FormBook | Threat Level: high | Type: Infostealer

Cryptographic Identifiers

SHA2566f502816b337a5cf2434e231c8fee9c17a3ece2397e0fb98eb0478c3fd91b817
MD5c960fb9e10a4bbce0431eee036692991
File Typeps1
Size1494.4 KB
First Seen2026-04-25
File NameJHC6AWHS.ps1
TagsFormBook, ps1

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: 6f502816b337a5cf2434e231c8fee9c17a3ece2397e0fb98eb0478c3fd91b817
  • MD5: c960fb9e10a4bbce0431eee036692991

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: 6f502816b337a5cf"
        threat_level = "high"
        first_seen = "2026-04-25"
    condition:
        hash.sha256(0, filesize) == "6f502816b337a5cf2434e231c8fee9c17a3ece2397e0fb98eb0478c3fd91b817"
}

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 6f502816b337a5cf2434e231c8fee9c17a3ece2397e0fb98eb0478c3fd91b817 # MD5 c960fb9e10a4bbce0431eee036692991
TypeValueNote
sha256 6f502816b337a5cf2434e231c8fee9c17a3ece2397e0fb98eb0478c3fd91b817 Sample:FormBook
md5 c960fb9e10a4bbce0431eee036692991 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