MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA256e378354b49d513292c0c6cb4b733dd5b3bf64fd4d706830b0fb1ab2a158a6b86
MD5a9b5389e1a4506246ebcd630c0a4c508
File Typejs
Size3785.2 KB
First Seen2026-06-04
File NameScan Copy_784898937637B23.JS
Tagsexe, js, 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: e378354b49d513292c0c6cb4b733dd5b3bf64fd4d706830b0fb1ab2a158a6b86
  • MD5: a9b5389e1a4506246ebcd630c0a4c508

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: e378354b49d51329"
        threat_level = "medium"
        first_seen = "2026-06-04"
    condition:
        hash.sha256(0, filesize) == "e378354b49d513292c0c6cb4b733dd5b3bf64fd4d706830b0fb1ab2a158a6b86"
}

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 e378354b49d513292c0c6cb4b733dd5b3bf64fd4d706830b0fb1ab2a158a6b86 # MD5 a9b5389e1a4506246ebcd630c0a4c508
TypeValueNote
sha256 e378354b49d513292c0c6cb4b733dd5b3bf64fd4d706830b0fb1ab2a158a6b86 Sample:MassLogger
md5 a9b5389e1a4506246ebcd630c0a4c508 Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi