Overview

overview

10

Static

static

IRS NOTICE LETTER.exe

windows7_x64

10

IRS NOTICE LETTER.exe

windows10_x64

10

Analysis

  • max time kernel
    77s
  • max time network
    77s
  • platform
    windows7_x64
  • resource
    win7v20201028
  • submitted
    05-12-2020 03:05

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General

  • Target

    IRS NOTICE LETTER.exe

Score
10/10
matiexkeyloggerspywarestealer

Malware Config

Extracted

Family

matiex

Credentials

  • Protocol:     smtp
  • Host:
    ckfashion.shop
  • Port:
    26
  • Username:
    matiex@ckfashion.shop
  • Password:
    123Mat+++

Signatures

  • Matiex

    Matiex is a keylogger and infostealer first seen in July 2020.

    stealerkeyloggermatiex
  • Matiex Main Payload 4 IoCs
  • Reads data files stored by FTP clients 2 TTPs

    Tries to access configuration files associated with programs like FileZilla.

    spywarestealer
  • Reads user/profile data of local email clients 2 TTPs

    Email clients store some user data on disk where infostealers will often target it.

    spywarestealer
  • Reads user/profile data of web browsers 2 TTPs

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

    spywarestealer
  • Looks up external IP address via web service 3 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • 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.

    persistence
  • Suspicious behavior: EnumeratesProcesses 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 17 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\IRS NOTICE LETTER.exe
    "C:\Users\Admin\AppData\Local\Temp\IRS NOTICE LETTER.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:1944
    • C:\Windows\SysWOW64\schtasks.exe
      "C:\Windows\System32\schtasks.exe" /Create /TN "Updates\DhRDIyd" /XML "C:\Users\Admin\AppData\Local\Temp\tmpDF38.tmp"
      2⤵
      • Creates scheduled task(s)
      PID:1720
    • C:\Users\Admin\AppData\Local\Temp\IRS NOTICE LETTER.exe
      "C:\Users\Admin\AppData\Local\Temp\IRS NOTICE LETTER.exe"
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:1804
      • C:\Windows\SysWOW64\netsh.exe
        "netsh" wlan show profile
        3⤵
          PID:808

    Network

    MITRE ATT&CK Matrix ATT&CK v6

    Initial Access

    Execution

    Scheduled Task

    1
    T1053

    Persistence

    Scheduled Task

    1
    T1053

    Privilege Escalation

    Scheduled Task

    1
    T1053

    Defense Evasion

    Credential Access

    Credentials in Files

    3
    T1081

    Discovery

    System Information Discovery

    1
    T1082

    Lateral Movement

    Collection

    Data from Local System

    3
    T1005

    Exfiltration

    Command and Control

    Impact

    Replay Monitor

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    Downloads

    • C:\Users\Admin\AppData\Local\Temp\tmpDF38.tmp
      MD5

      0a414c46a8834002a8d445c19ecfdaf9

      SHA1

      1baebec51cf688c36330a6652fb0a12467a8d041

      SHA256

      9fa4c8bd83e810c37f3190d64c33bb5d202cce3fda83e9c18c1df4466299bbe6

      SHA512

      b1d726ae35f75f6139cbb1e73d7027c5598cab09eda250cf112b1f97b5696b143c01aa11111cd1bf395f7958914561423deafb188ff1dea335fb51e9f11255bf

      Download Submit
    • memory/808-18-0x0000000000000000-mapping.dmp
      Download
    • memory/1720-9-0x0000000000000000-mapping.dmp
      Download
    • memory/1804-12-0x000000000047083E-mapping.dmp
      Download
    • memory/1804-11-0x0000000000400000-0x0000000000476000-memory.dmp
      Filesize

      472KB

      Download
    • memory/1804-13-0x0000000000400000-0x0000000000476000-memory.dmp
      Filesize

      472KB

      Download
    • memory/1804-14-0x0000000000400000-0x0000000000476000-memory.dmp
      Filesize

      472KB

      Download
    • memory/1804-15-0x00000000742A0000-0x000000007498E000-memory.dmp
      Filesize

      6.9MB

      Download
    • memory/1944-7-0x0000000000670000-0x0000000000676000-memory.dmp
      Filesize

      24KB

      Download
    • memory/1944-8-0x0000000005200000-0x0000000005272000-memory.dmp
      Filesize

      456KB

      Download
    • memory/1944-6-0x0000000005020000-0x0000000005097000-memory.dmp
      Filesize

      476KB

      Download
    • memory/1944-5-0x00000000004B0000-0x00000000004C4000-memory.dmp
      Filesize

      80KB

      Download
    • memory/1944-2-0x0000000074320000-0x0000000074A0E000-memory.dmp
      Filesize

      6.9MB

      Download
    • memory/1944-3-0x0000000001250000-0x0000000001251000-memory.dmp
      Filesize

      4KB

      Download