MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA256321a8d0b914a4e5a4ba9789047d53336d012043d4a06503bb275e68ea9d99664
MD5647e0f91cb6b5daee795567998dd478d
File Typerar
Size499.0 KB
First Seen2026-05-20
File NameSATIN_ALMA_SİPARİŞİ-SUMITOMO_RUBBER_AKO_LASTIK_SAN_ve_TIC_AS_docx.z.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: 321a8d0b914a4e5a4ba9789047d53336d012043d4a06503bb275e68ea9d99664
  • MD5: 647e0f91cb6b5daee795567998dd478d

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: 321a8d0b914a4e5a"
        threat_level = "medium"
        first_seen = "2026-05-20"
    condition:
        hash.sha256(0, filesize) == "321a8d0b914a4e5a4ba9789047d53336d012043d4a06503bb275e68ea9d99664"
}

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 321a8d0b914a4e5a4ba9789047d53336d012043d4a06503bb275e68ea9d99664 # MD5 647e0f91cb6b5daee795567998dd478d
TypeValueNote
sha256 321a8d0b914a4e5a4ba9789047d53336d012043d4a06503bb275e68ea9d99664 Sample:MassLogger
md5 647e0f91cb6b5daee795567998dd478d Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi