Rundll32.exe executes a rare unsigned module

Cortex XDR Analytics Alert Reference by Alert name

Product
Cortex XDR
Last date published
2024-06-04
Category
Analytics Alert Reference
Order
Alert name

Synopsis

Activation Period

14 Days

Training Period

30 Days

Test Period

N/A (single event)

Deduplication Period

1 Day

Required Data

  • Requires:
    • XDR Agent

Detection Modules

ATT&CK Tactic

Defense Evasion (TA0005)

ATT&CK Technique

System Binary Proxy Execution: Rundll32 (T1218.011)

Severity

Low

Description

Rundll32.exe executes a rare unsigned module, which can indicate an attacker's malicious execution.

Attacker's Goals

Evading detections by running code from a signed Microsoft executable.

Investigative actions

Check whether the loaded module with the corresponding hash is benign, and if this was a desired behavior as part of its normal execution flow.

Variations

Rundll32.exe executes a rare unsigned module with very high entropy

Synopsis

ATT&CK Tactic

Defense Evasion (TA0005)

ATT&CK Technique

System Binary Proxy Execution: Rundll32 (T1218.011)

Severity

Medium

Description

Rundll32.exe executes a rare unsigned module, which can indicate an attacker's malicious execution. The module executed by Rundll32 has very high entropy.

Attacker's Goals

Evading detections by running code from a signed Microsoft executable.

Investigative actions

Check whether the loaded module with the corresponding hash is benign, and if this was a desired behavior as part of its normal execution flow.


Rundll32.exe executes a rare unsigned module with suspicious characteristics

Synopsis

ATT&CK Tactic

Defense Evasion (TA0005)

ATT&CK Technique

System Binary Proxy Execution: Rundll32 (T1218.011)

Severity

Medium

Description

Rundll32.exe executes a rare unsigned module, which can indicate an attacker's malicious execution.

Attacker's Goals

Evading detections by running code from a signed Microsoft executable.

Investigative actions

Check whether the loaded module with the corresponding hash is benign, and if this was a desired behavior as part of its normal execution flow.