asyncrat | e2fa9ec2b619fcb4e4d40d95ad57ce2d8ba94efc20defba98f19196be75d2a53

General

Target

netutil.exe
Size

45KB
MD5

823308911bdc70ead70f3dfa4ef78fbb
SHA1

ef9d6123d41288daaffb36389c03f290a08bc33f
SHA256

e2fa9ec2b619fcb4e4d40d95ad57ce2d8ba94efc20defba98f19196be75d2a53
SHA512

4643ea8fbdfde92e5e8fd00e8d5fb718b4a43e8d902cfb36197d3aa5d50d3b769241ed08bb4961ad148cc9e867ba85d97010cda5c9737f1d989c30da4d22aa9f
SSDEEP

768:zuwpFTAY3IQWUe9jqmo2qLN9oSsqHz1OPIqzjbBg83ioGFEkcO5S6IBDZLl:zuwpFTA4/2iKti3q3bu8S7NcO5edLl

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

192.168.1.87:16804

Mutex

uyVUAyFT67eL

Attributes

delay
3
install
true
install_file
netutil.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/0x00080000000194e6-13.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
3052	netutil.exe

Loads dropped DLL 1 IoCs

pid	Process
2920	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	netutil.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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	netutil.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2792	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
2220	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
1792	netutil.exe
1792	netutil.exe
1792	netutil.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1792	netutil.exe
Token: SeDebugPrivilege	3052	netutil.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 1792 wrote to memory of 484	1792	netutil.exe	32
PID 1792 wrote to memory of 484	1792	netutil.exe	32
PID 1792 wrote to memory of 484	1792	netutil.exe	32
PID 1792 wrote to memory of 484	1792	netutil.exe	32
PID 1792 wrote to memory of 2920	1792	netutil.exe	34
PID 1792 wrote to memory of 2920	1792	netutil.exe	34
PID 1792 wrote to memory of 2920	1792	netutil.exe	34
PID 1792 wrote to memory of 2920	1792	netutil.exe	34
PID 2920 wrote to memory of 2792	2920	cmd.exe	36
PID 2920 wrote to memory of 2792	2920	cmd.exe	36
PID 2920 wrote to memory of 2792	2920	cmd.exe	36
PID 2920 wrote to memory of 2792	2920	cmd.exe	36
PID 484 wrote to memory of 2220	484	cmd.exe	37
PID 484 wrote to memory of 2220	484	cmd.exe	37
PID 484 wrote to memory of 2220	484	cmd.exe	37
PID 484 wrote to memory of 2220	484	cmd.exe	37
PID 2920 wrote to memory of 3052	2920	cmd.exe	38
PID 2920 wrote to memory of 3052	2920	cmd.exe	38
PID 2920 wrote to memory of 3052	2920	cmd.exe	38
PID 2920 wrote to memory of 3052	2920	cmd.exe	38

C:\Users\Admin\AppData\Local\Temp\netutil.exe
"C:\Users\Admin\AppData\Local\Temp\netutil.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1792
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "netutil" /tr '"C:\Users\Admin\AppData\Roaming\netutil.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:484
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "netutil" /tr '"C:\Users\Admin\AppData\Roaming\netutil.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2220
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpD671.tmp.bat""
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2920
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2792
- - C:\Users\Admin\AppData\Roaming\netutil.exe
    "C:\Users\Admin\AppData\Roaming\netutil.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:3052

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\tmpD671.tmp.bat

Filesize
151B

MD5
c9e2e2d622d039658bd54174c486599d

SHA1
60809283d359c07399bfeea0c7dc34e8904fb463

SHA256
8b5f4835e3b1e940650200592a72d8873e2cbb2de3175031df6f6113b3a38765

SHA512
80e05c0e99cfb2b1bdb630f4d469901b8a6e7585943aac1345303b5e5a5bcd4843360a79dd8f18acb0865cdb0d9d056e59d4ba2a736b8907452763411a0d50be

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

Filesize
45KB

MD5
823308911bdc70ead70f3dfa4ef78fbb

SHA1
ef9d6123d41288daaffb36389c03f290a08bc33f

SHA256
e2fa9ec2b619fcb4e4d40d95ad57ce2d8ba94efc20defba98f19196be75d2a53

SHA512
4643ea8fbdfde92e5e8fd00e8d5fb718b4a43e8d902cfb36197d3aa5d50d3b769241ed08bb4961ad148cc9e867ba85d97010cda5c9737f1d989c30da4d22aa9f

Download Submit
memory/1792-0-0x000000007469E000-0x000000007469F000-memory.dmp

Filesize
4KB

Download
memory/1792-1-0x0000000000C70000-0x0000000000C82000-memory.dmp

Filesize
72KB

Download
memory/1792-2-0x0000000074690000-0x0000000074D7E000-memory.dmp

Filesize
6.9MB

Download
memory/1792-11-0x0000000074690000-0x0000000074D7E000-memory.dmp

Filesize
6.9MB

Download
memory/3052-16-0x0000000000060000-0x0000000000072000-memory.dmp

Filesize
72KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads