Analysis

  • max time kernel
    91s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    21-05-2022 03:32

General

  • Target

    PO.img.jpg.exe

  • Size

    371KB

  • MD5

    05643226c4f1d9116d9cd0bc31f2eea9

  • SHA1

    80e883195c0108a28d79fd638b326ccd4affad19

  • SHA256

    141d8dd9c235560984db345a6414c17c5fed18e5b2106f240a58f3cdcc9f9584

  • SHA512

    8c7d54423af88f7c6a0ced3e5f768a1f72df90b9478fbd4c7903271b1b8adefbc44228e11dcf71ba6e8d07f08d87b3271b6a0e79801ccb0034f47090638757fe

Malware Config

Signatures

  • ISR Stealer

    ISR Stealer is a modified version of Hackhound Stealer written in visual basic.

  • ISR Stealer Payload 3 IoCs
  • NirSoft MailPassView 2 IoCs

    Password recovery tool for various email clients

  • Nirsoft 2 IoCs
  • UPX packed file 4 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs
  • Suspicious use of SetThreadContext 3 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 1 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 26 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\PO.img.jpg.exe
    "C:\Users\Admin\AppData\Local\Temp\PO.img.jpg.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of SetThreadContext
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3996
    • C:\Windows\SysWOW64\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\jrtQOooYewvWK" /XML "C:\Users\Admin\AppData\Local\Temp\tmpDE0C.tmp"
      2⤵
      • Creates scheduled task(s)
      PID:868
    • C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe
      "{path}"
      2⤵
      • Suspicious use of SetThreadContext
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:2748
      • C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe
        /scomma "C:\Users\Admin\AppData\Local\Temp\SqUccPw2Iq.ini"
        3⤵
          PID:3884
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3884 -s 80
            4⤵
            • Program crash
            PID:5076
        • C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegSvcs.exe
          /scomma "C:\Users\Admin\AppData\Local\Temp\8iiQLsBbSw.ini"
          3⤵
          • Accesses Microsoft Outlook accounts
          PID:3956
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 3884 -ip 3884
      1⤵
        PID:440

      Network

      MITRE ATT&CK Enterprise v6

      Replay Monitor

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      Downloads

      • C:\Users\Admin\AppData\Local\Temp\tmpDE0C.tmp

        Filesize

        1KB

        MD5

        5c0cc3e3319c2ba6588c35fcf659b0a2

        SHA1

        84f67c98100ceaf350c05b4514e15b64031ba912

        SHA256

        5ae7cf10fe03202cdaf5e76dec8ca66d37af86760d0c69d5866ba1d5ba72e88a

        SHA512

        05802060bd4b55405a21d8672dc22e67a022f4e15ea8bfe35be05603a19b4e20d183aa06de15957f59b9ace8c06602fd095df57cf2f9da060f88a98c97da0005

      • memory/2748-141-0x0000000000400000-0x0000000000442000-memory.dmp

        Filesize

        264KB

      • memory/2748-134-0x0000000000400000-0x0000000000442000-memory.dmp

        Filesize

        264KB

      • memory/2748-136-0x0000000000400000-0x0000000000442000-memory.dmp

        Filesize

        264KB

      • memory/3956-143-0x0000000000400000-0x000000000041F000-memory.dmp

        Filesize

        124KB

      • memory/3956-145-0x0000000000400000-0x000000000041F000-memory.dmp

        Filesize

        124KB

      • memory/3956-146-0x0000000000400000-0x000000000041F000-memory.dmp

        Filesize

        124KB

      • memory/3956-147-0x0000000000400000-0x000000000041F000-memory.dmp

        Filesize

        124KB

      • memory/3996-130-0x0000000075570000-0x0000000075B21000-memory.dmp

        Filesize

        5.7MB