Possible malicious .NET compilation started by a commonly abused 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
ATT&CK Tactic	Stealth (TA0005)
ATT&CK Technique	Obfuscated Files or Information: Compile After Delivery (T1027.004)
Severity	Medium

Description

Attackers may use csc.exe to compile payloads on a compromised machine.

Attacker's Goals

Compile payloads on the host to evade detection.

Investigative actions

• Investigate the payload being compiled.
• Check whether the executing process is benign and if this was a desired behavior as part of its normal execution flow.