FormBook | Threat Level: high | Type: Infostealer

Cryptographic Identifiers

SHA256e47f1d558596ef3dae9ce6e78476c7d69b09701f05f4dcd59338a03cf7a3b5b3
MD57d72e5e9bd2e52500e36567852f66d45
File Typerar
Size715.2 KB
First Seen2026-05-20
File NameRemittance_90523_03.rar
TagsFormBook, rar

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: e47f1d558596ef3dae9ce6e78476c7d69b09701f05f4dcd59338a03cf7a3b5b3
  • MD5: 7d72e5e9bd2e52500e36567852f66d45

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: e47f1d558596ef3d"
        threat_level = "high"
        first_seen = "2026-05-20"
    condition:
        hash.sha256(0, filesize) == "e47f1d558596ef3dae9ce6e78476c7d69b09701f05f4dcd59338a03cf7a3b5b3"
}

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 e47f1d558596ef3dae9ce6e78476c7d69b09701f05f4dcd59338a03cf7a3b5b3 # MD5 7d72e5e9bd2e52500e36567852f66d45
TypeValueNote
sha256 e47f1d558596ef3dae9ce6e78476c7d69b09701f05f4dcd59338a03cf7a3b5b3 Sample:FormBook
md5 7d72e5e9bd2e52500e36567852f66d45 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