Analysis

  • max time kernel
    120s
  • max time network
    119s
  • platform
    windows7_x64
  • resource
    win7-20220414-en
  • submitted
    19/04/2022, 07:34

General

  • Target

    a2c6f733cee76e07ef2fe055e20bafcf443c5f22a2b97bf92cc84e608cc53d58.exe

  • Size

    271KB

  • MD5

    807ed826f4e5564dea3731f6e9a99da5

  • SHA1

    6af26593b27ce7e5c8140ac437801893f9c4cdd6

  • SHA256

    a2c6f733cee76e07ef2fe055e20bafcf443c5f22a2b97bf92cc84e608cc53d58

  • SHA512

    46216db616ec8067cb1a375e6df281402f19a3c4cfcc4821143fbbbf0d2a94b8333dccd6ddccc12a0ddfdf5ab762baf2467b47cd67e0b0f67d531fc8bac982e7

Malware Config

Extracted

Family

arkei

Botnet

Default

C2

http://jsdkci.link/588711.php

Signatures

  • Arkei

    Arkei is an infostealer written in C++.

  • Deletes itself 1 IoCs
  • Loads dropped DLL 2 IoCs
  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • Suspicious use of SetThreadContext 1 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Checks processor information in registry 2 TTPs 2 IoCs

    Processor information is often read in order to detect sandboxing environments.

  • Delays execution with timeout.exe 1 IoCs
  • Suspicious use of WriteProcessMemory 18 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\a2c6f733cee76e07ef2fe055e20bafcf443c5f22a2b97bf92cc84e608cc53d58.exe
    "C:\Users\Admin\AppData\Local\Temp\a2c6f733cee76e07ef2fe055e20bafcf443c5f22a2b97bf92cc84e608cc53d58.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:388
    • C:\Users\Admin\AppData\Local\Temp\a2c6f733cee76e07ef2fe055e20bafcf443c5f22a2b97bf92cc84e608cc53d58.exe
      "C:\Users\Admin\AppData\Local\Temp\a2c6f733cee76e07ef2fe055e20bafcf443c5f22a2b97bf92cc84e608cc53d58.exe"
      2⤵
      • Loads dropped DLL
      • Checks processor information in registry
      • Suspicious use of WriteProcessMemory
      PID:556
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /c timeout /t 5 & del /f /q "C:\Users\Admin\AppData\Local\Temp\a2c6f733cee76e07ef2fe055e20bafcf443c5f22a2b97bf92cc84e608cc53d58.exe" & exit
        3⤵
        • Deletes itself
        • Suspicious use of WriteProcessMemory
        PID:524
        • C:\Windows\SysWOW64\timeout.exe
          timeout /t 5
          4⤵
          • Delays execution with timeout.exe
          PID:1804

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

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        Downloads

        • \ProgramData\mozglue.dll

          Filesize

          133KB

          MD5

          8f73c08a9660691143661bf7332c3c27

          SHA1

          37fa65dd737c50fda710fdbde89e51374d0c204a

          SHA256

          3fe6b1c54b8cf28f571e0c5d6636b4069a8ab00b4f11dd842cfec00691d0c9cd

          SHA512

          0042ecf9b3571bb5eba2de893e8b2371df18f7c5a589f52ee66e4bfbaa15a5b8b7cc6a155792aaa8988528c27196896d5e82e1751c998bacea0d92395f66ad89

        • \ProgramData\nss3.dll

          Filesize

          1.2MB

          MD5

          bfac4e3c5908856ba17d41edcd455a51

          SHA1

          8eec7e888767aa9e4cca8ff246eb2aacb9170428

          SHA256

          e2935b5b28550d47dc971f456d6961f20d1633b4892998750140e0eaa9ae9d78

          SHA512

          2565bab776c4d732ffb1f9b415992a4c65b81bcd644a9a1df1333a269e322925fc1df4f76913463296efd7c88ef194c3056de2f1ca1357d7b5fe5ff0da877a66

        • memory/388-57-0x00000000005FF000-0x0000000000617000-memory.dmp

          Filesize

          96KB

        • memory/388-59-0x0000000000220000-0x0000000000249000-memory.dmp

          Filesize

          164KB

        • memory/556-54-0x0000000000400000-0x000000000043C000-memory.dmp

          Filesize

          240KB

        • memory/556-58-0x0000000000400000-0x000000000043C000-memory.dmp

          Filesize

          240KB

        • memory/556-60-0x0000000000400000-0x000000000043C000-memory.dmp

          Filesize

          240KB

        • memory/556-61-0x0000000076C81000-0x0000000076C83000-memory.dmp

          Filesize

          8KB

        • memory/556-62-0x0000000060900000-0x0000000060992000-memory.dmp

          Filesize

          584KB