Analysis

  • max time kernel
    149s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17/03/2023, 06:18

General

  • Target

    service.exe

  • Size

    283KB

  • MD5

    c801ed2ca1f4f204ca5d28a6ab366949

  • SHA1

    781f35df9b44560982623ef0259a05fbf99b8fcc

  • SHA256

    c83bb3ba68f3f4fde63abea1a95a89566c4a8b75bac40d47b8733a1dac0d1658

  • SHA512

    2d910f09aaeaf0ad6e769f5148ce61f4d284468da1f109434602e2e4c7ddd567d41cd6dae95aba72133dc77fcf35d9814be6c645d05f40d8268ab9036adce45b

  • SSDEEP

    6144:7gZiAEAO0sByNsAal3gVAWgS7/OhwjKfqZr:7gZXEAO/BUdG3gVdt7KnfqZr

Malware Config

Extracted

Language
ps1
Source
URLs
exe.dropper

https://pastebin.com/raw/vNcCt60A

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

Default

Mutex

Mutex

Attributes
  • delay

    3

  • install

    false

  • install_folder

    %AppData%

  • pastebin_config

    https://pastebin.com/raw/s14cUU5G

aes.plain

Signatures

  • AsyncRat

    AsyncRAT is designed to remotely monitor and control other computers written in C#.

  • Async RAT payload 3 IoCs
  • Blocklisted process makes network request 2 IoCs
  • Downloads MZ/PE file
  • Sets file to hidden 1 TTPs 1 IoCs

    Modifies file attributes to stop it showing in Explorer etc.

  • Checks computer location settings 2 TTPs 2 IoCs

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

  • Drops startup file 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs
  • Enumerates physical storage devices 1 TTPs

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

  • Modifies registry class 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 24 IoCs
  • Suspicious use of WriteProcessMemory 12 IoCs
  • Views/modifies file attributes 1 TTPs 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\service.exe
    "C:\Users\Admin\AppData\Local\Temp\service.exe"
    1⤵
    • Checks computer location settings
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:824
    • C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\RarSFX0\config.vbs"
      2⤵
      • Checks computer location settings
      • Suspicious use of WriteProcessMemory
      PID:1068
      • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Unrestricted -nologo -command .\service.ps1
        3⤵
        • Blocklisted process makes network request
        • Drops startup file
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:4696
        • C:\Windows\SysWOW64\attrib.exe
          "C:\Windows\System32\attrib.exe" +s +h .\\tmp7DD6.exe
          4⤵
          • Sets file to hidden
          • Drops startup file
          • Views/modifies file attributes
          PID:2720
        • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\tmp7DD6.exe
          "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\tmp7DD6.exe"
          4⤵
          • Executes dropped EXE
          • Suspicious use of AdjustPrivilegeToken
          PID:652

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\Users\Admin\AppData\Local\Temp\RarSFX0\config.vbs

          Filesize

          149B

          MD5

          a5871da9a2df94e7f9e631b8d88db6f2

          SHA1

          0fe4a2d4ee43f0ddd04fdf6fcf18ea157f197b6b

          SHA256

          c3da432bc28fc4cd5346b0b1350217dbc1fb5939dd3436a1a1415d5f5a4c821d

          SHA512

          4c31e60bd2d823eec6f3c83973b0845c104632006877e3960ff3c7abc69b05f41d09a2dcede557d642b5e74a128800dfd543f2f88026a1400172ec4ea850084c

        • C:\Users\Admin\AppData\Local\Temp\RarSFX0\service.ps1

          Filesize

          949B

          MD5

          8a97b217587bf21df5b6be29428a1251

          SHA1

          33bc1ad54acc40f29d1b09767811c4a9f779f9a5

          SHA256

          ac975c8129b58f138e0f9880d5d63e6ca9e350c875e09a6dd5c16b40eaa9ea0d

          SHA512

          944c4fbbb3e92afad4cb4fc9f675cbe0b12ff3ef371fa1a5acdffb8489d7c7dde6e2cb8c2a1e194db9eba8e7c74db82b91ceaa40bc3f189924adaeae01cc2409

        • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_qqoifdut.ijp.ps1

          Filesize

          60B

          MD5

          d17fe0a3f47be24a6453e9ef58c94641

          SHA1

          6ab83620379fc69f80c0242105ddffd7d98d5d9d

          SHA256

          96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

          SHA512

          5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

        • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\tmp7DD6.exe

          Filesize

          48KB

          MD5

          fa378b2bb6985eec44142dca9f381985

          SHA1

          5b6614fcfc131772ab7d8e9df13b84a9c8b8aec0

          SHA256

          07280cbf4815aba1b1841d4eeb86df01483c240301006c4f1d566e152e1ad783

          SHA512

          117dbd8efaedec137667fd6cd64db0ad2d1396118aeb29fcbf2e7876c4f68d085ccfe5526f586aedbd5e22d4f4e986ff1660b182e6f375d46cd900efe57cc0fa

        • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\tmp7DD6.exe

          Filesize

          48KB

          MD5

          fa378b2bb6985eec44142dca9f381985

          SHA1

          5b6614fcfc131772ab7d8e9df13b84a9c8b8aec0

          SHA256

          07280cbf4815aba1b1841d4eeb86df01483c240301006c4f1d566e152e1ad783

          SHA512

          117dbd8efaedec137667fd6cd64db0ad2d1396118aeb29fcbf2e7876c4f68d085ccfe5526f586aedbd5e22d4f4e986ff1660b182e6f375d46cd900efe57cc0fa

        • memory/652-191-0x0000000005770000-0x0000000005780000-memory.dmp

          Filesize

          64KB

        • memory/652-190-0x0000000005770000-0x0000000005780000-memory.dmp

          Filesize

          64KB

        • memory/652-187-0x0000000000E00000-0x0000000000E12000-memory.dmp

          Filesize

          72KB

        • memory/4696-163-0x0000000008040000-0x00000000086BA000-memory.dmp

          Filesize

          6.5MB

        • memory/4696-177-0x0000000007E40000-0x0000000007E5E000-memory.dmp

          Filesize

          120KB

        • memory/4696-146-0x00000000057F0000-0x0000000005856000-memory.dmp

          Filesize

          408KB

        • memory/4696-158-0x0000000002490000-0x00000000024A0000-memory.dmp

          Filesize

          64KB

        • memory/4696-159-0x0000000006DC0000-0x0000000006E56000-memory.dmp

          Filesize

          600KB

        • memory/4696-160-0x0000000006330000-0x000000000634A000-memory.dmp

          Filesize

          104KB

        • memory/4696-161-0x0000000006380000-0x00000000063A2000-memory.dmp

          Filesize

          136KB

        • memory/4696-162-0x0000000007410000-0x00000000079B4000-memory.dmp

          Filesize

          5.6MB

        • memory/4696-145-0x0000000005710000-0x0000000005776000-memory.dmp

          Filesize

          408KB

        • memory/4696-164-0x0000000007130000-0x0000000007162000-memory.dmp

          Filesize

          200KB

        • memory/4696-165-0x0000000002490000-0x00000000024A0000-memory.dmp

          Filesize

          64KB

        • memory/4696-166-0x0000000002490000-0x00000000024A0000-memory.dmp

          Filesize

          64KB

        • memory/4696-167-0x000000006F180000-0x000000006F1CC000-memory.dmp

          Filesize

          304KB

        • memory/4696-156-0x0000000005DF0000-0x0000000005E0E000-memory.dmp

          Filesize

          120KB

        • memory/4696-178-0x0000000007F60000-0x0000000007F6A000-memory.dmp

          Filesize

          40KB

        • memory/4696-179-0x000000007FD00000-0x000000007FD10000-memory.dmp

          Filesize

          64KB

        • memory/4696-180-0x0000000007FA0000-0x0000000007FAE000-memory.dmp

          Filesize

          56KB

        • memory/4696-181-0x0000000008000000-0x000000000801A000-memory.dmp

          Filesize

          104KB

        • memory/4696-182-0x0000000007FF0000-0x0000000007FF8000-memory.dmp

          Filesize

          32KB

        • memory/4696-183-0x0000000002490000-0x00000000024A0000-memory.dmp

          Filesize

          64KB

        • memory/4696-144-0x0000000005570000-0x0000000005592000-memory.dmp

          Filesize

          136KB

        • memory/4696-143-0x0000000004F10000-0x0000000005538000-memory.dmp

          Filesize

          6.2MB

        • memory/4696-142-0x0000000002490000-0x00000000024A0000-memory.dmp

          Filesize

          64KB

        • memory/4696-141-0x0000000002490000-0x00000000024A0000-memory.dmp

          Filesize

          64KB

        • memory/4696-140-0x00000000048A0000-0x00000000048D6000-memory.dmp

          Filesize

          216KB