Analysis

  • max time kernel
    134s
  • max time network
    47s
  • platform
    windows7_x64
  • resource
    win7-20220414-en
  • submitted
    21-05-2022 02:09

General

  • Target

    NYRNC200420511_FreightArrival.exe

  • Size

    446KB

  • MD5

    4e94b9a3025122a9949b79b37eeb3cff

  • SHA1

    a298bbb92765a40d6229da48b5c6c0edbc70f510

  • SHA256

    cb2792644a81d965b332d8d165e1e6f75894b43942a33d7e367f9b3a36d4a2bf

  • SHA512

    8551ea40aa3ee4dfc119b4560bee1c6a501be24b53f209e6b1672902b37a063cdd859822ba5793383ef679364fadc672b03c5752915f5404c75be74bef6678f3

Malware Config

Extracted

Family

agenttesla

Credentials

  • Protocol:
    smtp
  • Host:
    mail.karmachalets.co.in
  • Port:
    587
  • Username:
    [email protected]
  • Password:
    Akshya@123

Signatures

  • AgentTesla

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

  • CoreEntity .NET Packer 2 IoCs

    A .NET packer called CoreEntity where it has embedded the payload as a BitMap object which is later decrypted.

  • AgentTesla Payload 6 IoCs
  • Looks for VirtualBox Guest Additions in registry 2 TTPs
  • ReZer0 packer 1 IoCs

    Detects ReZer0, a packer with multiple versions used in various campaigns.

  • Looks for VMWare Tools registry key 2 TTPs
  • Checks BIOS information in registry 2 TTPs 2 IoCs

    BIOS information is often read in order to detect sandboxing environments.

  • 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.

  • Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs
  • Maps connected drives based on registry 3 TTPs 2 IoCs

    Disk information is often read in order to detect sandboxing environments.

  • Suspicious use of SetThreadContext 1 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 3 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 17 IoCs
  • outlook_office_path 1 IoCs
  • outlook_win_path 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\NYRNC200420511_FreightArrival.exe
    "C:\Users\Admin\AppData\Local\Temp\NYRNC200420511_FreightArrival.exe"
    1⤵
    • Checks BIOS information in registry
    • Maps connected drives based on registry
    • Suspicious use of SetThreadContext
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1656
    • C:\Windows\SysWOW64\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\PldCGfbSGLnQ" /XML "C:\Users\Admin\AppData\Local\Temp\tmp8122.tmp"
      2⤵
      • Creates scheduled task(s)
      PID:940
    • C:\Users\Admin\AppData\Local\Temp\NYRNC200420511_FreightArrival.exe
      "{path}"
      2⤵
      • Accesses Microsoft Outlook profiles
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      • outlook_office_path
      • outlook_win_path
      PID:1244
      • C:\Windows\SysWOW64\netsh.exe
        "netsh" wlan show profile
        3⤵
          PID:748

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Local\Temp\tmp8122.tmp

      Filesize

      1KB

      MD5

      887823c77259143e4f9574e1e4328368

      SHA1

      1e46c4039cefaacf9e8802aec63d56140d1f7e9c

      SHA256

      853f0fc3bd2a5a7b48e2360b53a70f9df553fa02c1f5965f401a350945db95a8

      SHA512

      bcad89ec70b56644a417ca65f30db694ec7834aaca026535984a27fcc0cf505dbc5d716f298e806d4330f8cabb837ed8f59013dbd164835569ad2b0bb8571ccd

    • memory/748-72-0x0000000000000000-mapping.dmp

    • memory/940-58-0x0000000000000000-mapping.dmp

    • memory/1244-63-0x0000000000400000-0x0000000000452000-memory.dmp

      Filesize

      328KB

    • memory/1244-60-0x0000000000400000-0x0000000000452000-memory.dmp

      Filesize

      328KB

    • memory/1244-61-0x0000000000400000-0x0000000000452000-memory.dmp

      Filesize

      328KB

    • memory/1244-64-0x0000000000400000-0x0000000000452000-memory.dmp

      Filesize

      328KB

    • memory/1244-65-0x0000000000400000-0x0000000000452000-memory.dmp

      Filesize

      328KB

    • memory/1244-66-0x000000000044C8DE-mapping.dmp

    • memory/1244-70-0x0000000000400000-0x0000000000452000-memory.dmp

      Filesize

      328KB

    • memory/1244-68-0x0000000000400000-0x0000000000452000-memory.dmp

      Filesize

      328KB

    • memory/1656-57-0x0000000004780000-0x00000000047D8000-memory.dmp

      Filesize

      352KB

    • memory/1656-56-0x0000000000C80000-0x0000000000C88000-memory.dmp

      Filesize

      32KB

    • memory/1656-54-0x0000000001300000-0x0000000001376000-memory.dmp

      Filesize

      472KB

    • memory/1656-55-0x00000000765C1000-0x00000000765C3000-memory.dmp

      Filesize

      8KB