formbook | bc3ac9ee4158d4ab67adcf4dc4c4134ad68335438b7e5afdcddbb24c2e832a91

Analysis

max time kernel
149s
max time network
97s
platform
windows11-21h2_x64
resource
win11-20260513-en
resource tags

arch:x64arch:x86image:win11-20260513-enlocale:en-usos:windows11-21h2-x64systemwindows
submitted
02/06/2026, 12:31

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General

Target
tmpsao01l4t.js
Size 1.9MB
Sample260602-pp85gsds91
SHA256 bc3ac9ee4158d4ab67adcf4dc4c4134ad68335438b7e5afdcddbb24c2e832a91
MD5 4c4173b7bffdb12e2ec642f3637caefb
SHA1 888cf62358e924b162f3b77c61750f7e13777a72
SHA512 ce0ab9b5a949174c6a5cc322800300b6044c8cbe3ba3b7d8bdbb2edf2b6a2f02d4eef6e4369299678ccb85841014ca4cae05320bb17f98fabf2b5224df2d0adc
SSDEEP 24576:SB8O6sVnvGdMk2mIHMI5BFBPTG4QWCv4jJI68V6MSbtQPGaNv2gFiu/mOk:SBP62GioITG9z0xYKQlw7
TLSH
T19495021189C42FB4CFAC561980FD260E93F04A9A541AB98DFB73BE4BFFA7604520719D
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

defense_evasion discovery execution formbook 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 6 IoCs

rat

resource	yara_rule
behavioral3/memory/4120-15-0x0000000000BF0000-0x0000000000C36000-memory.dmp	family_formbook
behavioral3/memory/4120-19-0x0000000000BF0000-0x0000000000C36000-memory.dmp	family_formbook
behavioral3/memory/4120-20-0x0000000000BF0000-0x0000000000C36000-memory.dmp	family_formbook
behavioral3/memory/4120-27-0x0000000000BF0000-0x0000000000C36000-memory.dmp	family_formbook
behavioral3/memory/1672-29-0x0000000000320000-0x0000000000363000-memory.dmp	family_formbook
behavioral3/memory/1672-33-0x0000000000320000-0x0000000000363000-memory.dmp	family_formbook

Badlisted process makes network request 1 IoCs

Network request originating from process or tool commonly abused by malware.

flow	pid	Process
2	4440	wscript.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
3208	powershell.exe

ConfuserEx .NET packer 1 IoCs

Detects ConfuserEx .NET packer.

resource	yara_rule
behavioral3/memory/3208-12-0x0000020EAC4A0000-0x0000020EAC4B0000-memory.dmp	ConfuserEx

Suspicious use of SetThreadContext 11 IoCs

description	pid	Process	procid_target
PID 3208 set thread context of 4120	3208	powershell.exe	88
PID 4120 set thread context of 4440	4120	aspnet_compiler.exe	80
PID 4120 set thread context of 1672	4120	aspnet_compiler.exe	89
PID 3208 set thread context of 4004	3208	powershell.exe	90
PID 1672 set thread context of 4440	1672	newdev.exe	80
PID 3208 set thread context of 4200	3208	powershell.exe	91
PID 3208 set thread context of 1160	3208	powershell.exe	93
PID 3208 set thread context of 2480	3208	powershell.exe	94
PID 3208 set thread context of 1796	3208	powershell.exe	95
PID 3208 set thread context of 1756	3208	powershell.exe	96
PID 3208 set thread context of 4328	3208	powershell.exe	97

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	newdev.exe

Kills process with taskkill 1 IoCs

defense_evasion

pid	Process
1240	taskkill.exe

Suspicious behavior: EnumeratesProcesses 39 IoCs

pid	Process
3208	powershell.exe
3208	powershell.exe
3208	powershell.exe
3208	powershell.exe
3208	powershell.exe
3208	powershell.exe
3208	powershell.exe
3208	powershell.exe
3208	powershell.exe
3208	powershell.exe
3208	powershell.exe
3208	powershell.exe
3208	powershell.exe
3208	powershell.exe
4120	aspnet_compiler.exe
4120	aspnet_compiler.exe
4120	aspnet_compiler.exe
4120	aspnet_compiler.exe
3208	powershell.exe
1672	newdev.exe
1672	newdev.exe
1672	newdev.exe
1672	newdev.exe
3208	powershell.exe
4004	aspnet_compiler.exe
3208	powershell.exe
4200	aspnet_compiler.exe
3208	powershell.exe
3208	powershell.exe
3208	powershell.exe
1160	aspnet_compiler.exe
3208	powershell.exe
2480	aspnet_compiler.exe
3208	powershell.exe
1796	aspnet_compiler.exe
3208	powershell.exe
1756	aspnet_compiler.exe
3208	powershell.exe
4328	aspnet_compiler.exe

Suspicious behavior: MapViewOfSection 5 IoCs

pid	Process
4120	aspnet_compiler.exe
4440	wscript.exe
4440	wscript.exe
1672	newdev.exe
1672	newdev.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3208	powershell.exe
Token: SeDebugPrivilege	1240	taskkill.exe

Suspicious use of WriteProcessMemory 33 IoCs

description	pid	Process	procid_target
PID 4440 wrote to memory of 3208	4440	wscript.exe	81
PID 3208 wrote to memory of 4420	3208	powershell.exe	83
PID 3208 wrote to memory of 4584	3208	powershell.exe	84
PID 3208 wrote to memory of 4544	3208	powershell.exe	85
PID 3208 wrote to memory of 388	3208	powershell.exe	86
PID 3208 wrote to memory of 3100	3208	powershell.exe	87
PID 3208 wrote to memory of 4120	3208	powershell.exe	88
PID 3208 wrote to memory of 4120	3208	powershell.exe	88
PID 3208 wrote to memory of 4120	3208	powershell.exe	88
PID 4440 wrote to memory of 1672	4440	wscript.exe	89
PID 3208 wrote to memory of 4004	3208	powershell.exe	90
PID 3208 wrote to memory of 4004	3208	powershell.exe	90
PID 3208 wrote to memory of 4004	3208	powershell.exe	90
PID 3208 wrote to memory of 4200	3208	powershell.exe	91
PID 3208 wrote to memory of 4200	3208	powershell.exe	91
PID 3208 wrote to memory of 4200	3208	powershell.exe	91
PID 3208 wrote to memory of 4644	3208	powershell.exe	92
PID 3208 wrote to memory of 1160	3208	powershell.exe	93
PID 3208 wrote to memory of 1160	3208	powershell.exe	93
PID 3208 wrote to memory of 1160	3208	powershell.exe	93
PID 3208 wrote to memory of 2480	3208	powershell.exe	94
PID 3208 wrote to memory of 2480	3208	powershell.exe	94
PID 3208 wrote to memory of 2480	3208	powershell.exe	94
PID 3208 wrote to memory of 1796	3208	powershell.exe	95
PID 3208 wrote to memory of 1796	3208	powershell.exe	95
PID 3208 wrote to memory of 1796	3208	powershell.exe	95
PID 3208 wrote to memory of 1756	3208	powershell.exe	96
PID 3208 wrote to memory of 1756	3208	powershell.exe	96
PID 3208 wrote to memory of 1756	3208	powershell.exe	96
PID 3208 wrote to memory of 4328	3208	powershell.exe	97
PID 3208 wrote to memory of 4328	3208	powershell.exe	97
PID 3208 wrote to memory of 4328	3208	powershell.exe	97
PID 4440 wrote to memory of 1240	4440	wscript.exe	99

C:\Windows\system32\wscript.exe
wscript.exe C:\Users\Admin\AppData\Local\Temp\tmpsao01l4t.js
1⤵
- Badlisted process makes network request
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:4440
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  powershell.exe -ExecutionPolicy Bypass -NoProfile -WindowStyle Hidden -File "C:\Temp\ps_vKiwdq0rizaB_1780403491363.ps1"
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious use of SetThreadContext
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3208
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:4420
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:4584
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:4544
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:388
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:3100
- - 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:4120
- - 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:4004
- - 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:4200
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:4644
- - 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:1160
- - 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:2480
- - 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:1796
- - 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:1756
- - 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:4328
- C:\Windows\SysWOW64\newdev.exe
  "C:\Windows\SysWOW64\newdev.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: MapViewOfSection
  PID:1672
- C:\Windows\System32\taskkill.exe
  "C:\Windows\System32\taskkill.exe" /f /im wscript.exe
  2⤵
  - Kills process with taskkill
  - Suspicious use of AdjustPrivilegeToken
  PID:1240

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

JavaScript

T1059.007

PowerShell

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

ps_vKiwdq0rizaB_1780403491363.ps1

Path C:\Temp\ps_vKiwdq0rizaB_1780403491363.ps1
Size 1.4MB
SHA256 7689ba1a05e782922baedc4b4f31468d0a39063d8b114c64affeeff5ab901368
MD5 123a34d0787e2f3b42998ef0a9689f8c
SHA1 f5d0d4cf24c1a5671db501d9630dd1b59787370a
SHA512 8dd1efefd509655d756e0e626643dc9e8397af7039207673815056c1a8670fa2cd0b99a80b282bd38b9d1ce2028c89eab6ea7cc7b4c33bd0d95e8108733add20
SSDEEP 24576:fWgSwfYWKRY0FBGo9Yb4g3zp7CMLA8EdqDM3uyel1G6G8UK/AllZdubI9pBTgHYy:nXKRYl/EdxXenVaZdo2phEfD
TLSH
T188653300CF969C7B25BCA71DA0BF7E198B637EC2A84D9CE31495ADC7057C2468977828
MD5 SHA1 SHA512 SSDEEP TLSH

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__PSScriptPolicyTest_uqvxqhqj.5hq.ps1

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

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memory/1672-23-0x0000000000320000-0x0000000000363000-memory.dmp

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memory/1672-33-0x0000000000320000-0x0000000000363000-memory.dmp

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memory/1672-29-0x0000000000320000-0x0000000000363000-memory.dmp

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memory/1672-24-0x0000000000320000-0x0000000000363000-memory.dmp

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memory/3208-12-0x0000020EAC4A0000-0x0000020EAC4B0000-memory.dmp

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memory/3208-1-0x0000020EAA420000-0x0000020EAA430000-memory.dmp

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memory/3208-16-0x0000020EAA420000-0x0000020EAA430000-memory.dmp

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memory/3208-2-0x0000020EAA420000-0x0000020EAA430000-memory.dmp

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memory/3208-3-0x0000020EAA3D0000-0x0000020EAA3F2000-memory.dmp

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memory/3208-10-0x0000020EAA420000-0x0000020EAA430000-memory.dmp

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memory/3208-17-0x0000020EAA420000-0x0000020EAA430000-memory.dmp

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memory/3208-13-0x0000020EAC4B0000-0x0000020EAC4B6000-memory.dmp

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memory/4120-28-0x0000000000F40000-0x0000000000F65000-memory.dmp

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memory/4120-20-0x0000000000BF0000-0x0000000000C36000-memory.dmp

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memory/4120-19-0x0000000000BF0000-0x0000000000C36000-memory.dmp

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memory/4120-18-0x0000000000FB0000-0x0000000001306000-memory.dmp

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memory/4120-25-0x0000000000BF0000-0x0000000000C36000-memory.dmp

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memory/4120-21-0x0000000000F40000-0x0000000000F65000-memory.dmp

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memory/4120-27-0x0000000000BF0000-0x0000000000C36000-memory.dmp

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memory/4120-14-0x0000000000400000-0x0000000000446000-memory.dmp

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memory/4120-15-0x0000000000BF0000-0x0000000000C36000-memory.dmp

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memory/4440-22-0x0000000000A00000-0x0000000001968000-memory.dmp

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memory/4440-31-0x0000000000A00000-0x0000000001968000-memory.dmp

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memory/4440-32-0x000001E854210000-0x000001E854300000-memory.dmp

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memory/4440-40-0x000001E854210000-0x000001E854300000-memory.dmp

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