MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA2564f91c3fc284a89566d7e8567e1cda33a03563c3484bdbd630761356d56053e41
MD5790a08b5899c25900d4e92f2976f08a4
File Typeexe
Size1014.0 KB
First Seen2025-11-06
File Name4f91c3fc284a89566d7e8567e1cda33a03563c3484bdbd630761356d56053e41
Tagsexe, MassLogger

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: 4f91c3fc284a89566d7e8567e1cda33a03563c3484bdbd630761356d56053e41
  • MD5: 790a08b5899c25900d4e92f2976f08a4

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: 4f91c3fc284a8956"
        threat_level = "medium"
        first_seen = "2025-11-06"
    condition:
        hash.sha256(0, filesize) == "4f91c3fc284a89566d7e8567e1cda33a03563c3484bdbd630761356d56053e41"
}

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 4f91c3fc284a89566d7e8567e1cda33a03563c3484bdbd630761356d56053e41 # MD5 790a08b5899c25900d4e92f2976f08a4
TypeValueNote
sha256 4f91c3fc284a89566d7e8567e1cda33a03563c3484bdbd630761356d56053e41 Sample:MassLogger
md5 790a08b5899c25900d4e92f2976f08a4 Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi