General

  • Target

    vir.exe

  • Size

    286.1MB

  • Sample

    240524-ntfhasfe96

  • MD5

    6bc843fcda3370c21284715cc6949d72

  • SHA1

    4e95631af3d2a87831599233390f62549fdcc8ad

  • SHA256

    18cdbfed464f46936c57294978d0efe89e4fc7439435645bc2efcb130b5bb1e7

  • SHA512

    591964023d2e44519722666889434720870d363671aaaa13df1d005c76df82df0107f02a6f4197cbcbc1b4c88a18a755118d17617dc7e9c41d291ef79d59018c

  • SSDEEP

    6291456:HdHVeV6odBeWFv1k4R4b0ewZkhT4ofHwJjvZDQPf2tLSkHt:9AQWeSWgfecGT4RjvqP85N

Malware Config

Extracted

Family

quasar

Attributes
  • reconnect_delay

    3000

Extracted

Family

quasar

Version

1.4.1

Botnet

romka

C2

jozzu420-51305.portmap.host:51305

Mutex

0445c342-b551-411c-9b80-cd437437f491

Attributes
  • encryption_key

    E1BF1D99459F04CAF668F054744BC2C514B0A3D6

  • install_name

    Romilyaa.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Windows 10 Boot

  • subdirectory

    SubDir

Targets

    • Target

      vir.exe

    • Size

      286.1MB

    • MD5

      6bc843fcda3370c21284715cc6949d72

    • SHA1

      4e95631af3d2a87831599233390f62549fdcc8ad

    • SHA256

      18cdbfed464f46936c57294978d0efe89e4fc7439435645bc2efcb130b5bb1e7

    • SHA512

      591964023d2e44519722666889434720870d363671aaaa13df1d005c76df82df0107f02a6f4197cbcbc1b4c88a18a755118d17617dc7e9c41d291ef79d59018c

    • SSDEEP

      6291456:HdHVeV6odBeWFv1k4R4b0ewZkhT4ofHwJjvZDQPf2tLSkHt:9AQWeSWgfecGT4RjvqP85N

    • Modifies WinLogon for persistence

    • Modifies firewall policy service

    • Modifies visibility of file extensions in Explorer

    • Modifies visiblity of hidden/system files in Explorer

    • PrivateLoader

      PrivateLoader is a downloader sold as a pay-per-install malware distribution service.

    • Quasar RAT

      Quasar is an open source Remote Access Tool.

    • Quasar payload

    • UAC bypass

    • Windows security bypass

    • Identifies VirtualBox via ACPI registry values (likely anti-VM)

    • Modifies boot configuration data using bcdedit

    • Blocklisted process makes network request

    • Command and Scripting Interpreter: PowerShell

      Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

    • Disables RegEdit via registry modification

    • Downloads MZ/PE file

    • Drops file in Drivers directory

    • Modifies Installed Components in the registry

    • Sets service image path in registry

    • .NET Reactor proctector

      Detects an executable protected by an unregistered version of Eziriz's .NET Reactor.

    • 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.

    • Drops startup file

    • Executes dropped EXE

    • Loads dropped DLL

    • Modifies file permissions

    • Modifies system executable filetype association

    • Reads user/profile data of web browsers

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

    • Registers COM server for autorun

    • Themida packer

      Detects Themida, an advanced Windows software protection system.

    • UPX packed file

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

    • Unexpected DNS network traffic destination

      Network traffic to other servers than the configured DNS servers was detected on the DNS port.

    • 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.

    • Drops file in System32 directory

    • Suspicious use of NtSetInformationThreadHideFromDebugger

    • Suspicious use of SetThreadContext

MITRE ATT&CK Matrix ATT&CK v13

Execution

Command and Scripting Interpreter

1
T1059

PowerShell

1
T1059.001

Scheduled Task/Job

1
T1053

Persistence

Boot or Logon Autostart Execution

6
T1547

Registry Run Keys / Startup Folder

4
T1547.001

Winlogon Helper DLL

2
T1547.004

Create or Modify System Process

1
T1543

Windows Service

1
T1543.003

Event Triggered Execution

1
T1546

Change Default File Association

1
T1546.001

Pre-OS Boot

1
T1542

Bootkit

1
T1542.003

Scheduled Task/Job

1
T1053

Privilege Escalation

Boot or Logon Autostart Execution

6
T1547

Registry Run Keys / Startup Folder

4
T1547.001

Winlogon Helper DLL

2
T1547.004

Create or Modify System Process

1
T1543

Windows Service

1
T1543.003

Abuse Elevation Control Mechanism

1
T1548

Bypass User Account Control

1
T1548.002

Event Triggered Execution

1
T1546

Change Default File Association

1
T1546.001

Scheduled Task/Job

1
T1053

Defense Evasion

Modify Registry

15
T1112

Hide Artifacts

2
T1564

Hidden Files and Directories

2
T1564.001

Abuse Elevation Control Mechanism

1
T1548

Bypass User Account Control

1
T1548.002

Impair Defenses

3
T1562

Disable or Modify Tools

3
T1562.001

Virtualization/Sandbox Evasion

1
T1497

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

Virtualization/Sandbox Evasion

1
T1497

System Information Discovery

8
T1082

Software Discovery

1
T1518

Security Software Discovery

1
T1518.001

Peripheral Device Discovery

2
T1120

Collection

Data from Local System

1
T1005

Command and Control

Web Service

1
T1102

Impact

Inhibit System Recovery

1
T1490

Tasks