MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA256507d3c5a4df4780a22e730a08e104c2c78ec20c2323284cb98153158002f77e1
MD56f891f848dee10463dd1b24d6202292b
File Typejs
Size4587.7 KB
First Seen2025-07-29
File NameExpresion_Of_Interest_Template.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: 507d3c5a4df4780a22e730a08e104c2c78ec20c2323284cb98153158002f77e1
  • MD5: 6f891f848dee10463dd1b24d6202292b

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: 507d3c5a4df4780a"
        threat_level = "medium"
        first_seen = "2025-07-29"
    condition:
        hash.sha256(0, filesize) == "507d3c5a4df4780a22e730a08e104c2c78ec20c2323284cb98153158002f77e1"
}

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 507d3c5a4df4780a22e730a08e104c2c78ec20c2323284cb98153158002f77e1 # MD5 6f891f848dee10463dd1b24d6202292b
TypeValueNote
sha256 507d3c5a4df4780a22e730a08e104c2c78ec20c2323284cb98153158002f77e1 Sample:MassLogger
md5 6f891f848dee10463dd1b24d6202292b Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi