MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA256521ac3a0cea03af13bf5a6fb557255ac514d69e91bb23359422e362da95272fe
MD5b3c2fcd5300c497e4565126a3dbc871a
File Typexlsx
Size2233.8 KB
First Seen2025-08-25
File NameContact Form.xlam
TagsCVE-2017-11882, MassLogger, xlam, xlsx

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: 521ac3a0cea03af13bf5a6fb557255ac514d69e91bb23359422e362da95272fe
  • MD5: b3c2fcd5300c497e4565126a3dbc871a

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: 521ac3a0cea03af1"
        threat_level = "medium"
        first_seen = "2025-08-25"
    condition:
        hash.sha256(0, filesize) == "521ac3a0cea03af13bf5a6fb557255ac514d69e91bb23359422e362da95272fe"
}

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 521ac3a0cea03af13bf5a6fb557255ac514d69e91bb23359422e362da95272fe # MD5 b3c2fcd5300c497e4565126a3dbc871a
TypeValueNote
sha256 521ac3a0cea03af13bf5a6fb557255ac514d69e91bb23359422e362da95272fe Sample:MassLogger
md5 b3c2fcd5300c497e4565126a3dbc871a Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi