FormBook | Threat Level: high | Type: Infostealer

Cryptographic Identifiers

SHA2566a8ebbebe9893aef36b8f89ba5305b016d55cb4970a8707b068e0a3ea50cf7e2
MD5affb2340788b0a64915e781e2801d089
File Typejs
Size9492.5 KB
First Seen2026-05-11
File Name6a8ebbebe9893aef36b8f89ba5305b016d55cb4970a8707b068e0a3ea50cf7e2.js
TagsFormBook, js, Orio-Xrio

Malware Family: FormBook

FormBook, MaaS stealer'dır.

TypeInfostealer
Programming LanguageC
Target PlatformWindows
C2 ProtocolHTTP
PurposeForm verisi hırsızlığı
First Seen Year2016
AliasesxLoader

Threat Indicators (IOC)

  • SHA256: 6a8ebbebe9893aef36b8f89ba5305b016d55cb4970a8707b068e0a3ea50cf7e2
  • MD5: affb2340788b0a64915e781e2801d089

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 FormBook_SHA256 {
    meta:
        description = "FormBook sample: 6a8ebbebe9893aef"
        threat_level = "high"
        first_seen = "2026-05-11"
    condition:
        hash.sha256(0, filesize) == "6a8ebbebe9893aef36b8f89ba5305b016d55cb4970a8707b068e0a3ea50cf7e2"
}

FormBook — Malware Profile

FormBook web form verisi ve credential hırsızı. SmartAssembly paketleyici. İspanyolca LATAM elektrik faturası lür.

Malware Type
Infostealer
Programming Language
C
C2 Protocol
HTTP
Target Systems
Windows
Also Known As (AKA)
xLoader

Technical Details

C dili, Windows API hooking (form grabbing), HTTP POST C2, browser form stealer, keylogger, screenshot, clipboard monitor, process injection (process hollowing)

Attribution / Threat Actor

ABD'de gelistirilmis; satis darknet forumlari uzerinden yapilmis. Dunya genelindeki multuple suc gruplarina hizmet veren MaaS platformu.

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 — FormBook
# SHA256 6a8ebbebe9893aef36b8f89ba5305b016d55cb4970a8707b068e0a3ea50cf7e2 # MD5 affb2340788b0a64915e781e2801d089
TypeValueNote
sha256 6a8ebbebe9893aef36b8f89ba5305b016d55cb4970a8707b068e0a3ea50cf7e2 Sample:FormBook
md5 affb2340788b0a64915e781e2801d089 Sample:FormBook

C2 Servers (5 recorded servers for this family)

Address Type Port Protocol Status Country
45.61.136.16 ip 80 HTTP active US
hxxp://freeupgrades.net/s1xt/ domain 80 HTTP inactive US
103.75.160.239 ip 443 HTTPS inactive HK
3.29.19.86 ip — TCP inactive —
form-book.club domain 80 HTTP sinkholed —

C2 addresses are provided only from malware samples manually verified by the KEYDAL team. Commercial use is prohibited.

Tags
formbookinfostealermalwarehighsha256hash-analizi