MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA25699e5d5d8e7e04fa65d12f184c7dc0c5ceb012125e00d99eb5c10fad33f3c87ff
MD5552af3fc83e7c4032e517d5dc1345555
File Typeexe
Size777.5 KB
First Seen2026-05-21
File Name#Swift_Copy.bat.exe
Tagsexe, MassLogger

Malware Family: MassLogger

MassLogger, email tabanlı keylogger'dır.

TypeInfostealer
Programming LanguageC#/.NET
Target PlatformWindows
C2 ProtocolSMTP/FTP
PurposeEmail keylogger
First Seen Year2020

Threat Indicators (IOC)

  • SHA256: 99e5d5d8e7e04fa65d12f184c7dc0c5ceb012125e00d99eb5c10fad33f3c87ff
  • MD5: 552af3fc83e7c4032e517d5dc1345555

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: 99e5d5d8e7e04fa6"
        threat_level = "medium"
        first_seen = "2026-05-21"
    condition:
        hash.sha256(0, filesize) == "99e5d5d8e7e04fa65d12f184c7dc0c5ceb012125e00d99eb5c10fad33f3c87ff"
}

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 99e5d5d8e7e04fa65d12f184c7dc0c5ceb012125e00d99eb5c10fad33f3c87ff # MD5 552af3fc83e7c4032e517d5dc1345555
TypeValueNote
sha256 99e5d5d8e7e04fa65d12f184c7dc0c5ceb012125e00d99eb5c10fad33f3c87ff Sample:MassLogger
md5 552af3fc83e7c4032e517d5dc1345555 Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi