MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA2566fbe5f3b1d94c0f1d75b94eefb0f50d8dcaa6579b97b426ff0500a55dba79cf0
MD56165f921c420274c1c11e4bd4e8b357f
File Typeexe
Size1021.5 KB
First Seen2025-12-17
File Namedwn.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: 6fbe5f3b1d94c0f1d75b94eefb0f50d8dcaa6579b97b426ff0500a55dba79cf0
  • MD5: 6165f921c420274c1c11e4bd4e8b357f

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: 6fbe5f3b1d94c0f1"
        threat_level = "medium"
        first_seen = "2025-12-17"
    condition:
        hash.sha256(0, filesize) == "6fbe5f3b1d94c0f1d75b94eefb0f50d8dcaa6579b97b426ff0500a55dba79cf0"
}

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 6fbe5f3b1d94c0f1d75b94eefb0f50d8dcaa6579b97b426ff0500a55dba79cf0 # MD5 6165f921c420274c1c11e4bd4e8b357f
TypeValueNote
sha256 6fbe5f3b1d94c0f1d75b94eefb0f50d8dcaa6579b97b426ff0500a55dba79cf0 Sample:MassLogger
md5 6165f921c420274c1c11e4bd4e8b357f Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi