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Analysis

  • max time kernel
    58s
  • max time network
    47s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    06/10/2024, 19:46

General

  • Target

    bc5291ee0d10c3c162be7663068790322127c781d1ed8789a847c140dd0075ad.exe

  • Size

    436KB

  • MD5

    347bc8ce26d1a2f12714c11f3dacdd86

  • SHA1

    b9bf9b6161ab9a59f733c6b258a5e0977ea96f72

  • SHA256

    bc5291ee0d10c3c162be7663068790322127c781d1ed8789a847c140dd0075ad

  • SHA512

    76b9ed3e398f64948643e127a8f8f9c654777995ff90cbcc58ab69c7134cf53c6c63861cd79aa5ed3eea077a1f0de6a9877708e8461cd243a3334432dcf53254

  • SSDEEP

    12288:CtmEp/dzYtn6c1Ts8ovJlgC2PNBxqe8Ke3:QdzYd6c1TAvfgxxt8N

Malware Config

Extracted

Family

remcos

Botnet

Yavakosa

C2

198.23.227.212:32583

Attributes
  • audio_folder

    MicRecords

  • audio_record_time

    5

  • connect_delay

    0

  • connect_interval

    1

  • copy_file

    yava_vd.exe

  • copy_folder

    yava

  • delete_file

    false

  • hide_file

    false

  • hide_keylog_file

    false

  • install_flag

    true

  • install_path

    %AppData%

  • keylog_crypt

    false

  • keylog_file

    logs.dat

  • keylog_flag

    false

  • keylog_folder

    remcos

  • mouse_option

    false

  • mutex

    Rmc-D7NPY6

  • 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.

  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Executes dropped EXE 1 IoCs
  • Adds Run key to start application 2 TTPs 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Program crash 23 IoCs
  • System Location Discovery: System Language Discovery 1 TTPs 2 IoCs

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

  • Suspicious use of WriteProcessMemory 3 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\bc5291ee0d10c3c162be7663068790322127c781d1ed8789a847c140dd0075ad.exe
    "C:\Users\Admin\AppData\Local\Temp\bc5291ee0d10c3c162be7663068790322127c781d1ed8789a847c140dd0075ad.exe"
    1⤵
    • Checks computer location settings
    • Adds Run key to start application
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3744
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3744 -s 1012
      2⤵
      • Program crash
      PID:2360
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3744 -s 1048
      2⤵
      • Program crash
      PID:956
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3744 -s 1160
      2⤵
      • Program crash
      PID:1464
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3744 -s 1036
      2⤵
      • Program crash
      PID:3304
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3744 -s 1188
      2⤵
      • Program crash
      PID:1860
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3744 -s 1180
      2⤵
      • Program crash
      PID:1460
    • C:\Users\Admin\AppData\Roaming\yava\yava_vd.exe
      "C:\Users\Admin\AppData\Roaming\yava\yava_vd.exe"
      2⤵
      • Executes dropped EXE
      • Adds Run key to start application
      • System Location Discovery: System Language Discovery
      PID:1064
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 1064 -s 668
        3⤵
        • Program crash
        PID:4564
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 1064 -s 672
        3⤵
        • Program crash
        PID:636
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 1064 -s 748
        3⤵
        • Program crash
        PID:5032
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 1064 -s 784
        3⤵
        • Program crash
        PID:4972
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 1064 -s 796
        3⤵
        • Program crash
        PID:3508
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 1064 -s 948
        3⤵
        • Program crash
        PID:2956
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 1064 -s 988
        3⤵
        • Program crash
        PID:4480
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 1064 -s 1008
        3⤵
        • Program crash
        PID:2256
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 1064 -s 980
        3⤵
        • Program crash
        PID:3272
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 1064 -s 1016
        3⤵
        • Program crash
        PID:1256
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 1064 -s 1264
        3⤵
        • Program crash
        PID:2856
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 1064 -s 684
        3⤵
        • Program crash
        PID:3172
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 1064 -s 884
        3⤵
        • Program crash
        PID:4192
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 1064 -s 1304
        3⤵
        • Program crash
        PID:4668
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 1064 -s 1372
        3⤵
        • Program crash
        PID:4048
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 1064 -s 1320
        3⤵
        • Program crash
        PID:1096
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3744 -s 996
      2⤵
      • Program crash
      PID:4964
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 3744 -ip 3744
    1⤵
      PID:1916
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 184 -p 3744 -ip 3744
      1⤵
        PID:1832
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 412 -p 3744 -ip 3744
        1⤵
          PID:4852
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 3744 -ip 3744
          1⤵
            PID:2448
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -pss -s 412 -p 3744 -ip 3744
            1⤵
              PID:3236
            • C:\Windows\SysWOW64\WerFault.exe
              C:\Windows\SysWOW64\WerFault.exe -pss -s 472 -p 3744 -ip 3744
              1⤵
                PID:2716
              • C:\Windows\SysWOW64\WerFault.exe
                C:\Windows\SysWOW64\WerFault.exe -pss -s 184 -p 3744 -ip 3744
                1⤵
                  PID:2968
                • C:\Windows\SysWOW64\WerFault.exe
                  C:\Windows\SysWOW64\WerFault.exe -pss -s 508 -p 1064 -ip 1064
                  1⤵
                    PID:2896
                  • C:\Windows\SysWOW64\WerFault.exe
                    C:\Windows\SysWOW64\WerFault.exe -pss -s 472 -p 1064 -ip 1064
                    1⤵
                      PID:1232
                    • C:\Windows\SysWOW64\WerFault.exe
                      C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 1064 -ip 1064
                      1⤵
                        PID:2736
                      • C:\Windows\SysWOW64\WerFault.exe
                        C:\Windows\SysWOW64\WerFault.exe -pss -s 516 -p 1064 -ip 1064
                        1⤵
                          PID:1708
                        • C:\Windows\SysWOW64\WerFault.exe
                          C:\Windows\SysWOW64\WerFault.exe -pss -s 524 -p 1064 -ip 1064
                          1⤵
                            PID:4832
                          • C:\Windows\SysWOW64\WerFault.exe
                            C:\Windows\SysWOW64\WerFault.exe -pss -s 508 -p 1064 -ip 1064
                            1⤵
                              PID:3688
                            • C:\Windows\SysWOW64\WerFault.exe
                              C:\Windows\SysWOW64\WerFault.exe -pss -s 184 -p 1064 -ip 1064
                              1⤵
                                PID:2728
                              • C:\Windows\SysWOW64\WerFault.exe
                                C:\Windows\SysWOW64\WerFault.exe -pss -s 520 -p 1064 -ip 1064
                                1⤵
                                  PID:3608
                                • C:\Windows\SysWOW64\WerFault.exe
                                  C:\Windows\SysWOW64\WerFault.exe -pss -s 540 -p 1064 -ip 1064
                                  1⤵
                                    PID:4688
                                  • C:\Windows\SysWOW64\WerFault.exe
                                    C:\Windows\SysWOW64\WerFault.exe -pss -s 412 -p 1064 -ip 1064
                                    1⤵
                                      PID:3060
                                    • C:\Windows\SysWOW64\WerFault.exe
                                      C:\Windows\SysWOW64\WerFault.exe -pss -s 512 -p 1064 -ip 1064
                                      1⤵
                                        PID:1876
                                      • C:\Windows\SysWOW64\WerFault.exe
                                        C:\Windows\SysWOW64\WerFault.exe -pss -s 564 -p 1064 -ip 1064
                                        1⤵
                                          PID:2564
                                        • C:\Windows\SysWOW64\WerFault.exe
                                          C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 1064 -ip 1064
                                          1⤵
                                            PID:412
                                          • C:\Windows\SysWOW64\WerFault.exe
                                            C:\Windows\SysWOW64\WerFault.exe -pss -s 512 -p 1064 -ip 1064
                                            1⤵
                                              PID:4576
                                            • C:\Windows\SysWOW64\WerFault.exe
                                              C:\Windows\SysWOW64\WerFault.exe -pss -s 528 -p 1064 -ip 1064
                                              1⤵
                                                PID:3816
                                              • C:\Windows\SysWOW64\WerFault.exe
                                                C:\Windows\SysWOW64\WerFault.exe -pss -s 508 -p 1064 -ip 1064
                                                1⤵
                                                  PID:3076

                                                Network

                                                MITRE ATT&CK Enterprise v15

                                                Replay Monitor

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                                                Downloads

                                                • C:\Users\Admin\AppData\Roaming\yava\yava_vd.exe

                                                  Filesize

                                                  436KB

                                                  MD5

                                                  347bc8ce26d1a2f12714c11f3dacdd86

                                                  SHA1

                                                  b9bf9b6161ab9a59f733c6b258a5e0977ea96f72

                                                  SHA256

                                                  bc5291ee0d10c3c162be7663068790322127c781d1ed8789a847c140dd0075ad

                                                  SHA512

                                                  76b9ed3e398f64948643e127a8f8f9c654777995ff90cbcc58ab69c7134cf53c6c63861cd79aa5ed3eea077a1f0de6a9877708e8461cd243a3334432dcf53254

                                                • memory/1064-22-0x0000000000400000-0x0000000000568000-memory.dmp

                                                  Filesize

                                                  1.4MB

                                                • memory/1064-21-0x0000000000400000-0x0000000000568000-memory.dmp

                                                  Filesize

                                                  1.4MB

                                                • memory/1064-26-0x0000000000400000-0x0000000000568000-memory.dmp

                                                  Filesize

                                                  1.4MB

                                                • memory/1064-25-0x0000000000400000-0x0000000000568000-memory.dmp

                                                  Filesize

                                                  1.4MB

                                                • memory/1064-24-0x0000000000400000-0x0000000000568000-memory.dmp

                                                  Filesize

                                                  1.4MB

                                                • memory/1064-23-0x0000000000400000-0x0000000000568000-memory.dmp

                                                  Filesize

                                                  1.4MB

                                                • memory/1064-16-0x0000000000400000-0x0000000000568000-memory.dmp

                                                  Filesize

                                                  1.4MB

                                                • memory/1064-20-0x0000000000400000-0x0000000000568000-memory.dmp

                                                  Filesize

                                                  1.4MB

                                                • memory/1064-18-0x0000000000400000-0x0000000000568000-memory.dmp

                                                  Filesize

                                                  1.4MB

                                                • memory/1064-17-0x0000000000400000-0x0000000000568000-memory.dmp

                                                  Filesize

                                                  1.4MB

                                                • memory/3744-3-0x0000000000400000-0x0000000000482000-memory.dmp

                                                  Filesize

                                                  520KB

                                                • memory/3744-1-0x0000000000600000-0x0000000000700000-memory.dmp

                                                  Filesize

                                                  1024KB

                                                • memory/3744-12-0x0000000000400000-0x0000000000568000-memory.dmp

                                                  Filesize

                                                  1.4MB

                                                • memory/3744-13-0x00000000022B0000-0x000000000232A000-memory.dmp

                                                  Filesize

                                                  488KB

                                                • memory/3744-14-0x0000000000400000-0x0000000000482000-memory.dmp

                                                  Filesize

                                                  520KB

                                                • memory/3744-2-0x00000000022B0000-0x000000000232A000-memory.dmp

                                                  Filesize

                                                  488KB