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
    357s
  • max time network
    524s
  • 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:2976
    • 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:2680
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:2548
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:2064
        • 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:2764
        • 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:2436
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 2436 -s 1688
            4⤵
              PID:584
      • C:\Windows\system32\taskeng.exe
        taskeng.exe {430ACD0B-BDE7-49E2-B25C-69C4C8F2F1C0} S-1-5-21-1658372521-4246568289-2509113762-1000:PIRBKNPS\Admin:Interactive:[1]
        1⤵
        • Suspicious use of WriteProcessMemory
        PID:1032
        • 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:1592
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 1592 -s 1796
            3⤵
              PID:3056

        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

          15d091fce0565fa5f9bf66b32d7ef193

          SHA1

          bb13744f746c26217d372f5709617e339981214c

          SHA256

          85968b299c3305e1192a15f5959b8178bea7b524fda19a85f90fdb2bade7a29f

          SHA512

          c246b1060e6ebb8405b6779b5de115a394bac7e1335b586a88b4e4e9cdb6b6c6e8d2b823421380f470d1fe77a2f73239686e03c2753d36960421f9e5a1f7c0a4

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

          Filesize

          344B

          MD5

          998a25b3a96fec1bb0155ed5376059d3

          SHA1

          9d266e8be9dd9919645666fe3ca3f6db88bec590

          SHA256

          fcdbf26a81203c60e188dc5d12720e0779417d19099a353e49d59612c81e35f8

          SHA512

          d9c64c70be14c865b822d78738ea083161ba03c48b6c6aaf5a9099ce3b4217660a466ab283016a65eb7dd1ab723eabe748ddc120473c8c2eb98b8a1111e25e7f

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

          Filesize

          4B

          MD5

          77edbe5f897a5dbcde49d31bec1537b8

          SHA1

          e11c349af657a37edaa85cabe53b25f76ee035f2

          SHA256

          a38794ca63aaead5358bdec68ba550098879c8472d3a6b3cbfce0b5ec98fc08d

          SHA512

          b7e5a3013bd5be6a4f39762e8fcdfccaafc9f07ebe40141007c5c6378c0a3cacd7f6ebd1c1ad80cdfd086365bdf5f1bdf8cd7968df12f40e55d8ed4c5cdcd692

        • 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\Cab6CDA.tmp

          Filesize

          65KB

          MD5

          ac05d27423a85adc1622c714f2cb6184

          SHA1

          b0fe2b1abddb97837ea0195be70ab2ff14d43198

          SHA256

          c6456e12e5e53287a547af4103e0397cb9697e466cf75844312dc296d43d144d

          SHA512

          6d0ef9050e41fbae680e0e59dd0f90b6ac7fea5579ef5708b69d5da33a0ece7e8b16574b58b17b64a34cc34a4ffc22b4a62c1ece61f36c4a11a0665e0536b90d

        • C:\Users\Admin\AppData\Local\Temp\Tar6E47.tmp

          Filesize

          177KB

          MD5

          435a9ac180383f9fa094131b173a2f7b

          SHA1

          76944ea657a9db94f9a4bef38f88c46ed4166983

          SHA256

          67dc37ed50b8e63272b49a254a6039ee225974f1d767bb83eb1fd80e759a7c34

          SHA512

          1a6b277611959720a9c71114957620517ad94541302f164eb872bd322292a952409bafb8bc2ac793b16ad5f25d83f8594ccff2b7834e3c2b2b941e6fc84c009a

        • memory/1592-82-0x000000001B160000-0x000000001B1E0000-memory.dmp

          Filesize

          512KB

        • memory/1592-106-0x000000001B160000-0x000000001B1E0000-memory.dmp

          Filesize

          512KB

        • memory/1592-105-0x000007FEF4960000-0x000007FEF534C000-memory.dmp

          Filesize

          9.9MB

        • memory/1592-81-0x000007FEF4960000-0x000007FEF534C000-memory.dmp

          Filesize

          9.9MB

        • memory/2436-102-0x000007FEF4960000-0x000007FEF534C000-memory.dmp

          Filesize

          9.9MB

        • memory/2436-11-0x0000000002340000-0x00000000023C0000-memory.dmp

          Filesize

          512KB

        • memory/2436-104-0x0000000002340000-0x00000000023C0000-memory.dmp

          Filesize

          512KB

        • memory/2436-9-0x0000000000C00000-0x0000000000C30000-memory.dmp

          Filesize

          192KB

        • memory/2436-10-0x000007FEF4960000-0x000007FEF534C000-memory.dmp

          Filesize

          9.9MB

        • memory/2976-5-0x000007FEF5350000-0x000007FEF5D3C000-memory.dmp

          Filesize

          9.9MB

        • memory/2976-0-0x0000000000850000-0x0000000000880000-memory.dmp

          Filesize

          192KB

        • memory/2976-2-0x000000001B040000-0x000000001B0C0000-memory.dmp

          Filesize

          512KB

        • memory/2976-1-0x000007FEF5350000-0x000007FEF5D3C000-memory.dmp

          Filesize

          9.9MB