Analysis

  • max time kernel
    187s
  • max time network
    208s
  • platform
    windows7_x64
  • resource
    win7-20220414-en
  • submitted
    20-05-2022 05:53

General

  • Target

    e2ea7f9581a7e1386fc6601d1421e1194373c1c891f2d406de6d49810fcc7737.exe

  • Size

    390KB

  • MD5

    b6cc1e4052f613e15a8b05439f5877b4

  • SHA1

    9bb3cb5080ae18985d93a28faeca6ae06d768b21

  • SHA256

    e2ea7f9581a7e1386fc6601d1421e1194373c1c891f2d406de6d49810fcc7737

  • SHA512

    cd48f448cd355a1463ca090d8ad47100596e1ed1a1a771f26c672406669433e9d9d915268def0aad844511f65a3c69fbb3ab2e2dc610ecc0f66a8524a6a8ea73

Malware Config

Signatures

  • Mimikatz

    mimikatz is an open source tool to dump credentials on Windows.

  • mimikatz is an open source tool to dump credentials on Windows 4 IoCs
  • Executes dropped EXE 1 IoCs
  • Loads dropped DLL 3 IoCs
  • Reads user/profile data of web browsers 2 TTPs

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

  • Writes to the Master Boot Record (MBR) 1 TTPs 1 IoCs

    Bootkits write to the MBR to gain persistence at a level below the operating system.

  • Drops file in Program Files directory 64 IoCs
  • Drops file in Windows directory 4 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • 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 6 IoCs
  • Suspicious use of AdjustPrivilegeToken 4 IoCs
  • Suspicious use of WriteProcessMemory 19 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\e2ea7f9581a7e1386fc6601d1421e1194373c1c891f2d406de6d49810fcc7737.exe
    "C:\Users\Admin\AppData\Local\Temp\e2ea7f9581a7e1386fc6601d1421e1194373c1c891f2d406de6d49810fcc7737.exe"
    1⤵
    • Drops file in Windows directory
    • Suspicious use of WriteProcessMemory
    PID:1660
    • C:\Windows\SysWOW64\rundll32.exe
      "C:\Windows\System32\rundll32.exe" C:\Windows\perfc.dat #1
      2⤵
      • Loads dropped DLL
      • Writes to the Master Boot Record (MBR)
      • Drops file in Program Files directory
      • Drops file in Windows directory
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1200
      • C:\Windows\SysWOW64\cmd.exe
        /c schtasks /Create /SC once /TN "" /TR "C:\Windows\system32\shutdown.exe /r /f" /ST 09:40
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:1724
        • C:\Windows\SysWOW64\schtasks.exe
          schtasks /Create /SC once /TN "" /TR "C:\Windows\system32\shutdown.exe /r /f" /ST 09:40
          4⤵
          • Creates scheduled task(s)
          PID:600
      • C:\Users\Admin\AppData\Local\Temp\C5DF.tmp
        "C:\Users\Admin\AppData\Local\Temp\C5DF.tmp" \\.\pipe\{851E8B18-E140-437E-9272-7D7A031CD9C1}
        3⤵
        • Executes dropped EXE
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:1232

Network

MITRE ATT&CK Matrix ATT&CK v6

Execution

Scheduled Task

1
T1053

Persistence

Bootkit

1
T1067

Scheduled Task

1
T1053

Privilege Escalation

Scheduled Task

1
T1053

Credential Access

Credentials in Files

1
T1081

Discovery

System Information Discovery

1
T1082

Collection

Data from Local System

1
T1005

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Users\Admin\AppData\Local\Temp\C5DF.tmp
    Filesize

    55KB

    MD5

    7e37ab34ecdcc3e77e24522ddfd4852d

    SHA1

    38e2855e11e353cedf9a8a4f2f2747f1c5c07fcf

    SHA256

    02ef73bd2458627ed7b397ec26ee2de2e92c71a0e7588f78734761d8edbdcd9f

    SHA512

    1b037a2aa8bf951d2ffe2f724aa0b2fbb39c2173215806ba0327bda7b096301d887f9bb7db46f9e04584b16aa6b1aaeaf67f0ecf5f20eb02ceac27c8753ca587

  • C:\Windows\perfc.dat
    Filesize

    353KB

    MD5

    71b6a493388e7d0b40c83ce903bc6b04

    SHA1

    34f917aaba5684fbe56d3c57d48ef2a1aa7cf06d

    SHA256

    027cc450ef5f8c5f653329641ec1fed91f694e0d229928963b30f6b0d7d3a745

    SHA512

    072205eca5099d9269f358fe534b370ff21a4f12d7938d6d2e2713f69310f0698e53b8aff062849f0b2a521f68bee097c1840993825d2a5a3aa8cf4145911c6f

  • \Users\Admin\AppData\Local\Temp\C5DF.tmp
    Filesize

    55KB

    MD5

    7e37ab34ecdcc3e77e24522ddfd4852d

    SHA1

    38e2855e11e353cedf9a8a4f2f2747f1c5c07fcf

    SHA256

    02ef73bd2458627ed7b397ec26ee2de2e92c71a0e7588f78734761d8edbdcd9f

    SHA512

    1b037a2aa8bf951d2ffe2f724aa0b2fbb39c2173215806ba0327bda7b096301d887f9bb7db46f9e04584b16aa6b1aaeaf67f0ecf5f20eb02ceac27c8753ca587

  • \Users\Admin\AppData\Local\Temp\C5DF.tmp
    Filesize

    55KB

    MD5

    7e37ab34ecdcc3e77e24522ddfd4852d

    SHA1

    38e2855e11e353cedf9a8a4f2f2747f1c5c07fcf

    SHA256

    02ef73bd2458627ed7b397ec26ee2de2e92c71a0e7588f78734761d8edbdcd9f

    SHA512

    1b037a2aa8bf951d2ffe2f724aa0b2fbb39c2173215806ba0327bda7b096301d887f9bb7db46f9e04584b16aa6b1aaeaf67f0ecf5f20eb02ceac27c8753ca587

  • \Users\Admin\AppData\Local\Temp\C5DF.tmp
    Filesize

    55KB

    MD5

    7e37ab34ecdcc3e77e24522ddfd4852d

    SHA1

    38e2855e11e353cedf9a8a4f2f2747f1c5c07fcf

    SHA256

    02ef73bd2458627ed7b397ec26ee2de2e92c71a0e7588f78734761d8edbdcd9f

    SHA512

    1b037a2aa8bf951d2ffe2f724aa0b2fbb39c2173215806ba0327bda7b096301d887f9bb7db46f9e04584b16aa6b1aaeaf67f0ecf5f20eb02ceac27c8753ca587

  • memory/600-71-0x0000000000000000-mapping.dmp
  • memory/1200-55-0x0000000000000000-mapping.dmp
  • memory/1200-58-0x00000000001C0000-0x000000000021E000-memory.dmp
    Filesize

    376KB

  • memory/1200-64-0x00000000001C0000-0x000000000021E000-memory.dmp
    Filesize

    376KB

  • memory/1232-68-0x0000000000000000-mapping.dmp
  • memory/1660-54-0x0000000075C51000-0x0000000075C53000-memory.dmp
    Filesize

    8KB

  • memory/1724-65-0x0000000000000000-mapping.dmp