MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA256998b32d1f8beceb7c8ad68f8888061b9c36e16c8181a42bdbdfe911dbed7e5f7
MD5c3a203791d5a3e4523729265917322ea
File Typerar
Size683.1 KB
First Seen2026-05-20
File NameTEKLİF_İSTEĞİ_-_TUSAŞ_TÜRK_HAVACILIK_UZAY_SANAYİİ_xlsx.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: 998b32d1f8beceb7c8ad68f8888061b9c36e16c8181a42bdbdfe911dbed7e5f7
  • MD5: c3a203791d5a3e4523729265917322ea

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: 998b32d1f8beceb7"
        threat_level = "medium"
        first_seen = "2026-05-20"
    condition:
        hash.sha256(0, filesize) == "998b32d1f8beceb7c8ad68f8888061b9c36e16c8181a42bdbdfe911dbed7e5f7"
}

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 998b32d1f8beceb7c8ad68f8888061b9c36e16c8181a42bdbdfe911dbed7e5f7 # MD5 c3a203791d5a3e4523729265917322ea
TypeValueNote
sha256 998b32d1f8beceb7c8ad68f8888061b9c36e16c8181a42bdbdfe911dbed7e5f7 Sample:MassLogger
md5 c3a203791d5a3e4523729265917322ea Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi