Analysis

  • max time kernel
    126s
  • max time network
    131s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    19/04/2022, 04:49

General

  • Target

    zxcv.exe

  • Size

    100KB

  • MD5

    c7a310982da68b10360854f9cd78e718

  • SHA1

    60140c28e0b7db797a771c2dee081fa3812246db

  • SHA256

    df4876573295b4e7beb618db31a015ea617f61b811978bb168d432c4052f7731

  • SHA512

    6747fa3f7637922eeaa0feeb25d430dc6ab66fd9f3d22e7e5fd16bad9b75528a8174c34a8baf681950b64e8cdaa6a14e37633592e843c363e75468622ebd2ec3

Malware Config

Extracted

Family

arkei

Botnet

Default

Signatures

  • Arkei

    Arkei is an infostealer written in C++.

  • suricata: ET MALWARE Base64 Encoded Stealer Config from Server - APPDATA Environment Variable M4

    suricata: ET MALWARE Base64 Encoded Stealer Config from Server - APPDATA Environment Variable M4

  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Loads dropped DLL 2 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Program crash 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 6 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 13 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\zxcv.exe
    "C:\Users\Admin\AppData\Local\Temp\zxcv.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of SetThreadContext
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1268
    • C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
      C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
      2⤵
        PID:860
      • C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
        C:\Windows\Microsoft.NET\Framework\v4.0.30319\MSBuild.exe
        2⤵
        • Loads dropped DLL
        PID:4028
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4028 -s 1344
          3⤵
          • Program crash
          PID:668
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 424 -p 4028 -ip 4028
      1⤵
        PID:2808

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            • C:\ProgramData\mozglue.dll

              Filesize

              133KB

              MD5

              8f73c08a9660691143661bf7332c3c27

              SHA1

              37fa65dd737c50fda710fdbde89e51374d0c204a

              SHA256

              3fe6b1c54b8cf28f571e0c5d6636b4069a8ab00b4f11dd842cfec00691d0c9cd

              SHA512

              0042ecf9b3571bb5eba2de893e8b2371df18f7c5a589f52ee66e4bfbaa15a5b8b7cc6a155792aaa8988528c27196896d5e82e1751c998bacea0d92395f66ad89

            • C:\ProgramData\nss3.dll

              Filesize

              1.2MB

              MD5

              bfac4e3c5908856ba17d41edcd455a51

              SHA1

              8eec7e888767aa9e4cca8ff246eb2aacb9170428

              SHA256

              e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78

              SHA512

              2565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66

            • memory/1268-133-0x0000000000440000-0x000000000045E000-memory.dmp

              Filesize

              120KB

            • memory/1268-134-0x00000000053D0000-0x0000000005974000-memory.dmp

              Filesize

              5.6MB

            • memory/1268-135-0x0000000004EC0000-0x0000000004F52000-memory.dmp

              Filesize

              584KB

            • memory/1268-136-0x00000000029C0000-0x00000000029CA000-memory.dmp

              Filesize

              40KB

            • memory/4028-139-0x0000000000400000-0x000000000043D000-memory.dmp

              Filesize

              244KB

            • memory/4028-141-0x0000000000400000-0x000000000043D000-memory.dmp

              Filesize

              244KB

            • memory/4028-142-0x0000000000400000-0x000000000043D000-memory.dmp

              Filesize

              244KB

            • memory/4028-143-0x0000000060900000-0x0000000060992000-memory.dmp

              Filesize

              584KB