Resubmissions

10-04-2024 02:49

240410-da1n1sfe7v 10

10-04-2024 02:49

240410-daz3gscc34 10

10-04-2024 02:48

240410-dazfyscc32 10

10-04-2024 02:48

240410-dayvesfe7s 10

14-10-2023 03:45

231014-ea62gage69 10

Analysis

  • max time kernel
    838s
  • max time network
    912s
  • platform
    windows7_x64
  • resource
    win7-20240319-en
  • resource tags

    arch:x64arch:x86image:win7-20240319-enlocale:en-usos:windows7-x64system
  • submitted
    10-04-2024 02:49

General

  • Target

    B9a5797cb584014f3fede.exe

  • Size

    530KB

  • MD5

    862e7aeb18ba5892f51b5712a213a614

  • SHA1

    99d86e4247f52c3ea9b2bb476af66dfc7707fa8d

  • SHA256

    44eca198c64197c511441f644895afd6a2777c28bcb6a376d4d4623b030ced31

  • SHA512

    678fc8fb5dc887f41db90e6341229ce35c830ffac4cbb91ea669ab5e8bc849bae05c15909ae62e4dfd3a249bb2ff062eaa0e256989fe203863db0396c60ec713

  • SSDEEP

    6144:XHClm6SWPoK5Z0EwVSmRPQd/t/a2zDGVPJXvnzZjDJHb571Kjn1929XDccHd8JyO:XHCnZxb88RatpvnzZjDv7oj19yTNTY

Malware Config

Extracted

Family

gurcu

C2

https://api.telegram.org/bot6176004110:AAFKA5be4dMwA848HWxzYIzrzzOGIHMOJGc/sendMessage?chat_id=615133582

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.

  • Accesses Microsoft Outlook profiles 1 TTPs 6 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.

  • 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 3 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.

  • outlook_office_path 1 IoCs
  • outlook_win_path 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\B9a5797cb584014f3fede.exe
    "C:\Users\Admin\AppData\Local\Temp\B9a5797cb584014f3fede.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1396
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "B9a5797cb584014f3fede" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\B9a5797cb584014f3fede.exe" &&START "" "C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe"
      2⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:2264
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:2916
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:2528
        • C:\Windows\system32\schtasks.exe
          schtasks /create /tn "B9a5797cb584014f3fede" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe" /rl HIGHEST /f
          3⤵
          • Creates scheduled task(s)
          PID:2544
        • C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
          "C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe"
          3⤵
          • Executes dropped EXE
          • Accesses Microsoft Outlook profiles
          • Modifies system certificate store
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:2772
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 2772 -s 964
            4⤵
              PID:1904
      • C:\Windows\system32\taskeng.exe
        taskeng.exe {52AEC97A-6191-455F-A7F7-EA90F8B46252} S-1-5-21-2610426812-2871295383-373749122-1000:UEITMFAB\Admin:Interactive:[1]
        1⤵
        • Suspicious use of WriteProcessMemory
        PID:1632
        • C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
          C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe
          2⤵
          • Executes dropped EXE
          • Accesses Microsoft Outlook profiles
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          • outlook_office_path
          • outlook_win_path
          PID:2184
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 2184 -s 3012
            3⤵
              PID:2552

        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

          f1e5f181aef16ed04ec2951c350528c4

          SHA1

          68dd94c1245510bdf7b459a42efec3846a6cac76

          SHA256

          0a352293853ebacf17e652a59fffe62e9573558e1c7aea1b6dd226b7771b471c

          SHA512

          0c360f9008521d26535e5413d650b76f516f5009280c85804f29fd8c6d8e3a324f2ea2c16057ab49c789c16e448ac86c048580191ccc435970774642c6eea036

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

          Filesize

          344B

          MD5

          907422ca866a51843e2a3d7fb15601a7

          SHA1

          d57ebcb20f56f872ca0696712681e80355e59150

          SHA256

          ebbc8c616bcd2f169f625bfb7ad23ee4bcb31d1b90073ded6ff7bf66fe53062f

          SHA512

          1f8dcb76c25e5d0ad4dcbbfc16d78ca3e7ff57154e3b93c7cc75a4f5556f880f1686e1cdbff1468ff73c2a95598e2eded09034348920322d855016142988eadd

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

          Filesize

          344B

          MD5

          8d9f778ca80b088e9b1754e35bca876f

          SHA1

          65ca1080c31630b588b482f3c0fb7294151dda67

          SHA256

          223ef968265ceb2a74b1e110d1c66a32beb00c2a9059f97f564ab02332bd8723

          SHA512

          b2132086414bab6ae197d6632173e18e9735bc0cabe3c468b4d9a456a4cd7cbca204e14ffabca5a47c8bda3ba063db8e895a8960d2c25a0d7c0eee6e94b2964b

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

          Filesize

          344B

          MD5

          c9ca77ee15f59ca8fc700ac457c428d8

          SHA1

          4f78dcc275d6a141d879d1bcf2e2e00f695cd30d

          SHA256

          401ce0f67e7298fcfb73aed92ed76e9a2e9303ca7a557b1b812b9a8ff1b4da51

          SHA512

          a8f107e259c8ce01160db6f6e995624dc7f0f1832c0b9572c16b5df38750c19d375179f213326a39e66b649d1593eb43d560709f2954551af8b59321d7cebf5f

        • C:\Users\Admin\AppData\Local\Nvidia\B9a5797cb584014f3fede.exe

          Filesize

          530KB

          MD5

          862e7aeb18ba5892f51b5712a213a614

          SHA1

          99d86e4247f52c3ea9b2bb476af66dfc7707fa8d

          SHA256

          44eca198c64197c511441f644895afd6a2777c28bcb6a376d4d4623b030ced31

          SHA512

          678fc8fb5dc887f41db90e6341229ce35c830ffac4cbb91ea669ab5e8bc849bae05c15909ae62e4dfd3a249bb2ff062eaa0e256989fe203863db0396c60ec713

        • C:\Users\Admin\AppData\Local\Temp\Cab4C4F.tmp

          Filesize

          67KB

          MD5

          753df6889fd7410a2e9fe333da83a429

          SHA1

          3c425f16e8267186061dd48ac1c77c122962456e

          SHA256

          b42dc237e44cbc9a43400e7d3f9cbd406dbdefd62bfe87328f8663897d69df78

          SHA512

          9d56f79410ad0cf852c74c3ef9454e7ae86e80bdd6ff67773994b48ccac71142bcf5c90635da6a056e1406e81e64674db9584928e867c55b77b59e2851cf6444

        • C:\Users\Admin\AppData\Local\Temp\Tar4DAD.tmp

          Filesize

          177KB

          MD5

          435a9ac180383f9fa094131b173a2f7b

          SHA1

          76944ea657a9db94f9a4bef38f88c46ed4166983

          SHA256

          67dc37ed50b8e63272b49a254a6039ee225974f1d767bb83eb1fd80e759a7c34

          SHA512

          1a6b277611959720a9c71114957620517ad94541302f164eb872bd322292a952409bafb8bc2ac793b16ad5f25d83f8594ccff2b7834e3c2b2b941e6fc84c009a

        • C:\Users\Admin\AppData\Local\gzrj1xdnai\port.dat

          Filesize

          4B

          MD5

          085ccaddbd3aa270b1d72beef6bbc5ca

          SHA1

          d3283df58c20ef0b724c244d001fdf465cda464e

          SHA256

          449cac0b61bf9dbf44fd770c15a065251eadfaa2f42dcfd2a13e17abc4c1b158

          SHA512

          201931d78b438c36ea95e9e5b392dfd4185be756119d8563bef40e12702c322c8a6356714c70120a8fdff92ea61611ccb23168af06ddc644f2f2574b2891d10d

        • memory/1396-5-0x000007FEF5CA0000-0x000007FEF668C000-memory.dmp

          Filesize

          9.9MB

        • memory/1396-0-0x0000000001080000-0x000000000110A000-memory.dmp

          Filesize

          552KB

        • memory/1396-2-0x000000001B1B0000-0x000000001B230000-memory.dmp

          Filesize

          512KB

        • memory/1396-1-0x000007FEF5CA0000-0x000007FEF668C000-memory.dmp

          Filesize

          9.9MB

        • memory/2184-202-0x000007FEF52B0000-0x000007FEF5C9C000-memory.dmp

          Filesize

          9.9MB

        • memory/2184-223-0x000007FEF52B0000-0x000007FEF5C9C000-memory.dmp

          Filesize

          9.9MB

        • memory/2772-9-0x0000000000FD0000-0x000000000105A000-memory.dmp

          Filesize

          552KB

        • memory/2772-11-0x000000001B370000-0x000000001B3F0000-memory.dmp

          Filesize

          512KB

        • memory/2772-200-0x000007FEF52B0000-0x000007FEF5C9C000-memory.dmp

          Filesize

          9.9MB

        • memory/2772-10-0x000007FEF52B0000-0x000007FEF5C9C000-memory.dmp

          Filesize

          9.9MB