MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA2563ff5da6d0c190d3f0ea7302c6890fa56fc67f77e1db223429d0c0545e7a0cb10
MD5b95f2ec723e13ccd0eb26c7306cb1c8d
File Typeexe
Size786.5 KB
First Seen2026-05-20
File NameSATIN_ALMA_SİPARİŞİ-SUMITOMO_RUBBER_AKO_LASTIK_SAN_ve_TIC_AS_docx.exe
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: 3ff5da6d0c190d3f0ea7302c6890fa56fc67f77e1db223429d0c0545e7a0cb10
  • MD5: b95f2ec723e13ccd0eb26c7306cb1c8d

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: 3ff5da6d0c190d3f"
        threat_level = "medium"
        first_seen = "2026-05-20"
    condition:
        hash.sha256(0, filesize) == "3ff5da6d0c190d3f0ea7302c6890fa56fc67f77e1db223429d0c0545e7a0cb10"
}

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 3ff5da6d0c190d3f0ea7302c6890fa56fc67f77e1db223429d0c0545e7a0cb10 # MD5 b95f2ec723e13ccd0eb26c7306cb1c8d
TypeValueNote
sha256 3ff5da6d0c190d3f0ea7302c6890fa56fc67f77e1db223429d0c0545e7a0cb10 Sample:MassLogger
md5 b95f2ec723e13ccd0eb26c7306cb1c8d Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi