find-util-remove

name	find-UTIL_Remove
description	Find and identify the UTIL_Remove function in CS2 binary using IDA Pro MCP. Use this skill when reverse engineering CS2 server.dll or server.so to locate the UTIL_Remove function by analyzing the Molotov extinguish pattern and identifying the finalization call after particle effects.

Find UTIL_Remove

Locate UTIL_Remove in CS2 server.dll or server.so using IDA Pro MCP tools.

Method

1. Search for the extinguish event string:

   mcp__ida-pro-mcp__find_regex pattern="Molotov\.Extinguish"
   

2. Get cross-references to the string:

   mcp__ida-pro-mcp__xrefs_to addrs="<string_addr>"
   

3. Decompile the referencing function:

   mcp__ida-pro-mcp__decompile addr="<function_addr>"
   

4. Analyze the decompiled function to identify the extinguish-finalization pattern:

   Look for this sequence:

   • A call with "Molotov.Extinguish" string
   • A call to sub_1576A10 with "particles/inferno_fx/extinguish_fire.vpcf" particle resource
   • Positional data from object pointer (e.g., *(double *)(a1 + offset))
   • Immediately after: A function call taking only this (a1) as argument

   This final call is UTIL_Remove.

5. Rename the function:

   mcp__ida-pro-mcp__rename batch={"func": [{"addr": "<util_remove_addr>", "name": "UTIL_Remove"}]}
   

6. Generate and validate unique signature:

   ALWAYS Use SKILL /generate-signature-for-function to generate a robust and unique signature for the function.

7. Write IDA analysis output as YAML beside the binary:

   ALWAYS Use SKILL /write-func-as-yaml to write the analysis results.

   Required parameters:

   • func_name: UTIL_Remove
   • func_addr: The function address from step 4
   • func_sig: The validated signature from step 6

Signature Pattern

The function is identified by analyzing the extinguish-finalization pattern:

sub_1857410(&v52, a1, "Molotov.Extinguish", 0, 1, &v67, 0.0);
sub_1576A10(
  "particles/inferno_fx/extinguish_fire.vpcf",
  0, 0, 0xFFFFFFFFLL, 0, 0,
  *(double *)(a1 + 5584),
  *(float *)(a1 + 5592),
  *(double *)&v58,
  *((float *)&v58 + 2));
sub_14FE9C0(a1);  // <- This is UTIL_Remove

Function Characteristics

• Parameters: (this) where this is an entity pointer
• Purpose: Entity removal/cleanup function called after extinguish effects
• Context: Part of the Molotov/Incendiary grenade extinguish workflow
• Call Pattern: Takes only the entity pointer, no additional arguments
• Position: Called immediately after particle effect spawn, before function return

Output YAML Format

The output YAML filename depends on the platform:

• server.dll → UTIL_Remove.windows.yaml
• server.so → UTIL_Remove.linux.yaml

func_va: 0x14fe9c0       # Virtual address of the function - This can change when game updates.
func_rva: 0x14fe9c0      # Relative virtual address (VA - image base) - This can change when game updates.
func_size: 0x21          # Function size in bytes - This can change when game updates.
func_sig: 48 89 FE 48 85 FF 74 18 48 8D 05 ?? ?? ?? ?? 48 8B 38 E9 ?? ?? ?? ??  # Unique byte signature for pattern scanning