Analysis

  • max time kernel
    89s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230221-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230221-enlocale:en-usos:windows10-2004-x64system
  • submitted
    15/03/2023, 02:31

General

  • Target

    Extreme Injector v3.exe

  • Size

    2.5MB

  • MD5

    db968aeb50c080c3a72229b1a8510120

  • SHA1

    97bab715884b15042bcc5b0b7cdfd99008768c73

  • SHA256

    c11e2996e5b8e13cfee2563d6b3feef431acb558f9925024304472142ab1bde7

  • SHA512

    acadb5c7048226069d696d47469bb4ad526f3ee7a85ef7e0c941bfc7d0497c6ca23d6fa9aae46280680ff2f0c2b6d9341acf462de32eb209f211d4c20fbface5

  • SSDEEP

    49152:uKUoU6fNT4krGHdiZoQ67UWqpjJXyZKB:TaAZIqpjR

Malware Config

Extracted

Language
ps1
Source
URLs
exe.dropper

https://pastebin.com/raw/vNcCt60A

Extracted

Family

asyncrat

Version

1.0.7

Botnet

Default

Mutex

Mutex

Attributes
  • delay

    3

  • install

    true

  • install_file

    csrss.exe

  • 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 5 IoCs
  • Blocklisted process makes network request 3 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 4 IoCs

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

  • Executes dropped EXE 3 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.

  • Creates scheduled task(s) 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Delays execution with timeout.exe 1 IoCs
  • Modifies registry class 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 25 IoCs
  • Suspicious use of AdjustPrivilegeToken 24 IoCs
  • Suspicious use of WriteProcessMemory 24 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.

  • Views/modifies file attributes 1 TTPs 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Extreme Injector v3.exe
    "C:\Users\Admin\AppData\Local\Temp\Extreme Injector v3.exe"
    1⤵
    • Checks computer location settings
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:4644
    • C:\Users\Admin\AppData\Local\Temp\service.exe
      "C:\Users\Admin\AppData\Local\Temp\service.exe"
      2⤵
      • Checks computer location settings
      • Executes dropped EXE
      • Modifies registry class
      • Suspicious use of WriteProcessMemory
      PID:3820
      • C:\Windows\SysWOW64\WScript.exe
        "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\RarSFX0\config.vbs"
        3⤵
        • Checks computer location settings
        • Suspicious use of WriteProcessMemory
        PID:3864
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Unrestricted -nologo -command .\service.ps1
          4⤵
          • Blocklisted process makes network request
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:4368
          • C:\Windows\SysWOW64\attrib.exe
            "C:\Windows\system32\attrib.exe" +s +h C:\Users\Admin\AppData\Local\Temp\tmp2DD2.exe
            5⤵
            • Sets file to hidden
            • Views/modifies file attributes
            PID:3180
          • C:\Users\Admin\AppData\Local\Temp\tmp2DD2.exe
            "C:\Users\Admin\AppData\Local\Temp\tmp2DD2.exe"
            5⤵
            • Checks computer location settings
            • Executes dropped EXE
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of WriteProcessMemory
            PID:4520
            • C:\Windows\System32\cmd.exe
              "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "csrss" /tr '"C:\Users\Admin\AppData\Roaming\csrss.exe"' & exit
              6⤵
              • Suspicious use of WriteProcessMemory
              PID:3744
              • C:\Windows\system32\schtasks.exe
                schtasks /create /f /sc onlogon /rl highest /tn "csrss" /tr '"C:\Users\Admin\AppData\Roaming\csrss.exe"'
                7⤵
                • Creates scheduled task(s)
                PID:2836
            • C:\Windows\system32\cmd.exe
              C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpCC9C.tmp.bat""
              6⤵
              • Suspicious use of WriteProcessMemory
              PID:3228
              • C:\Windows\system32\timeout.exe
                timeout 3
                7⤵
                • Delays execution with timeout.exe
                PID:4832
              • C:\Users\Admin\AppData\Roaming\csrss.exe
                "C:\Users\Admin\AppData\Roaming\csrss.exe"
                7⤵
                • Executes dropped EXE
                • Suspicious use of AdjustPrivilegeToken
                PID:1396

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

          797B

          MD5

          eb9c76ab230c2b8527d504429d7aca20

          SHA1

          ca4fc2fcb5023fa8398fc5a0c15e7ad23a61e8cb

          SHA256

          f985277690d6c85a064bc5d494d20d0774fb5017eaf7874685378c538bd49dbf

          SHA512

          f791797d8301242f2334767153ae7133193cee75538ce38b9d5fa5b60388428a8808c22eb08dd070f6f7e3ce556cf1f04883285eaa44ddf8aba1bd67886429c2

        • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ps1vcy1c.qq1.ps1

          Filesize

          60B

          MD5

          d17fe0a3f47be24a6453e9ef58c94641

          SHA1

          6ab83620379fc69f80c0242105ddffd7d98d5d9d

          SHA256

          96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

          SHA512

          5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

        • C:\Users\Admin\AppData\Local\Temp\service.exe

          Filesize

          283KB

          MD5

          cc9cbbfa9ccc9cefe75253c65ad22405

          SHA1

          f126e2c4431a9eacab858316eaf031fb5e7bc9f1

          SHA256

          4d19771fb289f892626b1b04c120f53d69492ec87df2bfd6809dd6fce8662c3c

          SHA512

          bbc779e3daf6d9dcf249ba59d99feb34a62fe7f381d74b608fcc8719806eef88a04491983623417c9560f2dfc4858f6e8ec12362cf93e57ca3a78e1984ba2e17

        • C:\Users\Admin\AppData\Local\Temp\service.exe

          Filesize

          283KB

          MD5

          cc9cbbfa9ccc9cefe75253c65ad22405

          SHA1

          f126e2c4431a9eacab858316eaf031fb5e7bc9f1

          SHA256

          4d19771fb289f892626b1b04c120f53d69492ec87df2bfd6809dd6fce8662c3c

          SHA512

          bbc779e3daf6d9dcf249ba59d99feb34a62fe7f381d74b608fcc8719806eef88a04491983623417c9560f2dfc4858f6e8ec12362cf93e57ca3a78e1984ba2e17

        • C:\Users\Admin\AppData\Local\Temp\service.exe

          Filesize

          283KB

          MD5

          cc9cbbfa9ccc9cefe75253c65ad22405

          SHA1

          f126e2c4431a9eacab858316eaf031fb5e7bc9f1

          SHA256

          4d19771fb289f892626b1b04c120f53d69492ec87df2bfd6809dd6fce8662c3c

          SHA512

          bbc779e3daf6d9dcf249ba59d99feb34a62fe7f381d74b608fcc8719806eef88a04491983623417c9560f2dfc4858f6e8ec12362cf93e57ca3a78e1984ba2e17

        • C:\Users\Admin\AppData\Local\Temp\tmp2DD2.exe

          Filesize

          63KB

          MD5

          d2053aeb9216c3040b40e67d72578669

          SHA1

          3a33aab579e13bac21c4966b4e2491cee400155f

          SHA256

          8bd23941838cd09c9e3aba327a8ab6e8d78f2d5325ec790ec30e2963420ab2df

          SHA512

          8baf916842fc62aa743ca62851130d9552da8c3edc90d8b468bd154454bc643bb9d6474301a5414bccdd381d743b0dcaccb9683f7571b9f06d216a3ee754518f

        • C:\Users\Admin\AppData\Local\Temp\tmp2DD2.exe

          Filesize

          63KB

          MD5

          d2053aeb9216c3040b40e67d72578669

          SHA1

          3a33aab579e13bac21c4966b4e2491cee400155f

          SHA256

          8bd23941838cd09c9e3aba327a8ab6e8d78f2d5325ec790ec30e2963420ab2df

          SHA512

          8baf916842fc62aa743ca62851130d9552da8c3edc90d8b468bd154454bc643bb9d6474301a5414bccdd381d743b0dcaccb9683f7571b9f06d216a3ee754518f

        • C:\Users\Admin\AppData\Local\Temp\tmpCC9C.tmp.bat

          Filesize

          149B

          MD5

          d2fcd0491a68ee4ce690b7cdb59a60da

          SHA1

          380a6e13d8502a2549112aae8a9ffa98fd744a0c

          SHA256

          d566498c3411c209aa4ae31587bd3038e987940489fa66d0edde474304b5f751

          SHA512

          3f6b42cbbbc6a52d917973a3756f7b23687ffe2b3c6f7c0a82cee494c6fa1f2e245bbfcabfece8846be8efdae10f4bd253ce02dc962f64ec9831bae2d4ce9b3b

        • C:\Users\Admin\AppData\Roaming\csrss.exe

          Filesize

          63KB

          MD5

          d2053aeb9216c3040b40e67d72578669

          SHA1

          3a33aab579e13bac21c4966b4e2491cee400155f

          SHA256

          8bd23941838cd09c9e3aba327a8ab6e8d78f2d5325ec790ec30e2963420ab2df

          SHA512

          8baf916842fc62aa743ca62851130d9552da8c3edc90d8b468bd154454bc643bb9d6474301a5414bccdd381d743b0dcaccb9683f7571b9f06d216a3ee754518f

        • C:\Users\Admin\AppData\Roaming\csrss.exe

          Filesize

          63KB

          MD5

          d2053aeb9216c3040b40e67d72578669

          SHA1

          3a33aab579e13bac21c4966b4e2491cee400155f

          SHA256

          8bd23941838cd09c9e3aba327a8ab6e8d78f2d5325ec790ec30e2963420ab2df

          SHA512

          8baf916842fc62aa743ca62851130d9552da8c3edc90d8b468bd154454bc643bb9d6474301a5414bccdd381d743b0dcaccb9683f7571b9f06d216a3ee754518f

        • memory/4368-195-0x0000000006E00000-0x0000000006E22000-memory.dmp

          Filesize

          136KB

        • memory/4368-178-0x0000000006110000-0x0000000006132000-memory.dmp

          Filesize

          136KB

        • memory/4368-190-0x00000000068B0000-0x00000000068CE000-memory.dmp

          Filesize

          120KB

        • memory/4368-179-0x00000000061B0000-0x0000000006216000-memory.dmp

          Filesize

          408KB

        • memory/4368-192-0x0000000002F60000-0x0000000002F70000-memory.dmp

          Filesize

          64KB

        • memory/4368-193-0x0000000007880000-0x0000000007916000-memory.dmp

          Filesize

          600KB

        • memory/4368-194-0x0000000006DB0000-0x0000000006DCA000-memory.dmp

          Filesize

          104KB

        • memory/4368-174-0x00000000052C0000-0x00000000052F6000-memory.dmp

          Filesize

          216KB

        • memory/4368-196-0x0000000007F20000-0x00000000084C4000-memory.dmp

          Filesize

          5.6MB

        • memory/4368-197-0x0000000008B50000-0x00000000091CA000-memory.dmp

          Filesize

          6.5MB

        • memory/4368-198-0x0000000007BC0000-0x0000000007BF2000-memory.dmp

          Filesize

          200KB

        • memory/4368-199-0x000000006F5A0000-0x000000006F5EC000-memory.dmp

          Filesize

          304KB

        • memory/4368-209-0x0000000008940000-0x000000000895E000-memory.dmp

          Filesize

          120KB

        • memory/4368-210-0x0000000008A70000-0x0000000008A7A000-memory.dmp

          Filesize

          40KB

        • memory/4368-211-0x0000000002F60000-0x0000000002F70000-memory.dmp

          Filesize

          64KB

        • memory/4368-212-0x0000000002F60000-0x0000000002F70000-memory.dmp

          Filesize

          64KB

        • memory/4368-213-0x0000000008B30000-0x0000000008B3E000-memory.dmp

          Filesize

          56KB

        • memory/4368-214-0x0000000009350000-0x000000000936A000-memory.dmp

          Filesize

          104KB

        • memory/4368-215-0x0000000009330000-0x0000000009338000-memory.dmp

          Filesize

          32KB

        • memory/4368-185-0x0000000006290000-0x00000000062F6000-memory.dmp

          Filesize

          408KB

        • memory/4368-218-0x0000000002F60000-0x0000000002F70000-memory.dmp

          Filesize

          64KB

        • memory/4368-177-0x0000000002F60000-0x0000000002F70000-memory.dmp

          Filesize

          64KB

        • memory/4368-175-0x0000000005930000-0x0000000005F58000-memory.dmp

          Filesize

          6.2MB

        • memory/4368-176-0x0000000002F60000-0x0000000002F70000-memory.dmp

          Filesize

          64KB

        • memory/4520-223-0x000000001C660000-0x000000001C670000-memory.dmp

          Filesize

          64KB

        • memory/4520-221-0x00000000003B0000-0x00000000003C6000-memory.dmp

          Filesize

          88KB

        • memory/4644-133-0x0000000000400000-0x000000000068C000-memory.dmp

          Filesize

          2.5MB