MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA256b5bdec1d0ff3986b18258fb979256487aaa706197d45a6f9d3603660136203de
MD5f2c5baf5a66539657437b60bcb8d800d
File Typez
Size648.0 KB
First Seen2026-05-21
File NameTeklif_PDF.z
TagsMassLogger, z

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: b5bdec1d0ff3986b18258fb979256487aaa706197d45a6f9d3603660136203de
  • MD5: f2c5baf5a66539657437b60bcb8d800d

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: b5bdec1d0ff3986b"
        threat_level = "medium"
        first_seen = "2026-05-21"
    condition:
        hash.sha256(0, filesize) == "b5bdec1d0ff3986b18258fb979256487aaa706197d45a6f9d3603660136203de"
}

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 b5bdec1d0ff3986b18258fb979256487aaa706197d45a6f9d3603660136203de # MD5 f2c5baf5a66539657437b60bcb8d800d
TypeValueNote
sha256 b5bdec1d0ff3986b18258fb979256487aaa706197d45a6f9d3603660136203de Sample:MassLogger
md5 f2c5baf5a66539657437b60bcb8d800d Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi