MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA2567e99f5e3d4efc4aece3e91b7cbbbcf2ffcb21072a8f14bd874047383e77fe5ab
MD5c409efde87d14f7a02f67742df2b28c6
File Typejs
Size3335.1 KB
First Seen2026-05-27
File NameApril Offer-SSQ2026.4953.JS
Tagsexe-in-archive, js, MassLogger, spamtrap

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: 7e99f5e3d4efc4aece3e91b7cbbbcf2ffcb21072a8f14bd874047383e77fe5ab
  • MD5: c409efde87d14f7a02f67742df2b28c6

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: 7e99f5e3d4efc4ae"
        threat_level = "medium"
        first_seen = "2026-05-27"
    condition:
        hash.sha256(0, filesize) == "7e99f5e3d4efc4aece3e91b7cbbbcf2ffcb21072a8f14bd874047383e77fe5ab"
}

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 7e99f5e3d4efc4aece3e91b7cbbbcf2ffcb21072a8f14bd874047383e77fe5ab # MD5 c409efde87d14f7a02f67742df2b28c6
TypeValueNote
sha256 7e99f5e3d4efc4aece3e91b7cbbbcf2ffcb21072a8f14bd874047383e77fe5ab Sample:MassLogger
md5 c409efde87d14f7a02f67742df2b28c6 Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi