asyncrat | db1e6b77da2691daf1be1eed70dc625e5e4749cfdd1833f194fedc63340b41d9

General

Target

S-2.exe
Size

254KB
MD5

4270337062dd7bc8bf4ccbe505a15256
SHA1

8b48ddb8b17e21b3b9085ea3eda17055fc7cd222
SHA256

db1e6b77da2691daf1be1eed70dc625e5e4749cfdd1833f194fedc63340b41d9
SHA512

06d72a838e88eeb8fc6807e7127c2b2a92cdae3476dc523671b140c23b1b0708033acb0f9ddb5b15632b240fb8e33fa4dfef5f8634e033d5c42b955828fa1e5c

Score

10^/10

asyncrat persistence rat

Malware Config

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers.
rat asyncrat
Executes dropped EXE 1 IoCs

Processes:

RegAsm.exe

pid process

1056 RegAsm.exe
Loads dropped DLL 2 IoCs

Processes:

S-2.exeRegAsm.exe

pid process

1820 S-2.exe
1056 RegAsm.exe

pid	process
1056	RegAsm.exe

pid	process
1820	S-2.exe
1056	RegAsm.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

S-2.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Windows\CurrentVersion\Run\LsaIso = "\"C:\\Users\\Admin\\AppData\\Roaming\\LsaIso\\LsaIso.exe\""	S-2.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

S-2.exe

description pid process target process

PID 1820 set thread context of 1056 1820 S-2.exe RegAsm.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Suspicious behavior: EnumeratesProcesses 5 IoCs

Processes:

S-2.exepowershell.exe

pid process

1820 S-2.exe
1820 S-2.exe
1820 S-2.exe
300 powershell.exe
300 powershell.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

S-2.exepowershell.exe

description pid process

Token: SeDebugPrivilege 1820 S-2.exe
Token: SeDebugPrivilege 300 powershell.exe

description	pid	process	target process
PID 1820 set thread context of 1056	1820	S-2.exe	RegAsm.exe

pid	process
1820	S-2.exe
1820	S-2.exe
1820	S-2.exe
300	powershell.exe
300	powershell.exe

description	pid	process
Token: SeDebugPrivilege	1820	S-2.exe
Token: SeDebugPrivilege	300	powershell.exe

Suspicious use of WriteProcessMemory 20 IoCs

Processes:

S-2.exeWScript.exe

description	pid	process	target process
PID 1820 wrote to memory of 568	1820	S-2.exe	WScript.exe
PID 1820 wrote to memory of 568	1820	S-2.exe	WScript.exe
PID 1820 wrote to memory of 568	1820	S-2.exe	WScript.exe
PID 1820 wrote to memory of 568	1820	S-2.exe	WScript.exe
PID 1820 wrote to memory of 1056	1820	S-2.exe	RegAsm.exe
PID 1820 wrote to memory of 1056	1820	S-2.exe	RegAsm.exe
PID 1820 wrote to memory of 1056	1820	S-2.exe	RegAsm.exe
PID 1820 wrote to memory of 1056	1820	S-2.exe	RegAsm.exe
PID 1820 wrote to memory of 1056	1820	S-2.exe	RegAsm.exe
PID 1820 wrote to memory of 1056	1820	S-2.exe	RegAsm.exe
PID 1820 wrote to memory of 1056	1820	S-2.exe	RegAsm.exe
PID 1820 wrote to memory of 1056	1820	S-2.exe	RegAsm.exe
PID 1820 wrote to memory of 1056	1820	S-2.exe	RegAsm.exe
PID 1820 wrote to memory of 1056	1820	S-2.exe	RegAsm.exe
PID 1820 wrote to memory of 1056	1820	S-2.exe	RegAsm.exe
PID 1820 wrote to memory of 1056	1820	S-2.exe	RegAsm.exe
PID 568 wrote to memory of 300	568	WScript.exe	powershell.exe
PID 568 wrote to memory of 300	568	WScript.exe	powershell.exe
PID 568 wrote to memory of 300	568	WScript.exe	powershell.exe
PID 568 wrote to memory of 300	568	WScript.exe	powershell.exe

C:\Users\Admin\AppData\Local\Temp\S-2.exe
"C:\Users\Admin\AppData\Local\Temp\S-2.exe"
1⤵
- Loads dropped DLL
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1820
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\_Qalskboooco.vbs"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:568
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath C:\,'C:\Users\Admin\AppData\Roaming\LsaIso\LsaIso.exe'
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:300
- C:\Users\Admin\AppData\Local\Temp\RegAsm.exe
  C:\Users\Admin\AppData\Local\Temp\RegAsm.exe
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  PID:1056

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\RegAsm.exe

MD5
b58b926c3574d28d5b7fdd2ca3ec30d5

SHA1
d260c4ffd603a9cfc057fcb83d678b1cecdf86f9

SHA256
6e70b56d748c4ccab13cc8a055d3795ea0dd95fe3b70568d7d3ac0c6621140a3

SHA512
b13cb998822b716b695013bcd6dec62a2290567d0d1743b2d982ca084235cf69c6ea1fc91c9d4e62657c6f9e102c7c60e81296ab055ffe43b887c5f8ec8958ab

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

MD5
b58b926c3574d28d5b7fdd2ca3ec30d5

SHA1
d260c4ffd603a9cfc057fcb83d678b1cecdf86f9

SHA256
6e70b56d748c4ccab13cc8a055d3795ea0dd95fe3b70568d7d3ac0c6621140a3

SHA512
b13cb998822b716b695013bcd6dec62a2290567d0d1743b2d982ca084235cf69c6ea1fc91c9d4e62657c6f9e102c7c60e81296ab055ffe43b887c5f8ec8958ab

Download Submit
C:\Users\Admin\AppData\Local\Temp\_Qalskboooco.vbs

MD5
fcf13028b585b1d18e7a353aed758212

SHA1
9314e21cc3b8bf637ef4ec7f89def61d588939e2

SHA256
a32bf2a295e6d36f081e977fe5daa27d763a335beb93bcce5203cf042cc846aa

SHA512
c826a9af051098c231dde830904355c4e2a7ad4196a79a1a27c67b6a90000240bb91c1a848136c82602e174ba8b2031f9e119ed1e15897ae00cc0d06ae92c457

Download Submit
\Users\Admin\AppData\Local\Temp\RegAsm.exe

MD5
b58b926c3574d28d5b7fdd2ca3ec30d5

SHA1
d260c4ffd603a9cfc057fcb83d678b1cecdf86f9

SHA256
6e70b56d748c4ccab13cc8a055d3795ea0dd95fe3b70568d7d3ac0c6621140a3

SHA512
b13cb998822b716b695013bcd6dec62a2290567d0d1743b2d982ca084235cf69c6ea1fc91c9d4e62657c6f9e102c7c60e81296ab055ffe43b887c5f8ec8958ab

Download Submit
\Users\Admin\AppData\Local\Temp\RegAsm.exe

MD5
b58b926c3574d28d5b7fdd2ca3ec30d5

SHA1
d260c4ffd603a9cfc057fcb83d678b1cecdf86f9

SHA256
6e70b56d748c4ccab13cc8a055d3795ea0dd95fe3b70568d7d3ac0c6621140a3

SHA512
b13cb998822b716b695013bcd6dec62a2290567d0d1743b2d982ca084235cf69c6ea1fc91c9d4e62657c6f9e102c7c60e81296ab055ffe43b887c5f8ec8958ab

Download Submit
memory/300-92-0x00000000056B0000-0x00000000056B1000-memory.dmp

Filesize
4KB

Download
memory/300-98-0x0000000006210000-0x0000000006211000-memory.dmp

Filesize
4KB

Download
memory/300-122-0x0000000006310000-0x0000000006311000-memory.dmp

Filesize
4KB

Download
memory/300-121-0x0000000006300000-0x0000000006301000-memory.dmp

Filesize
4KB

Download
memory/300-107-0x0000000005620000-0x0000000005621000-memory.dmp

Filesize
4KB

Download
memory/300-106-0x00000000061B0000-0x00000000061B1000-memory.dmp

Filesize
4KB

Download
memory/300-99-0x000000007EF30000-0x000000007EF31000-memory.dmp

Filesize
4KB

Download
memory/300-89-0x0000000005240000-0x0000000005241000-memory.dmp

Filesize
4KB

Download
memory/300-97-0x00000000056F0000-0x00000000056F1000-memory.dmp

Filesize
4KB

Download
memory/300-81-0x0000000000000000-mapping.dmp

Download
memory/300-83-0x0000000001E50000-0x0000000001E51000-memory.dmp

Filesize
4KB

Download
memory/300-84-0x0000000004760000-0x0000000004761000-memory.dmp

Filesize
4KB

Download
memory/300-85-0x0000000002120000-0x0000000002D6A000-memory.dmp

Filesize
12.3MB

Download
memory/300-87-0x0000000002650000-0x0000000002651000-memory.dmp

Filesize
4KB

Download
memory/568-76-0x0000000076641000-0x0000000076643000-memory.dmp

Filesize
8KB

Download
memory/568-69-0x0000000000000000-mapping.dmp

Download
memory/1056-88-0x0000000002300000-0x0000000002301000-memory.dmp

Filesize
4KB

Download
memory/1056-79-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1056-72-0x0000000000400000-0x0000000000426000-memory.dmp

Filesize
152KB

Download
memory/1056-73-0x0000000000421D5E-mapping.dmp

Download
memory/1820-60-0x00000000012A0000-0x00000000012A1000-memory.dmp

Filesize
4KB

Download
memory/1820-62-0x0000000000300000-0x0000000000302000-memory.dmp

Filesize
8KB

Download
memory/1820-67-0x0000000004760000-0x0000000004761000-memory.dmp

Filesize
4KB

Download
memory/1820-68-0x0000000000590000-0x00000000005A6000-memory.dmp

Filesize
88KB

Download

Analysis

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