Analysis

  • max time kernel
    128s
  • max time network
    131s
  • platform
    windows7_x64
  • resource
    win7-20230220-en
  • resource tags

    arch:x64arch:x86image:win7-20230220-enlocale:en-usos:windows7-x64system
  • submitted
    27-03-2023 09:42

General

  • Target

    bjyk.exe

  • Size

    377KB

  • MD5

    ca7c977b5b315dd62b0189f2619764db

  • SHA1

    42ce52b22e5017990660148ba6c5ff0097c5af01

  • SHA256

    c6d90ced12fb16ca9ae112787ce6d29379b06e0ba0a90595e337c07453a571fa

  • SHA512

    b7be48e4c7ca12e0059a6b0064eaa8e8c1f4bbd7ed62c2a34671a5875ba25715b45b780d54e58f5429b2cade56244f6a820a46c0a45b0f7e9d4567213a499427

  • SSDEEP

    6144:xsItKnWUQpBTyPRqyhYPbncTBlhHrbndnkv0oX90Q1vPjrVCTH3mwVaYo7/8FaA/:OtWUzJq8YPbncT3+vXPjc3xVaYo7UFyO

Malware Config

Signatures

  • Gh0st RAT payload 10 IoCs
  • Gh0strat

    Gh0st RAT is a remote access tool (RAT) with its source code public and it has been used by multiple Chinese groups.

  • ACProtect 1.3x - 1.4x DLL software 2 IoCs

    Detects file using ACProtect software.

  • Deletes itself 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Loads dropped DLL 4 IoCs
  • Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs

    Bootkits write to the MBR to gain persistence at a level below the operating system.

  • Drops file in System32 directory 1 IoCs
  • Checks processor information in registry 2 TTPs 2 IoCs

    Processor information is often read in order to detect sandboxing environments.

  • Modifies data under HKEY_USERS 6 IoCs
  • Suspicious behavior: EnumeratesProcesses 3 IoCs
  • Suspicious use of AdjustPrivilegeToken 18 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 7 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\bjyk.exe
    "C:\Users\Admin\AppData\Local\Temp\bjyk.exe"
    1⤵
    • Loads dropped DLL
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:1396
    • \??\c:\users\admin\appdata\local\epuokhxcrt
      "C:\Users\Admin\AppData\Local\Temp\bjyk.exe" a -sc:\users\admin\appdata\local\temp\bjyk.exe
      2⤵
      • Deletes itself
      • Executes dropped EXE
      • Loads dropped DLL
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      PID:556
  • C:\Windows\SysWOW64\svchost.exe
    C:\Windows\SysWOW64\svchost.exe -k netsvcs
    1⤵
    • Loads dropped DLL
    • Writes to the Master Boot Record (MBR)
    • Drops file in System32 directory
    • Checks processor information in registry
    • Modifies data under HKEY_USERS
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    PID:1956

Network

MITRE ATT&CK Matrix ATT&CK v6

Persistence

Bootkit

1
T1067

Discovery

Query Registry

1
T1012

System Information Discovery

1
T1082

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\Local\epuokhxcrt
    Filesize

    23.2MB

    MD5

    e9c23674528a77777ced3cb12f0009cd

    SHA1

    b506d6bb8006efe6ac56f19b3fc1a95c8907c931

    SHA256

    306f06d4e7a742d32549da538dff06dc7c99881005bcf8f22c692b90d9991e3a

    SHA512

    09ad68e2a0b9b222e134dcaa1133dfd63b5cbfb2bad71689d30c2d8aa7cf50f8c8e471e79ffc96a8123c9fdbb81bca2101950452f5fb40eba23926fb74d50c33

  • \??\c:\programdata\drm\%sessionname%\ubkbp.cc3
    Filesize

    19.0MB

    MD5

    ac0b6d89f1efdcdcff77f16266f3abf7

    SHA1

    2b100b00aca44b1dd653a75185e7e3bf28b46692

    SHA256

    3211e72296ed087ee3d5b1968ff06250cf26a51f2ad4e175ef7c23486c4758dd

    SHA512

    742c13aa287175d174cf972202a1f8a82902fd9fa9c41662cce89474e8aac1db46b8e9765f4c0f8961345a66f03644e57cdc76988b99fe9d6a0821c564ae9c5f

  • \??\c:\users\admin\appdata\local\epuokhxcrt
    Filesize

    23.2MB

    MD5

    e9c23674528a77777ced3cb12f0009cd

    SHA1

    b506d6bb8006efe6ac56f19b3fc1a95c8907c931

    SHA256

    306f06d4e7a742d32549da538dff06dc7c99881005bcf8f22c692b90d9991e3a

    SHA512

    09ad68e2a0b9b222e134dcaa1133dfd63b5cbfb2bad71689d30c2d8aa7cf50f8c8e471e79ffc96a8123c9fdbb81bca2101950452f5fb40eba23926fb74d50c33

  • \ProgramData\DRM\%SESSIONNAME%\ubkbp.cc3
    Filesize

    19.0MB

    MD5

    ac0b6d89f1efdcdcff77f16266f3abf7

    SHA1

    2b100b00aca44b1dd653a75185e7e3bf28b46692

    SHA256

    3211e72296ed087ee3d5b1968ff06250cf26a51f2ad4e175ef7c23486c4758dd

    SHA512

    742c13aa287175d174cf972202a1f8a82902fd9fa9c41662cce89474e8aac1db46b8e9765f4c0f8961345a66f03644e57cdc76988b99fe9d6a0821c564ae9c5f

  • \Users\Admin\AppData\Local\Temp\tmk80C5.tmp
    Filesize

    172KB

    MD5

    685f1cbd4af30a1d0c25f252d399a666

    SHA1

    6a1b978f5e6150b88c8634146f1406ed97d2f134

    SHA256

    0e478c95a7a07570a69e6061e7c1da9001bccad9cc454f2ed4da58824a13e0f4

    SHA512

    6555ad6b4f4f26105ca8aad64501d74519a3e091f559b4b563d6ffb20a2ddfcde65e4fe94971a9bc65e86db577f2548ca00f9920d341c8ea808b04c0947d61d9

  • \Users\Admin\AppData\Local\Temp\wak4E2.tmp
    Filesize

    172KB

    MD5

    685f1cbd4af30a1d0c25f252d399a666

    SHA1

    6a1b978f5e6150b88c8634146f1406ed97d2f134

    SHA256

    0e478c95a7a07570a69e6061e7c1da9001bccad9cc454f2ed4da58824a13e0f4

    SHA512

    6555ad6b4f4f26105ca8aad64501d74519a3e091f559b4b563d6ffb20a2ddfcde65e4fe94971a9bc65e86db577f2548ca00f9920d341c8ea808b04c0947d61d9

  • \Users\Admin\AppData\Local\epuokhxcrt
    Filesize

    23.2MB

    MD5

    e9c23674528a77777ced3cb12f0009cd

    SHA1

    b506d6bb8006efe6ac56f19b3fc1a95c8907c931

    SHA256

    306f06d4e7a742d32549da538dff06dc7c99881005bcf8f22c692b90d9991e3a

    SHA512

    09ad68e2a0b9b222e134dcaa1133dfd63b5cbfb2bad71689d30c2d8aa7cf50f8c8e471e79ffc96a8123c9fdbb81bca2101950452f5fb40eba23926fb74d50c33

  • memory/556-80-0x0000000000400000-0x0000000000432800-memory.dmp
    Filesize

    202KB

  • memory/556-87-0x0000000000330000-0x00000000003A3000-memory.dmp
    Filesize

    460KB

  • memory/556-94-0x0000000000330000-0x00000000003A3000-memory.dmp
    Filesize

    460KB

  • memory/556-95-0x0000000000400000-0x0000000000432800-memory.dmp
    Filesize

    202KB

  • memory/556-82-0x0000000000400000-0x0000000000432800-memory.dmp
    Filesize

    202KB

  • memory/556-79-0x0000000000330000-0x00000000003A3000-memory.dmp
    Filesize

    460KB

  • memory/1396-76-0x0000000000230000-0x000000000023D000-memory.dmp
    Filesize

    52KB

  • memory/1396-58-0x0000000000230000-0x0000000000263000-memory.dmp
    Filesize

    204KB

  • memory/1396-60-0x0000000000230000-0x0000000000263000-memory.dmp
    Filesize

    204KB

  • memory/1396-74-0x0000000000360000-0x00000000003D3000-memory.dmp
    Filesize

    460KB

  • memory/1396-63-0x0000000000400000-0x0000000000432800-memory.dmp
    Filesize

    202KB

  • memory/1396-59-0x0000000000230000-0x0000000000263000-memory.dmp
    Filesize

    204KB

  • memory/1396-57-0x0000000000400000-0x0000000000432800-memory.dmp
    Filesize

    202KB

  • memory/1396-61-0x0000000000360000-0x00000000003D3000-memory.dmp
    Filesize

    460KB

  • memory/1396-64-0x0000000000230000-0x0000000000263000-memory.dmp
    Filesize

    204KB

  • memory/1956-96-0x00000000001E0000-0x00000000001E1000-memory.dmp
    Filesize

    4KB