Analysis

  • max time kernel
    117s
  • max time network
    120s
  • platform
    windows7_x64
  • resource
    win7-20230712-en
  • resource tags

    arch:x64arch:x86image:win7-20230712-enlocale:en-usos:windows7-x64system
  • submitted
    26-07-2023 13:31

General

  • Target

    build_4.exe

  • Size

    165KB

  • MD5

    547933c1a8ea0eb111e619d70ca2c657

  • SHA1

    aca394a095c3951ace115ac621a67df1ff4d2e33

  • SHA256

    fdc83f58a30b80240c5887c6646324600f3896421059b80caddacfdb196287ea

  • SHA512

    5df1b41c5f19e304cc0758b175252c17cc6ccb1d3d91ba2f153138dfbd8e2ef3cd6efe8a136559c55952bdb43a7f206f7ba4e04674ee95363ca8409e48745c2b

  • SSDEEP

    1536:ROwwIJbzij3pPEOGFmd8Szav8IDYFUxT1DR5jPVSBSVG41AG9wL4yXacCwPIC6Xi:RyIlz2p8Yai3GNzDeeb4FzeDGwKSHqj

Score
10/10

Malware Config

Extracted

Family

gurcu

C2

https://api.telegram.org/bot6193093056:AAHzyNGUGS9aUG6CCx6ENLoXpCFLzEQywIQ/sendMessage?chat_id=1098292643

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.

  • 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.

Processes

  • C:\Users\Admin\AppData\Local\Temp\build_4.exe
    "C:\Users\Admin\AppData\Local\Temp\build_4.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2060
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "build_4" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\build_4.exe" &&START "" "C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe"
      2⤵
      • Deletes itself
      • Suspicious use of WriteProcessMemory
      PID:1952
      • C:\Windows\system32\chcp.com
        chcp 65001
        3⤵
          PID:2908
        • C:\Windows\system32\PING.EXE
          ping 127.0.0.1
          3⤵
          • Runs ping.exe
          PID:2508
        • C:\Windows\system32\schtasks.exe
          schtasks /create /tn "build_4" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe" /rl HIGHEST /f
          3⤵
          • Creates scheduled task(s)
          PID:2948
        • C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe
          "C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe"
          3⤵
          • Executes dropped EXE
          • Modifies system certificate store
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:3016
          • C:\Windows\system32\WerFault.exe
            C:\Windows\system32\WerFault.exe -u -p 3016 -s 1740
            4⤵
            • Program crash
            PID:844
    • C:\Windows\system32\taskeng.exe
      taskeng.exe {8067DBAA-68F4-4A35-97EC-CD9B2D7C45E0} S-1-5-21-4219371764-2579186923-3390623117-1000:NVACMPYA\Admin:Interactive:[1]
      1⤵
      • Suspicious use of WriteProcessMemory
      PID:1856
      • C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe
        C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe
        2⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2312
        • C:\Windows\system32\WerFault.exe
          C:\Windows\system32\WerFault.exe -u -p 2312 -s 1700
          3⤵
          • Program crash
          PID:2032

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

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

      Filesize

      344B

      MD5

      369eb93a63c2c39eecf3c9f560d17942

      SHA1

      755373bd82048e005d30eda89acae88549062dea

      SHA256

      62e09dd6864817b58f490317eeb9acfa39d6b127c2fad4874398c1476ed8c7ee

      SHA512

      9ee13d121aa926a02e577a51ff503dac95bbf9165f13c1e5821aa441cdb2d63b0d471fe46a37784992e45eb3400b74bcd698b81b67b86b600e7db3bc239aa143

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

      Filesize

      344B

      MD5

      74edd19a830587326b5409d98cb5a636

      SHA1

      abed10f930b411f908f504b1f3cf8f9c742a4bc9

      SHA256

      d133948c45a322ff6f0413f4d88e8747b822faa224c6ccef8807ff32bcd5657f

      SHA512

      c2a60c9e683c1e3162aa5013be1c356e8a523d8a88509a84db2d3e6e4574b9fb74ba96acda1786fec0b23bf2e97400c2e0759bbbdd4de43123af52069fd9a773

    • C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe

      Filesize

      165KB

      MD5

      547933c1a8ea0eb111e619d70ca2c657

      SHA1

      aca394a095c3951ace115ac621a67df1ff4d2e33

      SHA256

      fdc83f58a30b80240c5887c6646324600f3896421059b80caddacfdb196287ea

      SHA512

      5df1b41c5f19e304cc0758b175252c17cc6ccb1d3d91ba2f153138dfbd8e2ef3cd6efe8a136559c55952bdb43a7f206f7ba4e04674ee95363ca8409e48745c2b

    • C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe

      Filesize

      165KB

      MD5

      547933c1a8ea0eb111e619d70ca2c657

      SHA1

      aca394a095c3951ace115ac621a67df1ff4d2e33

      SHA256

      fdc83f58a30b80240c5887c6646324600f3896421059b80caddacfdb196287ea

      SHA512

      5df1b41c5f19e304cc0758b175252c17cc6ccb1d3d91ba2f153138dfbd8e2ef3cd6efe8a136559c55952bdb43a7f206f7ba4e04674ee95363ca8409e48745c2b

    • C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe

      Filesize

      165KB

      MD5

      547933c1a8ea0eb111e619d70ca2c657

      SHA1

      aca394a095c3951ace115ac621a67df1ff4d2e33

      SHA256

      fdc83f58a30b80240c5887c6646324600f3896421059b80caddacfdb196287ea

      SHA512

      5df1b41c5f19e304cc0758b175252c17cc6ccb1d3d91ba2f153138dfbd8e2ef3cd6efe8a136559c55952bdb43a7f206f7ba4e04674ee95363ca8409e48745c2b

    • C:\Users\Admin\AppData\Local\Temp\Cab984C.tmp

      Filesize

      62KB

      MD5

      3ac860860707baaf32469fa7cc7c0192

      SHA1

      c33c2acdaba0e6fa41fd2f00f186804722477639

      SHA256

      d015145d551ecd14916270efad773bbc9fd57fad2228d2c24559f696c961d904

      SHA512

      d62ad2408c969a95550fb87efda50f988770ba5e39972041bf85924275baf156b8bec309ecc6409e5acdd37ec175dea40eff921ab58933b5b5b5d35a6147567c

    • C:\Users\Admin\AppData\Local\Temp\Tar9A91.tmp

      Filesize

      164KB

      MD5

      4ff65ad929cd9a367680e0e5b1c08166

      SHA1

      c0af0d4396bd1f15c45f39d3b849ba444233b3a2

      SHA256

      c8733c93cc5aaf5ca206d06af22ee8dbdec764fb5085019a6a9181feb9dfdee6

      SHA512

      f530dc0d024a5a3b8903ffaaa41b608a5ccdd6da4ba1949f2c2e55a9fca475fec5c8d2119b5763cabe7ef1c3788fb9dcac621869db51d65b1d83cfe404fb4c27

    • C:\Users\Admin\AppData\Local\d92pmiifqt\port.dat

      Filesize

      4B

      MD5

      11d867796d85db8cad5280ac44cec7c1

      SHA1

      0a13a10c21102ee6ee57c9095dd9b323f678ea11

      SHA256

      7ef4694c838dc3db5176c6531eeb3f9290e229b4ed08f83100c809fbc1ee7b73

      SHA512

      5c870ac28198460bd4fea1a4592ecaf520039e652f27ae53e40fc36c6b477d7c8fb0dfcffbfac70f7e6cce1dc772dd0dea33ca6a5781823864da8140f1eb44e1

    • memory/2060-54-0x0000000000B10000-0x0000000000B40000-memory.dmp

      Filesize

      192KB

    • memory/2060-59-0x000007FEF5210000-0x000007FEF5BFC000-memory.dmp

      Filesize

      9.9MB

    • memory/2060-56-0x000000001B0E0000-0x000000001B160000-memory.dmp

      Filesize

      512KB

    • memory/2060-55-0x000007FEF5210000-0x000007FEF5BFC000-memory.dmp

      Filesize

      9.9MB

    • memory/2312-131-0x000007FEF4820000-0x000007FEF520C000-memory.dmp

      Filesize

      9.9MB

    • memory/2312-132-0x000000001B050000-0x000000001B0D0000-memory.dmp

      Filesize

      512KB

    • memory/2312-153-0x000007FEF4820000-0x000007FEF520C000-memory.dmp

      Filesize

      9.9MB

    • memory/2312-154-0x000000001B050000-0x000000001B0D0000-memory.dmp

      Filesize

      512KB

    • memory/3016-63-0x0000000000050000-0x0000000000080000-memory.dmp

      Filesize

      192KB

    • memory/3016-64-0x000007FEF4820000-0x000007FEF520C000-memory.dmp

      Filesize

      9.9MB

    • memory/3016-130-0x000007FEF4820000-0x000007FEF520C000-memory.dmp

      Filesize

      9.9MB

    • memory/3016-65-0x000000001B050000-0x000000001B0D0000-memory.dmp

      Filesize

      512KB

    • memory/3016-134-0x000000001B050000-0x000000001B0D0000-memory.dmp

      Filesize

      512KB