MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA256fb770010cb2086154ed38fa9012d6f162c72cda1283243e7ed9dcc716a990317
MD5e53d6ca997129e49e5c8d5510dc5cc0d
File Typejs
Size136.5 KB
First Seen2025-12-08
File NameFİYAT LİSTESİ VE TEKLİF İSTEĞİ - TÜBİTAK-SAGE PDF.js
Tagsjs, MassLogger

Malware Family: MassLogger

MassLogger, email keylogger'dır.

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

Threat Indicators (IOC)

  • SHA256: fb770010cb2086154ed38fa9012d6f162c72cda1283243e7ed9dcc716a990317
  • MD5: e53d6ca997129e49e5c8d5510dc5cc0d

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: fb770010cb208615"
        threat_level = "medium"
        first_seen = "2025-12-08"
    condition:
        hash.sha256(0, filesize) == "fb770010cb2086154ed38fa9012d6f162c72cda1283243e7ed9dcc716a990317"
}

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 fb770010cb2086154ed38fa9012d6f162c72cda1283243e7ed9dcc716a990317 # MD5 e53d6ca997129e49e5c8d5510dc5cc0d
TypeValueNote
sha256 fb770010cb2086154ed38fa9012d6f162c72cda1283243e7ed9dcc716a990317 Sample:MassLogger
md5 e53d6ca997129e49e5c8d5510dc5cc0d Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi