MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA2569c62a1531f3662bc3e36516d18e3ad4acb6d489da2f47731a3c3be9a68d84819
MD5da877ba9ffaa296f08983e1993d7d82e
File Typexlsx
Size2207.2 KB
First Seen2025-08-27
File NameINVOICE NUMBER 20250686.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: 9c62a1531f3662bc3e36516d18e3ad4acb6d489da2f47731a3c3be9a68d84819
  • MD5: da877ba9ffaa296f08983e1993d7d82e

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: 9c62a1531f3662bc"
        threat_level = "medium"
        first_seen = "2025-08-27"
    condition:
        hash.sha256(0, filesize) == "9c62a1531f3662bc3e36516d18e3ad4acb6d489da2f47731a3c3be9a68d84819"
}

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 9c62a1531f3662bc3e36516d18e3ad4acb6d489da2f47731a3c3be9a68d84819 # MD5 da877ba9ffaa296f08983e1993d7d82e
TypeValueNote
sha256 9c62a1531f3662bc3e36516d18e3ad4acb6d489da2f47731a3c3be9a68d84819 Sample:MassLogger
md5 da877ba9ffaa296f08983e1993d7d82e Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi