Analysis

  • max time kernel
    118s
  • max time network
    137s
  • platform
    windows7_x64
  • resource
    win7-20230712-en
  • resource tags

    arch:x64arch:x86image:win7-20230712-enlocale:en-usos:windows7-x64system
  • submitted
    23-08-2023 14:59

General

  • Target

    build_4.exe

  • Size

    165KB

  • MD5

    547933c1a8ea0eb111e619d70ca2c657

  • SHA1

    aca394a095c3951ace115ac621a67df1ff4d2e33

  • SHA256

    fdc83f58a30b80240c5887c6646324600f3896421059b80caddacfdb196287ea

  • SHA512

    5df1b41c5f19e304cc0758b175252c17cc6ccb1d3d91ba2f153138dfbd8e2ef3cd6efe8a136559c55952bdb43a7f206f7ba4e04674ee95363ca8409e48745c2b

  • SSDEEP

    1536:ROwwIJbzij3pPEOGFmd8Szav8IDYFUxT1DR5jPVSBSVG41AG9wL4yXacCwPIC6Xi:RyIlz2p8Yai3GNzDeeb4FzeDGwKSHqj

Score
10/10

Malware Config

Extracted

Family

gurcu

C2

https://api.telegram.org/bot6193093056:AAHzyNGUGS9aUG6CCx6ENLoXpCFLzEQywIQ/sendMessage?chat_id=1098292643

Signatures

  • Gurcu, WhiteSnake

    Gurcu is a malware stealer written in C#.

  • Deletes itself 1 IoCs
  • Executes dropped EXE 2 IoCs
  • Reads user/profile data of web browsers 2 TTPs

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

  • Looks up external IP address via web service 1 IoCs

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

  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Program crash 2 IoCs
  • Creates scheduled task(s) 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Modifies system certificate store 2 TTPs 6 IoCs
  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 24 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\build_4.exe
    "C:\Users\Admin\AppData\Local\Temp\build_4.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2324
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "build_4" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\build_4.exe" &&START "" "C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe"
      2⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:1064
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:2488
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:2088
        • C:\Windows\system32\schtasks.exe
          schtasks /create /tn "build_4" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe" /rl HIGHEST /f
          3⤵
          • Creates scheduled task(s)
          PID:2820
        • C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe
          "C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe"
          3⤵
          • Executes dropped EXE
          • Modifies system certificate store
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:2924
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 2924 -s 1820
            4⤵
            • Program crash
            PID:2908
    • C:\Windows\system32\taskeng.exe
      taskeng.exe {EBACE076-C6D2-4838-822A-72C95596D12E} S-1-5-21-377084978-2088738870-2818360375-1000:DSWJWADP\Admin:Interactive:[1]
      1⤵
      • Suspicious use of WriteProcessMemory
      PID:808
      • C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe
        C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe
        2⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2772
        • C:\Windows\system32\WerFault.exe
          C:\Windows\system32\WerFault.exe -u -p 2772 -s 1804
          3⤵
          • Program crash
          PID:1892

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\94308059B57B3142E455B38A6EB92015

      Filesize

      61KB

      MD5

      e56ec378251cd65923ad88c1e14d0b6e

      SHA1

      7f5d986e0a34dd81487f6439fb0446ffa52a712e

      SHA256

      32ccf567c07b62b6078cf03d097e21cbf7ef67a4ce312c9c34a47f865b3ad0a0

      SHA512

      2737a622ca45b532aebc202184b3e35cde8684e5296cb1f008e7831921be2895a43f952c1df88d33011a7b9586aafbd88483f6c134cb5e8e98c236f5abb5f3aa

    • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\94308059B57B3142E455B38A6EB92015

      Filesize

      61KB

      MD5

      e56ec378251cd65923ad88c1e14d0b6e

      SHA1

      7f5d986e0a34dd81487f6439fb0446ffa52a712e

      SHA256

      32ccf567c07b62b6078cf03d097e21cbf7ef67a4ce312c9c34a47f865b3ad0a0

      SHA512

      2737a622ca45b532aebc202184b3e35cde8684e5296cb1f008e7831921be2895a43f952c1df88d33011a7b9586aafbd88483f6c134cb5e8e98c236f5abb5f3aa

    • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015

      Filesize

      344B

      MD5

      fb200a1fea3bde623fd0733da9d9759b

      SHA1

      2f5a1ead16903aeb478b944aee65249e93d9878e

      SHA256

      43b4b33655f626ca9361fb9010fbfbe881d5e294e5b7c6c8b7cca259dfb6926d

      SHA512

      1d17a46aa7c767816946d1a1fe08c2248bb60fea753cdffe9fccc550166d4f5a02bc9aebca201cf0e0f6138c3fb3152fcebf21b2e47636c248c0a993bbab058e

    • C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015

      Filesize

      344B

      MD5

      d4824d978bcb35dea927823ab0d459f8

      SHA1

      ac6cdcc1f1990ef58657bf4a9dedaa5629f63b73

      SHA256

      4dd1d8e767d487d89c2ec938bb0d760f76fc8c12d3e5973419fdf67e22a0c079

      SHA512

      b6a49a3227c48a7900ef53efca8426d7f356e893e845b827c07bc966f79ec19360f31d1439ccecab9da0686254725b596f881f5da69b991103704743b251eddc

    • C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe

      Filesize

      165KB

      MD5

      547933c1a8ea0eb111e619d70ca2c657

      SHA1

      aca394a095c3951ace115ac621a67df1ff4d2e33

      SHA256

      fdc83f58a30b80240c5887c6646324600f3896421059b80caddacfdb196287ea

      SHA512

      5df1b41c5f19e304cc0758b175252c17cc6ccb1d3d91ba2f153138dfbd8e2ef3cd6efe8a136559c55952bdb43a7f206f7ba4e04674ee95363ca8409e48745c2b

    • C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe

      Filesize

      165KB

      MD5

      547933c1a8ea0eb111e619d70ca2c657

      SHA1

      aca394a095c3951ace115ac621a67df1ff4d2e33

      SHA256

      fdc83f58a30b80240c5887c6646324600f3896421059b80caddacfdb196287ea

      SHA512

      5df1b41c5f19e304cc0758b175252c17cc6ccb1d3d91ba2f153138dfbd8e2ef3cd6efe8a136559c55952bdb43a7f206f7ba4e04674ee95363ca8409e48745c2b

    • C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe

      Filesize

      165KB

      MD5

      547933c1a8ea0eb111e619d70ca2c657

      SHA1

      aca394a095c3951ace115ac621a67df1ff4d2e33

      SHA256

      fdc83f58a30b80240c5887c6646324600f3896421059b80caddacfdb196287ea

      SHA512

      5df1b41c5f19e304cc0758b175252c17cc6ccb1d3d91ba2f153138dfbd8e2ef3cd6efe8a136559c55952bdb43a7f206f7ba4e04674ee95363ca8409e48745c2b

    • C:\Users\Admin\AppData\Local\Temp\CabB7ED.tmp

      Filesize

      62KB

      MD5

      3ac860860707baaf32469fa7cc7c0192

      SHA1

      c33c2acdaba0e6fa41fd2f00f186804722477639

      SHA256

      d015145d551ecd14916270efad773bbc9fd57fad2228d2c24559f696c961d904

      SHA512

      d62ad2408c969a95550fb87efda50f988770ba5e39972041bf85924275baf156b8bec309ecc6409e5acdd37ec175dea40eff921ab58933b5b5b5d35a6147567c

    • C:\Users\Admin\AppData\Local\Temp\TarBA54.tmp

      Filesize

      163KB

      MD5

      19399ab248018076e27957e772bcfbab

      SHA1

      faef897e02d9501146beb49f75da1caf12967b88

      SHA256

      326842dd8731e37c8c27a08373c7ac341e6c72226cc850084e3a17d26675f3c9

      SHA512

      6d5b12ec637ef4223fdd0e271cdc9f860b060ff08d380bba546ac6962b1d672003f9ae9556d65282d8083e830d4277bad8d16443720716077e542ab0262b0103

    • C:\Users\Admin\AppData\Local\d92pmiifqt\port.dat

      Filesize

      4B

      MD5

      b7f520a55897b35e6eb462bbf80915c6

      SHA1

      fe16a4aff54b7a7ebe04151656dc5e50d21998c2

      SHA256

      4cedaf7dcf3a15cd223d8a7513ad946d91fcd9e5f45f1644b6ee697f6897c309

      SHA512

      a1b6939f25b531ba53ecefb9390f473679e6e39627fd4a26ce64e6fddf8b8c14b7f3d4b13263c68d4f157d8dc7bbd91a8bd4638943f9fb3ee9ccd80503169fc1

    • memory/2324-0-0x0000000000090000-0x00000000000C0000-memory.dmp

      Filesize

      192KB

    • memory/2324-1-0x000007FEF5C90000-0x000007FEF667C000-memory.dmp

      Filesize

      9.9MB

    • memory/2324-5-0x000007FEF5C90000-0x000007FEF667C000-memory.dmp

      Filesize

      9.9MB

    • memory/2324-2-0x000000001B110000-0x000000001B190000-memory.dmp

      Filesize

      512KB

    • memory/2772-83-0x000007FEF52A0000-0x000007FEF5C8C000-memory.dmp

      Filesize

      9.9MB

    • memory/2772-85-0x000000001AEE0000-0x000000001AF60000-memory.dmp

      Filesize

      512KB

    • memory/2772-105-0x000007FEF52A0000-0x000007FEF5C8C000-memory.dmp

      Filesize

      9.9MB

    • memory/2772-106-0x000000001AEE0000-0x000000001AF60000-memory.dmp

      Filesize

      512KB

    • memory/2924-9-0x00000000000E0000-0x0000000000110000-memory.dmp

      Filesize

      192KB

    • memory/2924-11-0x000000001B110000-0x000000001B190000-memory.dmp

      Filesize

      512KB

    • memory/2924-81-0x000000001B110000-0x000000001B190000-memory.dmp

      Filesize

      512KB

    • memory/2924-80-0x000007FEF52A0000-0x000007FEF5C8C000-memory.dmp

      Filesize

      9.9MB

    • memory/2924-10-0x000007FEF52A0000-0x000007FEF5C8C000-memory.dmp

      Filesize

      9.9MB