MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA256190a48b33f8fa0a2e41094c6736bc12cfa6a56c03d5f770a35afbcbfdf5cbbd8
MD5093fb0ca0c0771d36d583f1c07895e67
File Typezip
Size519.3 KB
First Seen2026-05-21
File NameFCM3903.zip
TagsMassLogger, zip

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: 190a48b33f8fa0a2e41094c6736bc12cfa6a56c03d5f770a35afbcbfdf5cbbd8
  • MD5: 093fb0ca0c0771d36d583f1c07895e67

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: 190a48b33f8fa0a2"
        threat_level = "medium"
        first_seen = "2026-05-21"
    condition:
        hash.sha256(0, filesize) == "190a48b33f8fa0a2e41094c6736bc12cfa6a56c03d5f770a35afbcbfdf5cbbd8"
}

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 190a48b33f8fa0a2e41094c6736bc12cfa6a56c03d5f770a35afbcbfdf5cbbd8 # MD5 093fb0ca0c0771d36d583f1c07895e67
TypeValueNote
sha256 190a48b33f8fa0a2e41094c6736bc12cfa6a56c03d5f770a35afbcbfdf5cbbd8 Sample:MassLogger
md5 093fb0ca0c0771d36d583f1c07895e67 Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi