MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA2569417f2925371ccf6a79d8f5b66cae6c6103687118844ebdc8bf365a1724f0765
MD50239eb54aef99821e4c4f861e7ec6568
File Typejs
Size1556.4 KB
First Seen2026-04-23
File NameMT103-4893-ERROR.js
Tagsexe-in-archive, js, MassLogger, spamtrap

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: 9417f2925371ccf6a79d8f5b66cae6c6103687118844ebdc8bf365a1724f0765
  • MD5: 0239eb54aef99821e4c4f861e7ec6568

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: 9417f2925371ccf6"
        threat_level = "medium"
        first_seen = "2026-04-23"
    condition:
        hash.sha256(0, filesize) == "9417f2925371ccf6a79d8f5b66cae6c6103687118844ebdc8bf365a1724f0765"
}

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 9417f2925371ccf6a79d8f5b66cae6c6103687118844ebdc8bf365a1724f0765 # MD5 0239eb54aef99821e4c4f861e7ec6568
TypeValueNote
sha256 9417f2925371ccf6a79d8f5b66cae6c6103687118844ebdc8bf365a1724f0765 Sample:MassLogger
md5 0239eb54aef99821e4c4f861e7ec6568 Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi