MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA2565240a9ff514c4c31fa548a21ef76f684efb7b62edb0b2db9cc5fbaa00e73b87b
MD564f950175ed6c68e51c34db1c2dab3ee
File Typeexe
Size515.5 KB
First Seen2025-09-05
File Name5240a9ff514c4c31fa548a21ef76f684efb7b62edb0b2db9cc5fbaa00e73b87b
Tagsexe, 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: 5240a9ff514c4c31fa548a21ef76f684efb7b62edb0b2db9cc5fbaa00e73b87b
  • MD5: 64f950175ed6c68e51c34db1c2dab3ee

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: 5240a9ff514c4c31"
        threat_level = "medium"
        first_seen = "2025-09-05"
    condition:
        hash.sha256(0, filesize) == "5240a9ff514c4c31fa548a21ef76f684efb7b62edb0b2db9cc5fbaa00e73b87b"
}

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 5240a9ff514c4c31fa548a21ef76f684efb7b62edb0b2db9cc5fbaa00e73b87b # MD5 64f950175ed6c68e51c34db1c2dab3ee
TypeValueNote
sha256 5240a9ff514c4c31fa548a21ef76f684efb7b62edb0b2db9cc5fbaa00e73b87b Sample:MassLogger
md5 64f950175ed6c68e51c34db1c2dab3ee Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi