Analysis

  • max time kernel
    151s
  • max time network
    152s
  • platform
    windows7_x64
  • resource
    win7v20201028
  • submitted
    08-03-2021 13:55

General

  • Target

    839609b011f03a293a0573ea5fb1277e.exe

  • Size

    698KB

  • MD5

    839609b011f03a293a0573ea5fb1277e

  • SHA1

    fe48ac0a84e79bc2dd0024e55a62e86b077f8c12

  • SHA256

    d466ef9698569363af4f08b64235817c7838c726c1faee300582aab3d90f5683

  • SHA512

    526f6345e367950bc775213663fd68bd7bae2b82c71df70e8589dccc173da66af0171183c4abc4a102e45e151453ff8a8d67c2e4c8fcf72c54d85def22d37ac4

Malware Config

Signatures

  • Taurus Stealer

    Taurus is an infostealer first seen in June 2020.

  • Vidar

    Vidar is an infostealer based on Arkei stealer.

  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 10 IoCs
  • Modifies file permissions 1 TTPs 1 IoCs
  • Reads user/profile data of local email clients 2 TTPs

    Email clients store some user data on disk where infostealers will often target it.

  • Reads user/profile data of web browsers 2 TTPs

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

  • 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.

  • Looks up external IP address via web service 3 IoCs

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

  • 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 2 IoCs
  • Kills process with taskkill 1 IoCs
  • Modifies system certificate store 2 TTPs 7 IoCs
  • Suspicious behavior: EnumeratesProcesses 8 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of WriteProcessMemory 45 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\839609b011f03a293a0573ea5fb1277e.exe
    "C:\Users\Admin\AppData\Local\Temp\839609b011f03a293a0573ea5fb1277e.exe"
    1⤵
    • Adds Run key to start application
    • Modifies system certificate store
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:1864
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\Users\Admin\AppData\Local\d0dadce5-dd6e-4d37-b70d-ce33db6851ed" /deny *S-1-1-0:(OI)(CI)(DE,DC)
      2⤵
      • Modifies file permissions
      PID:1524
    • C:\Users\Admin\AppData\Local\Temp\839609b011f03a293a0573ea5fb1277e.exe
      "C:\Users\Admin\AppData\Local\Temp\839609b011f03a293a0573ea5fb1277e.exe" --Admin IsNotAutoStart IsNotTask
      2⤵
      • Loads dropped DLL
      • Modifies system certificate store
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:1672
      • C:\Users\Admin\AppData\Local\9b71ef17-d505-47c5-974a-2b31e7c8ae8a\updatewin.exe
        "C:\Users\Admin\AppData\Local\9b71ef17-d505-47c5-974a-2b31e7c8ae8a\updatewin.exe"
        3⤵
        • Executes dropped EXE
        • Loads dropped DLL
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1512
        • C:\Windows\SysWOW64\cmd.exe
          /c timeout /t 3 & del /f /q C:\Users\Admin\AppData\Local\9b71ef17-d505-47c5-974a-2b31e7c8ae8a\updatewin.exe
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:1864
          • C:\Windows\SysWOW64\timeout.exe
            timeout /t 3
            5⤵
            • Delays execution with timeout.exe
            PID:856
      • C:\Users\Admin\AppData\Local\9b71ef17-d505-47c5-974a-2b31e7c8ae8a\5.exe
        "C:\Users\Admin\AppData\Local\9b71ef17-d505-47c5-974a-2b31e7c8ae8a\5.exe"
        3⤵
        • Executes dropped EXE
        • Loads dropped DLL
        • Checks processor information in registry
        • Modifies system certificate store
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of WriteProcessMemory
        PID:1140
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /c taskkill /im 5.exe /f & timeout /t 6 & del /f /q "C:\Users\Admin\AppData\Local\9b71ef17-d505-47c5-974a-2b31e7c8ae8a\5.exe" & del C:\ProgramData\*.dll & exit
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:1264
          • C:\Windows\SysWOW64\taskkill.exe
            taskkill /im 5.exe /f
            5⤵
            • Kills process with taskkill
            • Suspicious use of AdjustPrivilegeToken
            PID:1028
          • C:\Windows\SysWOW64\timeout.exe
            timeout /t 6
            5⤵
            • Delays execution with timeout.exe
            PID:1580

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • memory/1168-6-0x000007FEF7810000-0x000007FEF7A8A000-memory.dmp

    Filesize

    2.5MB

  • memory/1672-10-0x0000000002FA0000-0x0000000002FB1000-memory.dmp

    Filesize

    68KB

  • memory/1672-19-0x0000000000400000-0x0000000000537000-memory.dmp

    Filesize

    1.2MB

  • memory/1864-2-0x0000000002DA0000-0x0000000002DB1000-memory.dmp

    Filesize

    68KB

  • memory/1864-5-0x0000000000400000-0x0000000000537000-memory.dmp

    Filesize

    1.2MB

  • memory/1864-4-0x0000000002DA0000-0x0000000002EBA000-memory.dmp

    Filesize

    1.1MB

  • memory/1864-3-0x00000000760B1000-0x00000000760B3000-memory.dmp

    Filesize

    8KB