MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA256fb8a28149cfb7b73aba293a376165db94c3c2b4bffe59965997cc8978ae15686
MD505f37e62c283c4c4296a6146720576f6
File Typejs
Size785.7 KB
First Seen2026-06-10
File NameCotización_pdf.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: fb8a28149cfb7b73aba293a376165db94c3c2b4bffe59965997cc8978ae15686
  • MD5: 05f37e62c283c4c4296a6146720576f6

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: fb8a28149cfb7b73"
        threat_level = "medium"
        first_seen = "2026-06-10"
    condition:
        hash.sha256(0, filesize) == "fb8a28149cfb7b73aba293a376165db94c3c2b4bffe59965997cc8978ae15686"
}

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 fb8a28149cfb7b73aba293a376165db94c3c2b4bffe59965997cc8978ae15686 # MD5 05f37e62c283c4c4296a6146720576f6
TypeValueNote
sha256 fb8a28149cfb7b73aba293a376165db94c3c2b4bffe59965997cc8978ae15686 Sample:MassLogger
md5 05f37e62c283c4c4296a6146720576f6 Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi