Analysis

  • max time kernel
    152s
  • max time network
    13s
  • platform
    windows7_x64
  • resource
    win7v20201028
  • submitted
    14-12-2020 16:25

General

  • Target

    c276255be8c317392e43735e0f707cf9.exe

  • Size

    1.3MB

  • MD5

    c276255be8c317392e43735e0f707cf9

  • SHA1

    8deb38349ef9978a83b8fee521de5e06d2b86052

  • SHA256

    5fe7d9e94105fcb2dd524faee708442a10c98a98c9ea3b6ef35da17b6f7f4f47

  • SHA512

    ebb335783435b6675751d9efaeb601874df6a21f41f9ac0877afc7ab19a5ef7287fa4f8fc81984396a6ff5e29c5a40449635745e3d51a254096d53398b2dd1a3

Malware Config

Signatures

  • Darkcomet

    DarkComet is a remote access trojan (RAT) developed by Jean-Pierre Lesueur.

  • Modifies WinLogon for persistence 2 TTPs 1 IoCs
  • Modifies firewall policy service 2 TTPs 3 IoCs
  • Modifies security service 2 TTPs 1 IoCs
  • Windows security bypass 2 TTPs
  • Disables RegEdit via registry modification
  • Disables Task Manager via registry modification
  • Executes dropped EXE 3 IoCs
  • Sets file to hidden 1 TTPs

    Modifies file attributes to stop it showing in Explorer etc.

  • UPX packed file 5 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

  • Deletes itself 1 IoCs
  • Loads dropped DLL 4 IoCs
  • Windows security modification 2 TTPs 2 IoCs
  • Adds Run key to start application 2 TTPs 2 IoCs
  • Checks whether UAC is enabled 1 TTPs 2 IoCs
  • Drops file in System32 directory 4 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Suspicious behavior: GetForegroundWindowSpam 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 47 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs
  • System policy modification 1 TTPs 3 IoCs
  • Views/modifies file attributes 1 TTPs 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\c276255be8c317392e43735e0f707cf9.exe
    "C:\Users\Admin\AppData\Local\Temp\c276255be8c317392e43735e0f707cf9.exe"
    1⤵
    • Modifies WinLogon for persistence
    • Loads dropped DLL
    • Adds Run key to start application
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1208
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp\c276255be8c317392e43735e0f707cf9.exe" +s +h
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1152
      • C:\Windows\SysWOW64\attrib.exe
        attrib "C:\Users\Admin\AppData\Local\Temp\c276255be8c317392e43735e0f707cf9.exe" +s +h
        3⤵
        • Views/modifies file attributes
        PID:1956
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2028
      • C:\Windows\SysWOW64\attrib.exe
        attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
        3⤵
        • Views/modifies file attributes
        PID:1996
    • C:\Users\Admin\AppData\Local\Temp\RUFUS-3.12.EXE
      "C:\Users\Admin\AppData\Local\Temp\RUFUS-3.12.EXE"
      2⤵
      • Executes dropped EXE
      • Checks whether UAC is enabled
      • Drops file in System32 directory
      • Suspicious use of AdjustPrivilegeToken
      PID:1952
    • C:\Windows\SysWOW64\notepad.exe
      notepad
      2⤵
      • Deletes itself
      PID:792
    • C:\Users\Admin\Documents\MSDCSC\msdcsc.exe
      "C:\Users\Admin\Documents\MSDCSC\msdcsc.exe"
      2⤵
      • Modifies firewall policy service
      • Modifies security service
      • Executes dropped EXE
      • Loads dropped DLL
      • Windows security modification
      • Adds Run key to start application
      • Suspicious behavior: GetForegroundWindowSpam
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      • System policy modification
      PID:564
      • C:\Users\Admin\AppData\Local\Temp\RUFUS-3.12.EXE
        "C:\Users\Admin\AppData\Local\Temp\RUFUS-3.12.EXE"
        3⤵
        • Executes dropped EXE
        • Checks whether UAC is enabled
        • Suspicious behavior: GetForegroundWindowSpam
        PID:824
      • C:\Windows\SysWOW64\notepad.exe
        notepad
        3⤵
          PID:1884

    Network

    MITRE ATT&CK Matrix ATT&CK v6

    Persistence

    Winlogon Helper DLL

    1
    T1004

    Modify Existing Service

    2
    T1031

    Hidden Files and Directories

    2
    T1158

    Registry Run Keys / Startup Folder

    1
    T1060

    Defense Evasion

    Modify Registry

    7
    T1112

    Disabling Security Tools

    2
    T1089

    Hidden Files and Directories

    2
    T1158

    Discovery

    System Information Discovery

    2
    T1082

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Local\Temp\RUFUS-3.12.EXE
      MD5

      cd822912b4ff3c303a62d2538fa88d01

      SHA1

      9bf6d9bbc06150a933b4171d55c7a8a297cd9cc5

      SHA256

      f37771fbb9a9747c255bfed791c8d25b170a05390c07b977ceed83fda2930db0

      SHA512

      dc22c5b25f00a707903e09faa17102afa8c7c33c601c4a9e565f0ba1f9be38b2d3fd33d6cd4fb3f106559826e5b2d4830ebb47f454bd211e948abada5bd40bf7

    • C:\Users\Admin\AppData\Local\Temp\RUFUS-3.12.EXE
      MD5

      cd822912b4ff3c303a62d2538fa88d01

      SHA1

      9bf6d9bbc06150a933b4171d55c7a8a297cd9cc5

      SHA256

      f37771fbb9a9747c255bfed791c8d25b170a05390c07b977ceed83fda2930db0

      SHA512

      dc22c5b25f00a707903e09faa17102afa8c7c33c601c4a9e565f0ba1f9be38b2d3fd33d6cd4fb3f106559826e5b2d4830ebb47f454bd211e948abada5bd40bf7

    • C:\Users\Admin\AppData\Local\Temp\RUFUS-3.12.EXE
      MD5

      cd822912b4ff3c303a62d2538fa88d01

      SHA1

      9bf6d9bbc06150a933b4171d55c7a8a297cd9cc5

      SHA256

      f37771fbb9a9747c255bfed791c8d25b170a05390c07b977ceed83fda2930db0

      SHA512

      dc22c5b25f00a707903e09faa17102afa8c7c33c601c4a9e565f0ba1f9be38b2d3fd33d6cd4fb3f106559826e5b2d4830ebb47f454bd211e948abada5bd40bf7

    • C:\Users\Admin\Documents\MSDCSC\msdcsc.exe
      MD5

      c276255be8c317392e43735e0f707cf9

      SHA1

      8deb38349ef9978a83b8fee521de5e06d2b86052

      SHA256

      5fe7d9e94105fcb2dd524faee708442a10c98a98c9ea3b6ef35da17b6f7f4f47

      SHA512

      ebb335783435b6675751d9efaeb601874df6a21f41f9ac0877afc7ab19a5ef7287fa4f8fc81984396a6ff5e29c5a40449635745e3d51a254096d53398b2dd1a3

    • C:\Users\Admin\Documents\MSDCSC\msdcsc.exe
      MD5

      c276255be8c317392e43735e0f707cf9

      SHA1

      8deb38349ef9978a83b8fee521de5e06d2b86052

      SHA256

      5fe7d9e94105fcb2dd524faee708442a10c98a98c9ea3b6ef35da17b6f7f4f47

      SHA512

      ebb335783435b6675751d9efaeb601874df6a21f41f9ac0877afc7ab19a5ef7287fa4f8fc81984396a6ff5e29c5a40449635745e3d51a254096d53398b2dd1a3

    • \Users\Admin\AppData\Local\Temp\RUFUS-3.12.EXE
      MD5

      cd822912b4ff3c303a62d2538fa88d01

      SHA1

      9bf6d9bbc06150a933b4171d55c7a8a297cd9cc5

      SHA256

      f37771fbb9a9747c255bfed791c8d25b170a05390c07b977ceed83fda2930db0

      SHA512

      dc22c5b25f00a707903e09faa17102afa8c7c33c601c4a9e565f0ba1f9be38b2d3fd33d6cd4fb3f106559826e5b2d4830ebb47f454bd211e948abada5bd40bf7

    • \Users\Admin\AppData\Local\Temp\RUFUS-3.12.EXE
      MD5

      cd822912b4ff3c303a62d2538fa88d01

      SHA1

      9bf6d9bbc06150a933b4171d55c7a8a297cd9cc5

      SHA256

      f37771fbb9a9747c255bfed791c8d25b170a05390c07b977ceed83fda2930db0

      SHA512

      dc22c5b25f00a707903e09faa17102afa8c7c33c601c4a9e565f0ba1f9be38b2d3fd33d6cd4fb3f106559826e5b2d4830ebb47f454bd211e948abada5bd40bf7

    • \Users\Admin\Documents\MSDCSC\msdcsc.exe
      MD5

      c276255be8c317392e43735e0f707cf9

      SHA1

      8deb38349ef9978a83b8fee521de5e06d2b86052

      SHA256

      5fe7d9e94105fcb2dd524faee708442a10c98a98c9ea3b6ef35da17b6f7f4f47

      SHA512

      ebb335783435b6675751d9efaeb601874df6a21f41f9ac0877afc7ab19a5ef7287fa4f8fc81984396a6ff5e29c5a40449635745e3d51a254096d53398b2dd1a3

    • \Users\Admin\Documents\MSDCSC\msdcsc.exe
      MD5

      c276255be8c317392e43735e0f707cf9

      SHA1

      8deb38349ef9978a83b8fee521de5e06d2b86052

      SHA256

      5fe7d9e94105fcb2dd524faee708442a10c98a98c9ea3b6ef35da17b6f7f4f47

      SHA512

      ebb335783435b6675751d9efaeb601874df6a21f41f9ac0877afc7ab19a5ef7287fa4f8fc81984396a6ff5e29c5a40449635745e3d51a254096d53398b2dd1a3

    • memory/564-15-0x0000000000000000-mapping.dmp
    • memory/792-12-0x0000000000000000-mapping.dmp
    • memory/792-11-0x0000000000190000-0x0000000000191000-memory.dmp
      Filesize

      4KB

    • memory/792-10-0x0000000000000000-mapping.dmp
    • memory/824-19-0x0000000000000000-mapping.dmp
    • memory/1152-2-0x0000000000000000-mapping.dmp
    • memory/1884-21-0x0000000000000000-mapping.dmp
    • memory/1884-22-0x00000000001E0000-0x00000000001E1000-memory.dmp
      Filesize

      4KB

    • memory/1884-23-0x0000000000000000-mapping.dmp
    • memory/1952-7-0x0000000000000000-mapping.dmp
    • memory/1956-5-0x0000000000000000-mapping.dmp
    • memory/1996-4-0x0000000000000000-mapping.dmp
    • memory/2028-3-0x0000000000000000-mapping.dmp