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Analysis

  • max time kernel
    118s
  • max time network
    148s
  • platform
    windows7_x64
  • resource
    win7-20240319-en
  • resource tags

    arch:x64arch:x86image:win7-20240319-enlocale:en-usos:windows7-x64system
  • submitted
    10/04/2024, 10:04

General

  • Target

    29dc4cae5f08c215d57893483b5b42cb00a2d0e7d8361cda9feeaf515f8b5d9e.exe

  • Size

    22KB

  • MD5

    8c8e184c280db126e6fcfcc507aea925

  • SHA1

    aefab35127292cbe0e1d8a1a2fa7c39c9d72f2ea

  • SHA256

    29dc4cae5f08c215d57893483b5b42cb00a2d0e7d8361cda9feeaf515f8b5d9e

  • SHA512

    eef639853fb52b011fb73dfb3af663d1a2bb11e10fe14c6fc4fbae320ee60d74fb452bbe9af4959930e616025ce213e61614147ea5ee5de466b682c42ac312f2

  • SSDEEP

    384:We4xxecfPta20La2aaX3jcMq+jsT3N/a20TPhAPhknomo7ptYcFwVc03K:We4ec/2IT3+howcltYcFwVc6K

Malware Config

Signatures

  • Drokbk

    Drokbk is a custom .NET dropper and backdoor.

  • Drokbk payload 3 IoCs
  • Creates new service(s) 1 TTPs
  • Executes dropped EXE 1 IoCs
  • Drops file in System32 directory 4 IoCs
  • Launches sc.exe 4 IoCs

    Sc.exe is a Windows utlilty to control services on the system.

  • Enumerates physical storage devices 1 TTPs

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

  • Modifies data under HKEY_USERS 42 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 12 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\29dc4cae5f08c215d57893483b5b42cb00a2d0e7d8361cda9feeaf515f8b5d9e.exe
    "C:\Users\Admin\AppData\Local\Temp\29dc4cae5f08c215d57893483b5b42cb00a2d0e7d8361cda9feeaf515f8b5d9e.exe"
    1⤵
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2176
    • C:\Windows\System32\sc.exe
      "C:\Windows\System32\sc.exe" create "SessionManagerService" binpath= "c:\programdata\SoftwareDistribution\SessionService.exe" start= delayed-auto
      2⤵
      • Launches sc.exe
      PID:2808
    • C:\Windows\System32\sc.exe
      "C:\Windows\System32\sc.exe" config "SessionManagerService" DisplayName= "Session Manager Service"
      2⤵
      • Launches sc.exe
      PID:2668
    • C:\Windows\System32\sc.exe
      "C:\Windows\System32\sc.exe" description "SessionManagerService" "Provides Kernel Compatibility With User Session-Management Service."
      2⤵
      • Launches sc.exe
      PID:1372
    • C:\Windows\System32\sc.exe
      "C:\Windows\System32\sc.exe" start "SessionManagerService"
      2⤵
      • Launches sc.exe
      PID:2976
  • C:\Windows\system32\wbem\WmiApSrv.exe
    C:\Windows\system32\wbem\WmiApSrv.exe
    1⤵
      PID:2292
    • \??\c:\programdata\SoftwareDistribution\SessionService.exe
      c:\programdata\SoftwareDistribution\SessionService.exe
      1⤵
      • Executes dropped EXE
      • Drops file in System32 directory
      • Modifies data under HKEY_USERS
      • Suspicious use of AdjustPrivilegeToken
      PID:3028

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

    • C:\ProgramData\SoftwareDistribution\SessionService.exe

      Filesize

      11KB

      MD5

      14a0e5665a95714ff4951bd35eb73606

      SHA1

      0426f65ea5bcff9e0dc48e236bbec293380ccc43

      SHA256

      a8e18a84898f46cd88813838f5e69f05240c4853af2aee5917dcee3a3e2a5d5a

      SHA512

      fe44d9ae670eac4a39567c4ae8deee6f4205d4908c4f78d822e3bb586c0183de7d6efe4b45f14b92da77fc6c24f426a6af14a3280fd5d4a7faa34123e59a4720

    • C:\Windows\SysWOW64\config\systemprofile\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\94308059B57B3142E455B38A6EB92015

      Filesize

      68KB

      MD5

      29f65ba8e88c063813cc50a4ea544e93

      SHA1

      05a7040d5c127e68c25d81cc51271ffb8bef3568

      SHA256

      1ed81fa8dfb6999a9fedc6e779138ffd99568992e22d300acd181a6d2c8de184

      SHA512

      e29b2e92c496245bed3372578074407e8ef8882906ce10c35b3c8deebfefe01b5fd7f3030acaa693e175f4b7aca6cd7d8d10ae1c731b09c5fa19035e005de3aa

    • C:\Windows\Temp\Tar9D5.tmp

      Filesize

      177KB

      MD5

      435a9ac180383f9fa094131b173a2f7b

      SHA1

      76944ea657a9db94f9a4bef38f88c46ed4166983

      SHA256

      67dc37ed50b8e63272b49a254a6039ee225974f1d767bb83eb1fd80e759a7c34

      SHA512

      1a6b277611959720a9c71114957620517ad94541302f164eb872bd322292a952409bafb8bc2ac793b16ad5f25d83f8594ccff2b7834e3c2b2b941e6fc84c009a

    • memory/2176-14-0x000000001AD20000-0x000000001ADA0000-memory.dmp

      Filesize

      512KB

    • memory/2176-1-0x000007FEF51E0000-0x000007FEF5BCC000-memory.dmp

      Filesize

      9.9MB

    • memory/2176-2-0x000000001AD20000-0x000000001ADA0000-memory.dmp

      Filesize

      512KB

    • memory/2176-0-0x0000000001350000-0x000000000135C000-memory.dmp

      Filesize

      48KB

    • memory/2176-13-0x000007FEF51E0000-0x000007FEF5BCC000-memory.dmp

      Filesize

      9.9MB

    • memory/3028-12-0x0000000003670000-0x00000000036B0000-memory.dmp

      Filesize

      256KB

    • memory/3028-15-0x00000000740A0000-0x000000007478E000-memory.dmp

      Filesize

      6.9MB

    • memory/3028-11-0x00000000740A0000-0x000000007478E000-memory.dmp

      Filesize

      6.9MB

    • memory/3028-10-0x0000000000DC0000-0x0000000000DCA000-memory.dmp

      Filesize

      40KB

    • memory/3028-52-0x0000000003670000-0x00000000036B0000-memory.dmp

      Filesize

      256KB