General

  • Target

    server.txt

  • Size

    1KB

  • Sample

    241010-csx56szhqm

  • MD5

    3e7329b73d8c604a7229eecc4be81db0

  • SHA1

    ce15160a01f4837e5ab0adeb5e628498cbfcfb07

  • SHA256

    bc5985c2f2536b2724e3de7b40c2b6d59cf257d07085dae821a8259daabfd81c

  • SHA512

    ea15c536dadd59cbe2d24fa5b17b72168b473bc09596ed974d2243d1b526e0e384afedcf50ab5c499c0597b9c6d9873abe43a98541fd541a613c2fb2da6987cb

Malware Config

Targets

    • Target

      server.txt

    • Size

      1KB

    • MD5

      3e7329b73d8c604a7229eecc4be81db0

    • SHA1

      ce15160a01f4837e5ab0adeb5e628498cbfcfb07

    • SHA256

      bc5985c2f2536b2724e3de7b40c2b6d59cf257d07085dae821a8259daabfd81c

    • SHA512

      ea15c536dadd59cbe2d24fa5b17b72168b473bc09596ed974d2243d1b526e0e384afedcf50ab5c499c0597b9c6d9873abe43a98541fd541a613c2fb2da6987cb

    • Remcos

      Remcos is a closed-source remote control and surveillance software.

    • Suspicious use of NtCreateProcessExOtherParentProcess

    • Boot or Logon Autostart Execution: Active Setup

      Adversaries may achieve persistence by adding a Registry key to the Active Setup of the local machine.

    • Downloads MZ/PE file

    • Drops file in Drivers directory

    • Event Triggered Execution: Image File Execution Options Injection

    • Sets service image path in registry

    • Uses Session Manager for persistence

      Creates Session Manager registry key to run executable early in system boot.

    • Checks computer location settings

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

    • Event Triggered Execution: Component Object Model Hijacking

      Adversaries may establish persistence by executing malicious content triggered by hijacked references to Component Object Model (COM) objects.

    • Executes dropped EXE

    • Impair Defenses: Safe Mode Boot

    • Loads dropped DLL

    • Reads user/profile data of web browsers

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

    • Windows security modification

    • Adds Run key to start application

    • Checks for any installed AV software in registry

    • Checks installed software on the system

      Looks up Uninstall key entries in the registry to enumerate software on the system.

    • Checks whether UAC is enabled

    • Enumerates connected drives

      Attempts to read the root path of hard drives other than the default C: drive.

    • Legitimate hosting services abused for malware hosting/C2

    • Writes to the Master Boot Record (MBR)

      Bootkits write to the MBR to gain persistence at a level below the operating system.

    • Checks system information in the registry

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

    • Drops file in System32 directory

    • Suspicious use of SetThreadContext

MITRE ATT&CK Enterprise v15

Tasks