MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA25640003c0707a0d639b8e27d01ac0a31b73579d5e7a79077002f8005932b94e836
MD5062916e318db8a0660dfcf9443aa90af
File Typeexe
Size1017.8 KB
First Seen2026-04-21
File NameREB0000002400.scr
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: 40003c0707a0d639b8e27d01ac0a31b73579d5e7a79077002f8005932b94e836
  • MD5: 062916e318db8a0660dfcf9443aa90af

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: 40003c0707a0d639"
        threat_level = "medium"
        first_seen = "2026-04-21"
    condition:
        hash.sha256(0, filesize) == "40003c0707a0d639b8e27d01ac0a31b73579d5e7a79077002f8005932b94e836"
}

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 40003c0707a0d639b8e27d01ac0a31b73579d5e7a79077002f8005932b94e836 # MD5 062916e318db8a0660dfcf9443aa90af
TypeValueNote
sha256 40003c0707a0d639b8e27d01ac0a31b73579d5e7a79077002f8005932b94e836 Sample:MassLogger
md5 062916e318db8a0660dfcf9443aa90af Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi