Analysis

  • max time kernel
    153s
  • max time network
    171s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    27-02-2024 19:00

General

  • Target

    TikToKBuilder.exe

  • Size

    168.6MB

  • MD5

    c7c4ace6b0b14a749e4bce6ae94e45dc

  • SHA1

    5c02505f7ea90448c43b831e2eee34fcacefef95

  • SHA256

    06a1954a32e5a6823454c8b70a43dafcc44c9dec5c31f9d72a0774f0326dadcf

  • SHA512

    05e405eeea47b7ad513a3098aacf3b2cb3a0fbc7734630255023de601536305b9f7e98ec1ab780eba7110d6f3b7573186d2f1180617d2564a13f04382e66b025

  • SSDEEP

    1572864:KXic4qb6IXgDaJfpEQHgelkLK4z34xGWw0TwW1T/qWhehZvmCtS3JPfyzG49FndX:UVKvWZ8tyx4u

Malware Config

Signatures

  • Epsilon Stealer

    Information stealer.

  • Checks computer location settings 2 TTPs 2 IoCs

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

  • Loads dropped DLL 2 IoCs
  • Reads user/profile data of web browsers 2 TTPs

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

  • Adds Run key to start application 2 TTPs 1 IoCs
  • Looks up external IP address via web service 2 IoCs

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

  • Drops file in System32 directory 2 IoCs
  • Detects videocard installed 1 TTPs 1 IoCs

    Uses WMIC.exe to determine videocard installed.

  • Enumerates processes with tasklist 1 TTPs 1 IoCs
  • Kills process with taskkill 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\TikToKBuilder.exe
    "C:\Users\Admin\AppData\Local\Temp\TikToKBuilder.exe"
    1⤵
    • Checks computer location settings
    • Loads dropped DLL
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of WriteProcessMemory
    PID:4320
    • C:\Users\Admin\AppData\Local\Temp\TikToKBuilder.exe
      "C:\Users\Admin\AppData\Local\Temp\TikToKBuilder.exe" --type=gpu-process --user-data-dir="C:\Users\Admin\AppData\Roaming\TikToKBuilder" --gpu-preferences=WAAAAAAAAADgAAAMAAAAAAAAAAAAAAAAAABgAAAAAAA4AAAAAAAAAAAAAAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGAAAAAAAAAAYAAAAAAAAAAgAAAAAAAAACAAAAAAAAAAIAAAAAAAAAA== --mojo-platform-channel-handle=1860 --field-trial-handle=1864,i,4427549045156727355,7279726892218540689,262144 --enable-features=kWebSQLAccess --disable-features=SpareRendererForSitePerProcess,WinDelaySpellcheckServiceInit,WinRetrieveSuggestionsOnlyOnDemand --variations-seed-version /prefetch:2
      2⤵
        PID:4704
      • C:\Users\Admin\AppData\Local\Temp\TikToKBuilder.exe
        "C:\Users\Admin\AppData\Local\Temp\TikToKBuilder.exe" --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --user-data-dir="C:\Users\Admin\AppData\Roaming\TikToKBuilder" --mojo-platform-channel-handle=1972 --field-trial-handle=1864,i,4427549045156727355,7279726892218540689,262144 --enable-features=kWebSQLAccess --disable-features=SpareRendererForSitePerProcess,WinDelaySpellcheckServiceInit,WinRetrieveSuggestionsOnlyOnDemand --variations-seed-version /prefetch:8
        2⤵
          PID:3332
        • C:\Users\Admin\AppData\Local\Temp\TikToKBuilder.exe
          "C:\Users\Admin\AppData\Local\Temp\TikToKBuilder.exe" --type=renderer --user-data-dir="C:\Users\Admin\AppData\Roaming\TikToKBuilder" --app-path="C:\Users\Admin\AppData\Local\Temp\resources\app.asar" --enable-sandbox --first-renderer-process --lang=en-US --device-scale-factor=1 --num-raster-threads=4 --enable-main-frame-before-activation --renderer-client-id=4 --mojo-platform-channel-handle=2640 --field-trial-handle=1864,i,4427549045156727355,7279726892218540689,262144 --enable-features=kWebSQLAccess --disable-features=SpareRendererForSitePerProcess,WinDelaySpellcheckServiceInit,WinRetrieveSuggestionsOnlyOnDemand --variations-seed-version /prefetch:1
          2⤵
          • Checks computer location settings
          PID:3588
        • C:\Windows\system32\cmd.exe
          C:\Windows\system32\cmd.exe /d /s /c "wmic /Node:localhost /Namespace:\\root\SecurityCenter2 Path AntiVirusProduct Get displayName /Format:List"
          2⤵
            PID:2680
            • C:\Windows\System32\Wbem\WMIC.exe
              wmic /Node:localhost /Namespace:\\root\SecurityCenter2 Path AntiVirusProduct Get displayName /Format:List
              3⤵
              • Suspicious use of AdjustPrivilegeToken
              PID:4648
          • C:\Windows\system32\cmd.exe
            C:\Windows\system32\cmd.exe /d /s /c "C:\Windows\system32\reg.exe QUERY "HKCU\Software\Valve\Steam" /v SteamPath"
            2⤵
              PID:3684
              • C:\Windows\system32\reg.exe
                C:\Windows\system32\reg.exe QUERY "HKCU\Software\Valve\Steam" /v SteamPath
                3⤵
                  PID:1768
              • C:\Windows\system32\cmd.exe
                C:\Windows\system32\cmd.exe /d /s /c "C:\Windows\system32\reg.exe QUERY "HKCU\SOFTWARE\Martin Prikryl\WinSCP 2\Sessions""
                2⤵
                  PID:3148
                  • C:\Windows\system32\reg.exe
                    C:\Windows\system32\reg.exe QUERY "HKCU\SOFTWARE\Martin Prikryl\WinSCP 2\Sessions"
                    3⤵
                      PID:3192
                  • C:\Windows\system32\cmd.exe
                    C:\Windows\system32\cmd.exe /d /s /c "wmic path win32_VideoController get name"
                    2⤵
                      PID:1140
                      • C:\Windows\System32\Wbem\WMIC.exe
                        wmic path win32_VideoController get name
                        3⤵
                        • Detects videocard installed
                        • Suspicious use of AdjustPrivilegeToken
                        PID:1608
                    • C:\Windows\system32\cmd.exe
                      C:\Windows\system32\cmd.exe /d /s /c "cmd /c chcp 65001>nul && netsh wlan show profiles"
                      2⤵
                        PID:232
                        • C:\Windows\system32\cmd.exe
                          cmd /c chcp 65001
                          3⤵
                            PID:4316
                            • C:\Windows\system32\chcp.com
                              chcp 65001
                              4⤵
                                PID:1512
                            • C:\Windows\system32\netsh.exe
                              netsh wlan show profiles
                              3⤵
                                PID:3196
                            • C:\Windows\system32\cmd.exe
                              C:\Windows\system32\cmd.exe /d /s /c "taskkill /IM chrome.exe /F"
                              2⤵
                                PID:4432
                                • C:\Windows\system32\taskkill.exe
                                  taskkill /IM chrome.exe /F
                                  3⤵
                                  • Kills process with taskkill
                                  PID:4720
                              • C:\Windows\system32\cmd.exe
                                C:\Windows\system32\cmd.exe /d /s /c "C:\Windows\system32\reg.exe ADD "HKCU\Software\Microsoft\Windows\CurrentVersion\Run" /v WindowsBootManager /t REG_SZ /d C:\Users\Admin\AppData\Local\Microsoft\Windows\0\WindowsBootManager.exe /f"
                                2⤵
                                  PID:2784
                                  • C:\Windows\system32\reg.exe
                                    C:\Windows\system32\reg.exe ADD "HKCU\Software\Microsoft\Windows\CurrentVersion\Run" /v WindowsBootManager /t REG_SZ /d C:\Users\Admin\AppData\Local\Microsoft\Windows\0\WindowsBootManager.exe /f
                                    3⤵
                                    • Adds Run key to start application
                                    PID:2896
                                • C:\Windows\system32\cmd.exe
                                  C:\Windows\system32\cmd.exe /d /s /c "tasklist"
                                  2⤵
                                    PID:3456
                                    • C:\Windows\system32\tasklist.exe
                                      tasklist
                                      3⤵
                                      • Enumerates processes with tasklist
                                      PID:3452
                                  • C:\Users\Admin\AppData\Local\Temp\TikToKBuilder.exe
                                    "C:\Users\Admin\AppData\Local\Temp\TikToKBuilder.exe" --type=gpu-process --disable-gpu-sandbox --use-gl=disabled --gpu-vendor-id=4318 --gpu-device-id=140 --gpu-sub-system-id=0 --gpu-revision=0 --gpu-driver-version=10.0.19041.546 --user-data-dir="C:\Users\Admin\AppData\Roaming\TikToKBuilder" --gpu-preferences=WAAAAAAAAADoAAAMAAAAAAAAAAAAAAAAAABgAAAAAAA4AAAAAAAAAAAAAACEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAGAAAAAAAAAAYAAAAAAAAAAgAAAAAAAAACAAAAAAAAAAIAAAAAAAAAA== --mojo-platform-channel-handle=3612 --field-trial-handle=1864,i,4427549045156727355,7279726892218540689,262144 --enable-features=kWebSQLAccess --disable-features=SpareRendererForSitePerProcess,WinDelaySpellcheckServiceInit,WinRetrieveSuggestionsOnlyOnDemand --variations-seed-version /prefetch:8
                                    2⤵
                                    • Drops file in System32 directory
                                    • Suspicious behavior: EnumeratesProcesses
                                    PID:2016

                                Network

                                MITRE ATT&CK Enterprise v15

                                Replay Monitor

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                                Downloads

                                • C:\Users\Admin\AppData\Local\Temp\5d355a5e-b972-46ad-8a6a-937d54e5c3c5.tmp.node

                                  Filesize

                                  1.6MB

                                  MD5

                                  bc3285978427f0121ff25a2bc45a9c04

                                  SHA1

                                  8e33c8673c2d55697dbaeb5eec0419bece8967a1

                                  SHA256

                                  0135692978c34ca3ff4ecc40f71516df66ad54bb3acf38dc144f87af15fc8744

                                  SHA512

                                  ac9e46a032281048b851965dd445ad3cebf04dd028234bfa9d34b6eca795cf065d9ad50d13453cf3dc057e6561868f47c4c7a5a9913a7461a21c456d2de3d943

                                • C:\Users\Admin\AppData\Local\Temp\6e7f7b4f-5f5f-4800-bb4a-fd95f9e0294d.tmp.node

                                  Filesize

                                  122KB

                                  MD5

                                  185918fbbf35a18cc15e01a76a221534

                                  SHA1

                                  f7c63ef63b3672fabbcb783571373b3cc52d3f0b

                                  SHA256

                                  278b1f0acbd3d4c6dbfb02eeb1021fd937376739a8c6067b63e38ce89c7d4427

                                  SHA512

                                  7d7358184ba24eda51255c797cd3947a72e03ccc1dc2a6991d64774732a7f134e415750150700e689fd4f69ffc4991cc6a9f196a60499958cbb6dc8b0bb0da9b

                                • C:\Users\Admin\AppData\Local\Temp\epsilon-Admin\AutoFill Data\All Autofill Data.txt

                                  Filesize

                                  249B

                                  MD5

                                  cf7e4a12f932a3fddddacc8b10e1f1b0

                                  SHA1

                                  db6f9bc2be5e0905086b7b7b07109ef8d67b24ee

                                  SHA256

                                  1b6d3f6ad849e115bf20175985bed9bcfc6ec206e288b97ac14c3a23b5d28a4b

                                  SHA512

                                  fab79f26c1841310cc61e2f8336ca05281a9252a34a3c240e500c8775840374edb0a42094c64aa38a29ca79e1cafa114d6f1bbe3009060d32f8c1df9f088c12c

                                • C:\Users\Admin\AppData\Local\Temp\epsilon-Admin\Passwords\All Passwords.txt

                                  Filesize

                                  231B

                                  MD5

                                  dec2be4f1ec3592cea668aa279e7cc9b

                                  SHA1

                                  327cf8ab0c895e10674e00ea7f437784bb11d718

                                  SHA256

                                  753b99d2b4e8c58bfd10995d0c2c19255fe9c8f53703bb27d1b6f76f1f4e83cc

                                  SHA512

                                  81728e3d31b72905b3a09c79d1e307c4e8e79d436fcfe7560a8046b46ca4ae994fdfaeb1bc2328e35f418b8128f2e7239289e84350e142146df9cde86b20bb66

                                • C:\Users\Admin\AppData\Roaming\Microsoft\Spelling\en-US\default.dic

                                  Filesize

                                  2B

                                  MD5

                                  f3b25701fe362ec84616a93a45ce9998

                                  SHA1

                                  d62636d8caec13f04e28442a0a6fa1afeb024bbb

                                  SHA256

                                  b3d510ef04275ca8e698e5b3cbb0ece3949ef9252f0cdc839e9ee347409a2209

                                  SHA512

                                  98c5f56f3de340690c139e58eb7dac111979f0d4dffe9c4b24ff849510f4b6ffa9fd608c0a3de9ac3c9fd2190f0efaf715309061490f9755a9bfdf1c54ca0d84

                                • C:\Users\Admin\AppData\Roaming\TikToKBuilder\Network\Network Persistent State

                                  Filesize

                                  300B

                                  MD5

                                  afecf3bd83093d22a39af315139e7e10

                                  SHA1

                                  4c48d848712c0d1621174e9f088566bc6417ed27

                                  SHA256

                                  91478c063f4d30d649fc1ce0e3681a4484a909ddf022eccc52f1fddd7dfe2db9

                                  SHA512

                                  5a87db6a98d3af4219ba9f73672cac4890c8fa3942791b7c64ce7956ca847b44f54decadf8ff4e17ce167a4e413b2035b07551dfcb83a1906c639d491965ab9d

                                • C:\Users\Admin\AppData\Roaming\TikToKBuilder\Network\Network Persistent State~RFe58e46f.TMP

                                  Filesize

                                  59B

                                  MD5

                                  2800881c775077e1c4b6e06bf4676de4

                                  SHA1

                                  2873631068c8b3b9495638c865915be822442c8b

                                  SHA256

                                  226eec4486509917aa336afebd6ff65777b75b65f1fb06891d2a857a9421a974

                                  SHA512

                                  e342407ab65cc68f1b3fd706cd0a37680a0864ffd30a6539730180ede2cdcd732cc97ae0b9ef7db12da5c0f83e429df0840dbf7596aca859a0301665e517377b

                                • memory/2016-139-0x000001B75A160000-0x000001B75A161000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/2016-140-0x000001B75A160000-0x000001B75A161000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/2016-141-0x000001B75A160000-0x000001B75A161000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/2016-146-0x000001B75A160000-0x000001B75A161000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/2016-147-0x000001B75A160000-0x000001B75A161000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/2016-145-0x000001B75A160000-0x000001B75A161000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/2016-148-0x000001B75A160000-0x000001B75A161000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/2016-149-0x000001B75A160000-0x000001B75A161000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/2016-150-0x000001B75A160000-0x000001B75A161000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/2016-151-0x000001B75A160000-0x000001B75A161000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/3588-60-0x00007FFFE3B10000-0x00007FFFE3B11000-memory.dmp

                                  Filesize

                                  4KB

                                • memory/3588-52-0x00007FFFE3200000-0x00007FFFE3201000-memory.dmp

                                  Filesize

                                  4KB