Analysis

  • max time kernel
    157s
  • max time network
    160s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231215-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
  • submitted
    14/02/2024, 07:36

General

  • Target
    9b21cde6bf0bdbd2c43950a138f90b1c.exe
  • Size 437KB
  • Sample240214-jfftpaea32
  • SHA256 7a3caaf060953f658a47fe9e6e5c41c4c77dee2aa1d777f2d3d07676bf7712a5
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Signatures

  • Checks computer location settings 2 TTPs 2 IoCs

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

  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 4 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Installs/modifies Browser Helper Object 2 TTPs 2 IoCs

    BHOs are DLL modules which act as plugins for Internet Explorer.

  • Enumerates physical storage devices 1 TTPs

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

  • Checks processor information in registry 2 TTPs 3 IoCs

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

  • Enumerates system info in registry 2 TTPs 3 IoCs
  • Modifies registry class 47 IoCs
  • Suspicious behavior: AddClipboardFormatListener 2 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SendNotifyMessage 64 IoCs
  • Suspicious use of SetWindowsHookEx 16 IoCs
  • Suspicious use of WriteProcessMemory 8 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\9b21cde6bf0bdbd2c43950a138f90b1c.exe
    "C:\Users\Admin\AppData\Local\Temp\9b21cde6bf0bdbd2c43950a138f90b1c.exe"
    1⤵
    • Checks computer location settings
    • Loads dropped DLL
    • Suspicious use of WriteProcessMemory
    PID:4600
    • C:\Users\Admin\AppData\Local\Temp\RarSFX0\rinst.exe
      "C:\Users\Admin\AppData\Local\Temp\RarSFX0\rinst.exe"
      2⤵
      • Checks computer location settings
      • Executes dropped EXE
      • Modifies registry class
      • Suspicious use of WriteProcessMemory
      PID:4364
      • C:\Program Files\Microsoft Office\Root\Office16\WINWORD.EXE
        "C:\Program Files\Microsoft Office\Root\Office16\WINWORD.EXE" /n "C:\Users\Admin\AppData\Local\Temp\RarSFX0\birthday_card12.doc" /o ""
        3⤵
        • Checks processor information in registry
        • Enumerates system info in registry
        • Suspicious behavior: AddClipboardFormatListener
        • Suspicious use of SetWindowsHookEx
        PID:4952
      • C:\sysfiles\testbkp.exe
        C:\sysfiles\testbkp.exe
        3⤵
        • Executes dropped EXE
        • Loads dropped DLL
        • Adds Run key to start application
        • Installs/modifies Browser Helper Object
        • Modifies registry class
        • Suspicious use of FindShellTrayWindow
        • Suspicious use of SendNotifyMessage
        • Suspicious use of SetWindowsHookEx
        PID:3720

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        birthday_card12.doc

        • Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\birthday_card12.doc
        • Size 228KB
        • SHA256 b5239f4089adea1a52f3978c416b32a05940966f124f31fcf76ae6d2c0c1db5c
        • MD5 SHA1 SHA512 SSDEEP

        inst.dat

        • Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\inst.dat
        • Size 996B
        • SHA256 98d098087497d7e3558051d1609985cb10adc942923e823e26d618d927a9fbea
        • MD5 SHA1 SHA512

        pk.bin

        • Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\pk.bin
        • Size 3KB
        • SHA256 5893ca5c22de4ac35614c836e93759013ab294cedd266046a4db9dfdffd8c623
        • MD5 SHA1 SHA512

        rinst.exe

        • Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\rinst.exe
        • Size 7KB
        • SHA256 446658dd5af649857fff445c600f26cdc1d0c19c86a080f312b89b1890182092
        • MD5 SHA1 SHA512 SSDEEP

        testbkp.exe

        • Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\testbkp.exe
        • Size 400KB
        • SHA256 db46177f12a75c61a34228786cce40274feac9b91af3b8108862866cbcb7aec8
        • MD5 SHA1 SHA512 SSDEEP

        testbkphk.dll

        • Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\testbkphk.dll
        • Size 24KB
        • SHA256 f29e5bbce4a5d4bc22281f98834fb6b98b59265ad177fea5ac11a17db9a0341c
        • MD5 SHA1 SHA512 SSDEEP

        testbkpwb.dll

        • Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\testbkpwb.dll
        • Size 40KB
        • SHA256 e8ca2d684edc6a9010a8fab08975d73c4d63890ee27bb266d2175d16f619bd4d
        • MD5 SHA1 SHA512 SSDEEP

        pk.bin

        • Path C:\sysfiles\pk.bin
        • Size 3KB
        • SHA256 f1757d4cd8483f505dfa96d2419a0cfc6627eb6934d9360eb15e5b34e5986925
        • MD5 SHA1 SHA512

        testbkp.exe

        • Path C:\sysfiles\testbkp.exe
        • Size 139KB
        • SHA256 fccb0b408fc1279015b151080df91afcfc4812c31fd2beea640af88fdb1aa9f3
        • MD5 SHA1 SHA512 SSDEEP

        testbkp.exe

        • Path C:\sysfiles\testbkp.exe
        • Size 400KB
        • SHA256 cbc8cf389f07bdcc20f04a4b9134bae894081ffac27555afb0dd1f6d7aa57450
        • MD5 SHA1 SHA512 SSDEEP

        testbkphk.dll

        • Path C:\sysfiles\testbkphk.dll
        • Size 24KB
        • SHA256 cfb1a5165cfb64dc8e33f2e265ffc41a62b18539582ac1d3c2dcc55f5b40719c
        • MD5 SHA1 SHA512 SSDEEP

        testbkpwb.dll

        • Path C:\sysfiles\testbkpwb.dll
        • Size 40KB
        • SHA256 3285df0c25d4b9b6d5ccbe166a3ce3d04f5cb3a0d61c8bf29bf5f953e51b0977
        • MD5 SHA1 SHA512 SSDEEP

        memory/4600-76-0x0000000000400000-0x0000000000412000-memory.dmp

        memory/4600-66-0x0000000000400000-0x0000000000412000-memory.dmp

        memory/4952-43-0x00007FFC48D50000-0x00007FFC48F45000-memory.dmp

        memory/4952-63-0x00007FFC48D50000-0x00007FFC48F45000-memory.dmp

        memory/4952-45-0x00007FFC48D50000-0x00007FFC48F45000-memory.dmp

        memory/4952-46-0x00007FFC48D50000-0x00007FFC48F45000-memory.dmp

        memory/4952-47-0x00007FFC08DD0000-0x00007FFC08DE0000-memory.dmp

        memory/4952-48-0x00007FFC48D50000-0x00007FFC48F45000-memory.dmp

        memory/4952-49-0x00007FFC08DD0000-0x00007FFC08DE0000-memory.dmp

        memory/4952-56-0x00007FFC48D50000-0x00007FFC48F45000-memory.dmp

        memory/4952-53-0x00007FFC48D50000-0x00007FFC48F45000-memory.dmp

        memory/4952-57-0x00007FFC48D50000-0x00007FFC48F45000-memory.dmp

        memory/4952-58-0x00007FFC48D50000-0x00007FFC48F45000-memory.dmp

        memory/4952-59-0x00007FFC06680000-0x00007FFC06690000-memory.dmp

        memory/4952-60-0x00007FFC48D50000-0x00007FFC48F45000-memory.dmp

        memory/4952-61-0x00007FFC48D50000-0x00007FFC48F45000-memory.dmp

        memory/4952-62-0x00007FFC48D50000-0x00007FFC48F45000-memory.dmp

        memory/4952-41-0x00007FFC08DD0000-0x00007FFC08DE0000-memory.dmp

        memory/4952-64-0x00007FFC06680000-0x00007FFC06690000-memory.dmp

        memory/4952-65-0x00007FFC48D50000-0x00007FFC48F45000-memory.dmp

        memory/4952-42-0x00007FFC08DD0000-0x00007FFC08DE0000-memory.dmp

        memory/4952-44-0x00007FFC08DD0000-0x00007FFC08DE0000-memory.dmp

        memory/4952-83-0x00007FFC48D50000-0x00007FFC48F45000-memory.dmp

        memory/4952-84-0x00007FFC48D50000-0x00007FFC48F45000-memory.dmp

        memory/4952-85-0x00007FFC48D50000-0x00007FFC48F45000-memory.dmp

        memory/4952-104-0x00007FFC08DD0000-0x00007FFC08DE0000-memory.dmp

        memory/4952-105-0x00007FFC08DD0000-0x00007FFC08DE0000-memory.dmp

        memory/4952-106-0x00007FFC08DD0000-0x00007FFC08DE0000-memory.dmp

        memory/4952-109-0x00007FFC48D50000-0x00007FFC48F45000-memory.dmp

        memory/4952-108-0x00007FFC08DD0000-0x00007FFC08DE0000-memory.dmp

        memory/4952-110-0x00007FFC48D50000-0x00007FFC48F45000-memory.dmp

        memory/4952-111-0x00007FFC48D50000-0x00007FFC48F45000-memory.dmp

        memory/4952-107-0x00007FFC48D50000-0x00007FFC48F45000-memory.dmp