MassLogger | Threat Level: medium | Type: Infostealer

Cryptographic Identifiers

SHA256acfbf44d0a08a7bc75c46ec45070f60918936d391584454a1422777206219d06
MD5cc88e339da7ddeb7958518ffc7dade21
File Typejs
Size16.4 KB
First Seen2025-09-29
File Nameracun________3098765_PDF.js
Tagsjs, MassLogger, MSI-STEGO

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: acfbf44d0a08a7bc75c46ec45070f60918936d391584454a1422777206219d06
  • MD5: cc88e339da7ddeb7958518ffc7dade21

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: acfbf44d0a08a7bc"
        threat_level = "medium"
        first_seen = "2025-09-29"
    condition:
        hash.sha256(0, filesize) == "acfbf44d0a08a7bc75c46ec45070f60918936d391584454a1422777206219d06"
}

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 acfbf44d0a08a7bc75c46ec45070f60918936d391584454a1422777206219d06 # MD5 cc88e339da7ddeb7958518ffc7dade21
TypeValueNote
sha256 acfbf44d0a08a7bc75c46ec45070f60918936d391584454a1422777206219d06 Sample:MassLogger
md5 cc88e339da7ddeb7958518ffc7dade21 Sample:MassLogger
Tags
massloggerinfostealermalwaremediumsha256hash-analizi