> ## Documentation Index
> Fetch the complete documentation index at: https://docs.specterops.io/llms.txt
> Use this file to discover all available pages before exploring further.

# asrep2kirbi

> Convert AS-REP response to .kirbi ticket format

## Overview

Convert AS-REP (Authentication Server Reply) responses to .kirbi ticket format. This utility command processes AS-REP data extracted from network captures or other sources into usable Kerberos ticket files.

## Syntax

```bash theme={null}
Rubeus.exe asrep2kirbi /asrep:ASREP_DATA [options]
```

## Required Parameters

<ParamField path="asrep" type="string" required>
  Base64-encoded AS-REP response data
</ParamField>

## Optional Parameters

<ParamField path="outfile" type="string">
  Save converted ticket to file
</ParamField>

<ParamField path="ptt" type="boolean">
  Pass-the-ticket (inject converted ticket)
</ParamField>

## Examples

<CodeGroup>
  ```bash Basic Conversion theme={null}
  # Convert AS-REP to kirbi format
  Rubeus.exe asrep2kirbi /asrep:base64_asrep_data

  # Convert and save to file
  Rubeus.exe asrep2kirbi /asrep:asrep_data /outfile:converted.kirbi

  # Convert and inject immediately
  Rubeus.exe asrep2kirbi /asrep:asrep_data /ptt
  ```
</CodeGroup>

## AS-REP Data Sources

<Accordion title="Data Acquisition">
  **Network Captures:**

  * Wireshark/tcpdump packet captures
  * AS-REP responses from KDC communications
  * Extracted from authentication exchanges
  * Base64-encoded packet data

  **Memory Dumps:**

  * Process memory containing AS-REP responses
  * Cached authentication data
  * LSA memory structures
  * Application memory buffers

  **Log Analysis:**

  * Authentication logs with embedded data
  * Debug logs from Kerberos implementations
  * Application logs with authentication details
  * Security event log analysis
</Accordion>

## Use Cases

<Accordion title="Ticket Recovery">
  **Data Conversion:**

  * Convert captured AS-REP data to usable tickets
  * Process authentication data from various sources
  * Create .kirbi files from raw Kerberos data
  * Enable ticket analysis and manipulation

  **Forensic Analysis:**

  * Analyze captured authentication exchanges
  * Reconstruct ticket data from fragments
  * Process historical authentication data
  * Support incident response activities
</Accordion>

## Integration Workflows

<Accordion title="Capture and Conversion">
  **Complete Workflow:**

  ```bash theme={null}
  # 1. Capture AS-REP from network traffic
  # Use Wireshark, tcpdump, or other packet capture tools

  # 2. Extract AS-REP data as base64
  # Process packet capture to extract AS-REP portion

  # 3. Convert to .kirbi format
  Rubeus.exe asrep2kirbi /asrep:captured_asrep_data /outfile:recovered.kirbi

  # 4. Use recovered ticket
  Rubeus.exe ptt /ticket:recovered.kirbi
  ```
</Accordion>

<Accordion title="Memory Analysis">
  **Memory-Based Recovery:**

  ```bash theme={null}
  # 1. Extract AS-REP data from memory dumps
  # Use memory analysis tools to locate AS-REP structures

  # 2. Convert extracted data
  Rubeus.exe asrep2kirbi /asrep:memory_extracted_data

  # 3. Analyze converted ticket
  Rubeus.exe describe /ticket:converted.kirbi
  ```
</Accordion>

## Technical Considerations

<Accordion title="AS-REP Structure">
  **Response Components:**

  * KDC certificate information
  * Encrypted TGT data
  * Session key information
  * Client and server principal names
  * Ticket validity periods

  **Conversion Process:**

  * Parse AS-REP ASN.1 structure
  * Extract TGT components
  * Reconstruct .kirbi format
  * Maintain ticket integrity
</Accordion>

## Data Validation

<Accordion title="Quality Assurance">
  **Verification Steps:**

  * Validate AS-REP structure integrity
  * Check encryption and encoding
  * Verify ticket component completeness
  * Test converted ticket functionality

  **Error Handling:**

  * Malformed AS-REP data
  * Incomplete packet captures
  * Encoding issues
  * Structural corruption
</Accordion>

## Related Commands

* [`asreproast`](/commands/roasting/asreproast) - Generate AS-REP data for conversion
* [`describe`](/commands/management/describe) - Analyze converted tickets
* [`ptt`](/commands/management/ptt) - Use converted tickets
* [`kirbi`](/commands/miscellaneous/kirbi) - Alternative ticket format operations