asyncrat | 39e9de563fb308499965ea8c138875b302565d8747c0efb68b9a357f33d6670b

General

Target

random.exe
Size

1004KB
MD5

178eb9748fb977de3771a9f0d2741589
SHA1

99d4836af933b69020448615a60db85cc848b803
SHA256

39e9de563fb308499965ea8c138875b302565d8747c0efb68b9a357f33d6670b
SHA512

0824751fb0e51c892824eb84b378bd703091a2482c1a5f01a51bda7f6f81f6c266ac5a1f9521d4b14f8fa90f17041911f32543180a45c72dcb51ba7f21b42fe5
SSDEEP

24576:m/dsDhtehTlBGYU8GY5A3lPZ6IPyMnUHM+htzKZy9:2sDqRsYsY5A1PwIPyx/htMy9

Score

10^/10

asyncrat venomrat default discovery execution rat

Malware Config

Extracted

Family

asyncrat

Version

Esco Private rat

Botnet

Default

C2

162.250.127.123:4449

Mutex

mypbddbvimolnn

Attributes

delay
1
install
false
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

VenomRAT 1 IoCs

Detects VenomRAT.

rat

resource	yara_rule
behavioral2/memory/2076-1-0x00000000009F0000-0x0000000000A6A000-memory.dmp	VenomRAT

Venomrat family
venomrat

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-1-5-21-3350944739-639801879-157714471-1000\Control Panel\International\Geo\Nation	random.exe

Executes dropped EXE 1 IoCs

pid	Process
3840	lum.exe

Checks installed software on the system 1 TTPs
Looks up Uninstall key entries in the registry to enumerate software on the system.
discovery

Query Registry
T1012

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Start PowerShell.

execution

PowerShell

T1059.001

pid	Process
1092	powershell.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 1 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	lum.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
2076	random.exe
2076	random.exe
2076	random.exe
1092	powershell.exe
1092	powershell.exe
2076	random.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2076	random.exe
Token: SeDebugPrivilege	1092	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2076	random.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 2076 wrote to memory of 456	2076	random.exe	84
PID 2076 wrote to memory of 456	2076	random.exe	84
PID 456 wrote to memory of 1092	456	cmd.exe	86
PID 456 wrote to memory of 1092	456	cmd.exe	86
PID 1092 wrote to memory of 3840	1092	powershell.exe	87
PID 1092 wrote to memory of 3840	1092	powershell.exe	87
PID 1092 wrote to memory of 3840	1092	powershell.exe	87

C:\Users\Admin\AppData\Local\Temp\random.exe
"C:\Users\Admin\AppData\Local\Temp\random.exe"
1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2076
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c start /b powershell –ExecutionPolicy Bypass Start-Process -FilePath '"C:\Users\Admin\AppData\Local\Temp\lum.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:456
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    powershell –ExecutionPolicy Bypass Start-Process -FilePath '"C:\Users\Admin\AppData\Local\Temp\lum.exe"'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:1092
  - - C:\Users\Admin\AppData\Local\Temp\lum.exe
      "C:\Users\Admin\AppData\Local\Temp\lum.exe"
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      PID:3840

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

2

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

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_opk1b5x2.qeu.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\lum.exe

Filesize
1.1MB

MD5
70f53df21466418837be1fafe08d1aec

SHA1
deb56c4657ae60171467c1983f44d8739fe48fa1

SHA256
22cd999faa7c86b9e47dae779fc9ce2373803951f16a05b1ed201bde94d84b73

SHA512
cd9c9f341ec86c8d99b6dfe89fc3d16dc6e2419ea0243a04ca6aa77ba2dbbb391bc61a02c2b7ddbd018e3676780ddcb9a3a3963aba0d62d41631c8f2ada467cd

Download Submit
memory/1092-17-0x00007FFA81940000-0x00007FFA82401000-memory.dmp

Filesize
10.8MB

Download
memory/1092-35-0x00007FFA81940000-0x00007FFA82401000-memory.dmp

Filesize
10.8MB

Download
memory/1092-29-0x00007FFA81940000-0x00007FFA82401000-memory.dmp

Filesize
10.8MB

Download
memory/1092-28-0x00007FFA81940000-0x00007FFA82401000-memory.dmp

Filesize
10.8MB

Download
memory/1092-27-0x000001E4FC4F0000-0x000001E4FC512000-memory.dmp

Filesize
136KB

Download
memory/2076-9-0x00007FFA81940000-0x00007FFA82401000-memory.dmp

Filesize
10.8MB

Download
memory/2076-0-0x00007FFA81943000-0x00007FFA81945000-memory.dmp

Filesize
8KB

Download
memory/2076-13-0x000000001B5E0000-0x000000001B5EE000-memory.dmp

Filesize
56KB

Download
memory/2076-14-0x000000001BAB0000-0x000000001BACE000-memory.dmp

Filesize
120KB

Download
memory/2076-16-0x00007FFA81940000-0x00007FFA82401000-memory.dmp

Filesize
10.8MB

Download
memory/2076-11-0x00007FFA81940000-0x00007FFA82401000-memory.dmp

Filesize
10.8MB

Download
memory/2076-10-0x00007FFA81943000-0x00007FFA81945000-memory.dmp

Filesize
8KB

Download
memory/2076-12-0x000000001CB30000-0x000000001CBA6000-memory.dmp

Filesize
472KB

Download
memory/2076-7-0x00007FFA81940000-0x00007FFA82401000-memory.dmp

Filesize
10.8MB

Download
memory/2076-4-0x00007FFA81940000-0x00007FFA82401000-memory.dmp

Filesize
10.8MB

Download
memory/2076-30-0x00007FFA81940000-0x00007FFA82401000-memory.dmp

Filesize
10.8MB

Download
memory/2076-3-0x00007FFA81940000-0x00007FFA82401000-memory.dmp

Filesize
10.8MB

Download
memory/2076-1-0x00000000009F0000-0x0000000000A6A000-memory.dmp

Filesize
488KB

Download
memory/2076-36-0x00007FFA81940000-0x00007FFA82401000-memory.dmp

Filesize
10.8MB

Download
memory/3840-37-0x0000000000D90000-0x0000000000DF2000-memory.dmp

Filesize
392KB

Download

Analysis

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