formbook | bd125b43ba0f49c2ee59c8d9c78e35e3a56b578b770ce1e8dfd9b541c3974fb2

Analysis

max time kernel
59s
max time network
63s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260709-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
03/08/2026, 08:25

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General

Target
mal.js
Size 2.8MB
Sample260803-kbe72aem6x
SHA256 bd125b43ba0f49c2ee59c8d9c78e35e3a56b578b770ce1e8dfd9b541c3974fb2
MD5 6b937f2de276f008fb156c82391995a7
SHA1 a3fc2c6c6872f613f83db5306cbfefe591727a0f
SHA512 0fa11ac1e619dd1c9d85fe47f1c74fd5b8360e660154214cc793eabcf53f7cec4266a4b64631ec673daa28fc4e391b878510532b14067657a0100c92432aae3d
SSDEEP 49152:avMSPQ9NzE5epwK/OD3sLgV/mpk0wHZSIZsM12LlYhGRaSemtEQVfHUh:2
TLSH
T175D56C17D66F974E18093B61006A5D9AFE99CAFCEF727BC4E0CF90B614EA1110B851B3
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 5 IoCs

rat

resource	yara_rule
behavioral2/memory/4388-25-0x0000000001470000-0x00000000014B7000-memory.dmp	family_formbook
behavioral2/memory/4388-28-0x0000000001470000-0x00000000014B7000-memory.dmp	family_formbook
behavioral2/memory/4388-34-0x0000000001470000-0x00000000014B7000-memory.dmp	family_formbook
behavioral2/memory/4720-37-0x0000000000970000-0x00000000009B4000-memory.dmp	family_formbook
behavioral2/memory/4720-41-0x0000000000970000-0x00000000009B4000-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
9	5976	wscript.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
2944	powershell.exe

ConfuserEx .NET packer 1 IoCs

Detects ConfuserEx .NET packer.

resource	yara_rule
behavioral2/memory/2944-20-0x00000282BDA80000-0x00000282BDA8C000-memory.dmp	ConfuserEx

Suspicious use of SetThreadContext 9 IoCs

description	pid	Process	procid_target
PID 2944 set thread context of 4388	2944	powershell.exe	96
PID 4388 set thread context of 5976	4388	aspnet_compiler.exe	87
PID 4388 set thread context of 4720	4388	aspnet_compiler.exe	97
PID 2944 set thread context of 2276	2944	powershell.exe	99
PID 4720 set thread context of 5976	4720	mcbuilder.exe	87
PID 2944 set thread context of 2772	2944	powershell.exe	101
PID 2944 set thread context of 5852	2944	powershell.exe	102
PID 2944 set thread context of 3484	2944	powershell.exe	103
PID 2944 set thread context of 1408	2944	powershell.exe	104

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
1816	taskkill.exe

Suspicious behavior: EnumeratesProcesses 36 IoCs

pid	Process
2944	powershell.exe
2944	powershell.exe
2944	powershell.exe
2944	powershell.exe
2944	powershell.exe
2944	powershell.exe
2944	powershell.exe
2944	powershell.exe
2944	powershell.exe
2944	powershell.exe
2944	powershell.exe
2944	powershell.exe
2944	powershell.exe
2944	powershell.exe
4388	aspnet_compiler.exe
4388	aspnet_compiler.exe
4388	aspnet_compiler.exe
4388	aspnet_compiler.exe
2944	powershell.exe
2944	powershell.exe
4720	mcbuilder.exe
4720	mcbuilder.exe
4720	mcbuilder.exe
4720	mcbuilder.exe
2944	powershell.exe
2944	powershell.exe
2944	powershell.exe
2276	aspnet_compiler.exe
2944	powershell.exe
2772	aspnet_compiler.exe
2944	powershell.exe
5852	aspnet_compiler.exe
2944	powershell.exe
3484	aspnet_compiler.exe
2944	powershell.exe
1408	aspnet_compiler.exe

Suspicious behavior: MapViewOfSection 5 IoCs

pid	Process
4388	aspnet_compiler.exe
5976	wscript.exe
5976	wscript.exe
4720	mcbuilder.exe
4720	mcbuilder.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2944	powershell.exe
Token: SeDebugPrivilege	1816	taskkill.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 5976 wrote to memory of 2944	5976	wscript.exe	89
PID 2944 wrote to memory of 4604	2944	powershell.exe	91
PID 2944 wrote to memory of 6068	2944	powershell.exe	92
PID 2944 wrote to memory of 3432	2944	powershell.exe	93
PID 2944 wrote to memory of 760	2944	powershell.exe	94
PID 2944 wrote to memory of 5892	2944	powershell.exe	95
PID 2944 wrote to memory of 4388	2944	powershell.exe	96
PID 2944 wrote to memory of 4388	2944	powershell.exe	96
PID 2944 wrote to memory of 4388	2944	powershell.exe	96
PID 5976 wrote to memory of 4720	5976	wscript.exe	97
PID 2944 wrote to memory of 5884	2944	powershell.exe	98
PID 2944 wrote to memory of 2276	2944	powershell.exe	99
PID 2944 wrote to memory of 2276	2944	powershell.exe	99
PID 2944 wrote to memory of 2276	2944	powershell.exe	99
PID 2944 wrote to memory of 2772	2944	powershell.exe	101
PID 2944 wrote to memory of 2772	2944	powershell.exe	101
PID 2944 wrote to memory of 2772	2944	powershell.exe	101
PID 2944 wrote to memory of 5852	2944	powershell.exe	102
PID 2944 wrote to memory of 5852	2944	powershell.exe	102
PID 2944 wrote to memory of 5852	2944	powershell.exe	102
PID 2944 wrote to memory of 3484	2944	powershell.exe	103
PID 2944 wrote to memory of 3484	2944	powershell.exe	103
PID 2944 wrote to memory of 3484	2944	powershell.exe	103
PID 2944 wrote to memory of 1408	2944	powershell.exe	104
PID 2944 wrote to memory of 1408	2944	powershell.exe	104
PID 2944 wrote to memory of 1408	2944	powershell.exe	104
PID 5976 wrote to memory of 1816	5976	wscript.exe	106

C:\Windows\system32\wscript.exe
wscript.exe C:\Users\Admin\AppData\Local\Temp\mal.js
1⤵
- Badlisted process makes network request
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:5976
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  powershell.exe -ExecutionPolicy Bypass -NoProfile -WindowStyle Hidden -File "C:\Temp\ps_cFE4azdaERkV_1785745529971.ps1"
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious use of SetThreadContext
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2944
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:4604
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:6068
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:3432
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:760
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:5892
- - 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:4388
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:5884
- - 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:2276
- - 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:2772
- - 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:5852
- - 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:3484
- - 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:1408
- C:\Windows\SysWOW64\mcbuilder.exe
  "C:\Windows\SysWOW64\mcbuilder.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: MapViewOfSection
  PID:4720
- C:\Windows\System32\taskkill.exe
  "C:\Windows\System32\taskkill.exe" /f /im wscript.exe
  2⤵
  - Kills process with taskkill
  - Suspicious use of AdjustPrivilegeToken
  PID:1816

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_cFE4azdaERkV_1785745529971.ps1

Path C:\Temp\ps_cFE4azdaERkV_1785745529971.ps1
Size 2.1MB
SHA256 6b8dee9a582703aed5800f5bd8d1b0362f58ee80746b7f6be88cccb8534fd0e6
MD5 2ed1eb979cee83641420c538f4fdaa29
SHA1 16825edd046380b9fc6335ac9e0676aa3e52cfb8
SHA512 1f3b104d642edb6da833d83e384abc84080f7aba0a1fec4b64d46dd0bde7703483367990204004e6fbfcaeee07c0e832e51ef8a76fecd20e18f980d23282bf69
SSDEEP 24576:Qt88iK13t5aofomKz14m7qdCYli5M4wwCO7t4K+BBVxjBVQASoLUxkjpsPOowS:P
TLSH
T1FEA5BFCAD16E44D29C053FC998242AC78B2586328A7400283A7F7D499F775FFC15EEE6
MD5 SHA1 SHA512 SSDEEP TLSH

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memory/2944-14-0x00007FFC122D0000-0x00007FFC12C74000-memory.dmp

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memory/2944-15-0x00007FFC122D0000-0x00007FFC12C74000-memory.dmp

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memory/2944-6-0x00007FFC122D0000-0x00007FFC12C74000-memory.dmp

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memory/2944-7-0x00007FFC122D0000-0x00007FFC12C74000-memory.dmp

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memory/2944-2-0x00007FFC122D0000-0x00007FFC12C74000-memory.dmp

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memory/2944-9-0x00007FFC122D0000-0x00007FFC12C74000-memory.dmp

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memory/2944-10-0x00007FFC122D0000-0x00007FFC12C74000-memory.dmp

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memory/2944-11-0x00007FFC122D0000-0x00007FFC12C74000-memory.dmp

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memory/2944-12-0x00007FFC122D0000-0x00007FFC12C74000-memory.dmp

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memory/2944-26-0x00007FFC122D0000-0x00007FFC12C74000-memory.dmp

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memory/2944-5-0x00000282BDA50000-0x00000282BDA72000-memory.dmp

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memory/2944-16-0x00007FFC122D0000-0x00007FFC12C74000-memory.dmp

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memory/2944-13-0x00007FFC122D0000-0x00007FFC12C74000-memory.dmp

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memory/2944-17-0x00007FFC122D0000-0x00007FFC12C74000-memory.dmp

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memory/2944-18-0x00007FFC122D0000-0x00007FFC12C74000-memory.dmp

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memory/2944-19-0x00007FFC122D0000-0x00007FFC12C74000-memory.dmp

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memory/2944-20-0x00000282BDA80000-0x00000282BDA8C000-memory.dmp

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memory/2944-1-0x00007FFC1245F000-0x00007FFC12460000-memory.dmp

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memory/2944-22-0x00007FFC122D0000-0x00007FFC12C74000-memory.dmp

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memory/2944-45-0x00007FFC122D0000-0x00007FFC12C74000-memory.dmp

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memory/2944-24-0x00007FFC122D0000-0x00007FFC12C74000-memory.dmp

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memory/4388-21-0x0000000000400000-0x0000000000447000-memory.dmp

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memory/4388-32-0x0000000001470000-0x00000000014B7000-memory.dmp

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memory/4388-28-0x0000000001470000-0x00000000014B7000-memory.dmp

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memory/4388-30-0x0000000001800000-0x0000000001824000-memory.dmp

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memory/4388-29-0x0000000001470000-0x00000000014B7000-memory.dmp

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memory/4388-25-0x0000000001470000-0x00000000014B7000-memory.dmp

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memory/4388-35-0x0000000001800000-0x0000000001824000-memory.dmp

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memory/4388-27-0x0000000001840000-0x0000000001BB4000-memory.dmp

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memory/4388-34-0x0000000001470000-0x00000000014B7000-memory.dmp

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memory/4720-33-0x0000000000970000-0x00000000009B4000-memory.dmp

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memory/4720-36-0x0000000001520000-0x0000000001894000-memory.dmp

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memory/4720-37-0x0000000000970000-0x00000000009B4000-memory.dmp

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memory/4720-41-0x0000000000970000-0x00000000009B4000-memory.dmp

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memory/4720-31-0x0000000000970000-0x00000000009B4000-memory.dmp

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memory/5976-39-0x000002DECC270000-0x000002DECC361000-memory.dmp

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memory/5976-46-0x000002DECC270000-0x000002DECC361000-memory.dmp

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