Analysis

  • max time kernel
    88s
  • max time network
    21s
  • platform
    windows10_x64
  • resource
    win10v20201028
  • submitted
    22-11-2020 00:17

General

  • Target

    226a723ffb4a91d9950a8b266167c5b354ab0db1dc225578494917fe53867ef2.exe

  • Size

    200KB

  • MD5

    c2671bf5b5dedbfd3cfe3f0f944fbe01

  • SHA1

    da3e830011e6f9d41dd6c93fdb48c47c1c6e35e1

  • SHA256

    226a723ffb4a91d9950a8b266167c5b354ab0db1dc225578494917fe53867ef2

  • SHA512

    256bc8582cc9b53b3cf9307a2882117476648ab9df540d501fc5f46a4030beacab9df2019f2d83b0a63d510803cbf6cbae01dc1325588f93a1a74521a07fe4d9

Malware Config

Signatures

  • MountLocker Ransomware

    Ransomware family first seen in late 2020, which threatens to leak files if ransom is not paid.

  • Deletes shadow copies 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

  • Modifies extensions of user files 6 IoCs

    Ransomware generally changes the extension on encrypted files.

  • Drops desktop.ini file(s) 27 IoCs
  • Modifies service 2 TTPs 4 IoCs
  • Drops file in Program Files directory 8360 IoCs
  • Interacts with shadow copies 2 TTPs 1 IoCs

    Shadow copies are often targeted by ransomware to inhibit system recovery.

  • Modifies registry class 5 IoCs
  • Suspicious behavior: EnumeratesProcesses 6 IoCs
  • Suspicious use of AdjustPrivilegeToken 6 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 12 IoCs
  • Views/modifies file attributes 1 TTPs 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\226a723ffb4a91d9950a8b266167c5b354ab0db1dc225578494917fe53867ef2.exe
    "C:\Users\Admin\AppData\Local\Temp\226a723ffb4a91d9950a8b266167c5b354ab0db1dc225578494917fe53867ef2.exe"
    1⤵
    • Modifies extensions of user files
    • Drops desktop.ini file(s)
    • Drops file in Program Files directory
    • Modifies registry class
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:816
    • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      powershell.exe -windowstyle hidden -c $mypid='816';[System.IO.File]::ReadAllText('C:\Users\Admin\AppData\Local\Temp\~259283531.tmp')|iex
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:2216
      • C:\Windows\SysWOW64\vssadmin.exe
        "C:\Windows\system32\vssadmin.exe" delete shadows /all /Quiet
        3⤵
        • Interacts with shadow copies
        PID:1956
    • C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\\0F7599B0.bat" "C:\Users\Admin\AppData\Local\Temp\226a723ffb4a91d9950a8b266167c5b354ab0db1dc225578494917fe53867ef2.exe""
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3584
      • C:\Windows\SysWOW64\attrib.exe
        attrib -s -r -h "C:\Users\Admin\AppData\Local\Temp\226a723ffb4a91d9950a8b266167c5b354ab0db1dc225578494917fe53867ef2.exe"
        3⤵
        • Views/modifies file attributes
        PID:3716
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Modifies service
    • Suspicious use of AdjustPrivilegeToken
    PID:2992

Network

MITRE ATT&CK Matrix ATT&CK v6

Persistence

Modify Existing Service

1
T1031

Hidden Files and Directories

1
T1158

Defense Evasion

File Deletion

2
T1107

Modify Registry

1
T1112

Hidden Files and Directories

1
T1158

Impact

Inhibit System Recovery

2
T1490

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\Local\Temp\0F7599B0.bat
    MD5

    348cae913e496198548854f5ff2f6d1e

    SHA1

    a07655b9020205bd47084afd62a8bb22b48c0cdc

    SHA256

    c80128f51871eec3ae2057989a025ce244277c1c180498a5aaef45d5214b8506

    SHA512

    799796736d41d3fcb5a7c859571bb025ca2d062c4b86e078302be68c1a932ed4f78e003640df5405274364b5a9a9c0ba5e37177997683ee7ab54e5267590b611

  • C:\Users\Admin\AppData\Local\Temp\~259283531.tmp
    MD5

    4e1a1e3e715c291c71950d2fdc79e2be

    SHA1

    dc2b3d20a9ec88e0d8d75c5097154687acc42983

    SHA256

    acf88b9224ae067d92882d1c8ec1461a663e83f02848488ce125dc0538d87a39

    SHA512

    d1be9f6459c248a93c95cc40a68e60ca2fe8068ff4ed5d442437a72bcc09ebf8568e3338d39abebbf3fe8e9e4e3a21a58e1ed6bdbcdd0a3b2ca46b6a81597d80

  • memory/816-2-0x0000000002BF0000-0x0000000002BFF000-memory.dmp
    Filesize

    60KB

  • memory/1956-17-0x0000000000000000-mapping.dmp
  • memory/2216-7-0x00000000075F0000-0x00000000075F1000-memory.dmp
    Filesize

    4KB

  • memory/2216-15-0x0000000009D20000-0x0000000009D21000-memory.dmp
    Filesize

    4KB

  • memory/2216-8-0x0000000007690000-0x0000000007691000-memory.dmp
    Filesize

    4KB

  • memory/2216-9-0x0000000007E90000-0x0000000007E91000-memory.dmp
    Filesize

    4KB

  • memory/2216-10-0x00000000080E0000-0x00000000080E1000-memory.dmp
    Filesize

    4KB

  • memory/2216-11-0x0000000007350000-0x0000000007351000-memory.dmp
    Filesize

    4KB

  • memory/2216-12-0x0000000007F00000-0x0000000007F01000-memory.dmp
    Filesize

    4KB

  • memory/2216-13-0x0000000008870000-0x0000000008871000-memory.dmp
    Filesize

    4KB

  • memory/2216-5-0x0000000007020000-0x0000000007021000-memory.dmp
    Filesize

    4KB

  • memory/2216-6-0x00000000077F0000-0x00000000077F1000-memory.dmp
    Filesize

    4KB

  • memory/2216-16-0x00000000094D0000-0x00000000094D1000-memory.dmp
    Filesize

    4KB

  • memory/2216-4-0x0000000073EA0000-0x000000007458E000-memory.dmp
    Filesize

    6.9MB

  • memory/2216-18-0x00000000098A0000-0x00000000098A1000-memory.dmp
    Filesize

    4KB

  • memory/2216-19-0x00000000095D0000-0x00000000095D1000-memory.dmp
    Filesize

    4KB

  • memory/2216-20-0x000000000A8A0000-0x000000000A8A1000-memory.dmp
    Filesize

    4KB

  • memory/2216-3-0x0000000000000000-mapping.dmp
  • memory/3584-21-0x0000000000000000-mapping.dmp
  • memory/3716-23-0x0000000000000000-mapping.dmp