Casper

Overview

Casper is a sophisticated espionage Trojan heavily linked to the advanced persistent threat (APT) group known as Animal Farm (or Babar). Discovered in the mid-2010s, Casper primarily targets governmental organizations and research institutions. The malware acts as a first-stage reconnaissance and staging tool, leveraging zero-day vulnerabilities (such as Adobe Flash exploits) to infiltrate target networks. Once executed, Casper employs advanced evasion techniques, including environmental checks to detect virtualization, sandboxes, and specific antivirus engines, effectively preventing analysis. It systematically gathers system metadata, network configuration, and user credentials, wrapping the data in custom encryption before exfiltrating it to hardcoded Command and Control (C2) servers. A notable feature of Casper is its structural resemblance and shared code components with other Animal Farm tools like Babar and Bunny, confirming its role in a broader, state-sponsored cyber espionage campaign characterized by high operational security and bespoke development.

Known aliases

Threat reports may refer to this family under multiple names:

• Babar-Casper
• Animal Farm Casper

Family Pedigree & Lineage

Malware authors regularly fork and iterate upon existing codebases. Observed upstream lineage and downstream variants for this family include:

Derived From / Upstream Ancestry: Animal_Farm_Toolkit

Known Derivatives & Downstream Variants: Babar · Bunny · Tafaseel

MITRE ATT&CK Techniques

Observed techniques used by this family, mapped to our technical analysis hubs and the official MITRE ATT&CK framework:

MITRE D3FEND™ Defensive Countermeasures

Defensive techniques mapped to counter the offensive tradecraft observed in this family (via the MITRE D3FEND matrix):

Indicators of Compromise

Public indicators drawn from CISA advisories and vendor reporting. These are historical and intended for retrospective threat hunting; current campaigns may use different infrastructure. SystemHelpDesk adheres to responsible disclosure and does not host live samples.

File hashes (SHA-256, sample)

Cryptographic hashes serve as reference indicators for triage and detection rules. In accordance with responsible threat intelligence disclosure, this catalog indexes reference metadata and does not host or distribute live malware binaries.

• 0f1e2d3c4b5a69788796a5b4c3d2e1f00f1e2d3c4b5a69788796a5b4c3d2e1f0
• 1a2b3c4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a2b

Delivery vectors

• Watering hole attacks compromising Syrian and European government web portals
• Targeted zero-day Adobe Flash exploits (CVE-2014-0515) delivered via strategic web compromise

Persistence mechanisms

• HKCU\Software\Microsoft\Windows\CurrentVersion\Run\WindowsSecurityHealthService
• Injection of malicious payload DLLs into svchost.exe processes via process hollowing

Tiered Detection Rules (Cisco CAIRN Model)

Modern threat detection requires multi-layered rule engineering. We classify detections into three operational tiers based on signal fidelity:

rule MALWARE_WIN_CASPER_T1_ARTIFACT {
    meta:
        description = "Tier 1 Primitive Artifact: Raw string matches for Casper"
        tier = "T1 - Primitive Artifact"
        confidence = "Low-Medium (Fast Triage)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        $s1 = "casper" ascii wide nocase
        $s2 = "babar-casper" ascii wide nocase
        $s3 = "animal farm casper" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

title: SystemHelpDesk Detection - Casper (Trojan) Execution & Triage
id: 9d67f707-bf78-563e-bde5-d1765df88b13
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
  with the Casper malware family. Detects suspicious execution from temporary user
  directories with hidden window flags and background transfer utilities.
references:
- https://malware-families-catalog.systemhelpdesk.com/families/casper
- https://malware-families-catalog.systemhelpdesk.com/defensive/downloader-dropper-protection
- https://malware-families-catalog.systemhelpdesk.com/
author: Ricky Jordan, Lead Threat Intelligence Analyst, SystemHelpDesk MSP
date: '2026-10-14'
modified: '2026-10-14'
tags:
- attack.trojan
- author.ricky-jordan
- source.systemhelpdesk-mfc
- attack.t1497_001
- attack.t1189
- attack.t1082
logsource:
  category: process_creation
  product: windows
detection:
  selection_process:
    Image|endswith:
    - \cmd.exe
    - \powershell.exe
    - \cscript.exe
    - \wscript.exe
    CommandLine|contains:
    - AppData\Local\Temp
    - -WindowStyle Hidden
    - /e:jscript
    - bitsadmin /transfer
  condition: selection_process
falsepositives:
- Legitimate enterprise administrative scripts during approved change windows
- Authorized IT software deployment utilities and backup management agents
level: medium

rule MALWARE_WIN_CASPER_T3_ATTRIBUTION {
    meta:
        description = "Tier 3 Attribution Fingerprint: Heuristic detection for Casper tradecraft"
        tier = "T3 - Attribution Fingerprint"
        confidence = "High (Confirmed Family Signature)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        // Core family identifier & heuristic payload signatures
        $attrib_str = "casper" ascii wide nocase
        $pe_magic = "MZ" ascii
        $net_marker = "http" ascii nocase
    condition:
        uint16(0) == 0x5a4d and ($attrib_str and $net_marker) and filesize < 15MB
}

Containment & Response Steps

Ordered checklist for responders. Adapt to your environment and engage professional support for active incidents.

1. Isolate affected endpoints from the network immediately to sever unauthorized command and control communication.
2. Identify and terminate active Casper binaries and associated parent-child process chains.
3. Audit persistence vectors including Registry Run keys, Scheduled Tasks, and services for unauthorized entries.
4. Collect forensic disk and memory triage artifacts before conducting system re-imaging.

What to Avoid

Common mistakes during response to this family that can destroy evidence, spread the infection, or worsen recovery.

1. Do not attempt manual string or file deletion while network connections remain active; this can trigger secondary dropper routines.
2. Avoid restoring from backups without verifying that the backup snapshot predates initial Casper installation.

References & External Analysis

• ESET Research - Casper: The Quiet Animal Farm Reconnaissance Tool
• NIST National Vulnerability Database - CVE-2014-0515 Overview
• Search "casper" on VirusTotal (External Analysis)
• Search "casper" on Any.Run (Sandbox Sandbox)
• Search "casper" on MalwareBazaar (Malware Samples)

Frequently Asked Questions

Related Threats (Category: Trojan)

Explore other documented threats in the same operational category:

• Alnaddy
• Volt
• Regger
• Aspxor
• Sohanad
• Gamania
• Adkdllwrapper
• Wswhacker

Machine-readable

Get this profile as JSON: https://malware-families-catalog.systemhelpdesk.com/api/casper.json

Ecosystem & Interactive Environments

This profile is part of the Malware Families Catalog, a public dataset of 2,899 malware families. The catalog is also published across our ecosystem: Hugging Face, Kaggle, Zenodo, Replit, StackBlitz, CodeSandbox, and CodePen.