FormBook | Threat Level: high | Type: Infostealer

Cryptographic Identifiers

SHA2569ea9adb1f6a80c0f0cba35d3e9b5fa6860d6d39530133bf4641cd012bd024197
MD59744dc7fe3effb3eec5a3aa31178ab95
File Typejs
Size3050.2 KB
First Seen2026-05-08
File NameNEW ORDER #34-9C-042.js
TagsFormBook, js

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: 9ea9adb1f6a80c0f0cba35d3e9b5fa6860d6d39530133bf4641cd012bd024197
  • MD5: 9744dc7fe3effb3eec5a3aa31178ab95

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: 9ea9adb1f6a80c0f"
        threat_level = "high"
        first_seen = "2026-05-08"
    condition:
        hash.sha256(0, filesize) == "9ea9adb1f6a80c0f0cba35d3e9b5fa6860d6d39530133bf4641cd012bd024197"
}

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 9ea9adb1f6a80c0f0cba35d3e9b5fa6860d6d39530133bf4641cd012bd024197 # MD5 9744dc7fe3effb3eec5a3aa31178ab95
TypeValueNote
sha256 9ea9adb1f6a80c0f0cba35d3e9b5fa6860d6d39530133bf4641cd012bd024197 Sample:FormBook
md5 9744dc7fe3effb3eec5a3aa31178ab95 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