formbook | fb4d2aa18accebccee1bac43a7b0e9b06a1a6aeaf0ac56be41e9904cb29d6c2a

Analysis

max time kernel
149s
max time network
104s
platform
windows11-21h2_x64
resource
win11-20250610-en
resource tags

arch:x64arch:x86image:win11-20250610-enlocale:en-usos:windows11-21h2-x64system
submitted
09/10/2025, 17:37

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General

Target
fb4d2aa18accebccee1bac43a7b0e9b06a1a6aeaf0ac56be41e9904cb29d6c2a.exe
Size 1.2MB
Sample251009-v69p8ssl17
SHA256 fb4d2aa18accebccee1bac43a7b0e9b06a1a6aeaf0ac56be41e9904cb29d6c2a
MD5 a97484936efdcbf51c43e2e190f3c47e
SHA1 5208f4dfdc90fc098c2c9f6a43c9849a4487ea6f
SHA512 5f7ac6ace1c8434937a20989a3c3890b2637f2cea84b5df3f0ece355ed8906c1bb1b7d9d9fb5c0a61b58c0f6148e11ce3d319a1ec9e13a4bf0e24391dcedde97
SSDEEP 24576:C5EmXFtKaL4/oFe5T9yyXYfP1ijXdacvFGtUyUlT0dRtlXaer:CPVt/LZeJbInQRacvFGQya
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

discovery formbook rat spyware stealer trojan

Malware Config

Signatures

Formbook
Formbook is a data stealing malware which is capable of stealing data.
trojan spyware stealer formbook
Formbook family
formbook

Formbook payload 1 IoCs

rat

resource	yara_rule
behavioral2/memory/2988-16-0x0000000000400000-0x0000000000449000-memory.dmp	family_formbook

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 604 set thread context of 2988	604	fb4d2aa18accebccee1bac43a7b0e9b06a1a6aeaf0ac56be41e9904cb29d6c2a.exe	80

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2520	604	WerFault.exe	79

System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	fb4d2aa18accebccee1bac43a7b0e9b06a1a6aeaf0ac56be41e9904cb29d6c2a.exe

Suspicious behavior: EnumeratesProcesses 14 IoCs

pid	Process
2988	svchost.exe
2988	svchost.exe
2988	svchost.exe
2988	svchost.exe
2988	svchost.exe
2988	svchost.exe
2988	svchost.exe
2988	svchost.exe
2988	svchost.exe
2988	svchost.exe
2988	svchost.exe
2988	svchost.exe
2988	svchost.exe
2988	svchost.exe

Suspicious behavior: MapViewOfSection 1 IoCs

pid	Process
604	fb4d2aa18accebccee1bac43a7b0e9b06a1a6aeaf0ac56be41e9904cb29d6c2a.exe

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
604	fb4d2aa18accebccee1bac43a7b0e9b06a1a6aeaf0ac56be41e9904cb29d6c2a.exe
604	fb4d2aa18accebccee1bac43a7b0e9b06a1a6aeaf0ac56be41e9904cb29d6c2a.exe

Suspicious use of SendNotifyMessage 2 IoCs

pid	Process
604	fb4d2aa18accebccee1bac43a7b0e9b06a1a6aeaf0ac56be41e9904cb29d6c2a.exe
604	fb4d2aa18accebccee1bac43a7b0e9b06a1a6aeaf0ac56be41e9904cb29d6c2a.exe

Suspicious use of WriteProcessMemory 4 IoCs

description	pid	Process	procid_target
PID 604 wrote to memory of 2988	604	fb4d2aa18accebccee1bac43a7b0e9b06a1a6aeaf0ac56be41e9904cb29d6c2a.exe	80
PID 604 wrote to memory of 2988	604	fb4d2aa18accebccee1bac43a7b0e9b06a1a6aeaf0ac56be41e9904cb29d6c2a.exe	80
PID 604 wrote to memory of 2988	604	fb4d2aa18accebccee1bac43a7b0e9b06a1a6aeaf0ac56be41e9904cb29d6c2a.exe	80
PID 604 wrote to memory of 2988	604	fb4d2aa18accebccee1bac43a7b0e9b06a1a6aeaf0ac56be41e9904cb29d6c2a.exe	80

C:\Users\Admin\AppData\Local\Temp\fb4d2aa18accebccee1bac43a7b0e9b06a1a6aeaf0ac56be41e9904cb29d6c2a.exe
"C:\Users\Admin\AppData\Local\Temp\fb4d2aa18accebccee1bac43a7b0e9b06a1a6aeaf0ac56be41e9904cb29d6c2a.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious behavior: MapViewOfSection
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:604
- C:\Windows\SysWOW64\svchost.exe
  "C:\Users\Admin\AppData\Local\Temp\fb4d2aa18accebccee1bac43a7b0e9b06a1a6aeaf0ac56be41e9904cb29d6c2a.exe"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  PID:2988
- C:\Windows\SysWOW64\WerFault.exe
  C:\Windows\SysWOW64\WerFault.exe -u -p 604 -s 764
  2⤵
  - Program crash
  PID:2520

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 604 -ip 604
1⤵
PID:3692

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

aut889A.tmp

Path C:\Users\Admin\AppData\Local\Temp\aut889A.tmp
Size 289KB
SHA256 f9433342a945c199cff7a95ca0351a5918e4375ba09a1a08292111021f103e47
MD5 9c8d9198fdb5ab7367aa990bed3c4182
SHA1 c3606838e524f9fa9e2581f06389455f4389074b
SHA512 d31e2d5261094cd159c32454e80a5f0480d1d8d46ac328942c405e7bcb1291ab3efbf3906198f89d9d1d7303b0fd6d74e34bfd421fcbc4dd34c47f58165fafac
SSDEEP 6144:Nn0kx/1CGsRRNREyvWinPFAzZ9YqetE9BDGI6G1OhGxhjX3dn5SpMIjJl/:NnzZ/enEsFnP492a6DGn/jdn5S1Jp
MD5 SHA1 SHA512 SSDEEP

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memory/604-12-0x00000000013D0000-0x00000000017D0000-memory.dmp

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memory/2988-13-0x0000000000400000-0x0000000000449000-memory.dmp

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memory/2988-14-0x0000000000400000-0x0000000000449000-memory.dmp

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memory/2988-15-0x0000000001B00000-0x0000000001E56000-memory.dmp

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memory/2988-16-0x0000000000400000-0x0000000000449000-memory.dmp

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