Analysis

  • max time kernel
    21s
  • max time network
    24s
  • platform
    windows11-21h2_x64
  • resource
    win11-20241007-en
  • resource tags

    arch:x64arch:x86image:win11-20241007-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    28-11-2024 16:17

General

  • Target

    1YMSykc.exe

  • Size

    1.3MB

  • MD5

    47daa94b04ff038ade5342c9de2d93e7

  • SHA1

    e8918b3c526002213b94b5d497d63d2b98f6c354

  • SHA256

    7d75b643c71063ea63b7cf241bf138c5546ac59399456776938ae1dee6dcfd0a

  • SHA512

    abbfb1417edfde19694759d63ae175192ce180e937b443e4b485c32eee22389f319a618f9883934a6f878fd5d6530ab7b1f6058f616e79906f6adb8bb9115bf2

  • SSDEEP

    24576:xuDXTIGaPhEYzUzA0nOLYuVuoWIT/ntnA0zggkJboApVzHLEQrdCNYffzHLS:kDjlabwz9OLYdm9zItRnzzG4fzu

Malware Config

Signatures

  • Detect Umbral payload 4 IoCs
  • Umbral

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

  • Umbral family
  • Command and Scripting Interpreter: PowerShell 1 TTPs 8 IoCs

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

  • Drops file in Drivers directory 2 IoCs
  • Executes dropped EXE 2 IoCs
  • Reads user/profile data of web browsers 3 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.

  • Enumerates physical storage devices 1 TTPs

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

  • System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 4 IoCs

    Adversaries may check for Internet connectivity on compromised systems.

  • Detects videocard installed 1 TTPs 2 IoCs

    Uses WMIC.exe to determine videocard installed.

  • Runs ping.exe 1 TTPs 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 22 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 56 IoCs
  • Views/modifies file attributes 1 TTPs 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\1YMSykc.exe
    "C:\Users\Admin\AppData\Local\Temp\1YMSykc.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2752
    • C:\Users\Admin\AppData\Local\Temp\RarSFX0\Cc.exe
      "C:\Users\Admin\AppData\Local\Temp\RarSFX0\Cc.exe"
      2⤵
      • Drops file in Drivers directory
      • Executes dropped EXE
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:4960
      • C:\Windows\System32\Wbem\wmic.exe
        "wmic.exe" csproduct get uuid
        3⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:1700
      • C:\Windows\SYSTEM32\attrib.exe
        "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\RarSFX0\Cc.exe"
        3⤵
        • Views/modifies file attributes
        PID:2732
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\RarSFX0\Cc.exe'
        3⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:1852
      • 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
        3⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:1284
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell.exe" Get-ItemPropertyValue -Path HKCU:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
        3⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:4564
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell.exe" Get-ItemPropertyValue -Path HKLN:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:828
      • C:\Windows\System32\Wbem\wmic.exe
        "wmic.exe" os get Caption
        3⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:4996
      • C:\Windows\System32\Wbem\wmic.exe
        "wmic.exe" computersystem get totalphysicalmemory
        3⤵
          PID:3128
        • C:\Windows\System32\Wbem\wmic.exe
          "wmic.exe" csproduct get uuid
          3⤵
            PID:760
          • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
            "powershell.exe" Get-ItemPropertyValue -Path 'HKLM:System\CurrentControlSet\Control\Session Manager\Environment' -Name PROCESSOR_IDENTIFIER
            3⤵
            • Command and Scripting Interpreter: PowerShell
            • Suspicious behavior: EnumeratesProcesses
            PID:4720
          • C:\Windows\System32\Wbem\wmic.exe
            "wmic" path win32_VideoController get name
            3⤵
            • Detects videocard installed
            PID:4052
          • C:\Windows\SYSTEM32\cmd.exe
            "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\RarSFX0\Cc.exe" && pause
            3⤵
            • System Network Configuration Discovery: Internet Connection Discovery
            • Suspicious use of WriteProcessMemory
            PID:3492
            • C:\Windows\system32\PING.EXE
              ping localhost
              4⤵
              • System Network Configuration Discovery: Internet Connection Discovery
              • Runs ping.exe
              PID:452
        • C:\Users\Admin\AppData\Local\Temp\RarSFX0\CcC.exe
          "C:\Users\Admin\AppData\Local\Temp\RarSFX0\CcC.exe"
          2⤵
          • Drops file in Drivers directory
          • Executes dropped EXE
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:2280
          • C:\Windows\System32\Wbem\wmic.exe
            "wmic.exe" csproduct get uuid
            3⤵
              PID:1080
            • C:\Windows\SYSTEM32\attrib.exe
              "attrib.exe" +h +s "C:\Users\Admin\AppData\Local\Temp\RarSFX0\CcC.exe"
              3⤵
              • Views/modifies file attributes
              PID:3264
            • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
              "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\RarSFX0\CcC.exe'
              3⤵
              • Command and Scripting Interpreter: PowerShell
              • Suspicious behavior: EnumeratesProcesses
              PID:4300
            • 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
              3⤵
              • Command and Scripting Interpreter: PowerShell
              • Suspicious behavior: EnumeratesProcesses
              PID:1328
            • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
              "powershell.exe" Get-ItemPropertyValue -Path HKCU:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
              3⤵
              • Command and Scripting Interpreter: PowerShell
              • Suspicious behavior: EnumeratesProcesses
              PID:2204
            • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
              "powershell.exe" Get-ItemPropertyValue -Path HKLN:SOFTWARE\Roblox\RobloxStudioBrowser\roblox.com -Name .ROBLOSECURITY
              3⤵
              • Suspicious behavior: EnumeratesProcesses
              PID:2888
            • C:\Windows\System32\Wbem\wmic.exe
              "wmic.exe" os get Caption
              3⤵
                PID:992
              • C:\Windows\System32\Wbem\wmic.exe
                "wmic.exe" computersystem get totalphysicalmemory
                3⤵
                  PID:3844
                • C:\Windows\System32\Wbem\wmic.exe
                  "wmic.exe" csproduct get uuid
                  3⤵
                    PID:3296
                  • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
                    "powershell.exe" Get-ItemPropertyValue -Path 'HKLM:System\CurrentControlSet\Control\Session Manager\Environment' -Name PROCESSOR_IDENTIFIER
                    3⤵
                    • Command and Scripting Interpreter: PowerShell
                    • Suspicious behavior: EnumeratesProcesses
                    PID:2068
                  • C:\Windows\System32\Wbem\wmic.exe
                    "wmic" path win32_VideoController get name
                    3⤵
                    • Detects videocard installed
                    PID:4376
                  • C:\Windows\SYSTEM32\cmd.exe
                    "cmd.exe" /c ping localhost && del /F /A h "C:\Users\Admin\AppData\Local\Temp\RarSFX0\CcC.exe" && pause
                    3⤵
                    • System Network Configuration Discovery: Internet Connection Discovery
                    • Suspicious use of WriteProcessMemory
                    PID:3704
                    • C:\Windows\system32\PING.EXE
                      ping localhost
                      4⤵
                      • System Network Configuration Discovery: Internet Connection Discovery
                      • Runs ping.exe
                      PID:3060

              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

                5ba388a6597d5e09191c2c88d2fdf598

                SHA1

                13516f8ec5a99298f6952438055c39330feae5d8

                SHA256

                e6b6223094e8fc598ad12b3849e49f03a141ccd21e0eaa336f81791ad8443eca

                SHA512

                ead2a2b5a1c2fad70c1cf570b2c9bfcb7364dd9f257a834eb819e55b8fee78e3f191f93044f07d51c259ca77a90ee8530f9204cbae080fba1d5705e1209f5b19

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

                Filesize

                64B

                MD5

                1d85924575c6026dabbc76a0a5d74ed0

                SHA1

                c2aa47a5511ab7275cef48276b97a2ff4f5a4629

                SHA256

                8b7b7e261998d474b4a8be8a6d45fdc3077272cebb48486e51d296ee72467b7b

                SHA512

                134e22cf290e0bade79aa24a19f5d47899cd2eecb5011f3a91969222d32ce5f9e6c1238ce8e70cfabf2db0bb06ab1e04945c837c8b84aec128a5e43b4dbc958a

              • 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

                e7bffbf82d0bc5124e1bfb2748dbc2df

                SHA1

                4810e4cb40c9aee1b43dd5f4292ad02743228b63

                SHA256

                98d65b9f634bc6db4c7eb79ef3b0efa0b42edaf4fd686ef6cb295c35a557467d

                SHA512

                7f61dd4c23a6c41ca4a97bcf83bb342654a63f61dac42ffdb802bdc0c6ac84efc21819ca6533bb7717b3162c810536f489af5ed985331125ebda6f0cf3db5126

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

                Filesize

                1KB

                MD5

                991e8f3bdc04acca98024f7311752070

                SHA1

                76005ee90a2772414bc7231d6192a942dde9d499

                SHA256

                788799ff1be9e0abccbadc1d574ed7f36e7bc6833d942b5c177ed4e50c6dae44

                SHA512

                b7ecfcc910ecf00694e1b65ff4aa34caeb8f05db2aa10ca032885d1262efe74dee874abaa1399297144259f3ce2a7e48301c79477c51c5369c5911742c4fc326

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

                Filesize

                944B

                MD5

                979db644c2cade95abc261f491bf3b6c

                SHA1

                251e5cde0a34f14694f95c681dc7cfe63bd60844

                SHA256

                3781dd13cdbb9b2639aafb7e49da7e37ef6e3bb03151240764819a46b7a13cb9

                SHA512

                7114c56e51c5212d951093d72c98ef7a31055693b1de7b1709347c4af27ed5eadf758e1b0d0faafdbf54252da2ddba571118d9f11dd9bf480bd7fe17e71c5464

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

                Filesize

                948B

                MD5

                9e189a46e645ff30b93ea3d4c1386a39

                SHA1

                16b4fe116d8d76414cc68c929524020739e8ad87

                SHA256

                a0f052db1cd54d1a2e1c6c140063d65cb9793ed59865147275d2a1ee10166076

                SHA512

                306992440bbd1b934d07d3547372a0890b6e2f87308e5a4ac3e8c4c43abcd4cb7826508cf6a61bc2f167af6e311906485dda490808558a2cd4c72a6676c00994

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

                Filesize

                1KB

                MD5

                7332074ae2b01262736b6fbd9e100dac

                SHA1

                22f992165065107cc9417fa4117240d84414a13c

                SHA256

                baea84fda6c1f13090b8cbd91c920848946f10ce155ef31a1df4cd453ee7e4aa

                SHA512

                4ae6f0e012c31ac1fc2ff4a8877ce2b4667c45b6e651de798318a39a2b6fd39a6f72dffa8b0b89b7a045a27d724d195656faa25a9fec79b22f37ddebb5d22da2

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

                Filesize

                1KB

                MD5

                c321dfee531730b7e0b81470b947da3f

                SHA1

                0488401f4fc03bcdab19eeff194ff12f4439e1cb

                SHA256

                6d7da148fe930cf085b5369427eb24e66844d7f00fcc197f056e0763c7a76117

                SHA512

                eee78a9529b1d89631ac8dbaef716eba95166d8c465a2c075bf89d28fab4c25a48c4d29d7f19ab0249b245bf45fac63214b092aaef9b3a09b4f8e6cfa85a076a

              • C:\Users\Admin\AppData\Local\Temp\RarSFX0\Cc.exe

                Filesize

                492KB

                MD5

                4e6a63942f5205cc84a200ebc4aebc2e

                SHA1

                19ff74550c41a562e1b2b9cbe3c67608f685aefc

                SHA256

                fef58748adf375c23f2604f9c422f353a7fc969ca32bab8bf965b2648bf178d4

                SHA512

                34eb34a4358cfdf19563616659915ef0a895cbf1d37181fa4c003c1d904744c0ce664f56a287b2f2eb631e0f73af90e08b252d4bd090fe5054ed14890c251729

              • C:\Users\Admin\AppData\Local\Temp\RarSFX0\CcC.exe

                Filesize

                492KB

                MD5

                9e1d91acd2ee7f84fdb7374b66b28cf9

                SHA1

                36701c1a18a9fafe10e3d8fa2318453d7d193d5f

                SHA256

                fe47fabeb2de30c850fda2ee6f5af68de6197e84f748d2d81855db4a27755703

                SHA512

                eaf5e72e466dd31083156ad71f73bfa474219c2b4a753ec2ef1f7514ac3706a8d20018d07432a9ef68779300b8f13378a767625d8ea8722a1dab12ba91c0514a

              • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_z1h5g5er.tfg.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/1852-27-0x0000022E5EB80000-0x0000022E5EBA2000-memory.dmp

                Filesize

                136KB

              • memory/2280-111-0x0000023DDFD90000-0x0000023DDFE12000-memory.dmp

                Filesize

                520KB

              • memory/4960-100-0x00007FFC080E0000-0x00007FFC08BA2000-memory.dmp

                Filesize

                10.8MB

              • memory/4960-43-0x0000022A4B910000-0x0000022A4B986000-memory.dmp

                Filesize

                472KB

              • memory/4960-81-0x0000022A4B8B0000-0x0000022A4B8C2000-memory.dmp

                Filesize

                72KB

              • memory/4960-80-0x0000022A32F20000-0x0000022A32F2A000-memory.dmp

                Filesize

                40KB

              • memory/4960-45-0x0000022A32F40000-0x0000022A32F5E000-memory.dmp

                Filesize

                120KB

              • memory/4960-18-0x00007FFC080E0000-0x00007FFC08BA2000-memory.dmp

                Filesize

                10.8MB

              • memory/4960-44-0x0000022A4B990000-0x0000022A4B9E0000-memory.dmp

                Filesize

                320KB

              • memory/4960-16-0x00007FFC080E3000-0x00007FFC080E5000-memory.dmp

                Filesize

                8KB

              • memory/4960-17-0x0000022A31090000-0x0000022A31112000-memory.dmp

                Filesize

                520KB