asyncrat | 9650473b3a6d1d9478797e85cd7ad79c071425d2a71014a874caedef435d1980

General

Target

iio.exe
Size

47KB
MD5

737848c12a722379d585dc4c05c0c382
SHA1

235ecf4b2a37303201eb08e4e5c8f4a5831b5e58
SHA256

9650473b3a6d1d9478797e85cd7ad79c071425d2a71014a874caedef435d1980
SHA512

680c28e49985f13593d402f6b7fcce56928dac2a5644342042f293c3603abe82905d53267b9b46a6f7a009fcbd2cf1d3e68abb498fa4f75c39ec0b8b90fd47fd
SSDEEP

768:KanemsORjPrinbfh7uKqaoRpPLmmN3TeWkuvCbH0bme4RJE5L4cDZ9f+:KanemsOR7xaApxhkuvaUbme4zArd9f+

Score

10^/10

asyncrat syr discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

SYR

C2

147.185.221.24:6606

147.185.221.24:7707

147.185.221.24:8808

147.185.221.24:33931

Mutex

Tg31N8yl8KBD

Attributes

delay
3
install
true
install_file
Win32.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/0x0007000000023c94-11.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-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation	iio.exe

Executes dropped EXE 1 IoCs

pid	Process
1356	Win32.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	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Win32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	iio.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
1068	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
1752	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
4520	iio.exe
4520	iio.exe
4520	iio.exe
4520	iio.exe
4520	iio.exe
4520	iio.exe
4520	iio.exe
4520	iio.exe
4520	iio.exe
4520	iio.exe
4520	iio.exe
4520	iio.exe
4520	iio.exe
4520	iio.exe
4520	iio.exe
4520	iio.exe
4520	iio.exe
4520	iio.exe
4520	iio.exe
4520	iio.exe
4520	iio.exe
4520	iio.exe
4520	iio.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4520	iio.exe
Token: SeDebugPrivilege	1356	Win32.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4520 wrote to memory of 3680	4520	iio.exe	85
PID 4520 wrote to memory of 3680	4520	iio.exe	85
PID 4520 wrote to memory of 3680	4520	iio.exe	85
PID 4520 wrote to memory of 3868	4520	iio.exe	87
PID 4520 wrote to memory of 3868	4520	iio.exe	87
PID 4520 wrote to memory of 3868	4520	iio.exe	87
PID 3868 wrote to memory of 1068	3868	cmd.exe	89
PID 3868 wrote to memory of 1068	3868	cmd.exe	89
PID 3868 wrote to memory of 1068	3868	cmd.exe	89
PID 3680 wrote to memory of 1752	3680	cmd.exe	90
PID 3680 wrote to memory of 1752	3680	cmd.exe	90
PID 3680 wrote to memory of 1752	3680	cmd.exe	90
PID 3868 wrote to memory of 1356	3868	cmd.exe	91
PID 3868 wrote to memory of 1356	3868	cmd.exe	91
PID 3868 wrote to memory of 1356	3868	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\iio.exe
"C:\Users\Admin\AppData\Local\Temp\iio.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4520
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Win32" /tr '"C:\Users\Admin\AppData\Roaming\Win32.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3680
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "Win32" /tr '"C:\Users\Admin\AppData\Roaming\Win32.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:1752
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpA95F.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3868
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:1068
- - C:\Users\Admin\AppData\Roaming\Win32.exe
    "C:\Users\Admin\AppData\Roaming\Win32.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:1356

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

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Temp\tmpA95F.tmp.bat

Filesize
149B

MD5
4b39e2dcb21ce42ceaa977d779aa0835

SHA1
db06dc026423d8a81409b65dc732377c419214a9

SHA256
82294ba8cbcfedd0c207ebae45e9b9160ef0e3cba0a51f4c43cbc2d9396ec6c6

SHA512
8cbe6cc9d173d6ab60fed7b464aab4a66fb42b42eb040f0a7a7ece88f850cbb2b1c16218e153ebeaa0be731e0900832c685a341e2553caf39fb192f83c7b17bc

Download Submit
C:\Users\Admin\AppData\Roaming\Win32.exe

Filesize
47KB

MD5
737848c12a722379d585dc4c05c0c382

SHA1
235ecf4b2a37303201eb08e4e5c8f4a5831b5e58

SHA256
9650473b3a6d1d9478797e85cd7ad79c071425d2a71014a874caedef435d1980

SHA512
680c28e49985f13593d402f6b7fcce56928dac2a5644342042f293c3603abe82905d53267b9b46a6f7a009fcbd2cf1d3e68abb498fa4f75c39ec0b8b90fd47fd

Download Submit
memory/1356-13-0x00000000751E0000-0x0000000075990000-memory.dmp

Filesize
7.7MB

Download
memory/1356-14-0x00000000751E0000-0x0000000075990000-memory.dmp

Filesize
7.7MB

Download
memory/4520-0-0x00000000751EE000-0x00000000751EF000-memory.dmp

Filesize
4KB

Download
memory/4520-1-0x0000000000890000-0x00000000008A2000-memory.dmp

Filesize
72KB

Download
memory/4520-2-0x00000000751E0000-0x0000000075990000-memory.dmp

Filesize
7.7MB

Download
memory/4520-3-0x00000000052A0000-0x000000000533C000-memory.dmp

Filesize
624KB

Download
memory/4520-8-0x00000000751E0000-0x0000000075990000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads