Question Analysis
On a Linux system, you suspect someone erased their command history by linking the history file to /dev/null. Investigate process events and determine which utility was executed to achieve this.
23d348f3-cc5c-4ba9-bd0a-ae09069f0914
Question ID
12/16
Models Correct
1
Valid Answer
75%
Success Rate
Reference Answer
Human-validated correct answer for this question
ln
Model Performance Comparison
See how different AI models performed on this question
| Model | Answer | KQL Query | Status | Attempts | Time | Cost |
|---|---|---|---|---|---|---|
| gemini-2.5-flash-preview-04-17 | ln | DeviceProcessEvents
| where ProcessCommandLine has "ln"
| where ProcessCommandLine has "/dev/null"
| project Timestamp, DeviceName, AccountName, ProcessCommandLine | Correct | 1 | 8.75s | 0.0026 |
| gpt-35-turbo | No answer provided | No query generated | Incorrect | 5 | 0.00s | 0.0111 |
| gpt-4-turbo-2024-04-09 | ln | DeviceProcessEvents
| where InitiatingProcessCommandLine has 'ln' and (InitiatingProcessCommandLine has '/dev/null' and InitiatingProcessCommandLine has '.bash_history')
| union (DeviceProcessEvents
| where ProcessCommandLine has 'ln' and (ProcessCommandLine has '/dev/null' and ProcessCommandLine has '.bash_history'))
| project TimeGenerated, DeviceName, FileName, FolderPath, ProcessCommandLine, InitiatingProcessFileName, InitiatingProcessCommandLine | Correct | 4 | 32.74s | 0.1963 |
| gpt-4.1 | ln | DeviceProcessEvents
| where ProcessCommandLine has "/dev/null" and ProcessCommandLine has ".bash_history"
| project TimeGenerated, DeviceName, AccountName, FileName, ProcessCommandLine, InitiatingProcessAccountName, InitiatingProcessCommandLine | Correct | 1 | 5.45s | 0.0119 |
| gpt-4.1-finetuned | No answer provided | No query generated | Incorrect | 5 | 0.00s | 0.0491 |
| gpt-4.1-mini | ln | DeviceProcessEvents
| where DeviceName endswith ".linux" or FolderPath has_any ("/bin", "/usr/bin", "/usr/local/bin")
| where ProcessCommandLine contains "/dev/null"
| where FileName in~ ("ln", "bash", "sh", "cat", "rm", "unlink")
| project TimeGenerated, DeviceName, InitiatingProcessAccountName, FileName, ProcessCommandLine
| order by TimeGenerated desc | Correct | 3 | 25.12s | 0.0068 |
| gpt-4.1-nano | No answer provided | No query generated | Incorrect | 5 | 0.00s | 0.0011 |
| gpt-4o | dash | DeviceProcessEvents
| where InitiatingProcessCommandLine contains "ln" and InitiatingProcessCommandLine contains "/dev/null"
| project TimeGenerated, DeviceName, InitiatingProcessCommandLine, InitiatingProcessAccountName, InitiatingProcessFileName, InitiatingProcessId | Incorrect | 1 | 3.13s | 0.0146 |
| grok-3-beta | ln | DeviceProcessEvents
| where TimeGenerated > ago(30d)
| where ProcessCommandLine contains 'ln' and ProcessCommandLine contains '/dev/null'
| join kind=inner (
DeviceInfo
| where OSPlatform == 'Linux'
) on DeviceId
| project Timestamp, DeviceName, AccountName, InitiatingProcessFileName, ProcessCommandLine
| order by Timestamp desc | Correct | 1 | 11.24s | 0.0228 |
| grok-3-mini-beta | ln | DeviceInfo
| where OSPlatform == "Linux"
| project DeviceId, DeviceName
| join kind=inner (DeviceProcessEvents) on DeviceId
| where ProcessCommandLine contains "ln" and ProcessCommandLine contains "/dev/null" and (ProcessCommandLine contains ".bash_history" or ProcessCommandLine contains ".history")
| project TimeGenerated, DeviceName, ProcessCommandLine, InitiatingProcessFileName, AccountName
| order by TimeGenerated desc
| limit 100 // Adjust limit as needed based on data volume and timerange | Correct | 1 | 12.70s | 0.0019 |
| o1-high | ln | DeviceProcessEvents
| where ActionType == "ProcessCreated"
| where isnotempty(ProcessCommandLine)
| join kind=inner (
DeviceInfo
| where OSPlatform =~ "Linux"
) on DeviceId
| where ProcessCommandLine has "/dev/null" and (ProcessCommandLine has "bash_history" or ProcessCommandLine has "history")
| project TimeGenerated, DeviceName, AccountName, FileName, ProcessCommandLine, InitiatingProcessCommandLine, FolderPath
| order by TimeGenerated desc | Correct | 1 | 58.43s | 0.3118 |
| o1-low | ln | DeviceInfo
| where OSPlatform == "Linux"
| distinct DeviceId
| join kind=inner (
DeviceProcessEvents
| where ActionType == "ProcessCreated" // Focus on new processes
| where ProcessCommandLine has "bash_history"
| where ProcessCommandLine has "/dev/null"
) on DeviceId
| project TimeGenerated, DeviceName, AccountName, ProcessCommandLine, InitiatingProcessCommandLine
| order by TimeGenerated desc | Correct | 1 | 31.51s | 0.2340 |
| o3-mini-high | ln | DeviceProcessEvents
| where ProcessCommandLine contains "/dev/null"
| where ProcessCommandLine has ".bash_history" or ProcessCommandLine has "history"
| project TimeGenerated, DeviceName, ProcessCommandLine, ProcessId
| sort by TimeGenerated desc | Correct | 1 | 20.97s | 0.0120 |
| o3-mini-low | ln | DeviceProcessEvents
| where tolower(ProcessCommandLine) has 'ln' and tolower(ProcessCommandLine) has '/dev/null'
| project TimeGenerated, DeviceName, AccountName, FileName, ProcessCommandLine, InitiatingProcessCommandLine, ProcessId, InitiatingProcessId
| sort by TimeGenerated desc | Correct | 2 | 20.62s | 0.0149 |
| o4-mini-high | ln | DeviceProcessEvents
| where ProcessCommandLine has "/dev/null" and ProcessCommandLine has ".bash_history"
| where FileName == "ln"
| project Timestamp, DeviceName, InitiatingProcessFileName, InitiatingProcessCommandLine, FileName, ProcessCommandLine, ProcessId, InitiatingProcessId | Correct | 1 | 26.02s | 0.0108 |
| o4-mini-low | ln | // 1. Identify Linux devices
let LinuxDevices = DeviceInfo
| where OSPlatform has "Linux"
| distinct DeviceId;
// 2. Look for ln invocations that link history files to /dev/null on those devices
DeviceProcessEvents
| where DeviceId in (LinuxDevices)
| where tolower(FileName) == "ln"
| where ProcessCommandLine has "/dev/null"
and (ProcessCommandLine has "history" or ProcessCommandLine has ".bash_history")
| project TimeGenerated, DeviceName, AccountName, ProcessId, FileName, ProcessCommandLine,
InitiatingProcessFileName, InitiatingProcessCommandLine
| sort by TimeGenerated desc | Correct | 3 | 78.47s | 0.0283 |