MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA25658a5531bd59d978ac4da691ff92bc8e321a5e58200f66c10046b2e7c2edd07f4
MD5db54863d3532e2cb497a8983e07af9c5
File Typeexe
Size917.5 KB
First Seen2026-05-08
File Name58a5531bd59d978ac4da691ff92bc8e321a5e58200f66c10046b2e7c2edd07f4
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: 58a5531bd59d978ac4da691ff92bc8e321a5e58200f66c10046b2e7c2edd07f4
  • MD5: db54863d3532e2cb497a8983e07af9c5

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: 58a5531bd59d978a"
        threat_level = "medium"
        first_seen = "2026-05-08"
    condition:
        hash.sha256(0, filesize) == "58a5531bd59d978ac4da691ff92bc8e321a5e58200f66c10046b2e7c2edd07f4"
}

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 58a5531bd59d978ac4da691ff92bc8e321a5e58200f66c10046b2e7c2edd07f4 # MD5 db54863d3532e2cb497a8983e07af9c5
TypeValueNote
sha256 58a5531bd59d978ac4da691ff92bc8e321a5e58200f66c10046b2e7c2edd07f4 Sample:MassLogger
md5 db54863d3532e2cb497a8983e07af9c5 Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi