asyncrat | c671d25e21e83929c1853e697f29b0e8ed3b69edc6add61d4d8b8bc2018afe14

Analysis

max time kernel
90s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20230220-en
resource tags

arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
submitted
22-03-2023 13:58

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General

Target

390Z21.ps1
Size

206KB
MD5

7f42335561e2adb6a744f1dcb02b1505
SHA1

415e34780b8e144c28995e611117d7d0182f3b22
SHA256

c671d25e21e83929c1853e697f29b0e8ed3b69edc6add61d4d8b8bc2018afe14
SHA512

442c90c2f926480beb001ed1ae45bf4f9893988d135367bf51c1a8ab7f27e4a11cbec1a9fea5f6897c1dc15cbc33fa7e0f027199c281107e7c5536a63aa2058c
SSDEEP

3072:RO2MjmUvLcSRr0zELowmGcAK3ApfJo74Pda:RpMjbYYowmGcAK3Apxm1

Score

10^/10

asyncrat default rat

Malware Config

Extracted

Family

asyncrat

Version

| Edit 3LOSH RAT

Botnet

Default

185.81.157.244:6601

Mutex

AsyncMutex_6S181I8OkPnk

Attributes

delay
3
install
false
install_folder
%AppData%

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat

Async RAT payload 1 IoCs

rat

Processes:

resource	yara_rule
behavioral2/memory/1936-188-0x0000000000400000-0x0000000000414000-memory.dmp	asyncrat

Checks computer location settings 2 TTPs 3 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

Processes:

WScript.exeWScript.exemshta.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-144354903-2550862337-1367551827-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-144354903-2550862337-1367551827-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-144354903-2550862337-1367551827-1000\Control Panel\International\Geo\Nation	mshta.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

powershell.exe

description pid process target process

PID 1236 set thread context of 1936 1236 powershell.exe RegSvcs.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

description	pid	process	target process
PID 1236 set thread context of 1936	1236	powershell.exe	RegSvcs.exe

Modifies registry class 2 IoCs

Processes:

powershell.exepowershell.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-144354903-2550862337-1367551827-1000_Classes\Local Settings	powershell.exe
Key created	\REGISTRY\USER\S-1-5-21-144354903-2550862337-1367551827-1000_Classes\Local Settings	powershell.exe

Suspicious behavior: EnumeratesProcesses 10 IoCs

Processes:

powershell.exepowershell.exepowershell.exeRegSvcs.exe

pid	process
1484	powershell.exe
1484	powershell.exe
4984	powershell.exe
4984	powershell.exe
1236	powershell.exe
1236	powershell.exe
1236	powershell.exe
1236	powershell.exe
1236	powershell.exe
1936	RegSvcs.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

Processes:

powershell.exepowershell.exepowershell.exeRegSvcs.exe

description	pid	process
Token: SeDebugPrivilege	1484	powershell.exe
Token: SeDebugPrivilege	4984	powershell.exe
Token: SeDebugPrivilege	1236	powershell.exe
Token: SeDebugPrivilege	1936	RegSvcs.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

RegSvcs.exe

pid process

1936 RegSvcs.exe

pid	process
1936	RegSvcs.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

powershell.exeWScript.exepowershell.exeWScript.execmd.exemshta.exepowershell.exe

description	pid	process	target process
PID 1484 wrote to memory of 1996	1484	powershell.exe	WScript.exe
PID 1484 wrote to memory of 1996	1484	powershell.exe	WScript.exe
PID 1996 wrote to memory of 4984	1996	WScript.exe	powershell.exe
PID 1996 wrote to memory of 4984	1996	WScript.exe	powershell.exe
PID 4984 wrote to memory of 2400	4984	powershell.exe	WScript.exe
PID 4984 wrote to memory of 2400	4984	powershell.exe	WScript.exe
PID 2400 wrote to memory of 3572	2400	WScript.exe	cmd.exe
PID 2400 wrote to memory of 3572	2400	WScript.exe	cmd.exe
PID 3572 wrote to memory of 2164	3572	cmd.exe	mshta.exe
PID 3572 wrote to memory of 2164	3572	cmd.exe	mshta.exe
PID 2164 wrote to memory of 1236	2164	mshta.exe	powershell.exe
PID 2164 wrote to memory of 1236	2164	mshta.exe	powershell.exe
PID 1236 wrote to memory of 1684	1236	powershell.exe	RegSvcs.exe
PID 1236 wrote to memory of 1684	1236	powershell.exe	RegSvcs.exe
PID 1236 wrote to memory of 1684	1236	powershell.exe	RegSvcs.exe
PID 1236 wrote to memory of 1936	1236	powershell.exe	RegSvcs.exe
PID 1236 wrote to memory of 1936	1236	powershell.exe	RegSvcs.exe
PID 1236 wrote to memory of 1936	1236	powershell.exe	RegSvcs.exe
PID 1236 wrote to memory of 1936	1236	powershell.exe	RegSvcs.exe
PID 1236 wrote to memory of 1936	1236	powershell.exe	RegSvcs.exe
PID 1236 wrote to memory of 1936	1236	powershell.exe	RegSvcs.exe
PID 1236 wrote to memory of 1936	1236	powershell.exe	RegSvcs.exe
PID 1236 wrote to memory of 1936	1236	powershell.exe	RegSvcs.exe

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
powershell.exe -ExecutionPolicy bypass -File C:\Users\Admin\AppData\Local\Temp\390Z21.ps1
1⤵
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1484

C:\Windows\System32\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\ProgramData\Document\BT.vbs"
2⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1996

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -NonInteractive -WindowStyle Hidden -ExecutionPolicy RemoteSigned -Command &{$BLNLS='ReadAllText';$T='C:\ProgramData\Document\BT.ps1';IEx([<#1#>IO.File<#1#>]::$BLNLS($T))}
3⤵
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4984

C:\Windows\System32\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\ProgramData\schtasks\Document.vbs"
4⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2400

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c ""C:\ProgramData\Document\Loader.bat" "
5⤵
- Suspicious use of WriteProcessMemory
PID:3572

C:\Windows\system32\mshta.exe
mshta vbscript:Execute("CreateObject(""WScript.Shell"").Run ""powe"+""+""+""+""+""+""+""+""+""+""+""+""+""+""+""+""+""+""+""+""+""+""+""+""+""+""+""+""+""+""+""+""+""+""+""+""+""+""+"rshell -Execu"+"tionP"+"olicy"+" Bypass & 'C:\ProgramData\Document\Document.ps1'"", 0:close")
6⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2164

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass & 'C:\ProgramData\Document\Document.ps1'
7⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1236

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe"
8⤵
PID:1684

C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe"
8⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
PID:1936

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\ProgramData\Document\BT.ps1
Filesize
822B

MD5
a185048be8e4dcc4af37a21033364350

SHA1
6203dd67cf4e9958d52fe7fb8dd34e2364416046

SHA256
3311eb6e7226e8e21c3ae7b3f29c9859d0be7b10736cb3883d5c453f59a41583

SHA512
75b51d7cadfcd656d92431848809f62e3c902f20ddd36665eec41d92d622b62f4830b04094052df9c7fb8b827b0dad8d4589dbacb1e5c4bee65bbbc794c7d32c

Download Submit
C:\ProgramData\Document\BT.vbs
Filesize
482B

MD5
d81d9785f8a33a52adbf7761bb81483c

SHA1
c7f97c27e4ad633369c9eca1be36335356486727

SHA256
cd30619863fb29e056c285521902eda2d820052f5cbc7a5d92ad331eab6460c4

SHA512
0c08b68c6b64a57ba4494e20b5c840f3f013aa2873d03aa1d2a017c707614479afe024cfd1cdde17851d0f36cfc34a895eea1e41d4a4118067ec366c19bf41cf

Download Submit
C:\ProgramData\Document\Document.ps1
Filesize
202KB

MD5
6e7968ef23d12120b090badbb5ab6c68

SHA1
a15cf14da3192a7e64fbd0e9ea90ad2c2ab03f18

SHA256
05593d5c9e42cc15217ca2db5c27a955aa2cedae87c9471b2181aad36ca8edaa

SHA512
8d120fd8859ff68103a35fb342c799045cda3f92a039b844cfab18fd75f7a831afca2b95e68aadf864207b46eb40d8b96d5ba7fb44c2a1cf7d2c947fdcad929c

Download Submit
C:\ProgramData\Document\Loader.bat
Filesize
276B

MD5
aaff07ba1501352dabd41d75b0e8bb4f

SHA1
d55ed9a18b657313801b7da2e2e5d79b1c0ae033

SHA256
b74497ce30b1a5e218bdad0bec6bd9ab24f38ab6881fa52c9f651f418bf6dc7a

SHA512
5afe35b094429427fd0c8e7194baa497d43c64a4d4a195e5789a145ab0ddc608a29e941f66d9dee2ded3e0253d501676c4632076bf6e5897383fc240a4d0f333

Download Submit
C:\ProgramData\schtasks\Document.vbs
Filesize
652B

MD5
3fdf59c6cc932ccfb273ee77a5338509

SHA1
dc0bfd3323aff0fdabd00f98496f30cb1a2aee5f

SHA256
d8ded725a6dec74218c880a7c80c20755efecb0a8e3d82d5fae5963652c215e4

SHA512
e049dc02cc84139cd775fc1bfb901574b8fb2aff393a8da696f2602c8adda17bb0dfb62c19a31d8b15ade2179b5e54c41deacb3b01d785d1cb621dc0a0a0aa80

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log
Filesize
3KB

MD5
223bd4ae02766ddc32e6145fd1a29301

SHA1
900cfd6526d7e33fb4039a1cc2790ea049bc2c5b

SHA256
1022ec2fed08ff473817fc53893e192a8e33e6a16f3d2c8cb6fd37f49c938e1e

SHA512
648cd3f8a89a18128d2b1bf960835e087a74cdbc783dbfcc712b3cb9e3a2e4f715e534ba2ef81d89af8f60d4882f6859373248c875ceb26ad0922e891f2e74cc

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Filesize
1KB

MD5
27fdb1beb89b56345e585d480be3026b

SHA1
2626e41ca27668518d01c04e1579f77027ff31a1

SHA256
ef8cd66cc241c6d899919ae6f8369334b20202bd4ad49acfa546d29300c533d2

SHA512
bd8208c8763ad8a6c25b6363b8e0e2a3c694e4e0cabfe4ce5d40945bd1f4274b7da976997f825e95c4455bf6b2e20b5bd960609b172f7c70d3521cb2ab24d49a

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Filesize
1KB

MD5
70595b5937369a2592a524db67e208d3

SHA1
d989b934d9388104189f365694e794835aa6f52f

SHA256
be09b93a020e2e86a0b3c7c3f3d3e2c45f888944b1036df738385ede16f595c8

SHA512
edb412886187a2740eb7e284b16838bdd9f011aba1f4581f1fed25a86cdfe9b2ab4df863edeb3db6b072805439d57b10f3e0a1f2daabe1ee56db275ad2ad61e5

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_olm0lpyo.syo.ps1
Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/1236-186-0x000001C046290000-0x000001C0462A0000-memory.dmp

Filesize
64KB

Download
memory/1236-187-0x000001C046290000-0x000001C0462A0000-memory.dmp

Filesize
64KB

Download
memory/1484-138-0x000001B9A2040000-0x000001B9A2062000-memory.dmp

Filesize
136KB

Download
memory/1484-145-0x000001B985920000-0x000001B985930000-memory.dmp

Filesize
64KB

Download
memory/1484-144-0x000001B985920000-0x000001B985930000-memory.dmp

Filesize
64KB

Download
memory/1484-143-0x000001B985920000-0x000001B985930000-memory.dmp

Filesize
64KB

Download
memory/1936-192-0x0000000005CB0000-0x0000000005D42000-memory.dmp

Filesize
584KB

Download
memory/1936-188-0x0000000000400000-0x0000000000414000-memory.dmp

Filesize
80KB

Download
memory/1936-190-0x00000000056E0000-0x00000000056F0000-memory.dmp

Filesize
64KB

Download
memory/1936-191-0x0000000006070000-0x0000000006614000-memory.dmp

Filesize
5.6MB

Download
memory/1936-193-0x0000000005CA0000-0x0000000005CAA000-memory.dmp

Filesize
40KB

Download
memory/1936-196-0x0000000006D40000-0x0000000006DDC000-memory.dmp

Filesize
624KB

Download
memory/1936-197-0x0000000006DE0000-0x0000000006E46000-memory.dmp

Filesize
408KB

Download
memory/1936-198-0x00000000056E0000-0x00000000056F0000-memory.dmp

Filesize
64KB

Download
memory/4984-170-0x000001CE04C20000-0x000001CE04C30000-memory.dmp

Filesize
64KB

Download
memory/4984-162-0x000001CE04C20000-0x000001CE04C30000-memory.dmp

Filesize
64KB

Download
memory/4984-156-0x000001CE04C20000-0x000001CE04C30000-memory.dmp

Filesize
64KB

Download