MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA2561555640cedebc2846d967fde69fd51539f7f0ebbc9b53b2b7e61a2cdf7628bb8
MD55bd36afeec596fea704dd84b9943291d
File Typejs
Size1077.6 KB
First Seen2026-06-05
File NameDOC98716525 - ATR520260506-Draftpacking.js
Tagsjs, 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: 1555640cedebc2846d967fde69fd51539f7f0ebbc9b53b2b7e61a2cdf7628bb8
  • MD5: 5bd36afeec596fea704dd84b9943291d

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: 1555640cedebc284"
        threat_level = "medium"
        first_seen = "2026-06-05"
    condition:
        hash.sha256(0, filesize) == "1555640cedebc2846d967fde69fd51539f7f0ebbc9b53b2b7e61a2cdf7628bb8"
}

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 1555640cedebc2846d967fde69fd51539f7f0ebbc9b53b2b7e61a2cdf7628bb8 # MD5 5bd36afeec596fea704dd84b9943291d
TypeValueNote
sha256 1555640cedebc2846d967fde69fd51539f7f0ebbc9b53b2b7e61a2cdf7628bb8 Sample:MassLogger
md5 5bd36afeec596fea704dd84b9943291d Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi