MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA256939715d5dc9fbbb48d7ab2cc5f8bf8b092ee71a0418b112cae6f6b5b9e3b892d
MD5fd83d7d744d24e3a4e2e56698d145a19
File Typexlsx
Size2345.6 KB
First Seen2025-09-08
File NamePO_ZAGO S.r.l._23678893234_August-Payment.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: 939715d5dc9fbbb48d7ab2cc5f8bf8b092ee71a0418b112cae6f6b5b9e3b892d
  • MD5: fd83d7d744d24e3a4e2e56698d145a19

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: 939715d5dc9fbbb4"
        threat_level = "medium"
        first_seen = "2025-09-08"
    condition:
        hash.sha256(0, filesize) == "939715d5dc9fbbb48d7ab2cc5f8bf8b092ee71a0418b112cae6f6b5b9e3b892d"
}

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 939715d5dc9fbbb48d7ab2cc5f8bf8b092ee71a0418b112cae6f6b5b9e3b892d # MD5 fd83d7d744d24e3a4e2e56698d145a19
TypeValueNote
sha256 939715d5dc9fbbb48d7ab2cc5f8bf8b092ee71a0418b112cae6f6b5b9e3b892d Sample:MassLogger
md5 fd83d7d744d24e3a4e2e56698d145a19 Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi