Resubmissions

10-04-2024 02:17

240410-cqs4fafc2v 10

10-04-2024 02:17

240410-cqsgxabh56 10

10-04-2024 02:17

240410-cqrwdabh54 10

10-04-2024 02:17

240410-cqrklsbh53 10

13-05-2023 22:56

230513-2wtplahg95 10

Analysis

  • max time kernel
    120s
  • max time network
    123s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    10-04-2024 02:17

General

  • Target

    qsteemp.exe

  • Size

    165KB

  • MD5

    90cd3202af31b431dcc5e47cf3b8c0d7

  • SHA1

    747f68fb8f122241059c219eeeeadac61e8215be

  • SHA256

    e76e206e8ae24f95a329b4f6ecdf1f22b76b07a8c628c0619b781bdba2d85732

  • SHA512

    b1025ca0dfa86cd6649337bfc6b555a9101fce38955566424955a6fe07782bea41eeaf4f233946eb6be5756b23398129bad98a87c6b07478f787df8bf3235481

  • SSDEEP

    3072:fV6h5WXwyNUD44ykiQbGjlc/SGvjQtbGTl2MRMc:9AuwMPkhbGRc/T6A

Score
10/10

Malware Config

Extracted

Family

gurcu

C2

https://api.telegram.org/bot6209822134:AAHQxD-CI1YDVcNbXijXHlonsEUgv3dfYtg/sendMessage?chat_id=-1001529292045

Signatures

  • Gurcu, WhiteSnake

    Gurcu is a malware stealer written in C#.

  • Deletes itself 1 IoCs
  • Executes dropped EXE 2 IoCs
  • Reads WinSCP keys stored on the system 2 TTPs

    Tries to access WinSCP stored sessions.

  • 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).

  • 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
  • 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\qsteemp.exe
    "C:\Users\Admin\AppData\Local\Temp\qsteemp.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2292
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "qsteemp" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\NET.Framework\qsteemp.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\qsteemp.exe" &&START "" "C:\Users\Admin\AppData\Local\NET.Framework\qsteemp.exe"
      2⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:2652
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:2604
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:2556
        • C:\Windows\system32\schtasks.exe
          schtasks /create /tn "qsteemp" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\NET.Framework\qsteemp.exe" /rl HIGHEST /f
          3⤵
          • Creates scheduled task(s)
          PID:2744
        • C:\Users\Admin\AppData\Local\NET.Framework\qsteemp.exe
          "C:\Users\Admin\AppData\Local\NET.Framework\qsteemp.exe"
          3⤵
          • Executes dropped EXE
          • Modifies system certificate store
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:2668
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 2668 -s 1848
            4⤵
              PID:1292
      • C:\Windows\system32\taskeng.exe
        taskeng.exe {675BE534-CCA5-4E49-B65D-8BF4077B54FC} S-1-5-21-778096762-2241304387-192235952-1000:AYFLYVMK\Admin:Interactive:[1]
        1⤵
        • Suspicious use of WriteProcessMemory
        PID:1632
        • C:\Users\Admin\AppData\Local\NET.Framework\qsteemp.exe
          C:\Users\Admin\AppData\Local\NET.Framework\qsteemp.exe
          2⤵
          • Executes dropped EXE
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:1528
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 1528 -s 1812
            3⤵
              PID:2096

        Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

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

          Filesize

          68KB

          MD5

          29f65ba8e88c063813cc50a4ea544e93

          SHA1

          05a7040d5c127e68c25d81cc51271ffb8bef3568

          SHA256

          1ed81fa8dfb6999a9fedc6e779138ffd99568992e22d300acd181a6d2c8de184

          SHA512

          e29b2e92c496245bed3372578074407e8ef8882906ce10c35b3c8deebfefe01b5fd7f3030acaa693e175f4b7aca6cd7d8d10ae1c731b09c5fa19035e005de3aa

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

          Filesize

          344B

          MD5

          00878766b463bdb49d7b937e277764b9

          SHA1

          3ad6cd1d974f142db8fbf8c5199f4c5df5d41542

          SHA256

          aee3067b19917fb36a8f7c55652a56115653786d8f83240dc6831b1526ffc65f

          SHA512

          a8fe4ed76408b21366faf2ad85aec6c2e86ec2e4a05b6fd754a5598c4edf517e70b496e93feb1cbc35777183b94161ed7a2b2bcdf3a2fd86ffe92aeafd27d8e1

        • C:\Users\Admin\AppData\Local\6kfrvwd31o\port.dat

          Filesize

          4B

          MD5

          75f266633433d20abf6c1a13d97e7491

          SHA1

          433a4c6712a3e5dab1f803df1aa87edb3f640d7a

          SHA256

          1ef96e7e96be65f019580723985e9981f0875915219ed9c30c356381ac3d3b37

          SHA512

          57e0ed86029fb8011b95680f1ae78d4562dfc168532602473c92b6aa3a8db981acc9c7915a62bcc6397b68450ed510926dcf18b326dd5687189948f5c7c5ae0b

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

          Filesize

          165KB

          MD5

          90cd3202af31b431dcc5e47cf3b8c0d7

          SHA1

          747f68fb8f122241059c219eeeeadac61e8215be

          SHA256

          e76e206e8ae24f95a329b4f6ecdf1f22b76b07a8c628c0619b781bdba2d85732

          SHA512

          b1025ca0dfa86cd6649337bfc6b555a9101fce38955566424955a6fe07782bea41eeaf4f233946eb6be5756b23398129bad98a87c6b07478f787df8bf3235481

        • C:\Users\Admin\AppData\Local\Temp\Cab7542.tmp

          Filesize

          65KB

          MD5

          ac05d27423a85adc1622c714f2cb6184

          SHA1

          b0fe2b1abddb97837ea0195be70ab2ff14d43198

          SHA256

          c6456e12e5e53287a547af4103e0397cb9697e466cf75844312dc296d43d144d

          SHA512

          6d0ef9050e41fbae680e0e59dd0f90b6ac7fea5579ef5708b69d5da33a0ece7e8b16574b58b17b64a34cc34a4ffc22b4a62c1ece61f36c4a11a0665e0536b90d

        • C:\Users\Admin\AppData\Local\Temp\Tar76CF.tmp

          Filesize

          177KB

          MD5

          435a9ac180383f9fa094131b173a2f7b

          SHA1

          76944ea657a9db94f9a4bef38f88c46ed4166983

          SHA256

          67dc37ed50b8e63272b49a254a6039ee225974f1d767bb83eb1fd80e759a7c34

          SHA512

          1a6b277611959720a9c71114957620517ad94541302f164eb872bd322292a952409bafb8bc2ac793b16ad5f25d83f8594ccff2b7834e3c2b2b941e6fc84c009a

        • memory/1528-113-0x000007FEF5390000-0x000007FEF5D7C000-memory.dmp

          Filesize

          9.9MB

        • memory/1528-92-0x000007FEF5390000-0x000007FEF5D7C000-memory.dmp

          Filesize

          9.9MB

        • memory/2292-5-0x000007FEF5D80000-0x000007FEF676C000-memory.dmp

          Filesize

          9.9MB

        • memory/2292-0-0x0000000000D60000-0x0000000000D90000-memory.dmp

          Filesize

          192KB

        • memory/2292-2-0x000000001B250000-0x000000001B2D0000-memory.dmp

          Filesize

          512KB

        • memory/2292-1-0x000007FEF5D80000-0x000007FEF676C000-memory.dmp

          Filesize

          9.9MB

        • memory/2668-10-0x000007FEF5390000-0x000007FEF5D7C000-memory.dmp

          Filesize

          9.9MB

        • memory/2668-91-0x000007FEF5390000-0x000007FEF5D7C000-memory.dmp

          Filesize

          9.9MB

        • memory/2668-9-0x0000000001380000-0x00000000013B0000-memory.dmp

          Filesize

          192KB