MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA256bb39bbb7f1300c10ca7fbed5c67ee95686be7a34dd99ce4ca36fc9300439d6e3
MD57a5b9ba33788d320e2e2a9fdae43f18d
File Typejs
Size3793.0 KB
First Seen2026-06-22
File NameTRANSFERENCIA.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: bb39bbb7f1300c10ca7fbed5c67ee95686be7a34dd99ce4ca36fc9300439d6e3
  • MD5: 7a5b9ba33788d320e2e2a9fdae43f18d

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: bb39bbb7f1300c10"
        threat_level = "medium"
        first_seen = "2026-06-22"
    condition:
        hash.sha256(0, filesize) == "bb39bbb7f1300c10ca7fbed5c67ee95686be7a34dd99ce4ca36fc9300439d6e3"
}

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 bb39bbb7f1300c10ca7fbed5c67ee95686be7a34dd99ce4ca36fc9300439d6e3 # MD5 7a5b9ba33788d320e2e2a9fdae43f18d
TypeValueNote
sha256 bb39bbb7f1300c10ca7fbed5c67ee95686be7a34dd99ce4ca36fc9300439d6e3 Sample:MassLogger
md5 7a5b9ba33788d320e2e2a9fdae43f18d Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi