Pliskal

Overview

Pliskal (tracked across enterprise antivirus research telemetry under designations including Trojan:Win32/Pliskal, Trojan:Win32/Pliskal.A, and TrojanDownloader:Win32/Pliskal) is a stealthy Windows trojan downloader and backdoor. First observed in targeted cybercrime campaigns, Pliskal establishes a foothold on victim machines through malicious email attachments disguised as administrative invoices or bundled inside repackaged pirated utility installers. Upon execution, Pliskal performs defensive evasion routines, checking for the presence of virtualized sandbox environments and analysis debuggers. It establishes persistence by writing Run registry values under HKCU\Software\Microsoft\Windows\CurrentVersion\Run. Pliskal gathers basic host reconnaissance data—including machine hostname, Windows build version, local IP address, and installed security software—and transmits this telemetry to remote command-and-control (C2) servers via HTTP/HTTPS POST requests. In return, the C2 server issues instructions to download, stage, and execute secondary malicious payloads, including credential stealers, keyloggers, and ransomware, using CreateProcessW and ShellExecuteW APIs.

Known aliases

Threat reports may refer to this family under multiple names:

• Trojan:Win32/Pliskal
• Trojan:Win32/Pliskal.A
• TrojanDownloader:Win32/Pliskal
• Win32/Pliskal
• Backdoor.Win32.Pliskal

MITRE ATT&CK Techniques

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

Tactical Mitigations

Based on the techniques used by this family, consider the following defensive strategies:

• T1059.003: Restrict execution of Windows Command Shell (cmd.exe) and block unauthorized batch scripts.
• T1071.001: Implement web filtering and SSL/TLS inspection to detect malicious command and control (C2) traffic hiding in HTTP/HTTPS.
• T1105: Implement network intrusion detection systems (NIDS) and host-based firewalls to block unauthorized inbound or outbound file transfers.

MITRE D3FEND™ Defensive Countermeasures

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

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_PLISKAL_T1_ARTIFACT {
    meta:
        description = "Tier 1 Primitive Artifact: Raw string matches for Pliskal"
        tier = "T1 - Primitive Artifact"
        confidence = "Low-Medium (Fast Triage)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        $s1 = "pliskal" ascii wide nocase
        $s2 = "trojan:win32/pliskal" ascii wide nocase
        $s3 = "trojan:win32/pliskal.a" ascii wide nocase
        $s4 = "trojandownloader:win32/pliskal" ascii wide nocase
        $s5 = "win32/pliskal" ascii wide nocase
        $s6 = "backdoor.win32.pliskal" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

title: SystemHelpDesk Detection - Pliskal (Trojan) Execution & Triage
id: 149af7fe-4c68-5861-ae4e-3bd1b5e9f400
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
  with the Pliskal 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/pliskal
- 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.t1059_003
- attack.t1071_001
- attack.t1547_001
- attack.t1082
- attack.t1105
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_PLISKAL_T3_ATTRIBUTION {
    meta:
        description = "Tier 3 Attribution Fingerprint: Heuristic detection for Pliskal 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 = "pliskal" 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. Disconnect the affected host from the local network and terminate active internet connections.
2. Kill unauthorized processes executing from %APPDATA% or %TEMP% directories.
3. Inspect and remove startup values under HKCU\Software\Microsoft\Windows\CurrentVersion\Run.
4. Block outbound C2 IP addresses and domains at the enterprise firewall and DNS resolvers.
5. Perform a complete endpoint security scan to identify and neutralize secondary payloads dropped by Pliskal.

What to Avoid

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

1. Do not allow the infected system to maintain outbound internet access while investigating.
2. Do not assume removing the initial dropper executable cleans the machine, as secondary payloads may have been installed.

References & External Analysis

• Microsoft Defender Threat Intelligence - Pliskal
• Trend Micro Threat Encyclopedia - Trojan.Win32.Pliskal
• Malwarebytes Threat Intelligence Database
• Search "pliskal" on VirusTotal (External Analysis)
• Search "pliskal" on Any.Run (Sandbox Sandbox)
• Search "pliskal" on MalwareBazaar (Malware Samples)

Frequently Asked Questions

Related Threats (Category: Trojan)

Explore other documented threats in the same operational category:

• Separ
• Y3K_Rat
• Jaik
• Imminent
• Erazer
• Moleboxvs
• Sinique
• Cardtool

Machine-readable

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