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Analysis

  • max time kernel
    49s
  • max time network
    136s
  • platform
    windows7_x64
  • resource
    win7-20230220-en
  • resource tags

    arch:x64arch:x86image:win7-20230220-enlocale:en-usos:windows7-x64system
  • submitted
    05/05/2023, 21:00

General

  • Target

    testlibidrequest.exe

  • Size

    183KB

  • MD5

    c2302bfa2c8c29f71e98ebf44f33b9a4

  • SHA1

    2c2d10c1203a4e18fe912069ab702720239dd00f

  • SHA256

    138a262303b34cf0da63a5a8d32217db66f97ef5873dbac0f51ada3659c8cb3f

  • SHA512

    9d0a67476039b8f26216af1c9d56c0f0e6a6d4797eab2640e2f1720d0e451ca09459e2293a0dd66f60325688cba17ad82f9b62cb3fabfb118c2f40950168b0e6

  • SSDEEP

    3072:BXPyScIGLPEPYtsCUwJRuuZES9bVMO0pJLjTTC9nAk9lI6FZ/8y2FP8iKIaQnzHz:djgZES9bVP0pJLjTTC9nAk9lI6FV2Lu

Malware Config

Extracted

Family

gurcu

C2

https://api.telegram.org/bot6278551241:AAGQ87XJeSopFO3i5HU3dXW_vXCr-ESRByQ/sendMessage?chat_id=1396661331

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 6 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).

  • Program crash 2 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 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.

  • outlook_office_path 1 IoCs
  • outlook_win_path 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\testlibidrequest.exe
    "C:\Users\Admin\AppData\Local\Temp\testlibidrequest.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:836
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "testlibidrequest" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\NET.Framework\testlibidrequest.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\testlibidrequest.exe" &&START "" "C:\Users\Admin\AppData\Local\NET.Framework\testlibidrequest.exe"
      2⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:1420
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:684
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:1288
        • C:\Windows\system32\schtasks.exe
          schtasks /create /tn "testlibidrequest" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\NET.Framework\testlibidrequest.exe" /rl HIGHEST /f
          3⤵
          • Creates scheduled task(s)
          PID:460
        • C:\Users\Admin\AppData\Local\NET.Framework\testlibidrequest.exe
          "C:\Users\Admin\AppData\Local\NET.Framework\testlibidrequest.exe"
          3⤵
          • Executes dropped EXE
          • Accesses Microsoft Outlook profiles
          • Modifies system certificate store
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:576
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 576 -s 1892
            4⤵
            • Program crash
            PID:2028
    • C:\Windows\system32\taskeng.exe
      taskeng.exe {A92EF448-82B1-4ABB-BE51-652D8E38FF15} S-1-5-21-3499517378-2376672570-1134980332-1000:MLXLFKOI\Admin:Interactive:[1]
      1⤵
      • Suspicious use of WriteProcessMemory
      PID:684
      • C:\Users\Admin\AppData\Local\NET.Framework\testlibidrequest.exe
        C:\Users\Admin\AppData\Local\NET.Framework\testlibidrequest.exe
        2⤵
        • Executes dropped EXE
        • Accesses Microsoft Outlook profiles
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        • outlook_office_path
        • outlook_win_path
        PID:1288
        • C:\Windows\system32\WerFault.exe
          C:\Windows\system32\WerFault.exe -u -p 1288 -s 1864
          3⤵
          • Program crash
          PID:1064

    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\Content\94308059B57B3142E455B38A6EB92015

      Filesize

      62KB

      MD5

      3ac860860707baaf32469fa7cc7c0192

      SHA1

      c33c2acdaba0e6fa41fd2f00f186804722477639

      SHA256

      d015145d551ecd14916270efad773bbc9fd57fad2228d2c24559f696c961d904

      SHA512

      d62ad2408c969a95550fb87efda50f988770ba5e39972041bf85924275baf156b8bec309ecc6409e5acdd37ec175dea40eff921ab58933b5b5b5d35a6147567c

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

      Filesize

      304B

      MD5

      f3db754e23c879f7df7a6d8c7df794f5

      SHA1

      7fa4cd6e896402282c2299d6705fec18dc5f3f07

      SHA256

      0312a5da0d0cf800524a089f90a4752088473738a60fae071fd6e9eca81db956

      SHA512

      705da2173137289cd3551b95c0732c6c431b002b4de63e1d3d559296cc6b7821bf7e82abb46e7c78e1ec716f7fceec9e1bd352fabe4852cad66e8e5ff156a29b

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

      Filesize

      304B

      MD5

      6b733243ceaa498bafa872476c0e9b3a

      SHA1

      6b8d048bb4fb13825e59c28857113cd31d72ef1a

      SHA256

      a6a26763c6adf3b7295eb3e969db98cc75341a46fe64e1fd38041c9800aeee73

      SHA512

      6fa4203204cc3c4bed4c1640e1455a2b90e144ab810aceecb8223ec138dc9d9b6173186c562e2d0530a93ebe07503bdf874cfb674590e27f260f657135d8bef9

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

      Filesize

      183KB

      MD5

      c2302bfa2c8c29f71e98ebf44f33b9a4

      SHA1

      2c2d10c1203a4e18fe912069ab702720239dd00f

      SHA256

      138a262303b34cf0da63a5a8d32217db66f97ef5873dbac0f51ada3659c8cb3f

      SHA512

      9d0a67476039b8f26216af1c9d56c0f0e6a6d4797eab2640e2f1720d0e451ca09459e2293a0dd66f60325688cba17ad82f9b62cb3fabfb118c2f40950168b0e6

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

      Filesize

      183KB

      MD5

      c2302bfa2c8c29f71e98ebf44f33b9a4

      SHA1

      2c2d10c1203a4e18fe912069ab702720239dd00f

      SHA256

      138a262303b34cf0da63a5a8d32217db66f97ef5873dbac0f51ada3659c8cb3f

      SHA512

      9d0a67476039b8f26216af1c9d56c0f0e6a6d4797eab2640e2f1720d0e451ca09459e2293a0dd66f60325688cba17ad82f9b62cb3fabfb118c2f40950168b0e6

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

      Filesize

      183KB

      MD5

      c2302bfa2c8c29f71e98ebf44f33b9a4

      SHA1

      2c2d10c1203a4e18fe912069ab702720239dd00f

      SHA256

      138a262303b34cf0da63a5a8d32217db66f97ef5873dbac0f51ada3659c8cb3f

      SHA512

      9d0a67476039b8f26216af1c9d56c0f0e6a6d4797eab2640e2f1720d0e451ca09459e2293a0dd66f60325688cba17ad82f9b62cb3fabfb118c2f40950168b0e6

    • C:\Users\Admin\AppData\Local\Temp\Cab5E79.tmp

      Filesize

      61KB

      MD5

      fc4666cbca561e864e7fdf883a9e6661

      SHA1

      2f8d6094c7a34bf12ea0bbf0d51ee9c5bb7939a5

      SHA256

      10f3deb6c452d749a7451b5d065f4c0449737e5ee8a44f4d15844b503141e65b

      SHA512

      c71f54b571e01f247f072be4bbebdf5d8410b67eb79a61e7e0d9853fe857ab9bd12f53e6af3394b935560178107291fc4be351b27deb388eba90ba949633d57d

    • C:\Users\Admin\AppData\Local\Temp\Tar5F5A.tmp

      Filesize

      164KB

      MD5

      4ff65ad929cd9a367680e0e5b1c08166

      SHA1

      c0af0d4396bd1f15c45f39d3b849ba444233b3a2

      SHA256

      c8733c93cc5aaf5ca206d06af22ee8dbdec764fb5085019a6a9181feb9dfdee6

      SHA512

      f530dc0d024a5a3b8903ffaaa41b608a5ccdd6da4ba1949f2c2e55a9fca475fec5c8d2119b5763cabe7ef1c3788fb9dcac621869db51d65b1d83cfe404fb4c27

    • C:\Users\Admin\AppData\Local\z2012buvf7\port.dat

      Filesize

      4B

      MD5

      db9e6eef2eb4f0d8c55ecc7beaf2d78d

      SHA1

      0bc1c1892eb176d759fcd45e2c7a5b6f14ddc266

      SHA256

      b444aa2fe427a38887a4c1561234c3ab3cd6ad31b760f04d4ef05fbcb8f7c8a7

      SHA512

      89b704902880bea0a1656fd043d94babfa28921f88987f19c40f03b9370a200df4d64f5c8e907644f69c2a8f6d3b0306e1a84fc66a76f5b8dafa1ebcff1c0712

    • memory/576-131-0x000000001B2E0000-0x000000001B360000-memory.dmp

      Filesize

      512KB

    • memory/576-63-0x000000001B2E0000-0x000000001B360000-memory.dmp

      Filesize

      512KB

    • memory/576-61-0x00000000001E0000-0x0000000000214000-memory.dmp

      Filesize

      208KB

    • memory/836-54-0x0000000000870000-0x00000000008A4000-memory.dmp

      Filesize

      208KB

    • memory/836-55-0x0000000000320000-0x00000000003A0000-memory.dmp

      Filesize

      512KB

    • memory/1288-134-0x000000001A5A0000-0x000000001A620000-memory.dmp

      Filesize

      512KB