Analysis

  • max time kernel
    91s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    14-07-2022 03:18

General

  • Target

    PO#CWA006635.exe

  • Size

    414KB

  • MD5

    8cf823ee0766126638d33918383ca5d8

  • SHA1

    3b215b084b9ff049a860fc29108f62c4b6d2133b

  • SHA256

    6de7efc9e04cb4db0acc603a7ed700b186d0545acd0e8e84a1d8cce668202dc8

  • SHA512

    41cd0278ebb15faddd178fb826e8dc74021980f09b94ff785b1b6d88d5504c2e7b37450484666fd7a00e3c3e865459ace696c41ad84e4d0630d1ef893e93ed94

Malware Config

Extracted

Credentials

  • Protocol:
    smtp
  • Host:
    mail.cpworldindia.com
  • Port:
    587
  • Username:
    import.cs@ahd.cpworldindia.com
  • Password:
    imprtcs@2019

Extracted

Family

agenttesla

Credentials

  • Protocol:
    smtp
  • Host:
    mail.cpworldindia.com
  • Port:
    587
  • Username:
    import.cs@ahd.cpworldindia.com
  • Password:
    imprtcs@2019

Signatures

  • AgentTesla

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

  • suricata: ET MALWARE AgentTesla Exfil Via SMTP

    suricata: ET MALWARE AgentTesla Exfil Via SMTP

  • AgentTesla payload 1 IoCs
  • Disables Task Manager via registry modification
  • Drops file in Drivers directory 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • 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
  • 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.

  • Modifies registry key 1 TTPs 1 IoCs
  • 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\PO#CWA006635.exe
    "C:\Users\Admin\AppData\Local\Temp\PO#CWA006635.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of SetThreadContext
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4588
    • C:\Windows\SysWOW64\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\FzcrWS" /XML "C:\Users\Admin\AppData\Local\Temp\tmpE208.tmp"
      2⤵
      • Creates scheduled task(s)
      PID:2932
    • C:\Users\Admin\AppData\Local\Temp\PO#CWA006635.exe
      "{path}"
      2⤵
      • Drops file in Drivers directory
      • Accesses Microsoft Outlook profiles
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      • outlook_office_path
      • outlook_win_path
      PID:4400
      • C:\Windows\SysWOW64\REG.exe
        REG add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 1 /f
        3⤵
        • Modifies registry key
        PID:5000
      • C:\Windows\SysWOW64\netsh.exe
        "netsh" wlan show profile
        3⤵
          PID:2592

    Network

    MITRE ATT&CK Matrix ATT&CK v6

    Execution

    Scheduled Task

    1
    T1053

    Persistence

    Scheduled Task

    1
    T1053

    Privilege Escalation

    Scheduled Task

    1
    T1053

    Defense Evasion

    Modify Registry

    1
    T1112

    Credential Access

    Credentials in Files

    3
    T1081

    Discovery

    Query Registry

    1
    T1012

    System Information Discovery

    2
    T1082

    Collection

    Data from Local System

    3
    T1005

    Email Collection

    1
    T1114

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Local\Temp\tmpE208.tmp
      Filesize

      1KB

      MD5

      223ed65c305252ef2c049332fa5b998b

      SHA1

      26bd8e81cbd9cbbf976cdbb075ada0d304a464b9

      SHA256

      769c259c9aff127cec91e857d5c3f0d121cfc4e8a85147f3a37e79e4a4a970d5

      SHA512

      cefb35a0ff44ab3deabae9ecf58bda3ad49dfab84557d6bcc0a0da3f8812651de0671a6d9f4ddc9ad7cdbc5b8ef67d15380492db5cb85c04dd69e56c5be647cc

    • memory/2592-142-0x0000000000000000-mapping.dmp
    • memory/2932-135-0x0000000000000000-mapping.dmp
    • memory/4400-139-0x0000000006360000-0x00000000063C6000-memory.dmp
      Filesize

      408KB

    • memory/4400-137-0x0000000000000000-mapping.dmp
    • memory/4400-138-0x0000000000400000-0x0000000000452000-memory.dmp
      Filesize

      328KB

    • memory/4400-141-0x00000000066D0000-0x0000000006720000-memory.dmp
      Filesize

      320KB

    • memory/4588-134-0x0000000008EB0000-0x0000000008F4C000-memory.dmp
      Filesize

      624KB

    • memory/4588-133-0x0000000005720000-0x000000000572A000-memory.dmp
      Filesize

      40KB

    • memory/4588-132-0x0000000005780000-0x0000000005812000-memory.dmp
      Filesize

      584KB

    • memory/4588-130-0x0000000000CC0000-0x0000000000D2E000-memory.dmp
      Filesize

      440KB

    • memory/4588-131-0x0000000005D30000-0x00000000062D4000-memory.dmp
      Filesize

      5.6MB

    • memory/5000-140-0x0000000000000000-mapping.dmp