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# Uncommon Linux remote shell command execution
### Synopsis
| Field | Value |
| -------------------- | ----------------------------------------------------------------------------------------------------------------------------- |
| Activation Period | 14 Days |
| Training Period | 30 Days |
| Test Period | N/A (single event) |
| Deduplication Period | 1 Day |
| Required Data | XDR Agent |
| Detector Tags | Shell Analytics |
| ATT\&CK Tactic | Execution (TA0002), Lateral Movement (TA0008) |
| ATT\&CK Technique | Command and Scripting Interpreter: Unix Shell (T1059.004), Command and Scripting Interpreter (T1059), Remote Services (T1021) |
| Severity | Informational |
### Description
An unusual process execution of a shell command on Linux from a remote source. This action may indicate possible exploitation or shell command execution via a backdoor.
### Attacker's Goals
An attacker may attempt to execute a malicious shell command on the system.
### Investigative actions
* Check whether the executing process is benign and if this was a desired behavior as part of its normal execution flow.
* Check the executed shell command (and possible child processes) for malicious actions.
### Variations
Uncommon Linux remote shell command execution, possibly running LinPEAS
**Synopsis**
| Field | Value |
| ----------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| ATT\&CK Tactic | Execution (TA0002), Lateral Movement (TA0008), Privilege Escalation (TA0004) |
| ATT\&CK Technique | Command and Scripting Interpreter: Unix Shell (T1059.004), Command and Scripting Interpreter (T1059), Remote Services (T1021), Exploitation for Privilege Escalation (T1068) |
| Severity | High |
**Description**
An unusual process execution of a shell command on Linux from a remote source. This action may indicate possible exploitation or shell command execution via a backdoor.
**Attacker's Goals**
An attacker may attempt to execute a malicious shell command on the system.
**Investigative actions**
* Check whether the executing process is benign and if this was a desired behavior as part of its normal execution flow.
* Check the executed shell command (and possible child processes) for malicious actions.
Uncommon Linux remote shell command execution using an exploitation tool
**Synopsis**
| Field | Value |
| ----------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| ATT\&CK Tactic | Execution (TA0002), Lateral Movement (TA0008) |
| ATT\&CK Technique | Command and Scripting Interpreter: Unix Shell (T1059.004), Command and Scripting Interpreter (T1059), Remote Services (T1021), Exploitation of Remote Services (T1210) |
| Severity | High |
**Description**
An unusual process execution of a shell command on Linux from a remote source. This action may indicate possible exploitation or shell command execution via a backdoor.
**Attacker's Goals**
An attacker may attempt to execute a malicious shell command on the system.
**Investigative actions**
* Check whether the executing process is benign and if this was a desired behavior as part of its normal execution flow.
* Check the executed shell command (and possible child processes) for malicious actions.
Uncommon Linux remote shell command execution executing a reverse interactive shell
**Synopsis**
| Field | Value |
| ----------------- | ----------------------------------------------------------------------------------------------------------------------------- |
| ATT\&CK Tactic | Execution (TA0002), Lateral Movement (TA0008) |
| ATT\&CK Technique | Command and Scripting Interpreter: Unix Shell (T1059.004), Command and Scripting Interpreter (T1059), Remote Services (T1021) |
| Severity | Medium |
**Description**
An unusual process execution of a shell command on Linux from a remote source. This action may indicate possible exploitation or shell command execution via a backdoor.
**Attacker's Goals**
An attacker may attempt to execute a malicious shell command on the system.
**Investigative actions**
* Check whether the executing process is benign and if this was a desired behavior as part of its normal execution flow.
* Check the executed shell command (and possible child processes) for malicious actions.
Uncommon Linux remote shell command execution downloading a shell script
**Synopsis**
| Field | Value |
| ----------------- | ----------------------------------------------------------------------------------------------------------------------------- |
| ATT\&CK Tactic | Execution (TA0002), Lateral Movement (TA0008) |
| ATT\&CK Technique | Command and Scripting Interpreter: Unix Shell (T1059.004), Command and Scripting Interpreter (T1059), Remote Services (T1021) |
| Severity | Medium |
**Description**
An unusual process execution of a shell command on Linux from a remote source. This action may indicate possible exploitation or shell command execution via a backdoor.
**Attacker's Goals**
An attacker may attempt to execute a malicious shell command on the system.
**Investigative actions**
* Check whether the executing process is benign and if this was a desired behavior as part of its normal execution flow.
* Check the executed shell command (and possible child processes) for malicious actions.
Uncommon Linux remote shell command execution disabling firewall
**Synopsis**
| Field | Value |
| ----------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------ |
| ATT\&CK Tactic | Execution (TA0002), Lateral Movement (TA0008), Defense Evasion (TA0005) |
| ATT\&CK Technique | Command and Scripting Interpreter: Unix Shell (T1059.004), Command and Scripting Interpreter (T1059), Remote Services (T1021), Impair Defenses (T1562) |
| Severity | Low |
**Description**
An unusual process execution of a shell command on Linux from a remote source. This action may indicate possible exploitation or shell command execution via a backdoor.
**Attacker's Goals**
An attacker may attempt to execute a malicious shell command on the system.
**Investigative actions**
* Check whether the executing process is benign and if this was a desired behavior as part of its normal execution flow.
* Check the executed shell command (and possible child processes) for malicious actions.
Uncommon Linux remote shell command execution taking a screenshot
**Synopsis**
| Field | Value |
| ----------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------- |
| ATT\&CK Tactic | Execution (TA0002), Lateral Movement (TA0008), Collection (TA0009) |
| ATT\&CK Technique | Command and Scripting Interpreter: Unix Shell (T1059.004), Command and Scripting Interpreter (T1059), Remote Services (T1021), Screen Capture (T1113) |
| Severity | Low |
**Description**
An unusual process execution of a shell command on Linux from a remote source. This action may indicate possible exploitation or shell command execution via a backdoor.
**Attacker's Goals**
An attacker may attempt to execute a malicious shell command on the system.
**Investigative actions**
* Check whether the executing process is benign and if this was a desired behavior as part of its normal execution flow.
* Check the executed shell command (and possible child processes) for malicious actions.
Uncommon Linux remote shell command execution possibly running from an XZ backdoor
**Synopsis**
| Field | Value |
| ----------------- | ----------------------------------------------------------------------------------------------------------------------------- |
| ATT\&CK Tactic | Execution (TA0002), Lateral Movement (TA0008) |
| ATT\&CK Technique | Command and Scripting Interpreter: Unix Shell (T1059.004), Command and Scripting Interpreter (T1059), Remote Services (T1021) |
| Severity | Low |
**Description**
An unusual process execution of a shell command on Linux from a remote source. This action may indicate possible exploitation or shell command execution via a backdoor.
**Attacker's Goals**
An attacker may attempt to execute a malicious shell command on the system.
**Investigative actions**
* Check whether the executing process is benign and if this was a desired behavior as part of its normal execution flow.
* Check the executed shell command (and possible child processes) for malicious actions.
Uncommon Linux remote shell command execution running as root
**Synopsis**
| Field | Value |
| ----------------- | ----------------------------------------------------------------------------------------------------------------------------- |
| ATT\&CK Tactic | Execution (TA0002), Lateral Movement (TA0008) |
| ATT\&CK Technique | Command and Scripting Interpreter: Unix Shell (T1059.004), Command and Scripting Interpreter (T1059), Remote Services (T1021) |
| Severity | Low |
**Description**
An unusual process execution of a shell command on Linux from a remote source. This action may indicate possible exploitation or shell command execution via a backdoor.
**Attacker's Goals**
An attacker may attempt to execute a malicious shell command on the system.
**Investigative actions**
* Check whether the executing process is benign and if this was a desired behavior as part of its normal execution flow.
* Check the executed shell command (and possible child processes) for malicious actions.
Uncommon Linux remote shell command execution setting a scheduled task
**Synopsis**
| Field | Value |
| ----------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------- |
| ATT\&CK Tactic | Execution (TA0002), Lateral Movement (TA0008) |
| ATT\&CK Technique | Command and Scripting Interpreter: Unix Shell (T1059.004), Command and Scripting Interpreter (T1059), Remote Services (T1021), Scheduled Task/Job (T1053) |
| Severity | Low |
**Description**
An unusual process execution of a shell command on Linux from a remote source. This action may indicate possible exploitation or shell command execution via a backdoor.
**Attacker's Goals**
An attacker may attempt to execute a malicious shell command on the system.
**Investigative actions**
* Check whether the executing process is benign and if this was a desired behavior as part of its normal execution flow.
* Check the executed shell command (and possible child processes) for malicious actions.
Uncommon Linux remote shell command execution running a process kill command
**Synopsis**
| Field | Value |
| ----------------- | ----------------------------------------------------------------------------------------------------------------------------- |
| ATT\&CK Tactic | Execution (TA0002), Lateral Movement (TA0008) |
| ATT\&CK Technique | Command and Scripting Interpreter: Unix Shell (T1059.004), Command and Scripting Interpreter (T1059), Remote Services (T1021) |
| Severity | Low |
**Description**
An unusual process execution of a shell command on Linux from a remote source. This action may indicate possible exploitation or shell command execution via a backdoor.
**Attacker's Goals**
An attacker may attempt to execute a malicious shell command on the system.
**Investigative actions**
* Check whether the executing process is benign and if this was a desired behavior as part of its normal execution flow.
* Check the executed shell command (and possible child processes) for malicious actions.
Uncommon Linux remote shell command execution loading a kernel module
**Synopsis**
| Field | Value |
| ----------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| ATT\&CK Tactic | Execution (TA0002), Lateral Movement (TA0008), Persistence (TA0003), Privilege Escalation (TA0004) |
| ATT\&CK Technique | Command and Scripting Interpreter: Unix Shell (T1059.004), Command and Scripting Interpreter (T1059), Remote Services (T1021), Boot or Logon Autostart Execution: Kernel Modules and Extensions (T1547.006) |
| Severity | Informational |
**Description**
An unusual process execution of a shell command on Linux from a remote source. This action may indicate possible exploitation or shell command execution via a backdoor.
**Attacker's Goals**
An attacker may attempt to execute a malicious shell command on the system.
**Investigative actions**
* Check whether the executing process is benign and if this was a desired behavior as part of its normal execution flow.
* Check the executed shell command (and possible child processes) for malicious actions.
Uncommon Linux remote shell command execution via non-SSH or SSH on a non-standard port
**Synopsis**
| Field | Value |
| ----------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------- |
| ATT\&CK Tactic | Execution (TA0002), Lateral Movement (TA0008), Command and Control (TA0011) |
| ATT\&CK Technique | Command and Scripting Interpreter: Unix Shell (T1059.004), Command and Scripting Interpreter (T1059), Remote Services (T1021), Non-Standard Port (T1571) |
| Severity | Informational |
**Description**
An unusual process execution of a shell command on Linux from a remote source. This action may indicate possible exploitation or shell command execution via a backdoor.
**Attacker's Goals**
An attacker may attempt to execute a malicious shell command on the system.
**Investigative actions**
* Check whether the executing process is benign and if this was a desired behavior as part of its normal execution flow.
* Check the executed shell command (and possible child processes) for malicious actions.
Uncommon Linux remote shell command execution running a network tool
**Synopsis**
| Field | Value |
| ----------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| ATT\&CK Tactic | Execution (TA0002), Lateral Movement (TA0008), Discovery (TA0007) |
| ATT\&CK Technique | Command and Scripting Interpreter: Unix Shell (T1059.004), Command and Scripting Interpreter (T1059), Remote Services (T1021), Network Service Discovery (T1046) |
| Severity | Informational |
**Description**
An unusual process execution of a shell command on Linux from a remote source. This action may indicate possible exploitation or shell command execution via a backdoor.
**Attacker's Goals**
An attacker may attempt to execute a malicious shell command on the system.
**Investigative actions**
* Check whether the executing process is benign and if this was a desired behavior as part of its normal execution flow.
* Check the executed shell command (and possible child processes) for malicious actions.
Uncommon Linux remote shell command execution trying to gather information about the system
**Synopsis**
| Field | Value |
| ----------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| ATT\&CK Tactic | Execution (TA0002), Lateral Movement (TA0008), Discovery (TA0007) |
| ATT\&CK Technique | Command and Scripting Interpreter: Unix Shell (T1059.004), Command and Scripting Interpreter (T1059), Remote Services (T1021), System Information Discovery (T1082), Software Discovery (T1518), Account Discovery (T1087), Account Discovery: Local Account (T1087.001), System Owner/User Discovery (T1033), Network Service Discovery (T1046), System Network Configuration Discovery (T1016), System Network Connections Discovery (T1049), File and Directory Discovery (T1083), Peripheral Device Discovery (T1120), Software Discovery: Security Software Discovery (T1518.001) |
| Severity | Informational |
**Description**
An unusual process execution of a shell command on Linux from a remote source. This action may indicate possible exploitation or shell command execution via a backdoor.
**Attacker's Goals**
An attacker may attempt to execute a malicious shell command on the system.
**Investigative actions**
* Check whether the executing process is benign and if this was a desired behavior as part of its normal execution flow.
* Check the executed shell command (and possible child processes) for malicious actions.
Uncommon Linux remote shell command execution, possibly granting file execution permissions
**Synopsis**
| Field | Value |
| ----------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| ATT\&CK Tactic | Execution (TA0002), Lateral Movement (TA0008), Defense Evasion (TA0005) |
| ATT\&CK Technique | Command and Scripting Interpreter: Unix Shell (T1059.004), Command and Scripting Interpreter (T1059), Remote Services (T1021), File and Directory Permissions Modification (T1222) |
| Severity | Informational |
**Description**
An unusual process execution of a shell command on Linux from a remote source. This action may indicate possible exploitation or shell command execution via a backdoor.
**Attacker's Goals**
An attacker may attempt to execute a malicious shell command on the system.
**Investigative actions**
* Check whether the executing process is benign and if this was a desired behavior as part of its normal execution flow.
* Check the executed shell command (and possible child processes) for malicious actions.
---
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