MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA25655c420575256efe054c9e02202fce8e4540b62e5e7bbd5fb24b25effdbdefd98
MD53ea5dc223fef0d8d959f3be548c4be64
File Typeexe
Size568.0 KB
First Seen2025-09-25
File NameBL7258264260.exe
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: 55c420575256efe054c9e02202fce8e4540b62e5e7bbd5fb24b25effdbdefd98
  • MD5: 3ea5dc223fef0d8d959f3be548c4be64

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: 55c420575256efe0"
        threat_level = "medium"
        first_seen = "2025-09-25"
    condition:
        hash.sha256(0, filesize) == "55c420575256efe054c9e02202fce8e4540b62e5e7bbd5fb24b25effdbdefd98"
}

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 55c420575256efe054c9e02202fce8e4540b62e5e7bbd5fb24b25effdbdefd98 # MD5 3ea5dc223fef0d8d959f3be548c4be64
TypeValueNote
sha256 55c420575256efe054c9e02202fce8e4540b62e5e7bbd5fb24b25effdbdefd98 Sample:MassLogger
md5 3ea5dc223fef0d8d959f3be548c4be64 Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi