Analysis

  • max time kernel
    149s
  • max time network
    130s
  • platform
    windows7_x64
  • resource
    win7-20230220-en
  • resource tags

    arch:x64arch:x86image:win7-20230220-enlocale:en-usos:windows7-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 3 IoCs

    Password recovery tool for various email clients

  • NirSoft WebBrowserPassView 3 IoCs

    Password recovery tool for various web browsers

  • Nirsoft 8 IoCs
  • Executes dropped EXE 7 IoCs
  • Loads dropped DLL 7 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 5 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Suspicious behavior: EnumeratesProcesses 3 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 64 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:1048
    • C:\Users\Admin\AppData\Local\Temp\Curriculum Vitae M.K. Rashitha Udayanga.pdf.exe
      "{path}"
      2⤵
      • Adds Run key to start application
      • Suspicious use of WriteProcessMemory
      PID:1280
      • C:\Windows\SysWOW64\WScript.exe
        "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\install.vbs"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1468
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /c "C:\Users\Admin\AppData\Roaming\oos.exe"
          4⤵
          • Loads dropped DLL
          • Suspicious use of WriteProcessMemory
          PID:1668
          • C:\Users\Admin\AppData\Roaming\oos.exe
            C:\Users\Admin\AppData\Roaming\oos.exe
            5⤵
            • Executes dropped EXE
            • Loads dropped DLL
            • Suspicious use of SetThreadContext
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of WriteProcessMemory
            PID:1372
            • C:\Users\Admin\AppData\Roaming\oos.exe
              "{path}"
              6⤵
              • Executes dropped EXE
              PID:1040
            • C:\Users\Admin\AppData\Roaming\oos.exe
              "{path}"
              6⤵
              • Executes dropped EXE
              • Loads dropped DLL
              • Adds Run key to start application
              • Suspicious use of SetThreadContext
              • Suspicious use of SetWindowsHookEx
              • Suspicious use of WriteProcessMemory
              PID:660
              • C:\Users\Admin\AppData\Roaming\oos.exe
                C:\Users\Admin\AppData\Roaming\oos.exe /stext "C:\Users\Admin\AppData\Local\Temp\xuooofkopy"
                7⤵
                • Executes dropped EXE
                • Suspicious behavior: EnumeratesProcesses
                PID:1912
              • C:\Users\Admin\AppData\Roaming\oos.exe
                C:\Users\Admin\AppData\Roaming\oos.exe /stext "C:\Users\Admin\AppData\Local\Temp\hotzpxvqdgcsg"
                7⤵
                • Executes dropped EXE
                • Suspicious use of AdjustPrivilegeToken
                PID:848
              • C:\Users\Admin\AppData\Roaming\oos.exe
                C:\Users\Admin\AppData\Roaming\oos.exe /stext "C:\Users\Admin\AppData\Local\Temp\sqzriqgjroufrexap"
                7⤵
                • Executes dropped EXE
                • Accesses Microsoft Outlook accounts
                PID:1916
            • C:\Users\Admin\AppData\Roaming\oos.exe
              "{path}"
              6⤵
              • Executes dropped EXE
              PID:1652

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

System Information Discovery

1
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

    d6a1f53c1a15b0a59657ec15c7f5b98b

    SHA1

    e2417d90f1571c00a186d8a6659957164ddc86e9

    SHA256

    3f4ffaf64fd682cdc9b3f1a3d965101a8d391adba1bcd93987785d521ff77206

    SHA512

    5c218bb685b7941ba1e768d256b8680d1d365903e9f775c1975cf3d1ea3be2862c1bb8f0eedf221a466293702dc9bc348aff83bfb189eb723747ae7483d54d80

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

    398B

    MD5

    a5d3440f90cbfae712166e20870eaed7

    SHA1

    cc1e1a2945eb2ad475234344f7527ad9e9873647

    SHA256

    960a570da95b8d16809cbcc18e8ca4d81e16cb666354ddc1d572daf93f291f02

    SHA512

    d3136a280fbb326ccc5cb5ab1214aed8ccd6baa7f3f89ef9e0b5bf391a957dab2c121640bb056e6cbda0594f83133c4dbb4e1e2f0e290b44a401cd2cf8cfd4aa

  • C:\Users\Admin\AppData\Local\Temp\xuooofkopy
    Filesize

    2B

    MD5

    f3b25701fe362ec84616a93a45ce9998

    SHA1

    d62636d8caec13f04e28442a0a6fa1afeb024bbb

    SHA256

    b3d510ef04275ca8e698e5b3cbb0ece3949ef9252f0cdc839e9ee347409a2209

    SHA512

    98c5f56f3de340690c139e58eb7dac111979f0d4dffe9c4b24ff849510f4b6ffa9fd608c0a3de9ac3c9fd2190f0efaf715309061490f9755a9bfdf1c54ca0d84

  • 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

  • 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

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

    929KB

    MD5

    1eee890ebe5e8b5d03a2fae63f791141

    SHA1

    75b0c7cb4069b21b70794d25bd89a3d5bcac8205

    SHA256

    ad3a4db849a64ea07922d63153d3381798b4450f28d8db82c95393a5f6aaa569

    SHA512

    c806dc7c1b857c6823369fb104173243faf350a6f34af92d749b93fd6aad0061d3aa1c24d2e3951341d4c8c17b1c79507d39d0d447940352ead727454aac79ab

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

    929KB

    MD5

    1eee890ebe5e8b5d03a2fae63f791141

    SHA1

    75b0c7cb4069b21b70794d25bd89a3d5bcac8205

    SHA256

    ad3a4db849a64ea07922d63153d3381798b4450f28d8db82c95393a5f6aaa569

    SHA512

    c806dc7c1b857c6823369fb104173243faf350a6f34af92d749b93fd6aad0061d3aa1c24d2e3951341d4c8c17b1c79507d39d0d447940352ead727454aac79ab

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

    929KB

    MD5

    1eee890ebe5e8b5d03a2fae63f791141

    SHA1

    75b0c7cb4069b21b70794d25bd89a3d5bcac8205

    SHA256

    ad3a4db849a64ea07922d63153d3381798b4450f28d8db82c95393a5f6aaa569

    SHA512

    c806dc7c1b857c6823369fb104173243faf350a6f34af92d749b93fd6aad0061d3aa1c24d2e3951341d4c8c17b1c79507d39d0d447940352ead727454aac79ab

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

    929KB

    MD5

    1eee890ebe5e8b5d03a2fae63f791141

    SHA1

    75b0c7cb4069b21b70794d25bd89a3d5bcac8205

    SHA256

    ad3a4db849a64ea07922d63153d3381798b4450f28d8db82c95393a5f6aaa569

    SHA512

    c806dc7c1b857c6823369fb104173243faf350a6f34af92d749b93fd6aad0061d3aa1c24d2e3951341d4c8c17b1c79507d39d0d447940352ead727454aac79ab

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

    929KB

    MD5

    1eee890ebe5e8b5d03a2fae63f791141

    SHA1

    75b0c7cb4069b21b70794d25bd89a3d5bcac8205

    SHA256

    ad3a4db849a64ea07922d63153d3381798b4450f28d8db82c95393a5f6aaa569

    SHA512

    c806dc7c1b857c6823369fb104173243faf350a6f34af92d749b93fd6aad0061d3aa1c24d2e3951341d4c8c17b1c79507d39d0d447940352ead727454aac79ab

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

    929KB

    MD5

    1eee890ebe5e8b5d03a2fae63f791141

    SHA1

    75b0c7cb4069b21b70794d25bd89a3d5bcac8205

    SHA256

    ad3a4db849a64ea07922d63153d3381798b4450f28d8db82c95393a5f6aaa569

    SHA512

    c806dc7c1b857c6823369fb104173243faf350a6f34af92d749b93fd6aad0061d3aa1c24d2e3951341d4c8c17b1c79507d39d0d447940352ead727454aac79ab

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

    929KB

    MD5

    1eee890ebe5e8b5d03a2fae63f791141

    SHA1

    75b0c7cb4069b21b70794d25bd89a3d5bcac8205

    SHA256

    ad3a4db849a64ea07922d63153d3381798b4450f28d8db82c95393a5f6aaa569

    SHA512

    c806dc7c1b857c6823369fb104173243faf350a6f34af92d749b93fd6aad0061d3aa1c24d2e3951341d4c8c17b1c79507d39d0d447940352ead727454aac79ab

  • memory/660-111-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/660-103-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/660-113-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/660-162-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/660-159-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/660-112-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/660-155-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/660-154-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/660-151-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/660-110-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/660-109-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/660-108-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/660-106-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/660-99-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
    Filesize

    4KB

  • memory/660-107-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/660-104-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/848-125-0x0000000000400000-0x0000000000424000-memory.dmp
    Filesize

    144KB

  • memory/848-128-0x0000000000400000-0x0000000000424000-memory.dmp
    Filesize

    144KB

  • memory/848-135-0x0000000000400000-0x0000000000424000-memory.dmp
    Filesize

    144KB

  • memory/848-138-0x0000000000400000-0x0000000000424000-memory.dmp
    Filesize

    144KB

  • memory/848-142-0x0000000000400000-0x0000000000424000-memory.dmp
    Filesize

    144KB

  • memory/848-127-0x0000000000400000-0x0000000000424000-memory.dmp
    Filesize

    144KB

  • memory/848-123-0x0000000000400000-0x0000000000424000-memory.dmp
    Filesize

    144KB

  • memory/848-131-0x0000000000400000-0x0000000000424000-memory.dmp
    Filesize

    144KB

  • memory/1048-54-0x0000000000D90000-0x0000000000E7E000-memory.dmp
    Filesize

    952KB

  • memory/1048-59-0x0000000004E70000-0x0000000004EEA000-memory.dmp
    Filesize

    488KB

  • memory/1048-55-0x0000000004E30000-0x0000000004E70000-memory.dmp
    Filesize

    256KB

  • memory/1048-56-0x0000000000330000-0x000000000033E000-memory.dmp
    Filesize

    56KB

  • memory/1048-57-0x0000000004E30000-0x0000000004E70000-memory.dmp
    Filesize

    256KB

  • memory/1048-58-0x0000000005530000-0x00000000055E8000-memory.dmp
    Filesize

    736KB

  • memory/1280-61-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/1280-62-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/1280-74-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/1280-60-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/1280-71-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/1280-63-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/1280-69-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/1280-66-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/1280-65-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/1280-78-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/1280-68-0x000000007EFDE000-0x000000007EFDF000-memory.dmp
    Filesize

    4KB

  • memory/1280-64-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/1280-67-0x0000000000400000-0x000000000047E000-memory.dmp
    Filesize

    504KB

  • memory/1372-85-0x0000000004BF0000-0x0000000004C30000-memory.dmp
    Filesize

    256KB

  • memory/1372-84-0x0000000004BF0000-0x0000000004C30000-memory.dmp
    Filesize

    256KB

  • memory/1372-83-0x0000000000110000-0x00000000001FE000-memory.dmp
    Filesize

    952KB

  • memory/1912-116-0x0000000000400000-0x0000000000478000-memory.dmp
    Filesize

    480KB

  • memory/1912-153-0x0000000000400000-0x0000000000478000-memory.dmp
    Filesize

    480KB

  • memory/1912-120-0x0000000000400000-0x0000000000478000-memory.dmp
    Filesize

    480KB

  • memory/1912-126-0x0000000000400000-0x0000000000478000-memory.dmp
    Filesize

    480KB

  • memory/1912-115-0x0000000000400000-0x0000000000478000-memory.dmp
    Filesize

    480KB

  • memory/1912-118-0x0000000000400000-0x0000000000478000-memory.dmp
    Filesize

    480KB

  • memory/1912-117-0x0000000000400000-0x0000000000478000-memory.dmp
    Filesize

    480KB

  • memory/1912-148-0x0000000000400000-0x0000000000478000-memory.dmp
    Filesize

    480KB

  • memory/1912-130-0x0000000000400000-0x0000000000478000-memory.dmp
    Filesize

    480KB

  • memory/1916-146-0x0000000000400000-0x0000000000457000-memory.dmp
    Filesize

    348KB

  • memory/1916-136-0x0000000000400000-0x0000000000457000-memory.dmp
    Filesize

    348KB

  • memory/1916-149-0x0000000000400000-0x0000000000457000-memory.dmp
    Filesize

    348KB

  • memory/1916-147-0x0000000000400000-0x0000000000457000-memory.dmp
    Filesize

    348KB

  • memory/1916-137-0x0000000000400000-0x0000000000457000-memory.dmp
    Filesize

    348KB

  • memory/1916-158-0x0000000000400000-0x0000000000457000-memory.dmp
    Filesize

    348KB

  • memory/1916-140-0x0000000000400000-0x0000000000457000-memory.dmp
    Filesize

    348KB

  • memory/1916-143-0x0000000000400000-0x0000000000457000-memory.dmp
    Filesize

    348KB

  • memory/1916-139-0x0000000000400000-0x0000000000457000-memory.dmp
    Filesize

    348KB