Globally uncommon image load from a signed process

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	Global Anomaly Analytics, DLL Hijacking Analytics
ATT&CK Tactic	Defense Evasion (TA0005)
ATT&CK Technique	System Binary Proxy Execution (T1218), Hijack Execution Flow: DLL (T1574.001)
Severity	Informational

Description

A signed process loaded a DLL that, on a global level, it usually doesn't load.

Attacker's Goals

Attackers may use various methods to execute code in the context of a signed process to avoid detection.

Investigative actions

• Check if the actor process loaded a suspicious DLL before the alert.
• Check if the actor process was injected before the alert.
• Check if the process execution and connections are legitimate.

Variations

Globally uncommon image load from a signed process from a known vendor

Synopsis

Field	Value
ATT&CK Tactic	Defense Evasion (TA0005)
ATT&CK Technique	System Binary Proxy Execution (T1218), Hijack Execution Flow: DLL (T1574.001)
Severity	Medium

Description

A signed process loaded a DLL that, on a global level, it usually doesn't load.

Attacker's Goals

Attackers may use various methods to execute code in the context of a signed process to avoid detection.

Investigative actions

• Check if the actor process loaded a suspicious DLL before the alert.
• Check if the actor process was injected before the alert.
• Check if the process execution and connections are legitimate.

Globally uncommon unsigned image side loaded to a signed process

Synopsis

Field	Value
ATT&CK Tactic	Defense Evasion (TA0005)
ATT&CK Technique	System Binary Proxy Execution (T1218), Hijack Execution Flow: DLL (T1574.001)
Severity	Medium

Description

A signed process side loaded an unsigned DLL that, on a global level, it usually doesn't load.

Attacker's Goals

Attackers may use various methods to execute code in the context of a signed process to avoid detection.

Investigative actions

• Check if the actor process loaded a suspicious DLL before the alert.
• Check if the actor process was injected before the alert.
• Check if the process execution and connections are legitimate.

Globally uncommon and very rare image load from a signed process

Synopsis

Field	Value
ATT&CK Tactic	Defense Evasion (TA0005)
ATT&CK Technique	System Binary Proxy Execution (T1218), Hijack Execution Flow: DLL (T1574.001)
Severity	Medium

Description

A signed process loaded a DLL that, on a global level, it usually doesn't load.

Attacker's Goals

Attackers may use various methods to execute code in the context of a signed process to avoid detection.

Investigative actions

• Check if the actor process loaded a suspicious DLL before the alert.
• Check if the actor process was injected before the alert.
• Check if the process execution and connections are legitimate.

Globally uncommon image load from an injected thread in a signed process

Synopsis

Field	Value
ATT&CK Tactic	Defense Evasion (TA0005)
ATT&CK Technique	System Binary Proxy Execution (T1218), Hijack Execution Flow: DLL (T1574.001), Process Injection (T1055)
Severity	Low

Description

An injected thread in a signed process loaded a DLL that, on a global level, it usually doesn't load.

Attacker's Goals

Attackers may use various methods to execute code in the context of a signed process to avoid detection.

Investigative actions

• Check if the actor process loaded a suspicious DLL before the alert.
• Check if the actor process was injected before the alert.
• Check if the process execution and connections are legitimate.

Globally uncommon DLL was downloaded from an uncommon source and loaded by a signed process

Synopsis

Field	Value
ATT&CK Tactic	Defense Evasion (TA0005)
ATT&CK Technique	System Binary Proxy Execution (T1218), Hijack Execution Flow: DLL (T1574.001)
Severity	Low

Description

A signed process loaded a DLL that, on a global level, it usually doesn't load.

Attacker's Goals

Attackers may use various methods to execute code in the context of a signed process to avoid detection.

Investigative actions

• Check if the actor process loaded a suspicious DLL before the alert.
• Check if the actor process was injected before the alert.
• Check if the process execution and connections are legitimate.