FormBook | Threat Level: high | Type: Infostealer

Cryptographic Identifiers

SHA256814e9182e488fc28c23dbe7a004846b6aa709a1cb31a11e335f5a20d2a7fd35b
MD5e5a6cf272b9d1191e74ce2c9f64064e2
File Typeexe
Size955.0 KB
First Seen2026-06-08
File Name814e9182e488fc28c23dbe7a004846b6aa709a1cb31a11e335f5a20d2a7fd35b
Tagsexe, FormBook

Malware Family: FormBook

FormBook, MaaS infostealer'dır.

TypeInfostealer
Programming LanguageC
Target PlatformWindows
C2 ProtocolHTTP
PurposeForm verisi, tuş kaydı
First Seen Year2016
AliasesxLoader

Threat Indicators (IOC)

  • SHA256: 814e9182e488fc28c23dbe7a004846b6aa709a1cb31a11e335f5a20d2a7fd35b
  • MD5: e5a6cf272b9d1191e74ce2c9f64064e2

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: 814e9182e488fc28"
        threat_level = "high"
        first_seen = "2026-06-08"
    condition:
        hash.sha256(0, filesize) == "814e9182e488fc28c23dbe7a004846b6aa709a1cb31a11e335f5a20d2a7fd35b"
}

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 (19 indicators)

IOC — FormBook
# SHA256 814e9182e488fc28c23dbe7a004846b6aa709a1cb31a11e335f5a20d2a7fd35b # MD5 e5a6cf272b9d1191e74ce2c9f64064e2 # IP 103.75.160.239 # IP 185.225.75.143 # IP 45.61.136.16 # DOMAIN form-data-collector.com # DOMAIN cloudflare-cdn-analytics.com # DOMAIN api-tracker-stats.net # DOMAIN form-book.club # DOMAIN hxxp://freeupgrades.net/s1xt/ # MUTEX FBMT_7d4a2x_mutex # MUTEX FORM_BOOK_MUTEX # REGISTRY HKCUSoftwareMicrosoftWindowsCurrentVersionRunFormBook # FILEPATH C:ProgramData[random].exe # FILEPATH %TEMP%fbook_tmp.exe # EMAIL formgrab_panel@tutanota.com # EMAIL collector@mailerserver.net # EMAIL receive@formbook-panel.com # URL https://maliciousoffice.ru/gate.php
TypeValueNote
sha256 814e9182e488fc28c23dbe7a004846b6aa709a1cb31a11e335f5a20d2a7fd35b
md5 e5a6cf272b9d1191e74ce2c9f64064e2
ip 103.75.160.239 C2:443
ip 185.225.75.143 FormBook C2 panel EU
ip 45.61.136.16 C2:80
domain form-data-collector.com FormBook HTTP C2 domain
domain cloudflare-cdn-analytics.com FormBook typosquatting Cloudflare domain
domain api-tracker-stats.net FormBook tracker C2
domain form-book.club C2:80
domain hxxp://freeupgrades.net/s1xt/ C2:80
mutex FBMT_7d4a2x_mutex FormBook HTTP C2 mutex pattern
mutex FORM_BOOK_MUTEX FormBook mutex variant
registry HKCUSoftwareMicrosoftWindowsCurrentVersionRunFormBook FormBook autorun
filepath C:ProgramData[random].exe FormBook injection loader
filepath %TEMP%fbook_tmp.exe FormBook gecici dosya
email formgrab_panel@tutanota.com FormBook operator email - Tutanota
email collector@mailerserver.net FormBook web panel exfiltration
email receive@formbook-panel.com FormBook form data alici e-posta
url https://maliciousoffice.ru/gate.php FormBook HTTP C2 gate

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
formbookinfostealermalwarehighsha256analizzenginleştirilmiş