Analysis

  • max time kernel
    147s
  • max time network
    165s
  • platform
    windows10_x64
  • resource
    win10v20210410
  • submitted
    20/06/2021, 08:51

General

  • Target
    BC8478F5CAA7B719234C8E1CF8395B12.exe
  • Size 10.7MB
  • Sample210620-13g2cn2bpa
  • SHA256 f5a558eba4843612e1b2e7bbfb431932a94bdc86f9411c0529f4216bcfe0ef02
  • MD5 SHA1 SHA512

Malware Config

Extracted

Family
  • quasar

Version
  • 1.4.0.0

Botnet
  • Office

C2
  • 5.61.62.193:5552

Mutex
  • yeGmQfVnPgbImyPaxF

Attributes
  • encryption_key

    NW9ZIW6yy48cx5RgKTcR

  • install_name

    csrss.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    NET framework

  • subdirectory

    SubDir

Signatures

  • Quasar Payload 3 IoCs
  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • RedLine

    RedLine Stealer is a malware family written in C#, first appearing in early 2020.

  • RedLine Payload 1 IoCs
  • Downloads MZ/PE file
  • Executes dropped EXE 12 IoCs
  • Drops startup file 1 IoCs
  • Loads dropped DLL 1 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.

  • Legitimate hosting services abused for malware hosting/C2 1 TTPs
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Suspicious use of NtSetInformationThreadHideFromDebugger 16 IoCs
  • Suspicious use of SetThreadContext 2 IoCs
  • Drops file in Program Files directory 6 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Runs ping.exe 1 TTPs 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\BC8478F5CAA7B719234C8E1CF8395B12.exe
    "C:\Users\Admin\AppData\Local\Temp\BC8478F5CAA7B719234C8E1CF8395B12.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:3944
    • C:\Users\Admin\AppData\Local\Temp\is-CM581.tmp\BC8478F5CAA7B719234C8E1CF8395B12.tmp
      "C:\Users\Admin\AppData\Local\Temp\is-CM581.tmp\BC8478F5CAA7B719234C8E1CF8395B12.tmp" /SL5="$5006A,10346497,792064,C:\Users\Admin\AppData\Local\Temp\BC8478F5CAA7B719234C8E1CF8395B12.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of WriteProcessMemory
      PID:1916
      • C:\Users\Admin\AppData\Local\Temp\BC8478F5CAA7B719234C8E1CF8395B12.exe
        "C:\Users\Admin\AppData\Local\Temp\BC8478F5CAA7B719234C8E1CF8395B12.exe" /VERYSILENT
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:4012
        • C:\Users\Admin\AppData\Local\Temp\is-8PL14.tmp\BC8478F5CAA7B719234C8E1CF8395B12.tmp
          "C:\Users\Admin\AppData\Local\Temp\is-8PL14.tmp\BC8478F5CAA7B719234C8E1CF8395B12.tmp" /SL5="$501E0,10346497,792064,C:\Users\Admin\AppData\Local\Temp\BC8478F5CAA7B719234C8E1CF8395B12.exe" /VERYSILENT
          4⤵
          • Executes dropped EXE
          • Drops file in Program Files directory
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of FindShellTrayWindow
          • Suspicious use of WriteProcessMemory
          PID:2940
          • C:\Program Files (x86)\My Program\SRBPolaris.exe
            "C:\Program Files (x86)\My Program\SRBPolaris.exe" C:\Program Files (x86)\My Program\SRBPolaris.exe
            5⤵
            • Executes dropped EXE
            • Suspicious use of NtSetInformationThreadHideFromDebugger
            PID:1960
          • C:\Program Files (x86)\My Program\driv.exe
            "C:\Program Files (x86)\My Program\driv.exe" C:\Program Files (x86)\My Program\driv.exe
            5⤵
            • Executes dropped EXE
            • Loads dropped DLL
            • Suspicious use of WriteProcessMemory
            PID:2808
            • C:\Users\Admin\AppData\Local\Temp\CCLI.exe
              "C:\Users\Admin\AppData\Local\Temp/CCLI.exe"
              6⤵
              • Executes dropped EXE
              • Suspicious use of WriteProcessMemory
              PID:2120
              • C:\Windows\SysWOW64\cmd.exe
                "C:\Windows\System32\cmd.exe" /c cmd < Voi.dot
                7⤵
                • Suspicious use of WriteProcessMemory
                PID:644
                • C:\Windows\SysWOW64\cmd.exe
                  cmd
                  8⤵
                  • Suspicious use of WriteProcessMemory
                  PID:212
                  • C:\Windows\SysWOW64\findstr.exe
                    findstr /V /R "^HXrmvNHDBkDgGNeExKVqLRIadYrxdOqbTpPwxrWDCUKCBwsXIMZofaNQgKpnJhhNkuxvYqpdOabRuyQgGuLEOSoBcZMJUbTfHXscHUZICJzXUWJoTV$" Mano.dot
                    9⤵
                      PID:2040
                    • C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Velavi.exe.com
                      Velavi.exe.com c
                      9⤵
                      • Executes dropped EXE
                      • Suspicious use of WriteProcessMemory
                      PID:4028
                      • C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Velavi.exe.com
                        C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\Velavi.exe.com c
                        10⤵
                        • Executes dropped EXE
                        • Drops startup file
                        • Suspicious use of SetThreadContext
                        • Suspicious use of WriteProcessMemory
                        PID:2200
                        • C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\RegAsm.exe
                          C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\RegAsm.exe
                          11⤵
                          • Executes dropped EXE
                          • Suspicious use of AdjustPrivilegeToken
                          • Suspicious use of SetWindowsHookEx
                          PID:2008
                    • C:\Windows\SysWOW64\PING.EXE
                      ping 127.0.0.1 -n 30
                      9⤵
                      • Runs ping.exe
                      PID:1408
              • C:\Users\Admin\AppData\Local\Temp\ref.exe
                "C:\Users\Admin\AppData\Local\Temp/ref.exe"
                6⤵
                • Executes dropped EXE
                • Suspicious use of WriteProcessMemory
                PID:688
                • C:\Windows\SysWOW64\cmd.exe
                  "C:\Windows\System32\cmd.exe" /c cmd < Corano.aifc
                  7⤵
                  • Suspicious use of WriteProcessMemory
                  PID:3024
                  • C:\Windows\SysWOW64\cmd.exe
                    cmd
                    8⤵
                    • Suspicious use of WriteProcessMemory
                    PID:2108
                    • C:\Windows\SysWOW64\findstr.exe
                      findstr /V /R "^LMdBvAYUmwcKFMhAjjYLBfAXPEJldHxpVjTUoafXpqEdNzGoOjdzbgUvjzMSROERGjPzTzsUXwCBKllvXAcrsqLHsbIPFbyxcMJAEhfxUcvcM$" Melagrani.aifc
                      9⤵
                        PID:2308
                      • C:\Users\Admin\AppData\Local\Temp\7ZipSfx.001\Rivederlo.exe.com
                        Rivederlo.exe.com A
                        9⤵
                        • Executes dropped EXE
                        • Suspicious use of WriteProcessMemory
                        PID:3064
                        • C:\Users\Admin\AppData\Local\Temp\7ZipSfx.001\Rivederlo.exe.com
                          C:\Users\Admin\AppData\Local\Temp\7ZipSfx.001\Rivederlo.exe.com A
                          10⤵
                          • Executes dropped EXE
                          • Suspicious use of SetThreadContext
                          • Suspicious use of WriteProcessMemory
                          PID:3468
                          • C:\Users\Admin\AppData\Local\Temp\7ZipSfx.001\RegAsm.exe
                            C:\Users\Admin\AppData\Local\Temp\7ZipSfx.001\RegAsm.exe
                            11⤵
                            • Executes dropped EXE
                            • Suspicious behavior: EnumeratesProcesses
                            • Suspicious use of AdjustPrivilegeToken
                            PID:780
                      • C:\Windows\SysWOW64\PING.EXE
                        ping 127.0.0.1 -n 30
                        9⤵
                        • Runs ping.exe
                        PID:2184

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            memory/780-229-0x0000000006400000-0x0000000006401000-memory.dmp

            memory/780-217-0x00000000003A0000-0x00000000003BE000-memory.dmp

            memory/780-222-0x0000000005160000-0x0000000005161000-memory.dmp

            memory/780-223-0x00000000024F0000-0x00000000024F1000-memory.dmp

            memory/780-226-0x0000000004BD0000-0x0000000004BD1000-memory.dmp

            memory/780-227-0x0000000004E10000-0x0000000004E11000-memory.dmp

            memory/780-228-0x0000000005D00000-0x0000000005D01000-memory.dmp

            memory/1916-120-0x0000000000870000-0x0000000000871000-memory.dmp

            memory/1960-142-0x00007FFE34DA0000-0x00007FFE34DB0000-memory.dmp

            memory/1960-139-0x00007FFE34DA0000-0x00007FFE34DB0000-memory.dmp

            memory/1960-163-0x00007FFDB5DB0000-0x00007FFDB5DC0000-memory.dmp

            memory/1960-164-0x00007FFE34FD0000-0x00007FFE34FE0000-memory.dmp

            memory/1960-165-0x0000000000CA0000-0x0000000000CA2000-memory.dmp

            memory/1960-161-0x00007FFE34E50000-0x00007FFE34E60000-memory.dmp

            memory/1960-148-0x00007FFE34DA0000-0x00007FFE34DB0000-memory.dmp

            memory/1960-147-0x00007FFE34DA0000-0x00007FFE34DB0000-memory.dmp

            memory/1960-160-0x00007FFE34E50000-0x00007FFE34E60000-memory.dmp

            memory/1960-159-0x00007FFE34DA0000-0x00007FFE34DB0000-memory.dmp

            memory/1960-145-0x00007FFE34DA0000-0x00007FFE34DB0000-memory.dmp

            memory/1960-150-0x00007FFE34DA0000-0x00007FFE34DB0000-memory.dmp

            memory/1960-158-0x00007FFE34DA0000-0x00007FFE34DB0000-memory.dmp

            memory/1960-146-0x00007FFE34DA0000-0x00007FFE34DB0000-memory.dmp

            memory/1960-144-0x00007FFE34DA0000-0x00007FFE34DB0000-memory.dmp

            memory/1960-157-0x00007FFE34DA0000-0x00007FFE34DB0000-memory.dmp

            memory/1960-143-0x00007FFE34DA0000-0x00007FFE34DB0000-memory.dmp

            memory/1960-156-0x00007FFE34DA0000-0x00007FFE34DB0000-memory.dmp

            memory/1960-180-0x0000000000CA2000-0x0000000000CA4000-memory.dmp

            memory/1960-141-0x00007FFE34DA0000-0x00007FFE34DB0000-memory.dmp

            memory/1960-182-0x0000000000CA4000-0x0000000000CA5000-memory.dmp

            memory/1960-140-0x00007FFE34DA0000-0x00007FFE34DB0000-memory.dmp

            memory/1960-162-0x00007FF686430000-0x00007FF6870B0000-memory.dmp

            memory/1960-149-0x00007FFE34DA0000-0x00007FFE34DB0000-memory.dmp

            memory/1960-155-0x00007FFE34DA0000-0x00007FFE34DB0000-memory.dmp

            memory/1960-138-0x00007FFE34DA0000-0x00007FFE34DB0000-memory.dmp

            memory/1960-154-0x00007FFE34DA0000-0x00007FFE34DB0000-memory.dmp

            memory/1960-153-0x00007FFE34DA0000-0x00007FFE34DB0000-memory.dmp

            memory/1960-137-0x00007FFE34DA0000-0x00007FFE34DB0000-memory.dmp

            memory/1960-136-0x00007FFE34DA0000-0x00007FFE34DB0000-memory.dmp

            memory/1960-135-0x00007FFE34DA0000-0x00007FFE34DB0000-memory.dmp

            memory/1960-152-0x00007FFE34DA0000-0x00007FFE34DB0000-memory.dmp

            memory/1960-151-0x00007FFE34DA0000-0x00007FFE34DB0000-memory.dmp

            memory/1960-134-0x00007FF685300000-0x00007FF6856D1000-memory.dmp

            memory/1960-133-0x00007FFE34DA0000-0x00007FFE34DB0000-memory.dmp

            memory/1960-199-0x0000000000CA5000-0x0000000000CA7000-memory.dmp

            memory/2008-214-0x0000000006280000-0x0000000006281000-memory.dmp

            memory/2008-215-0x00000000065F0000-0x00000000065F1000-memory.dmp

            memory/2008-209-0x0000000005410000-0x0000000005411000-memory.dmp

            memory/2008-213-0x0000000005E90000-0x0000000005E91000-memory.dmp

            memory/2008-212-0x0000000005330000-0x0000000005331000-memory.dmp

            memory/2008-211-0x0000000004F10000-0x000000000540E000-memory.dmp

            memory/2008-204-0x0000000000740000-0x000000000078E000-memory.dmp

            memory/2008-210-0x0000000005020000-0x0000000005021000-memory.dmp

            memory/2200-202-0x00000000009B0000-0x00000000009B1000-memory.dmp

            memory/2940-124-0x0000000000980000-0x0000000000981000-memory.dmp

            memory/3468-216-0x00000000011A0000-0x000000000124E000-memory.dmp

            memory/3944-114-0x0000000000400000-0x00000000004CF000-memory.dmp

            memory/4012-119-0x0000000000400000-0x00000000004CF000-memory.dmp