FormBook | Threat Level: high | Type: Infostealer

Cryptographic Identifiers

SHA2563bc43d4206d4080b1238b58de3e9015f0ae3a6177ece93c6fd7ee9d9c11ae3f1
MD59b1ea2da77c5320a6861592f40ab8a0e
File Typelzh
Size774.0 KB
First Seen2026-05-20
File NameQuotation.lzh
TagsFormBook, lzh

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: 3bc43d4206d4080b1238b58de3e9015f0ae3a6177ece93c6fd7ee9d9c11ae3f1
  • MD5: 9b1ea2da77c5320a6861592f40ab8a0e

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: 3bc43d4206d4080b"
        threat_level = "high"
        first_seen = "2026-05-20"
    condition:
        hash.sha256(0, filesize) == "3bc43d4206d4080b1238b58de3e9015f0ae3a6177ece93c6fd7ee9d9c11ae3f1"
}

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 3bc43d4206d4080b1238b58de3e9015f0ae3a6177ece93c6fd7ee9d9c11ae3f1 # MD5 9b1ea2da77c5320a6861592f40ab8a0e
TypeValueNote
sha256 3bc43d4206d4080b1238b58de3e9015f0ae3a6177ece93c6fd7ee9d9c11ae3f1 Sample:FormBook
md5 9b1ea2da77c5320a6861592f40ab8a0e 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