Analysis

  • max time kernel
    148s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240426-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
  • submitted
    24/05/2024, 01:26

General

  • Target
    OSE - PO & FCST - ???-LT24052303183991-01.exe
  • Size 15.0MB
  • Sample240524-bth7zagb7w
  • SHA256 1dd45a1200496700a9a9e138a0ecf1625c981855159ceb8624fe69b8bcfe3bb5
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • remcos

Botnet
  • RemoteHost

C2
  • b64c611.ddnss.eu:3154

Attributes
  • audio_folder

    MicRecords

  • audio_record_time

    5

  • connect_delay

    0

  • connect_interval

    1

  • copy_file

    uytrs.exe

  • copy_folder

    iu7y6tr

  • delete_file

    false

  • hide_file

    false

  • hide_keylog_file

    true

  • install_flag

    false

  • keylog_crypt

    true

  • keylog_file

    u8tus.dat

  • keylog_flag

    false

  • keylog_folder

    87y6trf

  • mouse_option

    false

  • mutex

    OIUGH6-BFBAXD

  • 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 2 IoCs

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

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

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

  • Gathers network information 2 TTPs 2 IoCs

    Uses commandline utility to view network configuration.

  • Modifies registry class 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 12 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 26 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\OSE - PO & FCST - ___-LT24052303183991-01.exe
    "C:\Users\Admin\AppData\Local\Temp\OSE - PO & FCST - ___-LT24052303183991-01.exe"
    1⤵
    • Checks computer location settings
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:1136
    • C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\RarSFX0\dvlv.vbe"
      2⤵
      • Checks computer location settings
      • Suspicious use of WriteProcessMemory
      PID:5052
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /c ipconfig /release
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:4672
        • C:\Windows\SysWOW64\ipconfig.exe
          ipconfig /release
          4⤵
          • Gathers network information
          PID:4788
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /c ttujxo.dll hghnvjmhol.mp3
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:4236
        • C:\Users\Admin\AppData\Local\Temp\RarSFX0\ttujxo.dll
          ttujxo.dll hghnvjmhol.mp3
          4⤵
          • Executes dropped EXE
          • Adds Run key to start application
          • Suspicious use of SetThreadContext
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:1864
          • C:\Users\Admin\AppData\Local\Temp\RegSvcs.exe
            "C:\Users\Admin\AppData\Local\Temp\RegSvcs.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of SetWindowsHookEx
            PID:4324
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /c ipconfig /renew
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:4612
        • C:\Windows\SysWOW64\ipconfig.exe
          ipconfig /renew
          4⤵
          • Gathers network information
          PID:964

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        u8tus.dat

        • Path C:\ProgramData\87y6trf\u8tus.dat
        • Size 144B
        • SHA256 db25cc83bf60a813cc2cef52b293c42077c5f3d204ab58a09f8fb6acec2e8526
        • MD5 SHA1 SHA512

        adkwpjv.jpg

        • Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\adkwpjv.jpg
        • Size 554B
        • SHA256 7d11a8485973e0bc566c1db8fdd856c330912875f6b5ab926055566442d3aaa8
        • MD5 SHA1 SHA512

        akxhkp.xl

        • Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\akxhkp.xl
        • Size 586B
        • SHA256 30bc8aee625a4fc70fb99eb0fe99aae51101a78fc1d7ce6cf88b9ad8b974225c
        • MD5 SHA1 SHA512

        ccfuehe.txt

        • Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\ccfuehe.txt
        • Size 548B
        • SHA256 ea4fc55e495c8888425bd5d58ca715629bc6394cadec75aa4584c38f5639118c
        • MD5 SHA1 SHA512

        dqvn.ics

        • Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\dqvn.ics
        • Size 882KB
        • SHA256 b7a631d237298b76fc459dc3046bd310a3e9dcb57112caf478b08592a9e0d143
        • MD5 SHA1 SHA512 SSDEEP

        dvlv.vbe

        • Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\dvlv.vbe
        • Size 84KB
        • SHA256 b0ecd1e6ab42c8c2872837818659757d25a45759d94233f8bb792a460bd779e7
        • MD5 SHA1 SHA512 SSDEEP

        eaxutnil.exe

        • Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\eaxutnil.exe
        • Size 625B
        • SHA256 e84a46926dc23fc9ae49b564e0350187faa1233abdda99fc16c050a224950b31
        • MD5 SHA1 SHA512

        hhhsam.icm

        • Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\hhhsam.icm
        • Size 560B
        • SHA256 90ca364fa9f567cf377238ed00778fc89bd4e6edda37d1bfc08359152d523ce1
        • MD5 SHA1 SHA512

        ixvwpug.xls

        • Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\ixvwpug.xls
        • Size 529B
        • SHA256 82a02b6a19ef473dd8658f1ac296972f384c40cdb9d7066bb59d6896e7ca4faf
        • MD5 SHA1 SHA512

        kausl.msc

        • Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\kausl.msc
        • Size 550B
        • SHA256 5dfcd6be5cbd28f62c03acfd5e3b5b556887826da98fea9ad4527577a4fa0ed4
        • MD5 SHA1 SHA512

        kpklatl.pdf

        • Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\kpklatl.pdf
        • Size 596B
        • SHA256 b214487887bfec30ccf89d31c79c9e8a4b997b6f128d5f35d7a0b5d41475de42
        • MD5 SHA1 SHA512

        psud.jpg

        • Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\psud.jpg
        • Size 649B
        • SHA256 beedd19808df570ba564bb5eba0ce432346d23285f854523914b234c9879f810
        • MD5 SHA1 SHA512

        pthiwoamn.bin

        • Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\pthiwoamn.bin
        • Size 34KB
        • SHA256 0abedc60fda83fcad7c3b8d40e8cc6159b8bb033ea9dc0a1e24ee8d5118407c0
        • MD5 SHA1 SHA512 SSDEEP

        pthiwoamn.bin

        • Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\pthiwoamn.bin
        • Size 34KB
        • SHA256 db755fda24ff2b5cd7fbd953dc523298d0c4cf4029b4c3efc27559ccb8f37f83
        • MD5 SHA1 SHA512 SSDEEP

        qurddcxnm.dll

        • Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\qurddcxnm.dll
        • Size 620B
        • SHA256 152aef9576a636e3e816316af35335e9ea7975578663ef09abd9a92151c89cf7
        • MD5 SHA1 SHA512

        tlifisl.docx

        • Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\tlifisl.docx
        • Size 646B
        • SHA256 14ea61c83d53e06f750ddcfd89edf54e17a0d91f8436b801f79892172785db92
        • MD5 SHA1 SHA512

        ttujxo.dll

        • Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\ttujxo.dll
        • Size 872KB
        • SHA256 237d1bca6e056df5bb16a1216a434634109478f882d3b1d58344c801d184f95d
        • MD5 SHA1 SHA512 SSDEEP

        tufkdrjntj.mp2

        • Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\tufkdrjntj.mp2
        • Size 642B
        • SHA256 528166f38e46858c3c46e2fcffb2baccc77b558799e83acc0d598d36225c8a57
        • MD5 SHA1 SHA512

        twklhta.txt

        • Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\twklhta.txt
        • Size 507B
        • SHA256 024718705fce4644cb98c19687383729ecef949e88576a6421a1d77179fce678
        • MD5 SHA1 SHA512

        vkhuddrb.ppt

        • Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\vkhuddrb.ppt
        • Size 503B
        • SHA256 f94bdca1bc2f36f20a4731a980779bc85fb9f9e022bbedcb6b85ae12fcbd851d
        • MD5 SHA1 SHA512

        wrprwamnt.msc

        • Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\wrprwamnt.msc
        • Size 547B
        • SHA256 3508682f67971cd41747e16734c952fb223875284dcbec53801b26346abfcea5
        • MD5 SHA1 SHA512

        RegSvcs.exe

        • Path C:\Users\Admin\AppData\Local\Temp\RegSvcs.exe
        • Size 44KB
        • SHA256 2c1eeb7097023c784c2bd040a2005a5070ed6f3a4abf13929377a9e39fab1390
        • MD5 SHA1 SHA512 SSDEEP

        memory/4324-132-0x0000000000D00000-0x0000000001D00000-memory.dmp

        memory/4324-141-0x0000000000D00000-0x0000000001D00000-memory.dmp

        memory/4324-125-0x0000000000D00000-0x0000000001D00000-memory.dmp

        memory/4324-130-0x0000000000D00000-0x0000000001D00000-memory.dmp

        memory/4324-126-0x0000000000D00000-0x0000000001D00000-memory.dmp

        memory/4324-133-0x0000000000D00000-0x0000000001D00000-memory.dmp

        memory/4324-131-0x0000000000D00000-0x0000000001D00000-memory.dmp

        memory/4324-123-0x0000000000D00000-0x0000000001D00000-memory.dmp

        memory/4324-142-0x0000000000D00000-0x0000000001D00000-memory.dmp

        memory/4324-129-0x0000000000D00000-0x0000000001D00000-memory.dmp

        memory/4324-150-0x0000000000D00000-0x0000000001D00000-memory.dmp

        memory/4324-149-0x0000000000D00000-0x0000000001D00000-memory.dmp

        memory/4324-157-0x0000000000D00000-0x0000000001D00000-memory.dmp

        memory/4324-165-0x0000000000D00000-0x0000000001D00000-memory.dmp

        memory/4324-166-0x0000000000D00000-0x0000000001D00000-memory.dmp