MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA256db27519748a4ad7c5b19021ff6d05ebb6b9fc66b9c8b236a5d1ffe17f97902a6
MD536a0d42f12d6c262cd3ce83e7781c689
File Typejs
Size169.6 KB
First Seen2025-12-02
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: db27519748a4ad7c5b19021ff6d05ebb6b9fc66b9c8b236a5d1ffe17f97902a6
  • MD5: 36a0d42f12d6c262cd3ce83e7781c689

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: db27519748a4ad7c"
        threat_level = "medium"
        first_seen = "2025-12-02"
    condition:
        hash.sha256(0, filesize) == "db27519748a4ad7c5b19021ff6d05ebb6b9fc66b9c8b236a5d1ffe17f97902a6"
}

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 db27519748a4ad7c5b19021ff6d05ebb6b9fc66b9c8b236a5d1ffe17f97902a6 # MD5 36a0d42f12d6c262cd3ce83e7781c689
TypeValueNote
sha256 db27519748a4ad7c5b19021ff6d05ebb6b9fc66b9c8b236a5d1ffe17f97902a6 Sample:MassLogger
md5 36a0d42f12d6c262cd3ce83e7781c689 Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi