MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA256fca4414079dd2c991fced7febaa597556a8950e94c43a787f90e0ad3176f7eea
MD5c083093efd79e5c76d04b994f326ab36
File Typejs
Size1547.4 KB
First Seen2026-04-27
File Namefile27.js
Tagsexe-in-archive, js, MassLogger, spamtrap

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: fca4414079dd2c991fced7febaa597556a8950e94c43a787f90e0ad3176f7eea
  • MD5: c083093efd79e5c76d04b994f326ab36

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: fca4414079dd2c99"
        threat_level = "medium"
        first_seen = "2026-04-27"
    condition:
        hash.sha256(0, filesize) == "fca4414079dd2c991fced7febaa597556a8950e94c43a787f90e0ad3176f7eea"
}

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 fca4414079dd2c991fced7febaa597556a8950e94c43a787f90e0ad3176f7eea # MD5 c083093efd79e5c76d04b994f326ab36
TypeValueNote
sha256 fca4414079dd2c991fced7febaa597556a8950e94c43a787f90e0ad3176f7eea Sample:MassLogger
md5 c083093efd79e5c76d04b994f326ab36 Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi