FormBook | Threat Level: high | Type: Infostealer
Cryptographic Identifiers
| SHA256 | 5bceece689069ee417d87d9404901f42573ad70b32f7f0688041cd979217e19b |
|---|---|
| MD5 | ae231bde562332c9d66044c450e92a14 |
| File Type | lzh |
| Size | 1089.3 KB |
| First Seen | 2026-05-21 |
| File Name | quotation.lzh |
| Tags | FormBook, lzh |
Malware Family: FormBook
FormBook, MaaS stealer'dır.
| Type | Infostealer |
|---|---|
| Programming Language | C |
| Target Platform | Windows |
| C2 Protocol | HTTP |
| Purpose | Form verisi hırsızlığı |
| First Seen Year | 2016 |
| Aliases | xLoader |
Threat Indicators (IOC)
- SHA256:
5bceece689069ee417d87d9404901f42573ad70b32f7f0688041cd979217e19b - MD5:
ae231bde562332c9d66044c450e92a14
You can verify all hash values of this sample on VirusTotal.
System Cleanup Guide
- Disconnect the system from the network immediately
- Yeni bir cihazdan banka hesabı, sosyal medya ve e-posta şifrelerini değiştirin
- Move crypto wallets to a new address and abandon the old ones
- Start a full scan with up-to-date antivirus
- Clear saved browser passwords and enable 2FA
- Sign out of all sessions on every affected service
YARA Rule Hints
rule FormBook_SHA256 {
meta:
description = "FormBook sample: 5bceece689069ee4"
threat_level = "high"
first_seen = "2026-05-21"
condition:
hash.sha256(0, filesize) == "5bceece689069ee417d87d9404901f42573ad70b32f7f0688041cd979217e19b"
}
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
5bceece689069ee417d87d9404901f42573ad70b32f7f0688041cd979217e19b
# MD5
ae231bde562332c9d66044c450e92a14
| Type | Value | Note |
|---|---|---|
| sha256 | 5bceece689069ee417d87d9404901f42573ad70b32f7f0688041cd979217e19b | Sample:FormBook |
| md5 | ae231bde562332c9d66044c450e92a14 | 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.