asyncrat | 513105f291a41960b5e08f5e94dee377eae8f6b483e012cc835869b639e1fc5b

Analysis

max time kernel
132s
max time network
149s
platform
windows11-21h2_x64
resource
win11-20241007-en
resource tags

arch:x64arch:x86image:win11-20241007-enlocale:en-usos:windows11-21h2-x64system
submitted
12/12/2024, 16:38 UTC

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General

Target

AsyncClient.exe
Size

47KB
MD5

990d7fc3e6573a3622f530c3975a0d59
SHA1

eb90ae84dd1416b431a352ce70c3146c7c7a311a
SHA256

513105f291a41960b5e08f5e94dee377eae8f6b483e012cc835869b639e1fc5b
SHA512

e92b36f8ea66ac7bcf07e7d45b0288f160513ddc40a0e414167748276cfcdee92b0eef0be1c580b4bde7a6c7e7547d93ba525d77e9b620698f033c8b8e695e49
SSDEEP

768:cu4X9TskvpDWUPlNxmo2qbx4IV1Xz5PI6smtd0bngny0ZUVYhyDnRPJRcfBDZEx:cu4X9Tswb2+NK6smt6bngyiUqkpJ6dEx

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

127.0.0.1:6606

127.0.0.1:7707

127.0.0.1:8808

192.168.100.96:6606

192.168.100.96:7707

192.168.100.96:8808

Mutex

EwG9PLMu7fcT

Attributes

delay
3
install
true
install_file
Debugger.exe
install_folder
%AppData%

aes.plain

1
P4Mdp27sqRfw7lETZ7KJOlmWWS49isph

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/0x001b00000002aa8b-12.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
2800	Debugger.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	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	Debugger.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
5052	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
2228	schtasks.exe

Suspicious behavior: EnumeratesProcesses 17 IoCs

pid	Process
3368	AsyncClient.exe
3368	AsyncClient.exe
3368	AsyncClient.exe
3368	AsyncClient.exe
3368	AsyncClient.exe
3368	AsyncClient.exe
3368	AsyncClient.exe
3368	AsyncClient.exe
3368	AsyncClient.exe
3368	AsyncClient.exe
3368	AsyncClient.exe
3368	AsyncClient.exe
3368	AsyncClient.exe
3368	AsyncClient.exe
3368	AsyncClient.exe
3368	AsyncClient.exe
3368	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	3368	AsyncClient.exe
Token: SeDebugPrivilege	2800	Debugger.exe
Token: SeDebugPrivilege	2800	Debugger.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 3368 wrote to memory of 4368	3368	AsyncClient.exe	78
PID 3368 wrote to memory of 4368	3368	AsyncClient.exe	78
PID 3368 wrote to memory of 4368	3368	AsyncClient.exe	78
PID 3368 wrote to memory of 3572	3368	AsyncClient.exe	80
PID 3368 wrote to memory of 3572	3368	AsyncClient.exe	80
PID 3368 wrote to memory of 3572	3368	AsyncClient.exe	80
PID 4368 wrote to memory of 2228	4368	cmd.exe	82
PID 4368 wrote to memory of 2228	4368	cmd.exe	82
PID 4368 wrote to memory of 2228	4368	cmd.exe	82
PID 3572 wrote to memory of 5052	3572	cmd.exe	83
PID 3572 wrote to memory of 5052	3572	cmd.exe	83
PID 3572 wrote to memory of 5052	3572	cmd.exe	83
PID 3572 wrote to memory of 2800	3572	cmd.exe	84
PID 3572 wrote to memory of 2800	3572	cmd.exe	84
PID 3572 wrote to memory of 2800	3572	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:3368
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Debugger" /tr '"C:\Users\Admin\AppData\Roaming\Debugger.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4368
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "Debugger" /tr '"C:\Users\Admin\AppData\Roaming\Debugger.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2228
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp8B67.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3572
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:5052
- - C:\Users\Admin\AppData\Roaming\Debugger.exe
    "C:\Users\Admin\AppData\Roaming\Debugger.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2800

Network

DNS

8.8.8.8.in-addr.arpa

Remote address:

8.8.8.8:53

Request

8.8.8.8.in-addr.arpa

IN PTR

Response

8.8.8.8.in-addr.arpa

IN PTR

dnsgoogle
DNS

nexusrules.officeapps.live.com

Remote address:

8.8.8.8:53

Request

nexusrules.officeapps.live.com

IN A

Response

nexusrules.officeapps.live.com

IN CNAME

prod.nexusrules.live.com.akadns.net

prod.nexusrules.live.com.akadns.net

IN A

52.111.229.43
DNS

43.229.111.52.in-addr.arpa

Remote address:

8.8.8.8:53

Request

43.229.111.52.in-addr.arpa

IN PTR

Response

127.0.0.1:7707

Debugger.exe
127.0.0.1:7707

Debugger.exe
192.168.100.96:8808

Debugger.exe

260 B
5
192.168.100.96:8808

Debugger.exe

260 B
5
127.0.0.1:7707

Debugger.exe
127.0.0.1:6606

Debugger.exe
127.0.0.1:6606

Debugger.exe
127.0.0.1:7707

Debugger.exe
192.168.100.96:8808

Debugger.exe

260 B
5
192.168.100.96:7707

Debugger.exe

260 B
5

8.8.8.8:53

8.8.8.8.in-addr.arpa

dns

214 B
389 B
3
3

DNS Request

8.8.8.8.in-addr.arpa

DNS Request

nexusrules.officeapps.live.com

DNS Response

52.111.229.43

DNS Request

43.229.111.52.in-addr.arpa

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmp8B67.tmp.bat

Filesize
152B

MD5
7f9c2c2b34f6211ac72d94dde63d9b4f

SHA1
c98e5581c045367d15777ad9b4159971c4358a71

SHA256
28dc820cb5204c4a92155fb5af60c619105598b079496f75c6e4c36c7060d0a2

SHA512
133cefab59c078a624b3d59755ee0ca3af9a7f886e241940141784fb7b5e7930491a8128a1c4b10ed1b183f8638648ae19c78bfa9a819faa0841b2753d1d5485

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

Filesize
47KB

MD5
990d7fc3e6573a3622f530c3975a0d59

SHA1
eb90ae84dd1416b431a352ce70c3146c7c7a311a

SHA256
513105f291a41960b5e08f5e94dee377eae8f6b483e012cc835869b639e1fc5b

SHA512
e92b36f8ea66ac7bcf07e7d45b0288f160513ddc40a0e414167748276cfcdee92b0eef0be1c580b4bde7a6c7e7547d93ba525d77e9b620698f033c8b8e695e49

Download Submit
memory/2800-14-0x0000000074690000-0x0000000074E41000-memory.dmp

Filesize
7.7MB

Download
memory/2800-15-0x0000000074690000-0x0000000074E41000-memory.dmp

Filesize
7.7MB

Download
memory/3368-0-0x000000007474E000-0x000000007474F000-memory.dmp

Filesize
4KB

Download
memory/3368-1-0x0000000000F80000-0x0000000000F92000-memory.dmp

Filesize
72KB

Download
memory/3368-2-0x0000000074740000-0x0000000074EF1000-memory.dmp

Filesize
7.7MB

Download
memory/3368-3-0x00000000059D0000-0x0000000005A36000-memory.dmp

Filesize
408KB

Download
memory/3368-4-0x0000000005E90000-0x0000000005F2C000-memory.dmp

Filesize
624KB

Download
memory/3368-9-0x0000000074740000-0x0000000074EF1000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

DNS Request

DNS Request

DNS Response

DNS Request

MITRE ATT&CK Enterprise v15

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