Analysis

  • max time kernel
    134s
  • max time network
    156s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    21-05-2022 00:32

General

  • Target

    37d6832272f4b87fd9194539e17c5da57b8c4508d54e586b8c6bcf8b856f82be.exe

  • Size

    28KB

  • MD5

    07c27d514bfbde4482b8e1b6ea27b456

  • SHA1

    535e1b3f81abcfcbae2066f28f3bcbded60e6829

  • SHA256

    37d6832272f4b87fd9194539e17c5da57b8c4508d54e586b8c6bcf8b856f82be

  • SHA512

    f69492a2c8a6eca0abfb57f4b7e0d9bd347f8c8b6e952ce1998b13bf0df898e47ad87dfb3d28f6a47ff8e7652fd4ed3305fce5103b4c3e9ec29fd8af599555d2

Score
10/10

Malware Config

Extracted

Family

limerat

Attributes
  • aes_key

    yourmomisobesaporcodio

  • antivm

    true

  • c2_url

    https://pastebin.com/raw/Si5Hcuvu

  • delay

    3

  • download_payload

    false

  • install

    true

  • install_name

    RuntimeBroker.exe

  • main_folder

    UserProfile

  • pin_spread

    false

  • sub_folder

    \VM\

  • usb_spread

    true

Signatures

  • LimeRAT

    Simple yet powerful RAT for Windows machines written in .NET.

  • Executes dropped EXE 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Legitimate hosting services abused for malware hosting/C2 1 TTPs
  • Maps connected drives based on registry 3 TTPs 4 IoCs

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

  • 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 use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 6 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\37d6832272f4b87fd9194539e17c5da57b8c4508d54e586b8c6bcf8b856f82be.exe
    "C:\Users\Admin\AppData\Local\Temp\37d6832272f4b87fd9194539e17c5da57b8c4508d54e586b8c6bcf8b856f82be.exe"
    1⤵
    • Checks computer location settings
    • Maps connected drives based on registry
    • Suspicious use of WriteProcessMemory
    PID:4912
    • C:\Windows\SysWOW64\schtasks.exe
      schtasks /create /f /sc ONLOGON /RL HIGHEST /tn LimeRAT-Admin /tr "'C:\Users\Admin\VM\RuntimeBroker.exe'"
      2⤵
      • Creates scheduled task(s)
      PID:1200
    • C:\Users\Admin\VM\RuntimeBroker.exe
      "C:\Users\Admin\VM\RuntimeBroker.exe"
      2⤵
      • Executes dropped EXE
      • Maps connected drives based on registry
      • Suspicious use of AdjustPrivilegeToken
      PID:4328

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads

  • C:\Users\Admin\VM\RuntimeBroker.exe

    Filesize

    28KB

    MD5

    07c27d514bfbde4482b8e1b6ea27b456

    SHA1

    535e1b3f81abcfcbae2066f28f3bcbded60e6829

    SHA256

    37d6832272f4b87fd9194539e17c5da57b8c4508d54e586b8c6bcf8b856f82be

    SHA512

    f69492a2c8a6eca0abfb57f4b7e0d9bd347f8c8b6e952ce1998b13bf0df898e47ad87dfb3d28f6a47ff8e7652fd4ed3305fce5103b4c3e9ec29fd8af599555d2

  • C:\Users\Admin\VM\RuntimeBroker.exe

    Filesize

    28KB

    MD5

    07c27d514bfbde4482b8e1b6ea27b456

    SHA1

    535e1b3f81abcfcbae2066f28f3bcbded60e6829

    SHA256

    37d6832272f4b87fd9194539e17c5da57b8c4508d54e586b8c6bcf8b856f82be

    SHA512

    f69492a2c8a6eca0abfb57f4b7e0d9bd347f8c8b6e952ce1998b13bf0df898e47ad87dfb3d28f6a47ff8e7652fd4ed3305fce5103b4c3e9ec29fd8af599555d2

  • memory/1200-134-0x0000000000000000-mapping.dmp

  • memory/4328-135-0x0000000000000000-mapping.dmp

  • memory/4912-130-0x0000000000890000-0x000000000089C000-memory.dmp

    Filesize

    48KB

  • memory/4912-131-0x00000000050C0000-0x000000000515C000-memory.dmp

    Filesize

    624KB

  • memory/4912-132-0x0000000005160000-0x00000000051C6000-memory.dmp

    Filesize

    408KB

  • memory/4912-133-0x0000000005EA0000-0x0000000006444000-memory.dmp

    Filesize

    5.6MB