Analysis

  • max time kernel
    300s
  • max time network
    122s
  • platform
    windows7_x64
  • resource
    win7-20230831-en
  • resource tags

    arch:x64arch:x86image:win7-20230831-enlocale:en-usos:windows7-x64system
  • submitted
    25/09/2023, 01:37

General

  • Target

    4098aa6438facda5fdc7dd24d893f4b71db89eec6561cb6e08a3b9db2b8902fe.exe

  • Size

    270KB

  • MD5

    60fd337ba59312469cbd074fee9d1b19

  • SHA1

    01200c7c9c2c3709991a4caebd5bbc045941056b

  • SHA256

    4098aa6438facda5fdc7dd24d893f4b71db89eec6561cb6e08a3b9db2b8902fe

  • SHA512

    2769a7f5e900e82c0627b50613a0eba5105718d28392fdbc758be048a44c19aebc5f97d02baa284e21a6055eca3642dc1b1be0b36b6c79866c1e104ab512282c

  • SSDEEP

    6144:cRVhrJ+j+5j68KsT6h/OCy5U9uAOLAm4Mqyqw6:cRLN+j+5+RsqGGuime/w6

Malware Config

Extracted

Family

smokeloader

Version

2022

C2

http://77.91.68.29/fks/

rc4.i32
rc4.i32

Signatures

  • SmokeLoader

    Modular backdoor trojan in use since 2014.

  • Executes dropped EXE 1 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Program crash 1 IoCs
  • Checks SCSI registry key(s) 3 TTPs 3 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious behavior: MapViewOfSection 1 IoCs
  • Suspicious use of WriteProcessMemory 18 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

Processes

  • C:\Users\Admin\AppData\Local\Temp\4098aa6438facda5fdc7dd24d893f4b71db89eec6561cb6e08a3b9db2b8902fe.exe
    "C:\Users\Admin\AppData\Local\Temp\4098aa6438facda5fdc7dd24d893f4b71db89eec6561cb6e08a3b9db2b8902fe.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:2344
    • C:\Windows\Microsoft.NET\Framework\v4.0.30319\AppLaunch.exe
      "C:\Windows\Microsoft.NET\Framework\v4.0.30319\AppLaunch.exe"
      2⤵
      • Checks SCSI registry key(s)
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious behavior: MapViewOfSection
      PID:2276
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2344 -s 52
      2⤵
      • Program crash
      PID:1416
  • C:\Windows\system32\taskeng.exe
    taskeng.exe {67726DAC-E46B-4FD7-AB4C-B746D67BF35C} S-1-5-21-3513876443-2771975297-1923446376-1000:GPFFWLPI\Admin:Interactive:[1]
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2648
    • C:\Users\Admin\AppData\Roaming\ujrcvas
      C:\Users\Admin\AppData\Roaming\ujrcvas
      2⤵
      • Executes dropped EXE
      PID:2568

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        • C:\Users\Admin\AppData\Roaming\ujrcvas

          Filesize

          96KB

          MD5

          7825cad99621dd288da81d8d8ae13cf5

          SHA1

          f3e1ab0c8e4f22e718cdeb6fa5faa87b0e61e73c

          SHA256

          529088553fe9cb3e497ef704ce9bc7bc07630f6ddfad44afb92acfe639789ec5

          SHA512

          2e81251a2c140a96f681fa95d82eee531b391e2654daa90da08d1dd00f13cba949136d465a2dc37507d40b4a708b6fc695baa716f19737591b1a89bd2a4b60b4

        • C:\Users\Admin\AppData\Roaming\ujrcvas

          Filesize

          96KB

          MD5

          7825cad99621dd288da81d8d8ae13cf5

          SHA1

          f3e1ab0c8e4f22e718cdeb6fa5faa87b0e61e73c

          SHA256

          529088553fe9cb3e497ef704ce9bc7bc07630f6ddfad44afb92acfe639789ec5

          SHA512

          2e81251a2c140a96f681fa95d82eee531b391e2654daa90da08d1dd00f13cba949136d465a2dc37507d40b4a708b6fc695baa716f19737591b1a89bd2a4b60b4

        • memory/1264-5-0x0000000002A50000-0x0000000002A66000-memory.dmp

          Filesize

          88KB

        • memory/2276-0-0x0000000000400000-0x0000000000409000-memory.dmp

          Filesize

          36KB

        • memory/2276-1-0x0000000000400000-0x0000000000409000-memory.dmp

          Filesize

          36KB

        • memory/2276-2-0x00000000FFFDE000-0x00000000FFFDF000-memory.dmp

          Filesize

          4KB

        • memory/2276-3-0x0000000000400000-0x0000000000409000-memory.dmp

          Filesize

          36KB

        • memory/2276-4-0x0000000000400000-0x0000000000409000-memory.dmp

          Filesize

          36KB

        • memory/2276-6-0x0000000000400000-0x0000000000409000-memory.dmp

          Filesize

          36KB