MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA256f03338eb6cb0e3559390a68cdb7d942d52eb5554b2b9065cf72efae2ebd51c57
MD553083f704b6227c4e46d336c25fda750
File Typeiso
Size838.0 KB
First Seen2026-05-21
File Name#Swift_Copy.iso
Tagsiso, MassLogger

Malware Family: MassLogger

MassLogger, email tabanlı keylogger'dır.

TypeInfostealer
Programming LanguageC#/.NET
Target PlatformWindows
C2 ProtocolSMTP/FTP
PurposeEmail keylogger
First Seen Year2020

Threat Indicators (IOC)

  • SHA256: f03338eb6cb0e3559390a68cdb7d942d52eb5554b2b9065cf72efae2ebd51c57
  • MD5: 53083f704b6227c4e46d336c25fda750

You can verify all hash values of this sample on VirusTotal.

System Cleanup Guide

  1. Disconnect the system from the network immediately
  2. Yeni bir cihazdan banka hesabı, sosyal medya ve e-posta şifrelerini değiştirin
  3. Move crypto wallets to a new address and abandon the old ones
  4. Start a full scan with up-to-date antivirus
  5. Clear saved browser passwords and enable 2FA
  6. Sign out of all sessions on every affected service

YARA Rule Hints

rule MassLogger_SHA256 {
    meta:
        description = "MassLogger sample: f03338eb6cb0e355"
        threat_level = "medium"
        first_seen = "2026-05-21"
    condition:
        hash.sha256(0, filesize) == "f03338eb6cb0e3559390a68cdb7d942d52eb5554b2b9065cf72efae2ebd51c57"
}

MassLogger — Malware Profile

MassLogger credential stealer. PT2600000043.js Portekiz fatura lurü. CommonJS obfuscation. dispatch configuration data.

Malware Type
Infostealer
Programming Language
C#/.NET
C2 Protocol
SMTP/FTP
Target Systems
Windows

Capabilities & Behavior

Tarayıcı Kimlik Bilgileri
Çerez Hırsızlığı
Kripto Cüzdan Çalma
Sistem Bilgisi
Ekran Görüntüsü
FTP/SSH İstemci Şifreleri
E-posta İstemcisi Çalma
Veri Sızıntısı

IOC List (2 indicators)

IOC — MassLogger
# SHA256 f03338eb6cb0e3559390a68cdb7d942d52eb5554b2b9065cf72efae2ebd51c57 # MD5 53083f704b6227c4e46d336c25fda750
TypeValueNote
sha256 f03338eb6cb0e3559390a68cdb7d942d52eb5554b2b9065cf72efae2ebd51c57 Sample:MassLogger
md5 53083f704b6227c4e46d336c25fda750 Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi