General

  • Target

    .

  • Size

    147KB

  • Sample

    240511-nqy58shc43

  • MD5

    ae0db3d719d014bd9dbf81ce77f70b2c

  • SHA1

    927ad551afa19779af44df918ad337d57b6d2fc4

  • SHA256

    53ef8a7d837458fdf5b44ec941b7042b647665ca840f030e88781feb1a54c7b9

  • SHA512

    bbab18467482e47781e1dc911abdffee0c851d31d7f899c4de654d2a45fe5163e2094dd4fe4ba0ea08676d5ec09aee079507693158577a6f5a92c821923d8577

  • SSDEEP

    1536:okk+HxYHgVDxB38R4D6llsKwhU30vD932Gs4D2HhqiS:jkVHgBM7llbpigHhqiS

Malware Config

Extracted

Credentials

  • Protocol:
    ftp
  • Host:
    109.248.203.81
  • Port:
    21
  • Username:
    alex
  • Password:
    easypassword

Extracted

Family

crimsonrat

C2

185.136.161.124

Targets

    • Target

      .

    • Size

      147KB

    • MD5

      ae0db3d719d014bd9dbf81ce77f70b2c

    • SHA1

      927ad551afa19779af44df918ad337d57b6d2fc4

    • SHA256

      53ef8a7d837458fdf5b44ec941b7042b647665ca840f030e88781feb1a54c7b9

    • SHA512

      bbab18467482e47781e1dc911abdffee0c851d31d7f899c4de654d2a45fe5163e2094dd4fe4ba0ea08676d5ec09aee079507693158577a6f5a92c821923d8577

    • SSDEEP

      1536:okk+HxYHgVDxB38R4D6llsKwhU30vD932Gs4D2HhqiS:jkVHgBM7llbpigHhqiS

    • Azorult

      An information stealer that was first discovered in 2016, targeting browsing history and passwords.

    • CrimsonRAT main payload

    • CrimsonRat

      Crimson RAT is a malware linked to a Pakistani-linked threat actor.

    • Modifies Windows Defender Real-time Protection settings

    • Modifies visiblity of hidden/system files in Explorer

    • RMS

      Remote Manipulator System (RMS) is a remote access tool developed by Russian organization TektonIT.

    • Suspicious use of NtCreateProcessExOtherParentProcess

    • UAC bypass

    • Windows security bypass

    • Grants admin privileges

      Uses net.exe to modify the user's privileges.

    • Blocks application from running via registry modification

      Adds application to list of disallowed applications.

    • Creates new service(s)

    • Downloads MZ/PE file

    • Drops file in Drivers directory

    • Modifies Installed Components in the registry

    • Modifies RDP port number used by Windows

    • Modifies Windows Firewall

    • Office macro that triggers on suspicious action

      Office document macro which triggers in special circumstances - often malicious.

    • Sets DLL path for service in the registry

    • Sets file execution options in registry

    • Sets file to hidden

      Modifies file attributes to stop it showing in Explorer etc.

    • Sets service image path in registry

    • Stops running service(s)

    • Uses Session Manager for persistence

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

    • ACProtect 1.3x - 1.4x DLL software

      Detects file using ACProtect software.

    • Checks BIOS information in registry

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

    • Checks computer location settings

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

    • Executes dropped EXE

    • Loads dropped DLL

    • Modifies file permissions

    • Reads user/profile data of web browsers

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

    • Registers COM server for autorun

    • UPX packed file

      Detects executables packed with UPX/modified UPX open source packer.

    • 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

    • Looks up external IP address via web service

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

    • Modifies WinLogon

    • Writes to the Master Boot Record (MBR)

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

    • AutoIT Executable

      AutoIT scripts compiled to PE executables.

    • Checks system information in the registry

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

    • Drops file in System32 directory

MITRE ATT&CK Matrix ATT&CK v13

Execution

System Services

2
T1569

Service Execution

2
T1569.002

Command and Scripting Interpreter

2
T1059

PowerShell

1
T1059.001

Scheduled Task/Job

1
T1053

Persistence

Create or Modify System Process

4
T1543

Windows Service

4
T1543.003

Account Manipulation

1
T1098

Boot or Logon Autostart Execution

8
T1547

Registry Run Keys / Startup Folder

7
T1547.001

Winlogon Helper DLL

1
T1547.004

Pre-OS Boot

1
T1542

Bootkit

1
T1542.003

Scheduled Task/Job

1
T1053

Privilege Escalation

Create or Modify System Process

4
T1543

Windows Service

4
T1543.003

Abuse Elevation Control Mechanism

1
T1548

Bypass User Account Control

1
T1548.002

Boot or Logon Autostart Execution

8
T1547

Registry Run Keys / Startup Folder

7
T1547.001

Winlogon Helper DLL

1
T1547.004

Scheduled Task/Job

1
T1053

Defense Evasion

Modify Registry

14
T1112

Impair Defenses

6
T1562

Disable or Modify Tools

4
T1562.001

Disable or Modify System Firewall

1
T1562.004

Hide Artifacts

3
T1564

Hidden Files and Directories

3
T1564.001

Abuse Elevation Control Mechanism

1
T1548

Bypass User Account Control

1
T1548.002

File and Directory Permissions Modification

1
T1222

Pre-OS Boot

1
T1542

Bootkit

1
T1542.003

Subvert Trust Controls

1
T1553

Install Root Certificate

1
T1553.004

Credential Access

Unsecured Credentials

1
T1552

Credentials In Files

1
T1552.001

Discovery

Query Registry

9
T1012

System Information Discovery

10
T1082

Software Discovery

1
T1518

Security Software Discovery

1
T1518.001

Peripheral Device Discovery

2
T1120

Lateral Movement

Remote Services

1
T1021

Remote Desktop Protocol

1
T1021.001

Collection

Data from Local System

1
T1005

Command and Control

Web Service

1
T1102

Impact

Service Stop

1
T1489

Tasks