formbook | ff21a907e02f5ac9e58543c9ddd8f259f1c5f5f4298a1df45aa6c93dff471462

Analysis

max time kernel
149s
max time network
143s
platform
windows11-21h2_x64
resource
win11-20260513-en
resource tags

arch:x64arch:x86image:win11-20260513-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
23/05/2026, 00:02

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General

Target
tmpm96x2m91.js
Size 1.9MB
Sample260523-abl1gagy6l
SHA256 ff21a907e02f5ac9e58543c9ddd8f259f1c5f5f4298a1df45aa6c93dff471462
MD5 f3a71a39cf413a36dcd0cc935820319d
SHA1 1ef81c538117b743c111e78902905994d06eb4d1
SHA512 3d9322b271d51d751aa38453d5443f0d936382af43b93f8e55e7db471a923dbf0b38ecf2288e98467e146bf9c6483c02257db824d43e353f94a969f4abe4f186
SSDEEP 24576:4wZ6pMeeGeJcs6vRdzbP02GivMgb/Q0eHlH4bxJZ7CFa+k2jpMdRSFRVZRlNasXO:1QpMNJYzKAD64nZOFaFdMvjM
TLSH
T13595021189C86FB9DFAC561C40FE160E53E04E8A5426B98EFB33FD46AFE7904520B1D9
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery execution formbook persistence rat spyware stealer trojan

Malware Config

Signatures

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

Formbook payload 2 IoCs

rat

resource	yara_rule
behavioral3/memory/4416-26-0x0000000000400000-0x0000000000446000-memory.dmp	family_formbook
behavioral3/memory/5080-34-0x0000000000B50000-0x0000000000B93000-memory.dmp	family_formbook

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
4864	powershell.exe

Drops startup file 1 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\SystemUpdate_AsY6TjbYkJAD_1779494543687.lnk	wscript.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1679180529-4058988202-686829476-1000\Software\Microsoft\Windows\CurrentVersion\Run\SystemUpdate_AsY6TjbYkJAD_1779494543687 = "powershell.exe -ExecutionPolicy Bypass -WindowStyle Hidden -File \"C:\\Temp\\ps_AsY6TjbYkJAD_1779494543687.ps1\""	wscript.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SystemUpdate_AsY6TjbYkJAD_1779494543687 = "powershell.exe -ExecutionPolicy Bypass -WindowStyle Hidden -File \"C:\\Temp\\ps_AsY6TjbYkJAD_1779494543687.ps1\""	wscript.exe

ConfuserEx .NET packer 1 IoCs

Detects ConfuserEx .NET packer.

resource	yara_rule
behavioral3/memory/4864-21-0x000001F7484F0000-0x000001F748500000-memory.dmp	ConfuserEx

Suspicious use of SetThreadContext 11 IoCs

description	pid	Process	procid_target
PID 4864 set thread context of 4416	4864	powershell.exe	91
PID 4416 set thread context of 752	4416	aspnet_compiler.exe	80
PID 4416 set thread context of 5080	4416	aspnet_compiler.exe	92
PID 4864 set thread context of 392	4864	powershell.exe	93
PID 5080 set thread context of 3592	5080	PresentationHost.exe
PID 4864 set thread context of 3644	4864	powershell.exe	94
PID 4864 set thread context of 1244	4864	powershell.exe	96
PID 4864 set thread context of 2836	4864	powershell.exe	97
PID 4864 set thread context of 4252	4864	powershell.exe	98
PID 4864 set thread context of 4708	4864	powershell.exe	101
PID 4864 set thread context of 3204	4864	powershell.exe	102

Command and Scripting Interpreter: JavaScript 1 TTPs
execution

JavaScript
T1059.007
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

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	PresentationHost.exe

Suspicious behavior: EnumeratesProcesses 60 IoCs

pid	Process
4864	powershell.exe
4864	powershell.exe
3168	powershell.exe
3168	powershell.exe
4864	powershell.exe
4864	powershell.exe
4864	powershell.exe
4864	powershell.exe
4864	powershell.exe
4864	powershell.exe
4864	powershell.exe
4864	powershell.exe
4864	powershell.exe
4864	powershell.exe
4864	powershell.exe
4864	powershell.exe
4416	aspnet_compiler.exe
4416	aspnet_compiler.exe
4416	aspnet_compiler.exe
4416	aspnet_compiler.exe
4416	aspnet_compiler.exe
4416	aspnet_compiler.exe
4416	aspnet_compiler.exe
4416	aspnet_compiler.exe
4864	powershell.exe
5080	PresentationHost.exe
5080	PresentationHost.exe
5080	PresentationHost.exe
5080	PresentationHost.exe
5080	PresentationHost.exe
5080	PresentationHost.exe
5080	PresentationHost.exe
5080	PresentationHost.exe
4864	powershell.exe
392	aspnet_compiler.exe
392	aspnet_compiler.exe
4864	powershell.exe
3644	aspnet_compiler.exe
3644	aspnet_compiler.exe
4864	powershell.exe
4864	powershell.exe
4864	powershell.exe
1244	aspnet_compiler.exe
1244	aspnet_compiler.exe
4864	powershell.exe
2836	aspnet_compiler.exe
2836	aspnet_compiler.exe
4864	powershell.exe
4252	aspnet_compiler.exe
4252	aspnet_compiler.exe
4864	powershell.exe
4864	powershell.exe
4864	powershell.exe
4864	powershell.exe
4864	powershell.exe
4708	aspnet_compiler.exe
4708	aspnet_compiler.exe
4864	powershell.exe
3204	aspnet_compiler.exe
3204	aspnet_compiler.exe

Suspicious behavior: MapViewOfSection 5 IoCs

pid	Process
4416	aspnet_compiler.exe
752	wscript.exe
752	wscript.exe
5080	PresentationHost.exe
5080	PresentationHost.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4864	powershell.exe
Token: SeDebugPrivilege	3168	powershell.exe

Suspicious use of WriteProcessMemory 34 IoCs

description	pid	Process	procid_target
PID 752 wrote to memory of 4864	752	wscript.exe	81
PID 4864 wrote to memory of 1104	4864	powershell.exe	86
PID 4864 wrote to memory of 1568	4864	powershell.exe	87
PID 4864 wrote to memory of 1420	4864	powershell.exe	88
PID 4864 wrote to memory of 2884	4864	powershell.exe	89
PID 4864 wrote to memory of 924	4864	powershell.exe	90
PID 4864 wrote to memory of 4416	4864	powershell.exe	91
PID 4864 wrote to memory of 4416	4864	powershell.exe	91
PID 4864 wrote to memory of 4416	4864	powershell.exe	91
PID 752 wrote to memory of 5080	752	wscript.exe	92
PID 4864 wrote to memory of 392	4864	powershell.exe	93
PID 4864 wrote to memory of 392	4864	powershell.exe	93
PID 4864 wrote to memory of 392	4864	powershell.exe	93
PID 4864 wrote to memory of 3644	4864	powershell.exe	94
PID 4864 wrote to memory of 3644	4864	powershell.exe	94
PID 4864 wrote to memory of 3644	4864	powershell.exe	94
PID 4864 wrote to memory of 1736	4864	powershell.exe	95
PID 4864 wrote to memory of 1244	4864	powershell.exe	96
PID 4864 wrote to memory of 1244	4864	powershell.exe	96
PID 4864 wrote to memory of 1244	4864	powershell.exe	96
PID 4864 wrote to memory of 2836	4864	powershell.exe	97
PID 4864 wrote to memory of 2836	4864	powershell.exe	97
PID 4864 wrote to memory of 2836	4864	powershell.exe	97
PID 4864 wrote to memory of 4252	4864	powershell.exe	98
PID 4864 wrote to memory of 4252	4864	powershell.exe	98
PID 4864 wrote to memory of 4252	4864	powershell.exe	98
PID 4864 wrote to memory of 3060	4864	powershell.exe	99
PID 4864 wrote to memory of 1248	4864	powershell.exe	100
PID 4864 wrote to memory of 4708	4864	powershell.exe	101
PID 4864 wrote to memory of 4708	4864	powershell.exe	101
PID 4864 wrote to memory of 4708	4864	powershell.exe	101
PID 4864 wrote to memory of 3204	4864	powershell.exe	102
PID 4864 wrote to memory of 3204	4864	powershell.exe	102
PID 4864 wrote to memory of 3204	4864	powershell.exe	102

C:\Windows\system32\wscript.exe
wscript.exe C:\Users\Admin\AppData\Local\Temp\tmpm96x2m91.js
1⤵
- Drops startup file
- Adds Run key to start application
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:752
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  powershell.exe -ExecutionPolicy Bypass -NoProfile -WindowStyle Hidden -NonInteractive -NoLogo -File "C:\Temp\ps_AsY6TjbYkJAD_1779494543687.ps1"
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious use of SetThreadContext
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4864
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:1104
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:1568
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:1420
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:2884
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:924
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    - Suspicious use of SetThreadContext
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious behavior: MapViewOfSection
    PID:4416
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    PID:392
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    PID:3644
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:1736
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    PID:1244
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    PID:2836
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    PID:4252
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:3060
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:1248
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    PID:4708
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    PID:3204
- C:\Windows\SysWOW64\PresentationHost.exe
  "C:\Windows\SysWOW64\PresentationHost.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: MapViewOfSection
  PID:5080

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3168

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

JavaScript

T1059.007

PowerShell

T1059.001

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

ps_AsY6TjbYkJAD_1779494543687.ps1

Path C:\Temp\ps_AsY6TjbYkJAD_1779494543687.ps1
Size 1.4MB
SHA256 747b26542b449ba67483baa9abeec58f5734d5921e635d5411c0a1876272bab1
MD5 c4f013b85f0202ba293300bbe7421a60
SHA1 f86dd77bd5b9e09cc34951c7166be0bb8e139cce
SHA512 ea87b38a61f351aab1e900df20f54bcada4a07e28356846962a7f656a731ebca9727d88627c8a09f493621ef865ff7358aede38b29c862eede23900d6620acc0
SSDEEP 24576:o/+4+FoUKltIcb2wLnujB6mPZiwnSXvHsqX/LMKVPkTq6uAmxyFpWQdWSW:o/B+F8Z1rm4yDSLX/DVPVxypa
TLSH
T123653350CFE6AED21574C27D45FFBB1950EAA6FE889534CB912D62C3862EF01E40371A
MD5 SHA1 SHA512 SSDEEP TLSH

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ModuleAnalysisCache

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\ModuleAnalysisCache
Size 62KB
SHA256 7d4d60d0e7cf2bc4a6983f8343bdeb540be0cd83c7e7a42201239377d71472bd
MD5 536828fea49057066aed0ef2042e8af5
SHA1 37bcf8a34d91fd7543579e1c0f6d23d2b6fc4132
SHA512 76378bd7a01f749748f7d7d61650577c6f63c9000cd76fe802e7f9924d3aa14f942bec72e2de0b26041544d6add7a35060be4a144b5b31953f0efa11ae248a07
SSDEEP 1536:LflJdxinHzwsYyYkzvHgfKQaUpeE711kDa5ljNC+jH0IMjMXYo3hibjoRjdvRBMQ:LflJdInHzpYyYkzvHgfKQaUpeE711kDQ
TLSH
T11F537392E9204E75E2A65F3EF15622627D30394690F8113212DC25EFA987D930B1F7FE
MD5 SHA1 SHA512 SSDEEP TLSH

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__PSScriptPolicyTest_s3djqnvi.jbq.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_s3djqnvi.jbq.ps1
Size 60B
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
TLSH
T177A02228CC303B200020C0080A000002C00B800C080C8C0220000A00B20B820002F080
MD5 SHA1 SHA512 TLSH

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memory/3168-29-0x000001F862C60000-0x000001F862C70000-memory.dmp

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memory/3168-28-0x000001F862C60000-0x000001F862C70000-memory.dmp

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memory/3168-13-0x000001F862C60000-0x000001F862C70000-memory.dmp

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memory/3168-20-0x000001F864EA0000-0x000001F864EE6000-memory.dmp

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memory/4416-23-0x0000000000400000-0x0000000000446000-memory.dmp

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memory/4416-26-0x0000000000400000-0x0000000000446000-memory.dmp

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memory/4864-21-0x000001F7484F0000-0x000001F748500000-memory.dmp

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memory/4864-22-0x000001F748500000-0x000001F748506000-memory.dmp

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memory/4864-25-0x000001F746450000-0x000001F746460000-memory.dmp

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memory/4864-24-0x000001F746450000-0x000001F746460000-memory.dmp

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memory/4864-11-0x000001F746450000-0x000001F746460000-memory.dmp

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memory/4864-27-0x000001F746450000-0x000001F746460000-memory.dmp

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memory/4864-3-0x000001F746450000-0x000001F746460000-memory.dmp

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memory/4864-6-0x000001F7463E0000-0x000001F746402000-memory.dmp

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memory/4864-2-0x000001F746450000-0x000001F746460000-memory.dmp

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memory/5080-30-0x0000000000B50000-0x0000000000B93000-memory.dmp

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memory/5080-34-0x0000000000B50000-0x0000000000B93000-memory.dmp

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