MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA2564fc5073366b476940d5c4de15c7aca7a2d2bbd32b731153a730894cc766e4c35
MD56476120282b3dc743b329d93568ea7ac
File Typevbs
Size16.5 KB
First Seen2025-10-03
File NameDoc N° 021025.vbs
TagsMassLogger, vbs

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: 4fc5073366b476940d5c4de15c7aca7a2d2bbd32b731153a730894cc766e4c35
  • MD5: 6476120282b3dc743b329d93568ea7ac

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: 4fc5073366b47694"
        threat_level = "medium"
        first_seen = "2025-10-03"
    condition:
        hash.sha256(0, filesize) == "4fc5073366b476940d5c4de15c7aca7a2d2bbd32b731153a730894cc766e4c35"
}

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 4fc5073366b476940d5c4de15c7aca7a2d2bbd32b731153a730894cc766e4c35 # MD5 6476120282b3dc743b329d93568ea7ac
TypeValueNote
sha256 4fc5073366b476940d5c4de15c7aca7a2d2bbd32b731153a730894cc766e4c35 Sample:MassLogger
md5 6476120282b3dc743b329d93568ea7ac Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi