MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA256b375fec6811bd6a37e2ae22385aeda392a4e2d3111b05efc36775bdd3052b0fe
MD5b182a6f6b287b7170aa163dafd297cf8
File Typerar
Size88.0 KB
First Seen2026-05-20
File NameMT103.rar
TagsMassLogger, rar

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: b375fec6811bd6a37e2ae22385aeda392a4e2d3111b05efc36775bdd3052b0fe
  • MD5: b182a6f6b287b7170aa163dafd297cf8

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: b375fec6811bd6a3"
        threat_level = "medium"
        first_seen = "2026-05-20"
    condition:
        hash.sha256(0, filesize) == "b375fec6811bd6a37e2ae22385aeda392a4e2d3111b05efc36775bdd3052b0fe"
}

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 b375fec6811bd6a37e2ae22385aeda392a4e2d3111b05efc36775bdd3052b0fe # MD5 b182a6f6b287b7170aa163dafd297cf8
TypeValueNote
sha256 b375fec6811bd6a37e2ae22385aeda392a4e2d3111b05efc36775bdd3052b0fe Sample:MassLogger
md5 b182a6f6b287b7170aa163dafd297cf8 Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi