Analysis

  • max time kernel
    70s
  • max time network
    74s
  • platform
    windows7_x64
  • resource
    win7
  • submitted
    07-07-2020 18:04

General

  • Target

    kcfff.exe

  • Size

    1.2MB

  • MD5

    71e21f88a8027b66d18aefd18eb97da7

  • SHA1

    2436535f99b2ecce872f60552742d845eeb75863

  • SHA256

    31158724133cf00916cca2eb89ed79d453f1c9210cd79dbafaafcbc2eadba065

  • SHA512

    3f8a32c729d470c94e085a98a0a2b3972a0682773fc51a8a65ce18d8861ea99c8177e13f448c1066627c750725938917c47d30f04a61fd9ce1505ac213cc2f5b

Malware Config

Signatures

  • 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 behavior: EnumeratesProcesses 7 IoCs
  • Suspicious use of WriteProcessMemory 24 IoCs
  • Loads dropped DLL 2 IoCs
  • MassLogger log file 1 IoCs

    Detects a log file produced by MassLogger.

  • Reads user/profile data of web browsers 2 TTPs

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

  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Executes dropped EXE 2 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Adds Run entry to start application 2 TTPs 2 IoCs
  • MassLogger

    Masslogger is a .NET stealer targeting passwords from browsers, email and cryptocurrency clients.

Processes

  • C:\Users\Admin\AppData\Local\Temp\kcfff.exe
    "C:\Users\Admin\AppData\Local\Temp\kcfff.exe"
    1⤵
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    • Loads dropped DLL
    • Suspicious use of AdjustPrivilegeToken
    PID:1132
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c REG ADD HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run /f /v appd /t REG_SZ /d C:\Windows\system32\pcalua.exe" -a C:\Users\Admin\portyu.exe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1504
      • C:\Windows\SysWOW64\reg.exe
        REG ADD HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run /f /v appd /t REG_SZ /d C:\Windows\system32\pcalua.exe" -a C:\Users\Admin\portyu.exe"
        3⤵
        • Adds Run entry to start application
        PID:1612
    • C:\Users\Admin\portyu.exe
      "C:\Users\Admin\portyu.exe"
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      • Loads dropped DLL
      • Suspicious use of AdjustPrivilegeToken
      • Executes dropped EXE
      • Suspicious use of SetThreadContext
      PID:360
      • C:\Users\Admin\AppData\Local\Temp\InstallUtil.exe
        "C:\Users\Admin\AppData\Local\Temp\InstallUtil.exe"
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Executes dropped EXE
        PID:1400

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Temp\InstallUtil.exe

  • C:\Users\Admin\AppData\Local\Temp\InstallUtil.exe

  • C:\Users\Admin\portyu.exe

  • C:\Users\Admin\portyu.exe

  • \Users\Admin\AppData\Local\Temp\InstallUtil.exe

  • \Users\Admin\portyu.exe

  • memory/360-6-0x0000000000000000-mapping.dmp

  • memory/1132-1-0x0000000000000000-0x0000000000000000-disk.dmp

  • memory/1400-14-0x0000000000400000-0x000000000049A000-memory.dmp

    Filesize

    616KB

  • memory/1400-15-0x00000000004945DE-mapping.dmp

  • memory/1400-17-0x0000000000400000-0x000000000049A000-memory.dmp

    Filesize

    616KB

  • memory/1400-18-0x0000000000400000-0x000000000049A000-memory.dmp

    Filesize

    616KB

  • memory/1504-3-0x0000000000000000-mapping.dmp

  • memory/1612-4-0x0000000000000000-mapping.dmp