MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA2563123b76afbfe94cc8b3bb1b4e7f0ec1dc3edec8ff7d35ee4310c1a6f951bcb88
MD55d2de3dd6181fe2bf99cdf22da215040
File Typejs
Size4896.0 KB
First Seen2026-05-20
File NamePO-O01388217655784238-PDF.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: 3123b76afbfe94cc8b3bb1b4e7f0ec1dc3edec8ff7d35ee4310c1a6f951bcb88
  • MD5: 5d2de3dd6181fe2bf99cdf22da215040

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: 3123b76afbfe94cc"
        threat_level = "medium"
        first_seen = "2026-05-20"
    condition:
        hash.sha256(0, filesize) == "3123b76afbfe94cc8b3bb1b4e7f0ec1dc3edec8ff7d35ee4310c1a6f951bcb88"
}

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 3123b76afbfe94cc8b3bb1b4e7f0ec1dc3edec8ff7d35ee4310c1a6f951bcb88 # MD5 5d2de3dd6181fe2bf99cdf22da215040
TypeValueNote
sha256 3123b76afbfe94cc8b3bb1b4e7f0ec1dc3edec8ff7d35ee4310c1a6f951bcb88 Sample:MassLogger
md5 5d2de3dd6181fe2bf99cdf22da215040 Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi