Question Analysis
On a Linux endpoint, you suspect malicious clearing of the bash history by redirecting from the null device. Explore process or file events to uncover the exact shell command that performed this action.
b1251c35-dcd3-4ea1-86da-36d27b54f31f
Question ID
7/16
Models Correct
1
Valid Answer
44%
Success Rate
Reference Answer
Human-validated correct answer for this question
cat /dev/null > ~/.bash_history
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 | sh -c "cat /dev/null > ~/.bash_history" | DeviceProcessEvents
| where ActionType == "ProcessCreated"
| where FileName in ("bash", "sh", "dash", "ksh", "zsh")
| where (ProcessCommandLine contains "/dev/null >" and (ProcessCommandLine contains ".bash_history" or ProcessCommandLine contains ".history"))
or ProcessCommandLine contains "history -c"
| project TimeGenerated, DeviceName, AccountName, ProcessCommandLine, InitiatingProcessCommandLine, InitiatingProcessFileName, InitiatingProcessCreationTime
| order by TimeGenerated desc | Correct | 1 | 20.49s | 0.0115 |
| gpt-35-turbo | No answer provided | No query generated | Incorrect | 5 | 0.00s | 0.0109 |
| gpt-4-turbo-2024-04-09 | sh -c "cat /dev/null > ~/.bash_history" | DeviceProcessEvents
| where ProcessCommandLine contains 'history' and ProcessCommandLine contains '/dev/null' and ProcessCommandLine contains '>'
| project DeviceName, AccountName, ProcessCommandLine, TimeGenerated | Correct | 2 | 15.76s | 0.0962 |
| gpt-4.1 | sh -c "cat /dev/null > ~/.bash_history" | DeviceProcessEvents
| where FileName in~ ("bash", "sh", "zsh", "dash")
| where ProcessCommandLine has_any ("> ~/.bash_history", ": > ~/.bash_history", "/dev/null > ~/.bash_history", "cat /dev/null > ~/.bash_history")
| project TimeGenerated, DeviceName, AccountName, FileName, ProcessCommandLine, InitiatingProcessCommandLine | Correct | 1 | 6.64s | 0.0118 |
| gpt-4.1-finetuned | sh -c "cat /dev/null > ~/.bash_history" | DeviceProcessEvents
| where ProcessCommandLine contains "> ~/.bash_history" or ProcessCommandLine contains " >~/.bash_history" or (ProcessCommandLine contains "bash_history" and ProcessCommandLine contains ">")
| sort by TimeGenerated desc
| project TimeGenerated, DeviceName, ProcessCommandLine, AccountName, InitiatingProcessCommandLine, InitiatingProcessAccountName
| top 10 by TimeGenerated desc
| Correct | 5 | 32.14s | 0.0344 |
| gpt-4.1-mini | No answer provided | No query generated | Incorrect | 5 | 0.00s | 0.0065 |
| gpt-4.1-nano | No answer provided | No query generated | Incorrect | 5 | 0.00s | 0.0019 |
| gpt-4o | sh -c "cat /dev/null > ~/.bash_history" | DeviceProcessEvents
| where InitiatingProcessCommandLine has "bash" and ProcessCommandLine contains "/dev/null"
| summarize arg_max(TimeGenerated, *) by DeviceId, ProcessId
| project TimeGenerated, DeviceName, InitiatingProcessCommandLine, ProcessCommandLine, InitiatingProcessAccountName, InitiatingProcessId | Correct | 3 | 30.35s | 0.0390 |
| grok-3-beta | No answer provided | No query generated | Incorrect | 5 | 0.00s | 0.0938 |
| grok-3-mini-beta | cat /dev/null > ~/.bash_history | let LinuxDevices = DeviceInfo | where OSPlatform == "Linux" | distinct DeviceId;
DeviceProcessEvents
| where DeviceId in (LinuxDevices)
| where ProcessCommandLine contains "history" and ProcessCommandLine contains "-c" and ProcessCommandLine contains "/dev/null"
| project TimeGenerated, DeviceName, AccountName, ProcessCommandLine, ProcessId
| order by TimeGenerated desc | Correct | 1 | 19.71s | 0.0018 |
| o1-high | cat | union DeviceProcessEvents, DeviceFileEvents
| where TimeGenerated >= ago(30d)
// Restrict to Linux devices
| join kind=inner (
DeviceInfo
| where OSPlatform =~ "Linux"
| distinct DeviceId
) on DeviceId
// Filter for command lines referencing /dev/null and bash_history,
// or file references indicating .bash_history modifications.
| where ( (isnotempty(ProcessCommandLine) and ProcessCommandLine has_all ("/dev/null", "bash_history"))
or (isnotempty(InitiatingProcessCommandLine) and InitiatingProcessCommandLine has_all ("/dev/null", "bash_history"))
or FileName == ".bash_history")
// Return key data fields
| project TimeGenerated, DeviceName, ActionType,
ProcessCommandLine, InitiatingProcessCommandLine,
FolderPath, FileName
// Sort and limit to reduce result size
| order by TimeGenerated desc
| limit 1000 | Incorrect | 3 | 90.57s | 0.6543 |
| o1-low | cat/dev/null>~/.bash_history | DeviceInfo
| where OSPlatform == "Linux"
| distinct DeviceId, DeviceName
| join kind=inner (
DeviceProcessEvents
| where ActionType == "ProcessCreated"
// Adjust to match desired pattern of suspicious commands
| where ProcessCommandLine has "/dev/null"
| where ProcessCommandLine has_any ("bash_history", ".bash_history")
) on DeviceId
| project TimeGenerated, DeviceName, AccountName, InitiatingProcessCommandLine, ProcessCommandLine
| order by TimeGenerated desc
| limit 100 | Incorrect | 2 | 74.46s | 0.5151 |
| o3-mini-high | cat | union withsource=TableName DeviceProcessEvents, DeviceFileEvents
| extend CommandLine = iif(isnotempty(InitiatingProcessCommandLine), InitiatingProcessCommandLine, ProcessCommandLine)
| where CommandLine contains "/dev/null" and CommandLine contains "history"
| project TimeGenerated, DeviceName, TableName, CommandLine, FileName, FolderPath, ActionType
| sort by TimeGenerated desc
| limit 200 | Incorrect | 2 | 102.21s | 0.0229 |
| o3-mini-low | cat | DeviceProcessEvents
| where ProcessCommandLine contains "/dev/null"
| where ProcessCommandLine contains "bash_history"
| project TimeGenerated, DeviceName, AccountName, ProcessCommandLine, InitiatingProcessCommandLine
| sort by TimeGenerated desc | Incorrect | 1 | 59.58s | 0.0172 |
| o4-mini-high | No answer provided | No query generated | Incorrect | 5 | 0.00s | 0.0463 |
| o4-mini-low | cat /dev/null > ~/.bash_history | let proc = DeviceProcessEvents
| where ProcessCommandLine contains "/dev/null" and ProcessCommandLine contains "bash_history"
or ProcessCommandLine contains "history -c"
| project TimeGenerated, DeviceName, User = InitiatingProcessAccountName, CommandLine = ProcessCommandLine;
let file = DeviceFileEvents
| where FileName endswith ".bash_history" and ActionType in ("FileCreated", "FileModified")
| project TimeGenerated, DeviceName, User = InitiatingProcessAccountName, CommandLine = InitiatingProcessCommandLine, File = FileName, ActionType;
proc
| union file
| sort by TimeGenerated desc | Correct | 1 | 42.52s | 0.0132 |