Analysis

  • max time kernel
    149s
  • max time network
    146s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    06-03-2023 15:38

General

  • Target

    Curriculum Vitae M.K. Rashitha Udayanga.pdf.exe

  • Size

    929KB

  • MD5

    1eee890ebe5e8b5d03a2fae63f791141

  • SHA1

    75b0c7cb4069b21b70794d25bd89a3d5bcac8205

  • SHA256

    ad3a4db849a64ea07922d63153d3381798b4450f28d8db82c95393a5f6aaa569

  • SHA512

    c806dc7c1b857c6823369fb104173243faf350a6f34af92d749b93fd6aad0061d3aa1c24d2e3951341d4c8c17b1c79507d39d0d447940352ead727454aac79ab

  • SSDEEP

    24576:eTsIBMNjnNNOhAe/S0uEpWBmlWDXBpYe0ZqaWcioykjEziYQp7dX:3glWDR/0UciRA

Malware Config

Extracted

Family

remcos

Botnet

XP

C2

xpremcuz300622.ddns.net:3542

Attributes
  • audio_folder

    MicRecords

  • audio_record_time

    5

  • connect_delay

    0

  • connect_interval

    1

  • copy_file

    oos.exe

  • delete_file

    false

  • hide_file

    true

  • 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

    Remcos-MMP2I7

  • screenshot_crypt

    false

  • screenshot_flag

    false

  • screenshot_folder

    Screenshots

  • screenshot_path

    %AppData%

  • screenshot_time

    10

  • startup_value

    kkl

  • take_screenshot_option

    false

  • take_screenshot_time

    5

Signatures

  • Remcos

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

  • NirSoft MailPassView 2 IoCs

    Password recovery tool for various email clients

  • Nirsoft 4 IoCs
  • Checks computer location settings 2 TTPs 2 IoCs

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

  • Executes dropped EXE 5 IoCs
  • Reads user/profile data of web browsers 2 TTPs

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

  • Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs
  • Adds Run key to start application 2 TTPs 8 IoCs
  • Suspicious use of SetThreadContext 4 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Modifies registry class 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 52 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Curriculum Vitae M.K. Rashitha Udayanga.pdf.exe
    "C:\Users\Admin\AppData\Local\Temp\Curriculum Vitae M.K. Rashitha Udayanga.pdf.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:2600
    • C:\Users\Admin\AppData\Local\Temp\Curriculum Vitae M.K. Rashitha Udayanga.pdf.exe
      "{path}"
      2⤵
      • Checks computer location settings
      • Adds Run key to start application
      • Modifies registry class
      • Suspicious use of WriteProcessMemory
      PID:4672
      • C:\Windows\SysWOW64\WScript.exe
        "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
        3⤵
        • Checks computer location settings
        • Suspicious use of WriteProcessMemory
        PID:5056
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\oos.exe"
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:1908
          • C:\Users\Admin\AppData\Roaming\oos.exe
            C:\Users\Admin\AppData\Roaming\oos.exe
            5⤵
            • Executes dropped EXE
            • Suspicious use of SetThreadContext
            • Suspicious use of WriteProcessMemory
            PID:2348
            • C:\Users\Admin\AppData\Roaming\oos.exe
              "{path}"
              6⤵
              • Executes dropped EXE
              • Adds Run key to start application
              • Suspicious use of SetThreadContext
              • Suspicious use of SetWindowsHookEx
              • Suspicious use of WriteProcessMemory
              PID:3312
              • C:\Users\Admin\AppData\Roaming\oos.exe
                C:\Users\Admin\AppData\Roaming\oos.exe /stext "C:\Users\Admin\AppData\Local\Temp\rlraougxifugirhvjqxllu"
                7⤵
                • Executes dropped EXE
                PID:3220
              • C:\Users\Admin\AppData\Roaming\oos.exe
                C:\Users\Admin\AppData\Roaming\oos.exe /stext "C:\Users\Admin\AppData\Local\Temp\bgwtpmrrwnmtkxdzabknwhfep"
                7⤵
                • Executes dropped EXE
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                PID:4788
              • C:\Users\Admin\AppData\Roaming\oos.exe
                C:\Users\Admin\AppData\Roaming\oos.exe /stext "C:\Users\Admin\AppData\Local\Temp\mibmpectsveyvlrdkmeozmavxxby"
                7⤵
                • Executes dropped EXE
                • Accesses Microsoft Outlook accounts
                PID:4268

Network

MITRE ATT&CK Matrix ATT&CK v6

Persistence

Registry Run Keys / Startup Folder

1
T1060

Defense Evasion

Modify Registry

1
T1112

Credential Access

Credentials in Files

1
T1081

Discovery

Query Registry

1
T1012

System Information Discovery

2
T1082

Collection

Data from Local System

1
T1005

Email Collection

1
T1114

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\ProgramData\remcos\logs.dat
    Filesize

    144B

    MD5

    f736b3a0f6ca9680171124bb83322b2a

    SHA1

    f985c5fb8088d1304e2d7f8597ff4757c747fb9f

    SHA256

    eeec61acc7e2c4ea552d92c2a1fe535b16d4694c20d1ec818441ac2d7110a9ee

    SHA512

    3a43f53990a76dfdaef9deef5a67bb83ded6606a6173b1971d8b2b8dc4c10f1cf149ebce9a0808049a6d462cd950a52301d68b92482778daccca24be3caf522e

  • C:\Users\Admin\AppData\Local\Temp\install.vbs
    Filesize

    398B

    MD5

    a5d3440f90cbfae712166e20870eaed7

    SHA1

    cc1e1a2945eb2ad475234344f7527ad9e9873647

    SHA256

    960a570da95b8d16809cbcc18e8ca4d81e16cb666354ddc1d572daf93f291f02

    SHA512

    d3136a280fbb326ccc5cb5ab1214aed8ccd6baa7f3f89ef9e0b5bf391a957dab2c121640bb056e6cbda0594f83133c4dbb4e1e2f0e290b44a401cd2cf8cfd4aa

  • C:\Users\Admin\AppData\Roaming\oos.exe
    Filesize

    929KB

    MD5

    1eee890ebe5e8b5d03a2fae63f791141

    SHA1

    75b0c7cb4069b21b70794d25bd89a3d5bcac8205

    SHA256

    ad3a4db849a64ea07922d63153d3381798b4450f28d8db82c95393a5f6aaa569

    SHA512

    c806dc7c1b857c6823369fb104173243faf350a6f34af92d749b93fd6aad0061d3aa1c24d2e3951341d4c8c17b1c79507d39d0d447940352ead727454aac79ab

  • C:\Users\Admin\AppData\Roaming\oos.exe
    Filesize

    929KB

    MD5

    1eee890ebe5e8b5d03a2fae63f791141

    SHA1

    75b0c7cb4069b21b70794d25bd89a3d5bcac8205

    SHA256

    ad3a4db849a64ea07922d63153d3381798b4450f28d8db82c95393a5f6aaa569

    SHA512

    c806dc7c1b857c6823369fb104173243faf350a6f34af92d749b93fd6aad0061d3aa1c24d2e3951341d4c8c17b1c79507d39d0d447940352ead727454aac79ab

  • C:\Users\Admin\AppData\Roaming\oos.exe
    Filesize

    929KB

    MD5

    1eee890ebe5e8b5d03a2fae63f791141

    SHA1

    75b0c7cb4069b21b70794d25bd89a3d5bcac8205

    SHA256

    ad3a4db849a64ea07922d63153d3381798b4450f28d8db82c95393a5f6aaa569

    SHA512

    c806dc7c1b857c6823369fb104173243faf350a6f34af92d749b93fd6aad0061d3aa1c24d2e3951341d4c8c17b1c79507d39d0d447940352ead727454aac79ab

  • C:\Users\Admin\AppData\Roaming\oos.exe
    Filesize

    929KB

    MD5

    1eee890ebe5e8b5d03a2fae63f791141

    SHA1

    75b0c7cb4069b21b70794d25bd89a3d5bcac8205

    SHA256

    ad3a4db849a64ea07922d63153d3381798b4450f28d8db82c95393a5f6aaa569

    SHA512

    c806dc7c1b857c6823369fb104173243faf350a6f34af92d749b93fd6aad0061d3aa1c24d2e3951341d4c8c17b1c79507d39d0d447940352ead727454aac79ab

  • C:\Users\Admin\AppData\Roaming\oos.exe
    Filesize

    929KB

    MD5

    1eee890ebe5e8b5d03a2fae63f791141

    SHA1

    75b0c7cb4069b21b70794d25bd89a3d5bcac8205

    SHA256

    ad3a4db849a64ea07922d63153d3381798b4450f28d8db82c95393a5f6aaa569

    SHA512

    c806dc7c1b857c6823369fb104173243faf350a6f34af92d749b93fd6aad0061d3aa1c24d2e3951341d4c8c17b1c79507d39d0d447940352ead727454aac79ab

  • C:\Users\Admin\AppData\Roaming\oos.exe
    Filesize

    929KB

    MD5

    1eee890ebe5e8b5d03a2fae63f791141

    SHA1

    75b0c7cb4069b21b70794d25bd89a3d5bcac8205

    SHA256

    ad3a4db849a64ea07922d63153d3381798b4450f28d8db82c95393a5f6aaa569

    SHA512

    c806dc7c1b857c6823369fb104173243faf350a6f34af92d749b93fd6aad0061d3aa1c24d2e3951341d4c8c17b1c79507d39d0d447940352ead727454aac79ab

  • memory/2348-155-0x0000000005820000-0x0000000005830000-memory.dmp
    Filesize

    64KB

  • memory/2348-156-0x0000000005820000-0x0000000005830000-memory.dmp
    Filesize

    64KB

  • memory/2600-139-0x00000000054A0000-0x00000000054B0000-memory.dmp
    Filesize

    64KB

  • memory/2600-137-0x00000000054A0000-0x00000000054B0000-memory.dmp
    Filesize

    64KB

  • memory/2600-138-0x00000000051F0000-0x00000000051FA000-memory.dmp
    Filesize

    40KB

  • memory/2600-133-0x0000000000770000-0x000000000085E000-memory.dmp
    Filesize

    952KB

  • memory/2600-136-0x00000000052E0000-0x000000000537C000-memory.dmp
    Filesize

    624KB

  • memory/2600-135-0x0000000005240000-0x00000000052D2000-memory.dmp
    Filesize

    584KB

  • memory/2600-134-0x0000000005750000-0x0000000005CF4000-memory.dmp
    Filesize

    5.6MB

  • memory/3312-167-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/3312-169-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/3312-161-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/3312-162-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/3312-164-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/3312-165-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/3312-166-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/3312-207-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/3312-168-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/3312-159-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/3312-171-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/3312-173-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/3312-206-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/3312-199-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/3312-198-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/3312-192-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/3312-190-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/3312-189-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/3312-188-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/4268-186-0x0000000000400000-0x0000000000457000-memory.dmp
    Filesize

    348KB

  • memory/4268-184-0x0000000000400000-0x0000000000457000-memory.dmp
    Filesize

    348KB

  • memory/4268-182-0x0000000000400000-0x0000000000457000-memory.dmp
    Filesize

    348KB

  • memory/4268-177-0x0000000000400000-0x0000000000457000-memory.dmp
    Filesize

    348KB

  • memory/4672-142-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/4672-140-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/4672-143-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/4672-147-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/4672-150-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/4788-185-0x0000000000400000-0x0000000000424000-memory.dmp
    Filesize

    144KB

  • memory/4788-183-0x0000000000400000-0x0000000000424000-memory.dmp
    Filesize

    144KB

  • memory/4788-181-0x0000000000400000-0x0000000000424000-memory.dmp
    Filesize

    144KB

  • memory/4788-175-0x0000000000400000-0x0000000000424000-memory.dmp
    Filesize

    144KB