anavem.
S
Medium RiskWindowsLegitimateCommonly Abused
slack.exeCOMMUNICATION APP

slack.exe - Slack Communication App Security Analysis

slack.exe is the Slack workplace communication desktop client. Attackers target Slack for token theft, data exfiltration via webhooks, and malware distribution through shared files. Slack's API can be abused for C2 communication over trusted channels.

3viewsLast verified: Jan 18, 2026

Risk Summary

MEDIUM priority for SOC triage. slack.exe is a legitimate communication app that can be abused for C2 and data exfiltration. Monitor for Slack token theft, webhook abuse, and Slack API calls from non-Slack processes.

Overview

What is slack.exe?

Slack is a workplace communication platform.

Core Functions

Communication:

  • Team messaging
  • File sharing
  • Integrations/bots
  • Webhooks

Security Significance

  • Token Value: Access to corporate data
  • Webhook Abuse: C2 via webhooks
  • Data Exfil: File sharing for exfil
  • Electron-Based: JS injection risks

Normal Behavior

Normal Behavior

Expected Process State

PropertyExpected Value
Path%LOCALAPPDATA%\slack\slack.exe
Parentexplorer.exe
UserLogged-in user
Networkslack.com

Token Location

%APPDATA%\Slack\storage\

Common Locations

C:\Users\*\AppData\Local\slack\slack.exe

Suspicious Indicators

Legitimate vs Suspicious

LEGITIMATE

Path:        %LOCALAPPDATA%\slack\slack.exe
Network:     slack.com
Behavior:    Normal messaging

SUSPICIOUS

Path:        C:\Temp\slack.exe
Behavior:    Token files accessed by other process
             Webhook POST from non-Slack process

Abuse Techniques

Attack Techniques

Technique #1: Token Theft (T1528)

Stealing Slack authentication tokens.

Technique #2: Webhook C2 (T1102)

C2 via Slack Webhooks:

POST /services/T.../B.../...

Technique #3: Data Exfiltration (T1567)

Exfiltrating data via file uploads.

Detection Guidance

Detection Strategies

Priority #1: Token Access

Process != "slack.exe" AND
FileAccess CONTAINS "Slack\storage"
→ ALERT: HIGH - Token theft

Priority #2: Non-Slack Webhook Traffic

Process != "slack.exe" AND
Network = "hooks.slack.com"
→ ALERT: HIGH - C2 via Slack

Remediation Steps

Protection and Remediation

Defense: Monitor Integrations

Review Slack app integrations regularly.

If Compromise Suspected

  1. Revoke active sessions
  2. Rotate workspace tokens
  3. Audit integrations
  4. Review message history

Investigation Checklist

Investigation Checklist

  • Verify slack.exe path
  • Check for token file access
  • Review webhook activity
  • Audit integrations

MITRE ATT&CK Techniques

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