Analysis

  • max time kernel
    128s
  • max time network
    115s
  • platform
    windows10_x64
  • resource
    win10v20201028
  • submitted
    22-01-2021 11:35

General

  • Target

    ba0f71fb8d0bc64a55644f7086fe2e03d78dab544f9998658eca5ebd2c48be76.exe

  • Size

    1.1MB

  • MD5

    92edc65726762623172b37e177bd09de

  • SHA1

    8a75db87fb9a1cfc0c8dc24d42dcba490919c954

  • SHA256

    ba0f71fb8d0bc64a55644f7086fe2e03d78dab544f9998658eca5ebd2c48be76

  • SHA512

    2aa1496d3e192d14efece08c9477f3dd4e69a70af84ac9744cbd9559a57f1dbdb6e67c9ad32fb35e3d147833a5eaee0fb84e3368bd50715b4f67e8aeffa63b63

Malware Config

Extracted

Family

agenttesla

Credentials

  • Protocol:
    smtp
  • Host:
    smtp.yandex.com
  • Port:
    587
  • Username:
    vbjmys@yandex.com
  • Password:
    officepost8

Signatures

  • AgentTesla

    Agent Tesla is a remote access tool (RAT) written in visual basic.

  • AgentTesla Payload 2 IoCs
  • Executes dropped EXE 2 IoCs
  • Reads data files stored by FTP clients 2 TTPs

    Tries to access configuration files associated with programs like FileZilla.

  • 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.

  • Adds Run key to start application 2 TTPs 3 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Drops file in Program Files directory 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Suspicious behavior: EnumeratesProcesses 19 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of WriteProcessMemory 17 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\ba0f71fb8d0bc64a55644f7086fe2e03d78dab544f9998658eca5ebd2c48be76.exe
    "C:\Users\Admin\AppData\Local\Temp\ba0f71fb8d0bc64a55644f7086fe2e03d78dab544f9998658eca5ebd2c48be76.exe"
    1⤵
    • Drops file in Program Files directory
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3888
    • C:\Windows\SysWOW64\cmd.exe
      "cmd.exe" /c REG ADD "HKCU\Software\Microsoft\Windows\CurrentVersion\Run" /f /v "pls" /t REG_SZ /d "C:\Program Files (x86)\sshhhaaa.exe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:776
      • C:\Windows\SysWOW64\reg.exe
        REG ADD "HKCU\Software\Microsoft\Windows\CurrentVersion\Run" /f /v "pls" /t REG_SZ /d "C:\Program Files (x86)\sshhhaaa.exe"
        3⤵
        • Adds Run key to start application
        PID:752
    • C:\Program Files (x86)\sshhhaaa.exe
      "C:\Program Files (x86)\sshhhaaa.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of SetThreadContext
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:4084
      • C:\Users\Admin\AppData\Local\Temp\RegAsm.exe
        "C:\Users\Admin\AppData\Local\Temp\RegAsm.exe"
        3⤵
        • Executes dropped EXE
        • Adds Run key to start application
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:920

Network

MITRE ATT&CK Matrix ATT&CK v6

Persistence

Registry Run Keys / Startup Folder

1
T1060

Defense Evasion

Modify Registry

1
T1112

Credential Access

Credentials in Files

3
T1081

Discovery

System Information Discovery

1
T1082

Collection

Data from Local System

3
T1005

Replay Monitor

Loading Replay Monitor...

Downloads

  • C:\Program Files (x86)\sshhhaaa.exe
    MD5

    92edc65726762623172b37e177bd09de

    SHA1

    8a75db87fb9a1cfc0c8dc24d42dcba490919c954

    SHA256

    ba0f71fb8d0bc64a55644f7086fe2e03d78dab544f9998658eca5ebd2c48be76

    SHA512

    2aa1496d3e192d14efece08c9477f3dd4e69a70af84ac9744cbd9559a57f1dbdb6e67c9ad32fb35e3d147833a5eaee0fb84e3368bd50715b4f67e8aeffa63b63

  • C:\Program Files (x86)\sshhhaaa.exe
    MD5

    92edc65726762623172b37e177bd09de

    SHA1

    8a75db87fb9a1cfc0c8dc24d42dcba490919c954

    SHA256

    ba0f71fb8d0bc64a55644f7086fe2e03d78dab544f9998658eca5ebd2c48be76

    SHA512

    2aa1496d3e192d14efece08c9477f3dd4e69a70af84ac9744cbd9559a57f1dbdb6e67c9ad32fb35e3d147833a5eaee0fb84e3368bd50715b4f67e8aeffa63b63

  • C:\Users\Admin\AppData\Local\Temp\RegAsm.exe
    MD5

    b58b926c3574d28d5b7fdd2ca3ec30d5

    SHA1

    d260c4ffd603a9cfc057fcb83d678b1cecdf86f9

    SHA256

    6e70b56d748c4ccab13cc8a055d3795ea0dd95fe3b70568d7d3ac0c6621140a3

    SHA512

    b13cb998822b716b695013bcd6dec62a2290567d0d1743b2d982ca084235cf69c6ea1fc91c9d4e62657c6f9e102c7c60e81296ab055ffe43b887c5f8ec8958ab

  • C:\Users\Admin\AppData\Local\Temp\RegAsm.exe
    MD5

    b58b926c3574d28d5b7fdd2ca3ec30d5

    SHA1

    d260c4ffd603a9cfc057fcb83d678b1cecdf86f9

    SHA256

    6e70b56d748c4ccab13cc8a055d3795ea0dd95fe3b70568d7d3ac0c6621140a3

    SHA512

    b13cb998822b716b695013bcd6dec62a2290567d0d1743b2d982ca084235cf69c6ea1fc91c9d4e62657c6f9e102c7c60e81296ab055ffe43b887c5f8ec8958ab

  • memory/752-11-0x0000000000000000-mapping.dmp
  • memory/776-10-0x0000000000000000-mapping.dmp
  • memory/920-28-0x00000000004617EE-mapping.dmp
  • memory/920-31-0x0000000073960000-0x000000007404E000-memory.dmp
    Filesize

    6.9MB

  • memory/920-38-0x00000000053C0000-0x00000000053C1000-memory.dmp
    Filesize

    4KB

  • memory/920-37-0x0000000004F10000-0x0000000004F11000-memory.dmp
    Filesize

    4KB

  • memory/920-36-0x0000000004DF0000-0x0000000004DF1000-memory.dmp
    Filesize

    4KB

  • memory/920-34-0x0000000005450000-0x0000000005451000-memory.dmp
    Filesize

    4KB

  • memory/920-32-0x0000000000700000-0x0000000000766000-memory.dmp
    Filesize

    408KB

  • memory/3888-6-0x0000000000E80000-0x0000000000E9E000-memory.dmp
    Filesize

    120KB

  • memory/3888-7-0x0000000000E60000-0x0000000000E61000-memory.dmp
    Filesize

    4KB

  • memory/3888-8-0x00000000076C0000-0x00000000076C1000-memory.dmp
    Filesize

    4KB

  • memory/3888-12-0x0000000004F51000-0x0000000004F52000-memory.dmp
    Filesize

    4KB

  • memory/3888-9-0x0000000004F50000-0x0000000004F51000-memory.dmp
    Filesize

    4KB

  • memory/3888-2-0x0000000073A20000-0x000000007410E000-memory.dmp
    Filesize

    6.9MB

  • memory/3888-5-0x0000000004D30000-0x0000000004D31000-memory.dmp
    Filesize

    4KB

  • memory/3888-3-0x0000000000390000-0x0000000000391000-memory.dmp
    Filesize

    4KB

  • memory/4084-16-0x0000000073A20000-0x000000007410E000-memory.dmp
    Filesize

    6.9MB

  • memory/4084-26-0x0000000004F81000-0x0000000004F82000-memory.dmp
    Filesize

    4KB

  • memory/4084-23-0x0000000004F80000-0x0000000004F81000-memory.dmp
    Filesize

    4KB

  • memory/4084-13-0x0000000000000000-mapping.dmp
  • memory/4084-25-0x00000000047B0000-0x00000000047B1000-memory.dmp
    Filesize

    4KB

  • memory/4084-24-0x0000000004E60000-0x0000000004E6B000-memory.dmp
    Filesize

    44KB