Overview

overview

10

Static

static

10

RealtekHDAudio.exe

windows10-2004-x64

10

RealtekHDAudio.exe

windows11-ltsc_2024-x64

10

Sharing

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General

  • Target
    RealtekHDAudio.exe
  • Size 402KB
  • Sample260709-qab2wab15v
  • SHA256 36e919a8ce2d4a449369cfcb66ae8da0b5054c9fcc70201e954168105aef9941
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
sheetratadwaredefense_evasionevasionexecutionpersistenceprivilege_escalationspywaretrojan

Malware Config

Targets

    • Target
      RealtekHDAudio.exe
    • Size 402KB
    • SHA256 36e919a8ce2d4a449369cfcb66ae8da0b5054c9fcc70201e954168105aef9941
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    10/10
    defense_evasionevasionexecutionsheetratpersistenceprivilege_escalationtrojanadwarespyware

    • Detects Sheetrat Payload

      Sheetrat aka NonEuclid RAT is a trojan written in C#.

    • Family: Sheetrat, NonEuclid rat

      Sheetrat aka NonEuclid RAT is a trojan written in C#.

      trojansheetrat

    • Modifies WinLogon for persistence

      persistence

    • Modifies Windows Defender DisableAntiSpyware settings

      evasiontrojan

    • Modifies Windows Defender TamperProtection settings

      evasiontrojan

    • Modifies firewall policy service

      defense_evasion

    • Modifies security service

      defense_evasion

    • UAC bypass

      defense_evasiontrojan

    • Boot or Logon Autostart Execution: Active Setup

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

      persistence

    • Modifies Windows Firewall

      defense_evasion

    • Checks computer location settings

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

    • Creates new service(s)

      persistenceexecution

    • Executes dropped EXE

    • Loads dropped DLL

    • Stops running service(s)

      defense_evasionexecution

    • Windows security modification

      defense_evasiontrojan

    • Checks whether UAC is enabled

      defense_evasiontrojan

    • Enumerates connected drives

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

    • Looks up external IP address via web service

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

    • Drops file in System32 directory

    behavioral1behavioral2

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1
T1053

Scheduled Task

1
T1053.005

System Services

2
T1569

Service Execution

2
T1569.002

Persistence

Boot or Logon Autostart Execution

2
T1547

Active Setup

1
T1547.014

Winlogon Helper DLL

1
T1547.004

Create or Modify System Process

7
T1543

Windows Service

7
T1543.003

Event Triggered Execution

1
T1546

Netsh Helper DLL

1
T1546.007

Scheduled Task/Job

1
T1053

Scheduled Task

1
T1053.005

Privilege Escalation

Abuse Elevation Control Mechanism

1
T1548

Bypass User Account Control

1
T1548.002

Boot or Logon Autostart Execution

2
T1547

Active Setup

1
T1547.014

Winlogon Helper DLL

1
T1547.004

Create or Modify System Process

7
T1543

Windows Service

7
T1543.003

Event Triggered Execution

1
T1546

Netsh Helper DLL

1
T1546.007

Scheduled Task/Job

1
T1053

Scheduled Task

1
T1053.005

Defense Evasion

Abuse Elevation Control Mechanism

1
T1548

Bypass User Account Control

1
T1548.002

Impair Defenses

7
T1562

Disable or Modify System Firewall

2
T1562.004

Disable or Modify Tools

4
T1562.001

Modify Registry

10
T1112

Credential Access

Discovery

Peripheral Device Discovery

2
T1120

Query Registry

5
T1012

System Information Discovery

6
T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Service Stop

1
T1489

Tasks