formbook | bd125b43ba0f49c2ee59c8d9c78e35e3a56b578b770ce1e8dfd9b541c3974fb2

Analysis

max time kernel
149s
max time network
100s
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, 11:55

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General

Target
tmpo6egw2y8.js
Size 2.8MB
Sample260602-n3f57act6t
SHA256 bd125b43ba0f49c2ee59c8d9c78e35e3a56b578b770ce1e8dfd9b541c3974fb2
MD5 6b937f2de276f008fb156c82391995a7
SHA1 a3fc2c6c6872f613f83db5306cbfefe591727a0f
SHA512 0fa11ac1e619dd1c9d85fe47f1c74fd5b8360e660154214cc793eabcf53f7cec4266a4b64631ec673daa28fc4e391b878510532b14067657a0100c92432aae3d
SSDEEP 49152:avMSPQ9NzE5epwK/OD3sLgV/mpk0wHZSIZsM12LlYhGRaSemtEQVfHUh:2
TLSH
T175D56C17D66F974E18093B61006A5D9AFE99CAFCEF727BC4E0CF90B614EA1110B851B3
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

adware collection 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/2920-13-0x0000000000B20000-0x0000000000B67000-memory.dmp	family_formbook
behavioral3/memory/2920-19-0x0000000000B20000-0x0000000000B67000-memory.dmp	family_formbook
behavioral3/memory/2920-17-0x0000000000B20000-0x0000000000B67000-memory.dmp	family_formbook
behavioral3/memory/2920-26-0x0000000000B20000-0x0000000000B67000-memory.dmp	family_formbook
behavioral3/memory/1132-28-0x0000000000980000-0x00000000009C4000-memory.dmp	family_formbook
behavioral3/memory/1132-32-0x0000000000980000-0x00000000009C4000-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	4932	wscript.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
2928	powershell.exe

Accesses Microsoft Outlook profiles 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key enumerated	\REGISTRY\USER\S-1-5-21-125073035-2952146151-721812867-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook	mcbuilder.exe

ConfuserEx .NET packer 1 IoCs

Detects ConfuserEx .NET packer.

resource	yara_rule
behavioral3/memory/2928-11-0x0000023F12D80000-0x0000023F12D8C000-memory.dmp	ConfuserEx

Suspicious use of SetThreadContext 13 IoCs

description	pid	Process	procid_target
PID 2928 set thread context of 2920	2928	powershell.exe	89
PID 2920 set thread context of 4932	2920	aspnet_compiler.exe	80
PID 2920 set thread context of 1132	2920	aspnet_compiler.exe	90
PID 2928 set thread context of 1832	2928	powershell.exe	91
PID 1132 set thread context of 4932	1132	mcbuilder.exe	80
PID 2928 set thread context of 3620	2928	powershell.exe	94
PID 2928 set thread context of 696	2928	powershell.exe	97
PID 2928 set thread context of 2540	2928	powershell.exe	100
PID 1132 set thread context of 432	1132	mcbuilder.exe	99
PID 2928 set thread context of 4608	2928	powershell.exe	103
PID 2928 set thread context of 400	2928	powershell.exe	104
PID 2928 set thread context of 5092	2928	powershell.exe	106
PID 1132 set thread context of 4572	1132	mcbuilder.exe	105

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	mcbuilder.exe

Kills process with taskkill 1 IoCs

defense_evasion

pid	Process
2960	taskkill.exe

Modifies Internet Explorer settings 1 TTPs 1 IoCs

adware spyware

Modify Registry

T1112

description	ioc	Process
Key created	\Registry\User\S-1-5-21-125073035-2952146151-721812867-1000\SOFTWARE\Microsoft\Internet Explorer\IntelliForms\Storage2	mcbuilder.exe

Suspicious behavior: EnumeratesProcesses 45 IoCs

pid	Process
2928	powershell.exe
2928	powershell.exe
2928	powershell.exe
2928	powershell.exe
2928	powershell.exe
2928	powershell.exe
2928	powershell.exe
2928	powershell.exe
2928	powershell.exe
2928	powershell.exe
2928	powershell.exe
2928	powershell.exe
2928	powershell.exe
2928	powershell.exe
2920	aspnet_compiler.exe
2920	aspnet_compiler.exe
2920	aspnet_compiler.exe
2920	aspnet_compiler.exe
2928	powershell.exe
1132	mcbuilder.exe
1132	mcbuilder.exe
1132	mcbuilder.exe
1132	mcbuilder.exe
2928	powershell.exe
1832	aspnet_compiler.exe
2928	powershell.exe
2928	powershell.exe
2928	powershell.exe
2928	powershell.exe
2928	powershell.exe
3620	aspnet_compiler.exe
2928	powershell.exe
2928	powershell.exe
2928	powershell.exe
2928	powershell.exe
2928	powershell.exe
696	aspnet_compiler.exe
2928	powershell.exe
2540	aspnet_compiler.exe
2928	powershell.exe
4608	aspnet_compiler.exe
2928	powershell.exe
400	aspnet_compiler.exe
2928	powershell.exe
5092	aspnet_compiler.exe

Suspicious behavior: MapViewOfSection 9 IoCs

pid	Process
2920	aspnet_compiler.exe
4932	wscript.exe
4932	wscript.exe
1132	mcbuilder.exe
1132	mcbuilder.exe
1132	mcbuilder.exe
1132	mcbuilder.exe
1132	mcbuilder.exe
1132	mcbuilder.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2928	powershell.exe
Token: SeDebugPrivilege	2960	taskkill.exe

Suspicious use of WriteProcessMemory 38 IoCs

description	pid	Process	procid_target
PID 4932 wrote to memory of 2928	4932	wscript.exe	82
PID 2928 wrote to memory of 1500	2928	powershell.exe	84
PID 2928 wrote to memory of 1100	2928	powershell.exe	85
PID 2928 wrote to memory of 1496	2928	powershell.exe	86
PID 2928 wrote to memory of 2508	2928	powershell.exe	87
PID 2928 wrote to memory of 4228	2928	powershell.exe	88
PID 2928 wrote to memory of 2920	2928	powershell.exe	89
PID 2928 wrote to memory of 2920	2928	powershell.exe	89
PID 2928 wrote to memory of 2920	2928	powershell.exe	89
PID 4932 wrote to memory of 1132	4932	wscript.exe	90
PID 2928 wrote to memory of 1832	2928	powershell.exe	91
PID 2928 wrote to memory of 1832	2928	powershell.exe	91
PID 2928 wrote to memory of 1832	2928	powershell.exe	91
PID 2928 wrote to memory of 1504	2928	powershell.exe	92
PID 2928 wrote to memory of 1804	2928	powershell.exe	93
PID 2928 wrote to memory of 3620	2928	powershell.exe	94
PID 2928 wrote to memory of 3620	2928	powershell.exe	94
PID 2928 wrote to memory of 3620	2928	powershell.exe	94
PID 2928 wrote to memory of 3628	2928	powershell.exe	95
PID 2928 wrote to memory of 492	2928	powershell.exe	96
PID 2928 wrote to memory of 696	2928	powershell.exe	97
PID 2928 wrote to memory of 696	2928	powershell.exe	97
PID 2928 wrote to memory of 696	2928	powershell.exe	97
PID 1132 wrote to memory of 432	1132	mcbuilder.exe	99
PID 2928 wrote to memory of 2540	2928	powershell.exe	100
PID 2928 wrote to memory of 2540	2928	powershell.exe	100
PID 2928 wrote to memory of 2540	2928	powershell.exe	100
PID 2928 wrote to memory of 4608	2928	powershell.exe	103
PID 2928 wrote to memory of 4608	2928	powershell.exe	103
PID 2928 wrote to memory of 4608	2928	powershell.exe	103
PID 2928 wrote to memory of 400	2928	powershell.exe	104
PID 2928 wrote to memory of 400	2928	powershell.exe	104
PID 2928 wrote to memory of 400	2928	powershell.exe	104
PID 1132 wrote to memory of 4572	1132	mcbuilder.exe	105
PID 2928 wrote to memory of 5092	2928	powershell.exe	106
PID 2928 wrote to memory of 5092	2928	powershell.exe	106
PID 2928 wrote to memory of 5092	2928	powershell.exe	106
PID 4932 wrote to memory of 2960	4932	wscript.exe	108

outlook_office_path 1 IoCs

description	ioc	Process
Key enumerated	\REGISTRY\USER\S-1-5-21-125073035-2952146151-721812867-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook	mcbuilder.exe

C:\Windows\system32\wscript.exe
wscript.exe C:\Users\Admin\AppData\Local\Temp\tmpo6egw2y8.js
1⤵
- Badlisted process makes network request
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:4932
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  powershell.exe -ExecutionPolicy Bypass -NoProfile -WindowStyle Hidden -File "C:\Temp\ps_CFbTw0DiflXz_1780401316206.ps1"
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious use of SetThreadContext
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2928
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:1500
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:1100
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:1496
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:2508
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:4228
- - 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:2920
- - 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:1832
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:1504
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:1804
- - 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:3620
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:3628
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:492
- - 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:696
- - 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:2540
- - 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:4608
- - 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:400
- - 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:5092
- C:\Windows\SysWOW64\mcbuilder.exe
  "C:\Windows\SysWOW64\mcbuilder.exe"
  2⤵
  - Accesses Microsoft Outlook profiles
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Modifies Internet Explorer settings
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of WriteProcessMemory
  - outlook_office_path
  PID:1132
- - C:\Program Files\Google\Chrome\Application\chrome.exe
    "C:\Program Files\Google\Chrome\Application\chrome.exe"
    3⤵
    PID:432
- - C:\Program Files\Mozilla Firefox\Firefox.exe
    "C:\Program Files\Mozilla Firefox\Firefox.exe"
    3⤵
    PID:4572
- C:\Windows\System32\taskkill.exe
  "C:\Windows\System32\taskkill.exe" /f /im wscript.exe
  2⤵
  - Kills process with taskkill
  - Suspicious use of AdjustPrivilegeToken
  PID:2960

C:\Program Files\Google\Chrome\Application\140.0.7339.81\elevation_service.exe
"C:\Program Files\Google\Chrome\Application\140.0.7339.81\elevation_service.exe"
1⤵
PID:240

C:\Program Files\Google\Chrome\Application\140.0.7339.81\elevation_service.exe
"C:\Program Files\Google\Chrome\Application\140.0.7339.81\elevation_service.exe"
1⤵
PID:948

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

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Email Collection

T1114

Command and Control

Exfiltration

Impact

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Downloads

ps_CFbTw0DiflXz_1780401316206.ps1

Path C:\Temp\ps_CFbTw0DiflXz_1780401316206.ps1
Size 2.1MB
SHA256 6b8dee9a582703aed5800f5bd8d1b0362f58ee80746b7f6be88cccb8534fd0e6
MD5 2ed1eb979cee83641420c538f4fdaa29
SHA1 16825edd046380b9fc6335ac9e0676aa3e52cfb8
SHA512 1f3b104d642edb6da833d83e384abc84080f7aba0a1fec4b64d46dd0bde7703483367990204004e6fbfcaeee07c0e832e51ef8a76fecd20e18f980d23282bf69
SSDEEP 24576:Qt88iK13t5aofomKz14m7qdCYli5M4wwCO7t4K+BBVxjBVQASoLUxkjpsPOowS:P
TLSH
T1FEA5BFCAD16E44D29C053FC998242AC78B2586328A7400283A7F7D499F775FFC15EEE6
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

__PSScriptPolicyTest_cyuehb5u.hi3.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_cyuehb5u.hi3.ps1
Size 60B
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
TLSH
T177A02228CC303B200020C0080A000002C00B800C080C8C0220000A00B20B820002F080
MD5 SHA1 SHA512 TLSH

Submit Download

memory/432-39-0x000001DBA8E60000-0x000001DBA8F6C000-memory.dmp

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memory/1132-22-0x0000000000980000-0x00000000009C4000-memory.dmp

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memory/1132-32-0x0000000000980000-0x00000000009C4000-memory.dmp

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memory/1132-28-0x0000000000980000-0x00000000009C4000-memory.dmp

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memory/1132-23-0x0000000000980000-0x00000000009C4000-memory.dmp

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memory/2920-17-0x0000000000B20000-0x0000000000B67000-memory.dmp

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memory/2920-12-0x0000000000400000-0x0000000000447000-memory.dmp

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memory/2920-26-0x0000000000B20000-0x0000000000B67000-memory.dmp

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memory/2920-16-0x0000000001120000-0x0000000001476000-memory.dmp

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memory/2920-20-0x00000000010D0000-0x00000000010F4000-memory.dmp

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memory/2920-19-0x0000000000B20000-0x0000000000B67000-memory.dmp

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memory/2920-13-0x0000000000B20000-0x0000000000B67000-memory.dmp

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memory/2920-27-0x00000000010D0000-0x00000000010F4000-memory.dmp

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memory/2920-24-0x0000000000B20000-0x0000000000B67000-memory.dmp

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memory/2928-18-0x0000023F2B3E0000-0x0000023F2B3F0000-memory.dmp

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memory/2928-14-0x0000023F2B3E0000-0x0000023F2B3F0000-memory.dmp

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memory/2928-2-0x0000023F2B3E0000-0x0000023F2B3F0000-memory.dmp

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memory/2928-15-0x0000023F2B3E0000-0x0000023F2B3F0000-memory.dmp

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memory/2928-11-0x0000023F12D80000-0x0000023F12D8C000-memory.dmp

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memory/2928-1-0x0000023F2B3E0000-0x0000023F2B3F0000-memory.dmp

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memory/2928-3-0x0000023F12D50000-0x0000023F12D72000-memory.dmp

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memory/4572-46-0x000001FFE4160000-0x000001FFE4282000-memory.dmp

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memory/4932-21-0x0000000000D60000-0x0000000001BA0000-memory.dmp

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memory/4932-30-0x0000000000D60000-0x0000000001BA0000-memory.dmp

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memory/4932-31-0x0000018CDB950000-0x0000018CDBA2B000-memory.dmp

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memory/4932-47-0x0000018CDB950000-0x0000018CDBA2B000-memory.dmp

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