000074B70000-memory.dmp

Filesize
7.7MB

Download
memory/3744-0-0x000000007447E000-0x000000007447F000-memory.dmp

Filesize
4KB

Download
memory/3744-1-0x00000000000E0000-0x00000000000F2000-memory.dmp

Filesize
72KB

Download
memory/3744-2-0x0000000074470000-0x0000000074C20000-memory.dmp

Filesize
7.7MB

Download
memory/3744-3-0x0000000004A60000-0x0000000004AC6000-memory.dmp

Filesize
408KB

Download
memory/3744-4-0x0000000004F20000-0x0000000004FBC000-memory.dmp

Filesize
624KB

Download
memory/3744-9-0x0000000074470000-0x0000000074C20000-memory.dmp

Filesize
7.7MB

Download

Resubmissions

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads