MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA2564a0592ca6e96113b5d1d2a69fea0d9768b60ec05248c13f6db304cb9c5033d87
MD54c7e61715370a88de2344fb1b383963a
File Typejs
Size1498.6 KB
First Seen2026-03-12
File Name4c7e61715370a88de2344fb1b383963a.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: 4a0592ca6e96113b5d1d2a69fea0d9768b60ec05248c13f6db304cb9c5033d87
  • MD5: 4c7e61715370a88de2344fb1b383963a

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: 4a0592ca6e96113b"
        threat_level = "medium"
        first_seen = "2026-03-12"
    condition:
        hash.sha256(0, filesize) == "4a0592ca6e96113b5d1d2a69fea0d9768b60ec05248c13f6db304cb9c5033d87"
}

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 4a0592ca6e96113b5d1d2a69fea0d9768b60ec05248c13f6db304cb9c5033d87 # MD5 4c7e61715370a88de2344fb1b383963a
TypeValueNote
sha256 4a0592ca6e96113b5d1d2a69fea0d9768b60ec05248c13f6db304cb9c5033d87 Sample:MassLogger
md5 4c7e61715370a88de2344fb1b383963a Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi