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Analysis

  • max time kernel
    35s
  • max time network
    37s
  • 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, 06:26

General

  • Target

    service.exe

  • Size

    237KB

  • MD5

    ab439c03eb89bc15757588b7b030bea6

  • SHA1

    50411b04ba6c51aab0f706e3a54fc548b5f8df0f

  • SHA256

    be067c2c7c5a474442339d8adc999a0a288d56890d9781e88f536b6183cd398c

  • SHA512

    7784fb618db8f2951bd8032154da86c9f139d51a4e541c9924cfccab99862efbcf92b8cbd582714e5f243d2cd5ee1b9fa2bb076f7d9b683e4b57e7b9e347c9a7

  • SSDEEP

    3072:r4tWK9YMDbz6fV/NpbnyAGJwhOnQdT1MgvAOdj8MXoiTYfSHw69pJZXAqacHy1ly:m9j76xnImFZ1MmF8QTU/urSiLfTP8U

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/3Z9zi18j

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.

  • Delays execution with timeout.exe 1 IoCs
  • Modifies registry class 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 24 IoCs
  • Suspicious use of WriteProcessMemory 18 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:668
    • 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:724
      • 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:428
        • C:\Windows\SysWOW64\attrib.exe
          "C:\Windows\System32\attrib.exe" +s +h .\\tmp8DD7.exe
          4⤵
          • Sets file to hidden
          • Drops startup file
          • Views/modifies file attributes
          PID:1696
        • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\tmp8DD7.exe
          "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\tmp8DD7.exe"
          4⤵
          • Executes dropped EXE
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:3856
          • C:\Windows\SysWOW64\cmd.exe
            C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpE9A9.tmp.bat""
            5⤵
            • Suspicious use of WriteProcessMemory
            PID:1192
            • C:\Windows\SysWOW64\timeout.exe
              timeout 3
              6⤵
              • Delays execution with timeout.exe
              PID:3380

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

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

    Filesize

    147B

    MD5

    e04e55d2e6cc3d920631fdc5d6dcc1ce

    SHA1

    2c4dbcff71f8678623a7c197440ec281804dc5a5

    SHA256

    f641a99ec7e549970c81d724766f2a60ff031a5ec92aa6fc84228c82eeb4b4eb

    SHA512

    9511fe4dc599187f4539b8cda476550c54e86cbfcaca339a5db12e980ec322bf488d7458bf76089aa1d845f164f7ddb8adea017923d9a4930b9e821b7a4ae998

  • 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_tsiv3qho.ovd.ps1

    Filesize

    60B

    MD5

    d17fe0a3f47be24a6453e9ef58c94641

    SHA1

    6ab83620379fc69f80c0242105ddffd7d98d5d9d

    SHA256

    96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

    SHA512

    5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

  • C:\Users\Admin\AppData\Local\Temp\tmpE9A9.tmp.bat

    Filesize

    202B

    MD5

    201e036830c697de9ac921e60ebd057c

    SHA1

    51a5797aaf13d7917b65eea111485ecd2c424117

    SHA256

    b5c79d2bc353cad9ec20c3d79e66d2aed3c15ed20939a9b66c768449d20b1338

    SHA512

    265f0284448e8fd7b84e8622af241aba782a6a578db614217a5081422208e8b45b5d88baa64b033ede20c7e4e146a7b2e099dbe6217bcd08ca6bddbea676c587

  • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\tmp8DD7.exe

    Filesize

    48KB

    MD5

    6b95c5b02a8c31726cab09fc575423d5

    SHA1

    840aedd363c32d13cf8ec14729f68b9e6c31d374

    SHA256

    ec22734717b5451dd8527cf3d564fe450d2a12523e5ec880b9d8c60345f762b9

    SHA512

    f6eeb9d5b44617103d96662311db7e483d5c1b7be849d8e99a9d9284dce830d7fcedaf4247d3e45e1823d27ed8ea6df328596744b6ee2de98ccfee0f36f5fb40

  • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\tmp8DD7.exe

    Filesize

    48KB

    MD5

    6b95c5b02a8c31726cab09fc575423d5

    SHA1

    840aedd363c32d13cf8ec14729f68b9e6c31d374

    SHA256

    ec22734717b5451dd8527cf3d564fe450d2a12523e5ec880b9d8c60345f762b9

    SHA512

    f6eeb9d5b44617103d96662311db7e483d5c1b7be849d8e99a9d9284dce830d7fcedaf4247d3e45e1823d27ed8ea6df328596744b6ee2de98ccfee0f36f5fb40

  • memory/428-156-0x0000000006330000-0x000000000634E000-memory.dmp

    Filesize

    120KB

  • memory/428-177-0x000000007F670000-0x000000007F680000-memory.dmp

    Filesize

    64KB

  • memory/428-151-0x0000000004D40000-0x0000000004D50000-memory.dmp

    Filesize

    64KB

  • memory/428-144-0x0000000005D00000-0x0000000005D66000-memory.dmp

    Filesize

    408KB

  • memory/428-143-0x0000000005C90000-0x0000000005CF6000-memory.dmp

    Filesize

    408KB

  • memory/428-158-0x0000000004D40000-0x0000000004D50000-memory.dmp

    Filesize

    64KB

  • memory/428-159-0x0000000007550000-0x00000000075E6000-memory.dmp

    Filesize

    600KB

  • memory/428-160-0x0000000006870000-0x000000000688A000-memory.dmp

    Filesize

    104KB

  • memory/428-161-0x00000000068C0000-0x00000000068E2000-memory.dmp

    Filesize

    136KB

  • memory/428-162-0x0000000007BD0000-0x0000000008174000-memory.dmp

    Filesize

    5.6MB

  • memory/428-163-0x0000000008800000-0x0000000008E7A000-memory.dmp

    Filesize

    6.5MB

  • memory/428-164-0x0000000007670000-0x00000000076A2000-memory.dmp

    Filesize

    200KB

  • memory/428-165-0x000000006F490000-0x000000006F4DC000-memory.dmp

    Filesize

    304KB

  • memory/428-175-0x0000000008400000-0x000000000841E000-memory.dmp

    Filesize

    120KB

  • memory/428-176-0x0000000008520000-0x000000000852A000-memory.dmp

    Filesize

    40KB

  • memory/428-150-0x0000000004D40000-0x0000000004D50000-memory.dmp

    Filesize

    64KB

  • memory/428-178-0x00000000086A0000-0x00000000086AE000-memory.dmp

    Filesize

    56KB

  • memory/428-179-0x0000000008700000-0x000000000871A000-memory.dmp

    Filesize

    104KB

  • memory/428-180-0x00000000086F0000-0x00000000086F8000-memory.dmp

    Filesize

    32KB

  • memory/428-181-0x0000000004D40000-0x0000000004D50000-memory.dmp

    Filesize

    64KB

  • memory/428-182-0x0000000004D40000-0x0000000004D50000-memory.dmp

    Filesize

    64KB

  • memory/428-142-0x0000000005280000-0x00000000052A2000-memory.dmp

    Filesize

    136KB

  • memory/428-185-0x0000000004D40000-0x0000000004D50000-memory.dmp

    Filesize

    64KB

  • memory/428-141-0x0000000005400000-0x0000000005A28000-memory.dmp

    Filesize

    6.2MB

  • memory/428-140-0x0000000004D90000-0x0000000004DC6000-memory.dmp

    Filesize

    216KB

  • memory/3856-190-0x0000000005220000-0x0000000005230000-memory.dmp

    Filesize

    64KB

  • memory/3856-191-0x0000000005B60000-0x0000000005BFC000-memory.dmp

    Filesize

    624KB

  • memory/3856-192-0x0000000005220000-0x0000000005230000-memory.dmp

    Filesize

    64KB

  • memory/3856-193-0x0000000007020000-0x0000000007096000-memory.dmp

    Filesize

    472KB

  • memory/3856-194-0x0000000006FC0000-0x0000000006FDE000-memory.dmp

    Filesize

    120KB

  • memory/3856-195-0x0000000007170000-0x0000000007202000-memory.dmp

    Filesize

    584KB

  • memory/3856-187-0x0000000000910000-0x0000000000922000-memory.dmp

    Filesize

    72KB