Analysis

  • max time kernel
    150s
  • max time network
    164s
  • platform
    windows7_x64
  • resource
    win7-20230220-en
  • resource tags

    arch:x64arch:x86image:win7-20230220-enlocale:en-usos:windows7-x64system
  • submitted
    05-05-2023 11:18

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 2 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 1 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 behavior: EnumeratesProcesses 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 21 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

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:1788
    • 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:1188
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:656
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:524
        • 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:1912
        • C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe
          "C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe"
          3⤵
          • Executes dropped EXE
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:1420
    • C:\Windows\system32\taskeng.exe
      taskeng.exe {E63FC395-A0F1-4ACE-941B-BE48149C5DBD} S-1-5-21-2647223082-2067913677-935928954-1000:BPOQNXYB\Admin:Interactive:[1]
      1⤵
      • Suspicious use of WriteProcessMemory
      PID:1240
      • C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe
        C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe
        2⤵
        • Executes dropped EXE
        • Modifies system certificate store
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:932
        • C:\Windows\system32\WerFault.exe
          C:\Windows\system32\WerFault.exe -u -p 932 -s 1828
          3⤵
          • Program crash
          PID:964

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

    Loading Replay Monitor...

    Downloads

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

      Filesize

      62KB

      MD5

      3ac860860707baaf32469fa7cc7c0192

      SHA1

      c33c2acdaba0e6fa41fd2f00f186804722477639

      SHA256

      d015145d551ecd14916270efad773bbc9fd57fad2228d2c24559f696c961d904

      SHA512

      d62ad2408c969a95550fb87efda50f988770ba5e39972041bf85924275baf156b8bec309ecc6409e5acdd37ec175dea40eff921ab58933b5b5b5d35a6147567c

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

      Filesize

      344B

      MD5

      dd1f7055d35d7baabe2bdbdadc08c1a4

      SHA1

      901fae40eaded811a60536f860fdf5566ae0ae7e

      SHA256

      39f9d9451e243550e9cb5784eaefde0a6d55d4291ce424d70918613bde2a966a

      SHA512

      5d7f3bc82217857324d63da089ac276d739781c3bb73f3e56c46266810fbb31323c8fba1d7d11ec1d82f1f796579b6d47b671cc5e093d0d03d4d282d0da9e70f

    • 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\Cab5555.tmp

      Filesize

      61KB

      MD5

      fc4666cbca561e864e7fdf883a9e6661

      SHA1

      2f8d6094c7a34bf12ea0bbf0d51ee9c5bb7939a5

      SHA256

      10f3deb6c452d749a7451b5d065f4c0449737e5ee8a44f4d15844b503141e65b

      SHA512

      c71f54b571e01f247f072be4bbebdf5d8410b67eb79a61e7e0d9853fe857ab9bd12f53e6af3394b935560178107291fc4be351b27deb388eba90ba949633d57d

    • C:\Users\Admin\AppData\Local\Temp\Tar5C6D.tmp

      Filesize

      164KB

      MD5

      4ff65ad929cd9a367680e0e5b1c08166

      SHA1

      c0af0d4396bd1f15c45f39d3b849ba444233b3a2

      SHA256

      c8733c93cc5aaf5ca206d06af22ee8dbdec764fb5085019a6a9181feb9dfdee6

      SHA512

      f530dc0d024a5a3b8903ffaaa41b608a5ccdd6da4ba1949f2c2e55a9fca475fec5c8d2119b5763cabe7ef1c3788fb9dcac621869db51d65b1d83cfe404fb4c27

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

      Filesize

      4B

      MD5

      2fcd5cf1ebcd4213d8a17edc4cd47ad7

      SHA1

      bf965d362c840957f51dbcacf5935af5bf368ad3

      SHA256

      4f90f57995205e8e464da0003d837a18dbe017f7290ea22edafe4709cb1e67cc

      SHA512

      9216e4d2ea2d084cd0152b0749e8770b4642351ecde6f5ef458cd77e7000b68e975dfcf14bb534ecd24167c37479cc282eebded7f486f679f7a1deeece75c76c

    • memory/1420-61-0x000000001A600000-0x000000001A680000-memory.dmp

      Filesize

      512KB

    • memory/1420-63-0x000000001A600000-0x000000001A680000-memory.dmp

      Filesize

      512KB

    • memory/1788-54-0x0000000000370000-0x00000000003A0000-memory.dmp

      Filesize

      192KB

    • memory/1788-55-0x000000001AC90000-0x000000001AD10000-memory.dmp

      Filesize

      512KB