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
behavioral2/files/0x0012000000011960-12.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-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	netutil.exe

Executes dropped EXE 1 IoCs

pid	Process
696	netutil.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
1940	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
1176	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
4144	netutil.exe
4144	netutil.exe
4144	netutil.exe
4144	netutil.exe
4144	netutil.exe
4144	netutil.exe
4144	netutil.exe
4144	netutil.exe
4144	netutil.exe
4144	netutil.exe
4144	netutil.exe
4144	netutil.exe
4144	netutil.exe
4144	netutil.exe
4144	netutil.exe
4144	netutil.exe
4144	netutil.exe
4144	netutil.exe
4144	netutil.exe
4144	netutil.exe
4144	netutil.exe
4144	netutil.exe
4144	netutil.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4144	netutil.exe
Token: SeDebugPrivilege	696	netutil.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4144 wrote to memory of 3068	4144	netutil.exe	83
PID 4144 wrote to memory of 3068	4144	netutil.exe	83
PID 4144 wrote to memory of 3068	4144	netutil.exe	83
PID 4144 wrote to memory of 2640	4144	netutil.exe	85
PID 4144 wrote to memory of 2640	4144	netutil.exe	85
PID 4144 wrote to memory of 2640	4144	netutil.exe	85
PID 2640 wrote to memory of 1940	2640	cmd.exe	87
PID 2640 wrote to memory of 1940	2640	cmd.exe	87
PID 2640 wrote to memory of 1940	2640	cmd.exe	87
PID 3068 wrote to memory of 1176	3068	cmd.exe	88
PID 3068 wrote to memory of 1176	3068	cmd.exe	88
PID 3068 wrote to memory of 1176	3068	cmd.exe	88
PID 2640 wrote to memory of 696	2640	cmd.exe	89
PID 2640 wrote to memory of 696	2640	cmd.exe	89
PID 2640 wrote to memory of 696	2640	cmd.exe	89

C:\Users\Admin\AppData\Local\Temp\netutil.exe
"C:\Users\Admin\AppData\Local\Temp\netutil.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4144
- 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:3068
- - 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:1176
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpAA4A.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2640
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:1940
- - 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:696

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\Microsoft\CLR_v4.0_32\UsageLogs\netutil.exe.log

Filesize
614B

MD5
54920f388010333559bdff225040761d

SHA1
040972bf1fc83014f10c45832322c094f883ce30

SHA256
9ed5449a36700939987209c7a2974b9cc669b8b22c7c4e7936f35dda0a4dc359

SHA512
e17aa5d1328b3bfd3754d15b3c2eded98653d90c7b326f941522e0b3bd6f557880246a6bc69047facb42eb97d2e0ed6c46148dfe95a98669fc4e1d07c21a285c

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpAA4A.tmp.bat

Filesize
151B

MD5
4e3256a9da9d7187dea1855cc014849d

SHA1
2263009a9588f7c08c2e079ddda52a7c47608dc2

SHA256
0f491d85bd850d07d6c3c43f69a9a16efee35508d9c4dd825acd4876989f9a52

SHA512
b0746c07b182308c33a5bbd78e2edf2236643d045380ac7d5f9bb93a52478e008362db7a2e9cafaecf5e687956b3e37e9c7c8860e2a5d049d032a29ced5fa70e

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

Filesize
45KB

MD5
823308911bdc70ead70f3dfa4ef78fbb

SHA1
ef9d6123d41288daaffb36389c03f290a08bc33f

SHA256
e2fa9ec2b619fcb4e4d40d95ad57ce2d8ba94efc20defba98f19196be75d2a53

SHA512
4643ea8fbdfde92e5e8fd00e8d5fb718b4a43e8d902cfb36197d3aa5d50d3b769241ed08bb4961ad148cc9e867ba85d97010cda5c9737f1d989c30da4d22aa9f

Download Submit
memory/696-15-0x0000000075170000-0x0000000075920000-memory.dmp

Filesize
7.7MB

Download
memory/696-16-0x0000000075170000-0x0000000075920000-memory.dmp

Filesize
7.7MB

Download
memory/4144-0-0x000000007522E000-0x000000007522F000-memory.dmp

Filesize
4KB

Download
memory/4144-1-0x0000000000F40000-0x0000000000F52000-memory.dmp

Filesize
72KB

Download
memory/4144-2-0x0000000075220000-0x00000000759D0000-memory.dmp

Filesize
7.7MB

Download
memory/4144-3-0x00000000058D0000-0x0000000005936000-memory.dmp

Filesize
408KB

Download
memory/4144-4-0x0000000005D90000-0x0000000005E2C000-memory.dmp

Filesize
624KB

Download
memory/4144-9-0x0000000075220000-0x00000000759D0000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads