Analysis

  • max time kernel
    475s
  • max time network
    978s
  • platform
    windows7_x64
  • resource
    win7-20240708-en
  • resource tags

    arch:x64arch:x86image:win7-20240708-enlocale:en-usos:windows7-x64system
  • submitted
    31-08-2024 18:35

General

  • Target

    Krampus/b5uEJHZB6Rl.exe

  • Size

    231KB

  • MD5

    438289fb9c72ed39bf5497f9af21ec7a

  • SHA1

    8120391ecb41ed6a4c6ef0b259776e59311d6997

  • SHA256

    ea4cb7c7b4cfb2fcc04d1c3f96b20c26638e69a97b15cae14659f0d6afb78f85

  • SHA512

    3647907fa2d503a242ef07cb20b081444b75e0c618a91232c8e77903b4b6aa823b8a7cbe07a45e02591fe48fdd23b5eae88565006b85863c0a5f6e42d7589fe0

  • SSDEEP

    6144:YloZM+rIkd8g+EtXHkv/iD4Bs4DdLocD/abtIEx6tb8e1mTiu:GoZtL+EP8Bs4DdLocD/abtIExq1

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

    Using powershell.exe command.

  • Drops file in Drivers directory 1 IoCs
  • Deletes itself 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 2 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.

  • System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 2 IoCs

    Adversaries may check for Internet connectivity on compromised systems.

  • Detects videocard installed 1 TTPs 1 IoCs

    Uses WMIC.exe to determine videocard installed.

  • Enumerates system info in registry 2 TTPs 3 IoCs
  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 10 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of FindShellTrayWindow 34 IoCs
  • Suspicious use of SendNotifyMessage 32 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs
  • Views/modifies file attributes 1 TTPs 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Krampus\b5uEJHZB6Rl.exe
    "C:\Users\Admin\AppData\Local\Temp\Krampus\b5uEJHZB6Rl.exe"
    1⤵
    • Drops file in Drivers directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2312
    • C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" csproduct get uuid
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:2472
    • C:\Windows\system32\attrib.exe
      "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\Krampus\b5uEJHZB6Rl.exe"
      2⤵
      • Views/modifies file attributes
      PID:2740
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\Krampus\b5uEJHZB6Rl.exe'
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:2828
    • 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:3016
    • 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:1616
    • 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:2252
    • C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" os get Caption
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:2112
    • C:\Windows\System32\Wbem\wmic.exe
      "wmic.exe" computersystem get totalphysicalmemory
      2⤵
        PID:1964
      • C:\Windows\System32\Wbem\wmic.exe
        "wmic.exe" csproduct get uuid
        2⤵
          PID:3000
        • 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:848
        • C:\Windows\System32\Wbem\wmic.exe
          "wmic" path win32_VideoController get name
          2⤵
          • Detects videocard installed
          PID:2956
        • C:\Windows\system32\cmd.exe
          "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\Krampus\b5uEJHZB6Rl.exe" && pause
          2⤵
          • Deletes itself
          • System Network Configuration Discovery: Internet Connection Discovery
          • Suspicious use of WriteProcessMemory
          PID:2240
          • C:\Windows\system32\PING.EXE
            ping localhost
            3⤵
            • System Network Configuration Discovery: Internet Connection Discovery
            • Runs ping.exe
            PID:2288
      • 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 use of FindShellTrayWindow
        • Suspicious use of SendNotifyMessage
        • Suspicious use of WriteProcessMemory
        PID:2068
        • 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:7 --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=106.0.5249.119 --initial-client-data=0xc0,0xc4,0xc8,0x94,0xcc,0x7fef6799758,0x7fef6799768,0x7fef6799778
          2⤵
            PID:2428
          • C:\Program Files\Google\Chrome\Application\chrome.exe
            "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=gpu-process --gpu-preferences=UAAAAAAAAADgAAAYAAAAAAAAAAAAAAAAAABgAAAAAAAwAAAAAAAAAAAAAAAQAAAAAAAAAAAAAAAAAAAAAAAAAEgAAAAAAAAASAAAAAAAAAAYAAAAAgAAABAAAAAAAAAAGAAAAAAAAAAQAAAAAAAAAAAAAAAOAAAAEAAAAAAAAAABAAAADgAAAAgAAAAAAAAACAAAAAAAAAA= --mojo-platform-channel-handle=1132 --field-trial-handle=1204,i,5321974818555736245,12521196049366378499,131072 /prefetch:2
            2⤵
              PID:1140
            • 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 --mojo-platform-channel-handle=1532 --field-trial-handle=1204,i,5321974818555736245,12521196049366378499,131072 /prefetch:8
              2⤵
                PID:1956
              • 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=utility --mojo-platform-channel-handle=1616 --field-trial-handle=1204,i,5321974818555736245,12521196049366378499,131072 /prefetch:8
                2⤵
                  PID:1612
                • C:\Program Files\Google\Chrome\Application\chrome.exe
                  "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=renderer --display-capture-permissions-policy-allowed --first-renderer-process --lang=en-US --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=6 --mojo-platform-channel-handle=2296 --field-trial-handle=1204,i,5321974818555736245,12521196049366378499,131072 /prefetch:1
                  2⤵
                    PID:1712
                  • C:\Program Files\Google\Chrome\Application\chrome.exe
                    "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=renderer --display-capture-permissions-policy-allowed --lang=en-US --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=5 --mojo-platform-channel-handle=2304 --field-trial-handle=1204,i,5321974818555736245,12521196049366378499,131072 /prefetch:1
                    2⤵
                      PID:2256
                    • C:\Program Files\Google\Chrome\Application\chrome.exe
                      "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=gpu-process --gpu-preferences=UAAAAAAAAADgAAAYAAAAAAAAAAAAAAAAAABgAAAAAAAwAAAAAAAAAAAAAAAQAAAAAAAAAAAAAAAAAAAAAAAAAEgAAAAAAAAASAAAAAAAAAAYAAAAAgAAABAAAAAAAAAAGAAAAAAAAAAQAAAAAAAAAAAAAAAOAAAAEAAAAAAAAAABAAAADgAAAAgAAAAAAAAACAAAAAAAAAA= --use-gl=angle --use-angle=swiftshader-webgl --mojo-platform-channel-handle=1492 --field-trial-handle=1204,i,5321974818555736245,12521196049366378499,131072 /prefetch:2
                      2⤵
                        PID:3024
                      • C:\Program Files\Google\Chrome\Application\chrome.exe
                        "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=renderer --display-capture-permissions-policy-allowed --disable-gpu-compositing --lang=en-US --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=8 --mojo-platform-channel-handle=3288 --field-trial-handle=1204,i,5321974818555736245,12521196049366378499,131072 /prefetch:1
                        2⤵
                          PID:2292
                        • C:\Program Files\Google\Chrome\Application\chrome.exe
                          "C:\Program Files\Google\Chrome\Application\chrome.exe" --type=utility --utility-sub-type=chrome.mojom.UtilWin --lang=en-US --service-sandbox-type=none --mojo-platform-channel-handle=3876 --field-trial-handle=1204,i,5321974818555736245,12521196049366378499,131072 /prefetch:8
                          2⤵
                            PID:2948
                        • C:\Program Files\Google\Chrome\Application\106.0.5249.119\elevation_service.exe
                          "C:\Program Files\Google\Chrome\Application\106.0.5249.119\elevation_service.exe"
                          1⤵
                            PID:2348

                          Network

                          MITRE ATT&CK Enterprise v15

                          Replay Monitor

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                          Downloads

                          • C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\GPUCache\data_1

                            Filesize

                            264KB

                            MD5

                            f50f89a0a91564d0b8a211f8921aa7de

                            SHA1

                            112403a17dd69d5b9018b8cede023cb3b54eab7d

                            SHA256

                            b1e963d702392fb7224786e7d56d43973e9b9efd1b89c17814d7c558ffc0cdec

                            SHA512

                            bf8cda48cf1ec4e73f0dd1d4fa5562af1836120214edb74957430cd3e4a2783e801fa3f4ed2afb375257caeed4abe958265237d6e0aacf35a9ede7a2e8898d58

                          • C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Network\Network Persistent State

                            Filesize

                            829B

                            MD5

                            f60f3d6cabcc3100f0bc36750af1f82a

                            SHA1

                            2147380644b45d3b2f7c6e479a0c66804a23a47c

                            SHA256

                            346189b2ea0e44e881287b56f3d70aa9e26819bcc4c8bcd62992447af7b5e1db

                            SHA512

                            805ee80d86ada18653b91a2ee122d18c4b580a90729cde52112e96ee5b9276fb0e14a88e94ddc35f2f8dd09d75b035aef4e7fcf7147b79163b9de227521d7a4d

                          • C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Network\Network Persistent State

                            Filesize

                            633B

                            MD5

                            674f59a61bde785cb7cbb2d6478bf116

                            SHA1

                            9eab6f885016716a732475375c948a86c0f3987e

                            SHA256

                            6dba1f7e37cd89fbc30216220a2c11bb297c183be489594e505f38955a71a185

                            SHA512

                            c80e0042b8913e58e1a2c6b1b88cc0859edcff0b8c275f9b5b5939eb841292a8385b47320f0b5adff566a19039d0750cc1a0a971602a115427ebf01d04b2677e

                          • C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Preferences

                            Filesize

                            4KB

                            MD5

                            405e85061ade23fb182121e8ef0a81ab

                            SHA1

                            37af22e2527bfea0740b482efe83d11aec1c0d6d

                            SHA256

                            9c5f0fc07f9df5e20a07db40671223d216fc066bdbb29ee3db22947617cdcff8

                            SHA512

                            f498db7d926eba835f93d48a82f6609b7d3536892244b884d15c6141f4678652b774be5787faf09c15171b0e313f737327f6c5d850e0cb0a90c3211521889492

                          • C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Preferences

                            Filesize

                            4KB

                            MD5

                            f698297d62e734b0bba62c4597ed9764

                            SHA1

                            0167eaa0a4ac9daeecd143d9b9e29279bdc4450d

                            SHA256

                            920023c3ffa1ea4a3bd6a0cfd1934765afd9c4eb65e44d57eeec9aeab6d3c211

                            SHA512

                            77306c1abeba9108dd31d4dcbb624bdb8c582a4ecac84ec2f2f3a4a4bd588c9d109dd98d5002cfca73d0afd4a4bfb2cd08c5c572dcb2671d88724ebdac74de69

                          • C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Preferences

                            Filesize

                            4KB

                            MD5

                            c94af070df9cc38fe0db7488a3bac1ee

                            SHA1

                            a87bbceecfd4143ff2aef62a4051a3a8b59a8181

                            SHA256

                            3e9d4b32005b6b8047168e1077766a89618bf685677785cf0f4480a5c6b29a67

                            SHA512

                            bdcffa3ada0a0f0b9701e1170a1081784a5c9948839230beb578710b3078319b50512331ab931d06a44a0d370b0862eb7c6f90f92ab26cffa8fe86b626376e64

                          • C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Sync Data\LevelDB\000007.dbtmp

                            Filesize

                            16B

                            MD5

                            18e723571b00fb1694a3bad6c78e4054

                            SHA1

                            afcc0ef32d46fe59e0483f9a3c891d3034d12f32

                            SHA256

                            8af72f43857550b01eab1019335772b367a17a9884a7a759fdf4fe6f272b90aa

                            SHA512

                            43bb0af7d3984012d2d67ca6b71f0201e5b948e6fe26a899641c4c6f066c59906d468ddf7f1df5ea5fa33c2bc5ea8219c0f2c82e0a5c365ad7581b898a8859e2

                          • C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Local State

                            Filesize

                            321KB

                            MD5

                            d44250f0fca0505347792bdb10aff0b8

                            SHA1

                            44d33860e0b28a1fd5b68dc0241311eb21ca3860

                            SHA256

                            b65858dd3401a29a98f96319cfcfff31774ec1d18fed9eb623489d86a1f8130f

                            SHA512

                            2a5e3b3929af7206c8f301d7224d2ab23920c332413c21a3177e197857d86bd2167f8531abdcf00e6ed638f99a2f21196c75f9cf56b46f9111c7e321b6a73438

                          • C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms

                            Filesize

                            7KB

                            MD5

                            66a9ed2032f0e6769cd4f0104315e349

                            SHA1

                            a5610c3160c52e6610bcbb236c4994ccec7ea14b

                            SHA256

                            7880b6eda7e86bd779af13bd9af8f2be5c5cb1f85cc0f2f039038ccdc5d7774c

                            SHA512

                            86478a6a388c0c5c56e1f92a5423450d11b7d252840c6731abc0a885ab663e621486b4553a3ee938023fba5ecbc921e6044c8431813c92d8e4479ffaa2b7a2cd

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

                            Filesize

                            2KB

                            MD5

                            577f27e6d74bd8c5b7b0371f2b1e991c

                            SHA1

                            b334ccfe13792f82b698960cceaee2e690b85528

                            SHA256

                            0ade9ef91b5283eceb17614dd47eb450a5a2a371c410232552ad80af4fbfd5f9

                            SHA512

                            944b09b6b9d7c760b0c5add40efd9a25197c22e302c3c7e6d3f4837825ae9ee73e8438fc2c93e268da791f32deb70874799b8398ebae962a9fc51c980c7a5f5c

                          • memory/848-44-0x0000000002770000-0x0000000002778000-memory.dmp

                            Filesize

                            32KB

                          • memory/2312-48-0x000007FEF52B0000-0x000007FEF5C9C000-memory.dmp

                            Filesize

                            9.9MB

                          • memory/2312-0-0x000007FEF52B3000-0x000007FEF52B4000-memory.dmp

                            Filesize

                            4KB

                          • memory/2312-2-0x000007FEF52B0000-0x000007FEF5C9C000-memory.dmp

                            Filesize

                            9.9MB

                          • memory/2312-1-0x00000000002C0000-0x0000000000300000-memory.dmp

                            Filesize

                            256KB

                          • memory/2828-8-0x0000000001D10000-0x0000000001D18000-memory.dmp

                            Filesize

                            32KB

                          • memory/2828-7-0x000000001B710000-0x000000001B9F2000-memory.dmp

                            Filesize

                            2.9MB

                          • memory/3016-15-0x0000000001EF0000-0x0000000001EF8000-memory.dmp

                            Filesize

                            32KB

                          • memory/3016-14-0x000000001B6E0000-0x000000001B9C2000-memory.dmp

                            Filesize

                            2.9MB