MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA2565fb1c4c9d36019fa85b4927e66306309e360445283a272ace5296d43c841dec7
MD58ae2aacc04e8c2cecd1a73c653d70917
File Typejs
Size4004.8 KB
First Seen2026-06-15
File Namesuccess.js
Tagsjs, 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: 5fb1c4c9d36019fa85b4927e66306309e360445283a272ace5296d43c841dec7
  • MD5: 8ae2aacc04e8c2cecd1a73c653d70917

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: 5fb1c4c9d36019fa"
        threat_level = "medium"
        first_seen = "2026-06-15"
    condition:
        hash.sha256(0, filesize) == "5fb1c4c9d36019fa85b4927e66306309e360445283a272ace5296d43c841dec7"
}

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 5fb1c4c9d36019fa85b4927e66306309e360445283a272ace5296d43c841dec7 # MD5 8ae2aacc04e8c2cecd1a73c653d70917
TypeValueNote
sha256 5fb1c4c9d36019fa85b4927e66306309e360445283a272ace5296d43c841dec7 Sample:MassLogger
md5 8ae2aacc04e8c2cecd1a73c653d70917 Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi