MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA2563c6a2a2899115e1071360a6f8a282e0e1c6dac8be6ba66b72b92fae857a08bfd
MD55396b1afb5dbdcb82b31725509a1c655
File Typejs
Size237.3 KB
First Seen2025-09-09
File Nameнарачкапроформа фактура pdf.js
Tagsjs, MassLogger, MKD

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: 3c6a2a2899115e1071360a6f8a282e0e1c6dac8be6ba66b72b92fae857a08bfd
  • MD5: 5396b1afb5dbdcb82b31725509a1c655

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: 3c6a2a2899115e10"
        threat_level = "medium"
        first_seen = "2025-09-09"
    condition:
        hash.sha256(0, filesize) == "3c6a2a2899115e1071360a6f8a282e0e1c6dac8be6ba66b72b92fae857a08bfd"
}

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 3c6a2a2899115e1071360a6f8a282e0e1c6dac8be6ba66b72b92fae857a08bfd # MD5 5396b1afb5dbdcb82b31725509a1c655
TypeValueNote
sha256 3c6a2a2899115e1071360a6f8a282e0e1c6dac8be6ba66b72b92fae857a08bfd Sample:MassLogger
md5 5396b1afb5dbdcb82b31725509a1c655 Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi