Resubmissions

13/09/2023, 12:34

230913-prw8psed27 10

13/09/2023, 12:27

230913-pm4rzsec87 10

Analysis

  • max time kernel
    12s
  • max time network
    137s
  • platform
    windows7_x64
  • resource
    win7-20230831-en
  • resource tags

    arch:x64arch:x86image:win7-20230831-enlocale:en-usos:windows7-x64system
  • submitted
    13/09/2023, 12:27

General

  • Target

    f21559ac7c67d871d4f05.exe

  • Size

    327KB

  • MD5

    78fd6df30f791c7b5f45dca0b4c952a5

  • SHA1

    d977ca82da0850eb5d4e69c9c657d1a41fb9c44d

  • SHA256

    dba8f020ac6d09728422932492657fea3f0a95754cd279f5a949b6982bd32129

  • SHA512

    abf0efb2412c522fbb7f6725a548e8d6a8bc045801a4dd8652a544a1527b99647140ad4843c41a6b00a728a5d8361c7e2ea80eba8ee3b291238729277dad228d

  • SSDEEP

    6144:Vc6sWfGY/yODx332tOIXlU1QWZxXAnuHW9bbGDwVdqe1mM:Ps+CXIAuGG8dA

Malware Config

Extracted

Family

gurcu

C2

https://api.telegram.org/bot5968091729:AAHVag_ncx5c5AIYERGTqv9kr7clJT1_HDU/sendMessage?chat_id=-1001962300376

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.

  • Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs
  • 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 3 IoCs
  • Suspicious use of WriteProcessMemory 18 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\f21559ac7c67d871d4f05.exe
    "C:\Users\Admin\AppData\Local\Temp\f21559ac7c67d871d4f05.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2260
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "f21559ac7c67d871d4f05" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\f21559ac7c67d871d4f05.exe" &&START "" "C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe"
      2⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:2656
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:2592
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:2560
        • C:\Windows\system32\schtasks.exe
          schtasks /create /tn "f21559ac7c67d871d4f05" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe" /rl HIGHEST /f
          3⤵
          • Creates scheduled task(s)
          PID:2700
        • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
          "C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe"
          3⤵
          • Executes dropped EXE
          • Accesses Microsoft Outlook profiles
          • Modifies system certificate store
          • Suspicious use of AdjustPrivilegeToken
          • outlook_office_path
          • outlook_win_path
          PID:2472
    • C:\Windows\system32\taskeng.exe
      taskeng.exe {3CFC98DF-7D02-4B56-ACF0-CAA51902566E} S-1-5-21-86725733-3001458681-3405935542-1000:ZWKQHIWB\Admin:Interactive:[1]
      1⤵
      • Suspicious use of WriteProcessMemory
      PID:828
      • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe
        2⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        PID:2364

    Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            304B

            MD5

            e3b21b9cfa7b6f05480f511688680fb9

            SHA1

            8cde856be87c00bed0be41a287c4b3af9debee7c

            SHA256

            5ff328b0c86b9c412f3d213fabc0b8683aef64dfd9a5028841c01790c7fb68ce

            SHA512

            2f2a7ff8ffef678e7987a40466666d01fefbed3663181eac326efcadd1c2c7763d1984a1a067bdbfdc936e8b9d4fc50c9994474f6fb822f9b5ffd787a247fecd

          • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe

            Filesize

            327KB

            MD5

            78fd6df30f791c7b5f45dca0b4c952a5

            SHA1

            d977ca82da0850eb5d4e69c9c657d1a41fb9c44d

            SHA256

            dba8f020ac6d09728422932492657fea3f0a95754cd279f5a949b6982bd32129

            SHA512

            abf0efb2412c522fbb7f6725a548e8d6a8bc045801a4dd8652a544a1527b99647140ad4843c41a6b00a728a5d8361c7e2ea80eba8ee3b291238729277dad228d

          • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe

            Filesize

            327KB

            MD5

            78fd6df30f791c7b5f45dca0b4c952a5

            SHA1

            d977ca82da0850eb5d4e69c9c657d1a41fb9c44d

            SHA256

            dba8f020ac6d09728422932492657fea3f0a95754cd279f5a949b6982bd32129

            SHA512

            abf0efb2412c522fbb7f6725a548e8d6a8bc045801a4dd8652a544a1527b99647140ad4843c41a6b00a728a5d8361c7e2ea80eba8ee3b291238729277dad228d

          • C:\Users\Admin\AppData\Local\Nvidia\f21559ac7c67d871d4f05.exe

            Filesize

            327KB

            MD5

            78fd6df30f791c7b5f45dca0b4c952a5

            SHA1

            d977ca82da0850eb5d4e69c9c657d1a41fb9c44d

            SHA256

            dba8f020ac6d09728422932492657fea3f0a95754cd279f5a949b6982bd32129

            SHA512

            abf0efb2412c522fbb7f6725a548e8d6a8bc045801a4dd8652a544a1527b99647140ad4843c41a6b00a728a5d8361c7e2ea80eba8ee3b291238729277dad228d

          • C:\Users\Admin\AppData\Local\Temp\Cab7C44.tmp

            Filesize

            61KB

            MD5

            f3441b8572aae8801c04f3060b550443

            SHA1

            4ef0a35436125d6821831ef36c28ffaf196cda15

            SHA256

            6720349e7d82ee0a8e73920d3c2b7cb2912d9fcf2edb6fd98f2f12820158b0bf

            SHA512

            5ba01ba421b50030e380ae6bbcd2f681f2a91947fe7fedb3c8e6b5f24dce9517abf57b1cf26cc6078d4bb53bde6fcfb2561591337c841f8f2cb121a3d71661b9

          • C:\Users\Admin\AppData\Local\Temp\Tar7C67.tmp

            Filesize

            163KB

            MD5

            9441737383d21192400eca82fda910ec

            SHA1

            725e0d606a4fc9ba44aa8ffde65bed15e65367e4

            SHA256

            bc3a6e84e41faeb57e7c21aa3b60c2a64777107009727c5b7c0ed8fe658909e5

            SHA512

            7608dd653a66cd364392a78d4711b48d1707768d36996e4d38871c6843b5714e1d7da4b4cc6db969e6000cfa182bcb74216ef6823d1063f036fc5c3413fb8dcf

          • memory/2260-0-0x0000000000EF0000-0x0000000000F48000-memory.dmp

            Filesize

            352KB

          • memory/2260-5-0x000007FEF5440000-0x000007FEF5E2C000-memory.dmp

            Filesize

            9.9MB

          • memory/2260-2-0x0000000000C30000-0x0000000000CB0000-memory.dmp

            Filesize

            512KB

          • memory/2260-1-0x000007FEF5440000-0x000007FEF5E2C000-memory.dmp

            Filesize

            9.9MB

          • memory/2364-78-0x000007FEF4A50000-0x000007FEF543C000-memory.dmp

            Filesize

            9.9MB

          • memory/2364-79-0x000000001B320000-0x000000001B3A0000-memory.dmp

            Filesize

            512KB

          • memory/2364-80-0x000007FEF4A50000-0x000007FEF543C000-memory.dmp

            Filesize

            9.9MB

          • memory/2472-10-0x000007FEF4A50000-0x000007FEF543C000-memory.dmp

            Filesize

            9.9MB

          • memory/2472-9-0x00000000000E0000-0x0000000000138000-memory.dmp

            Filesize

            352KB

          • memory/2472-11-0x000000001B250000-0x000000001B2D0000-memory.dmp

            Filesize

            512KB