MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA25603ffd9138d53cd6d65d05e242d9775a3b51201a0d556d208a69509e7be0455b7
MD50c5fe9c5efc8518ae098948f69eaaa4a
File Typeexe
Size665.0 KB
First Seen2025-08-09
File NameSecuriteInfo.com.Win32.MalwareX-gen.39449132
Tagsexe, MassLogger

Malware Family: MassLogger

MassLogger, email keylogger'dır.

TypeInfostealer
Programming LanguageC#/.NET
Target PlatformWindows
C2 ProtocolSMTP/FTP
PurposeEmail keylogger
First Seen Year2020

Threat Indicators (IOC)

  • SHA256: 03ffd9138d53cd6d65d05e242d9775a3b51201a0d556d208a69509e7be0455b7
  • MD5: 0c5fe9c5efc8518ae098948f69eaaa4a

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: 03ffd9138d53cd6d"
        threat_level = "medium"
        first_seen = "2025-08-09"
    condition:
        hash.sha256(0, filesize) == "03ffd9138d53cd6d65d05e242d9775a3b51201a0d556d208a69509e7be0455b7"
}

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 03ffd9138d53cd6d65d05e242d9775a3b51201a0d556d208a69509e7be0455b7 # MD5 0c5fe9c5efc8518ae098948f69eaaa4a
TypeValueNote
sha256 03ffd9138d53cd6d65d05e242d9775a3b51201a0d556d208a69509e7be0455b7 Sample:MassLogger
md5 0c5fe9c5efc8518ae098948f69eaaa4a Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi