{
  "family": "oficla",
  "sample_count": 2,
  "category": "trojan",
  "description": "Trojan:Win32/Oficla (also widely known as Sasfis) is a historically massive botnet and trojan downloader that peaked in activity between 2010 and 2012. Its primary function was to compromise endpoints and turn them into 'zombies' within the Oficla botnet. These zombies were then rented out to other cybercriminals to silently download and execute secondary payloads (`T1105`), most notoriously Fake Antivirus (Rogue software), spam bots (like Rustock), and banking trojans (like Zeus).<br><br><b>Understanding Oficla (Sasfis Botnet Operations)</b><br>To an end-user, an Oficla infection was usually silent, noticeable only when the secondary payload (like a screaming Fake AV pop-up) executed. For a security operations center (SOC), Oficla represents a critical breach. If Oficla is detected, the system must be considered fully compromised by multiple, unknown threat actors, as the botnet operators frequently sold access to the same machine to multiple buyers.<br><br><b>Execution and C2 Mechanics</b><br>Oficla was primarily distributed via massive spam campaigns (`T1566.001`), often disguised as fake delivery invoices (FedEx, UPS) containing malicious executables inside ZIP files, or via exploit kits on compromised websites. Upon execution, it injects its code into `explorer.exe` or `svchost.exe` (`T1055`) to hide its activity and establishes persistence via the Registry Run keys. It communicates with its C2 servers using HTTP POST requests, often employing a fast-flux DNS network to hide the true location of the servers. The C2 server responds with encrypted URLs pointing to the secondary payloads the bot must download and execute.<br><br><b>Indicators of Compromise & Impact</b><br>The primary impact is the deployment of severe secondary malware and incorporation into a criminal botnet. Host-based IoCs include EDR alerts for process injection (particularly into `explorer.exe`) and the rapid, silent downloading and execution of unknown binaries into the `%Temp%` directory. Network IoCs include a distinctive 'beaconing' pattern of HTTP POST requests containing encrypted system profiling data sent to rapidly changing, algorithmically generated domains (DGAs).",
  "cta": "Published by the SystemHelpdesk team.",
  "aliases": [],
  "enrichment_level": "expert-seo",
  "faq": [
    {
      "@type": "Question",
      "name": "What is Oficla and what threat category does it belong to?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Oficla is classified as a Trojan. Documented across security telemetry, it is engineered to execute unauthorized operations, establish persistent footholds on target endpoints, and facilitate malicious campaigns targeting enterprise and individual environments."
      }
    },
    {
      "@type": "Question",
      "name": "How does Oficla establish persistence and evade defensive controls?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Oficla typically establishes persistence through registry run keys, scheduled tasks, or service installations, while evading signature-based antivirus solutions through code obfuscation, memory injection, or anti-analysis sandbox checks."
      }
    },
    {
      "@type": "Question",
      "name": "What are the essential incident response steps for mitigating a Oficla compromise?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Security teams responding to Oficla should immediately isolate affected endpoints from the network, perform memory triage to capture volatile forensic artifacts, audit registry and startup persistence mechanisms, revoke exposed user credentials, and restore systems from verified, clean backups."
      }
    },
    {
      "@type": "Question",
      "name": "What secondary payloads and staging behaviors are commonly associated with Oficla?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Oficla frequently operates as a loader or dropper designed to establish a foothold before downloading and executing secondary high-impact malware payloads. Depending on the threat actor's objectives, these dropped modules can range from ransomware and banking injects to modular infostealers and remote management backdoors."
      }
    },
    {
      "@type": "Question",
      "name": "How can security operations teams effectively detect and hunt for Oficla across enterprise endpoints?",
      "acceptedAnswer": {
        "@type": "Answer",
        "text": "Defenders should hunt for Oficla by deploying behavioral endpoint detection and response (EDR) rules that monitor suspicious process spawning (such as cmd.exe or powershell.exe spawned from office documents or temporary directories), anomalous outbound network connections from non-browser binaries, and unauthorized modifications to Windows Run keys and scheduled task registries."
      }
    }
  ],
  "faq_count": 5,
  "mitre_attack": [
    "T1547.001",
    "T1105",
    "T1566.001",
    "T1055"
  ],
  "cisa_advisory": null,
  "last_updated": "2026-06-09",
  "mitre_attack_detail": [
    {
      "id": "T1105",
      "name": "Ingress Tool Transfer (The primary function: downloading other malware)",
      "tactic": "Command and Control"
    },
    {
      "id": "T1055",
      "name": "Process Injection (Hiding within explorer.exe or svchost.exe)",
      "tactic": "Defense Evasion"
    },
    {
      "id": "T1566.001",
      "name": "Phishing: Spearphishing Attachment (Primary distribution method)",
      "tactic": "Initial Access"
    },
    {
      "id": "T1547.001",
      "name": "Boot or Logon Autostart Execution: Registry Run Keys / Startup Folder",
      "tactic": "Persistence"
    }
  ],
  "containment_steps": [
    "Immediately isolate the compromised endpoint from the network to sever its connection to the Oficla C2 infrastructure.",
    "Assume the system is heavily compromised by multiple malware families; initiate a full reimaging of the machine rather than attempting cleanup.",
    "Analyze DNS and proxy logs to identify the C2 domains Oficla contacted and block them enterprise-wide to prevent further botnet registration.",
    "Implement email filtering rules to block executable attachments (e.g., `.exe`, `.scr` inside `.zip` files) commonly used to distribute the malware."
  ],
  "what_to_avoid": [
    "Do not assume the incident is resolved by merely deleting the initial Oficla executable; it is guaranteed that secondary payloads were downloaded.",
    "Avoid trusting the integrity of the operating system after an Oficla infection; full wipe and reinstall is the only safe remediation."
  ],
  "target_industries": [
    "Global / Opportunistic"
  ],
  "motivation": "Opportunistic",
  "threat_actors": [
    "Unknown / Cybercriminal"
  ],
  "target_geographies": [
    "Global"
  ],
  "attack_stage": [
    "execution",
    "persistence"
  ],
  "ecosystem": [
    "windows_pe"
  ],
  "is_emerging": false,
  "target_platforms": [
    "Windows 11",
    "Windows 10",
    "Windows 7"
  ]
}