Overview

overview

10

Static

static

3

srv.exe

windows10-ltsc_2021-x64

10

Sharing

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General

  • Target
    srv.exe
  • Size 7.3MB
  • Sample260622-tct71sd14r
  • SHA256 7c570c457a66c35734dd75b0d5e916bff62335d688bb9315701233fb628c2ca8
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
costuradefense_evasionexecutionpackerpersistence

Malware Config

Targets

    • Target
      srv.exe
    • Size 7.3MB
    • SHA256 7c570c457a66c35734dd75b0d5e916bff62335d688bb9315701233fb628c2ca8
    • MD5 SHA1 SHA512 SSDEEP TLSH
    Score
    10/10
    costuradefense_evasionexecutionpackerpersistence

    • Modifies WinLogon for persistence

      persistence

    • Sets service image path in registry

      This determines the executable launched when a service starts. It can be used to establish persistence.

      persistence

    • 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

    • Indicator Removal: Clear Windows Event Logs

      Clear Windows Event Logs to hide the activity of an intrusion.

      defense_evasion

    • Command and Scripting Interpreter: PowerShell

      Using powershell.exe command.

      execution

    • Drops desktop.ini file(s)

    • 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

    behavioral1

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1
T1059

PowerShell

1
T1059.001

Scheduled Task/Job

1
T1053

Scheduled Task

1
T1053.005

Persistence

Boot or Logon Autostart Execution

2
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Winlogon Helper DLL

1
T1547.004

Create or Modify System Process

1
T1543

Windows Service

1
T1543.003

Scheduled Task/Job

1
T1053

Scheduled Task

1
T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

2
T1547

Registry Run Keys / Startup Folder

1
T1547.001

Winlogon Helper DLL

1
T1547.004

Create or Modify System Process

1
T1543

Windows Service

1
T1543.003

Scheduled Task/Job

1
T1053

Scheduled Task

1
T1053.005

Defense Evasion

Indicator Removal

1
T1070

Clear Windows Event Logs

1
T1070.001

Modify Registry

2
T1112

Credential Access

Discovery

Query Registry

5
T1012

System Information Discovery

5
T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Tasks