formbook | 362dffc9bf195a6c9902d96a61ee68b00b2ec9560e55db113fb43050949bcf97

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, 12:35

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General

Target
tmpacqudtw0.js
Size 1.9MB
Sample260602-psdsraew2k
SHA256 362dffc9bf195a6c9902d96a61ee68b00b2ec9560e55db113fb43050949bcf97
MD5 19d8b061925ef7f52595b73af67069f8
SHA1 202e708db8d4a92281a5a9ce7e6edb5f63f81208
SHA512 c5e47324a9df29d6d006319a8625a7b1f59ebadc616560e3dd3e2780f8046868baedc3697eb48db152b7b8a69b17542159dda82a13d19df69ff1813c21111044
SSDEEP 24576:v8IJ9ZZPMQP/hqr3k/gd1cHFMjCTCWJVf6DuLOfVA5XhMsulIu2cAq:0IJBP/hHBxANb2q
TLSH
T12295F1118AC42FA8CF9C561D90BE150EB3F14D8E5416B98AEB73BD4AEFF7A00511B19C
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/3860-18-0x00000000013F0000-0x0000000001436000-memory.dmp	family_formbook
behavioral3/memory/3860-21-0x00000000013F0000-0x0000000001436000-memory.dmp	family_formbook
behavioral3/memory/3860-22-0x00000000013F0000-0x0000000001436000-memory.dmp	family_formbook
behavioral3/memory/3860-29-0x00000000013F0000-0x0000000001436000-memory.dmp	family_formbook
behavioral3/memory/1280-31-0x0000000000E40000-0x0000000000E83000-memory.dmp	family_formbook
behavioral3/memory/1280-35-0x0000000000E40000-0x0000000000E83000-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	2576	wscript.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
2872	powershell.exe

ConfuserEx .NET packer 3 IoCs

Detects ConfuserEx .NET packer.

resource	yara_rule
behavioral3/memory/2872-12-0x0000015AE37F0000-0x0000015AE3802000-memory.dmp	ConfuserEx
behavioral3/memory/2872-14-0x0000015AFF570000-0x0000015AFF582000-memory.dmp	ConfuserEx
behavioral3/memory/2872-41-0x0000015AFF650000-0x0000015AFF662000-memory.dmp	ConfuserEx

Suspicious use of SetThreadContext 11 IoCs

description	pid	Process	procid_target
PID 2872 set thread context of 3860	2872	powershell.exe	88
PID 3860 set thread context of 2576	3860	aspnet_compiler.exe	80
PID 3860 set thread context of 1280	3860	aspnet_compiler.exe	89
PID 2872 set thread context of 2120	2872	powershell.exe	90
PID 1280 set thread context of 2576	1280	msfeedssync.exe	80
PID 2872 set thread context of 4472	2872	powershell.exe	94
PID 2872 set thread context of 2684	2872	powershell.exe	95
PID 2872 set thread context of 2528	2872	powershell.exe	96
PID 2872 set thread context of 1440	2872	powershell.exe	97
PID 2872 set thread context of 4712	2872	powershell.exe	99
PID 2872 set thread context of 1768	2872	powershell.exe	100

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	msfeedssync.exe

Kills process with taskkill 1 IoCs

defense_evasion

pid	Process
3848	taskkill.exe

Suspicious behavior: EnumeratesProcesses 45 IoCs

pid	Process
2872	powershell.exe
2872	powershell.exe
2872	powershell.exe
2872	powershell.exe
2872	powershell.exe
2872	powershell.exe
2872	powershell.exe
2872	powershell.exe
2872	powershell.exe
2872	powershell.exe
2872	powershell.exe
2872	powershell.exe
2872	powershell.exe
2872	powershell.exe
3860	aspnet_compiler.exe
3860	aspnet_compiler.exe
3860	aspnet_compiler.exe
3860	aspnet_compiler.exe
2872	powershell.exe
1280	msfeedssync.exe
1280	msfeedssync.exe
1280	msfeedssync.exe
1280	msfeedssync.exe
2872	powershell.exe
2120	aspnet_compiler.exe
2872	powershell.exe
2872	powershell.exe
2872	powershell.exe
2872	powershell.exe
2872	powershell.exe
2872	powershell.exe
2872	powershell.exe
4472	aspnet_compiler.exe
2872	powershell.exe
2684	aspnet_compiler.exe
2872	powershell.exe
2528	aspnet_compiler.exe
2872	powershell.exe
1440	aspnet_compiler.exe
2872	powershell.exe
2872	powershell.exe
2872	powershell.exe
4712	aspnet_compiler.exe
2872	powershell.exe
1768	aspnet_compiler.exe

Suspicious behavior: MapViewOfSection 5 IoCs

pid	Process
3860	aspnet_compiler.exe
2576	wscript.exe
2576	wscript.exe
1280	msfeedssync.exe
1280	msfeedssync.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2872	powershell.exe
Token: SeDebugPrivilege	3848	taskkill.exe

Suspicious use of WriteProcessMemory 36 IoCs

description	pid	Process	procid_target
PID 2576 wrote to memory of 2872	2576	wscript.exe	81
PID 2872 wrote to memory of 3252	2872	powershell.exe	83
PID 2872 wrote to memory of 3348	2872	powershell.exe	84
PID 2872 wrote to memory of 3392	2872	powershell.exe	85
PID 2872 wrote to memory of 1304	2872	powershell.exe	86
PID 2872 wrote to memory of 2540	2872	powershell.exe	87
PID 2872 wrote to memory of 3860	2872	powershell.exe	88
PID 2872 wrote to memory of 3860	2872	powershell.exe	88
PID 2872 wrote to memory of 3860	2872	powershell.exe	88
PID 2576 wrote to memory of 1280	2576	wscript.exe	89
PID 2872 wrote to memory of 2120	2872	powershell.exe	90
PID 2872 wrote to memory of 2120	2872	powershell.exe	90
PID 2872 wrote to memory of 2120	2872	powershell.exe	90
PID 2872 wrote to memory of 4616	2872	powershell.exe	91
PID 2872 wrote to memory of 3268	2872	powershell.exe	92
PID 2872 wrote to memory of 660	2872	powershell.exe	93
PID 2872 wrote to memory of 4472	2872	powershell.exe	94
PID 2872 wrote to memory of 4472	2872	powershell.exe	94
PID 2872 wrote to memory of 4472	2872	powershell.exe	94
PID 2872 wrote to memory of 2684	2872	powershell.exe	95
PID 2872 wrote to memory of 2684	2872	powershell.exe	95
PID 2872 wrote to memory of 2684	2872	powershell.exe	95
PID 2872 wrote to memory of 2528	2872	powershell.exe	96
PID 2872 wrote to memory of 2528	2872	powershell.exe	96
PID 2872 wrote to memory of 2528	2872	powershell.exe	96
PID 2872 wrote to memory of 1440	2872	powershell.exe	97
PID 2872 wrote to memory of 1440	2872	powershell.exe	97
PID 2872 wrote to memory of 1440	2872	powershell.exe	97
PID 2872 wrote to memory of 2504	2872	powershell.exe	98
PID 2872 wrote to memory of 4712	2872	powershell.exe	99
PID 2872 wrote to memory of 4712	2872	powershell.exe	99
PID 2872 wrote to memory of 4712	2872	powershell.exe	99
PID 2872 wrote to memory of 1768	2872	powershell.exe	100
PID 2872 wrote to memory of 1768	2872	powershell.exe	100
PID 2872 wrote to memory of 1768	2872	powershell.exe	100
PID 2576 wrote to memory of 3848	2576	wscript.exe	102

C:\Windows\system32\wscript.exe
wscript.exe C:\Users\Admin\AppData\Local\Temp\tmpacqudtw0.js
1⤵
- Badlisted process makes network request
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:2576
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  powershell.exe -ExecutionPolicy Bypass -NoProfile -WindowStyle Hidden -File "C:\Temp\ps_gfvVrY4l0wWg_1780403716325.ps1"
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious use of SetThreadContext
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2872
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:3252
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:3348
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:3392
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:1304
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    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 use of SetThreadContext
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious behavior: MapViewOfSection
    PID:3860
- - 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:2120
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:4616
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:3268
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:660
- - 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:4472
- - 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:2684
- - 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:2528
- - 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:1440
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
    3⤵
    PID:2504
- - 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:4712
- - 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:1768
- C:\Windows\SysWOW64\msfeedssync.exe
  "C:\Windows\SysWOW64\msfeedssync.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: MapViewOfSection
  PID:1280
- C:\Windows\System32\taskkill.exe
  "C:\Windows\System32\taskkill.exe" /f /im wscript.exe
  2⤵
  - Kills process with taskkill
  - Suspicious use of AdjustPrivilegeToken
  PID:3848

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_gfvVrY4l0wWg_1780403716325.ps1

Path C:\Temp\ps_gfvVrY4l0wWg_1780403716325.ps1
Size 1.4MB
SHA256 bde5807971f08dab9b6f306b030f19cebdf933428d4e3fce600b98aa7741693f
MD5 fcdb1dada1ff275c2bf11bdd8ffc3ed5
SHA1 882f61ff3d67980f3d838a45fc66b47fac2ecbfa
SHA512 24e702a69e6e84d51eb56b67e7a44e9cf6b311daef13658cd1fbf980d31a8d7e12f38948616b6af0760848f37b0007d8504c61379bc15c948db0a4a3ef8d3e2c
SSDEEP 24576:C4d3r+BVT00/EBMW4zKLCCFYf4WhR10O+wX9/GAvy/fR0Ay9I9nioj:CytwRf4WZjtwSu9f
TLSH
T1E2653390FDF53F7F9244423DE1B75E6C23A24EFA80A4948E4E9814E21A5735AC336C6D
MD5 SHA1 SHA512 SSDEEP TLSH

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__PSScriptPolicyTest_uw0c10kk.ll1.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_uw0c10kk.ll1.ps1
Size 60B
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
TLSH
T177A02228CC303B200020C0080A000002C00B800C080C8C0220000A00B20B820002F080
MD5 SHA1 SHA512 TLSH

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memory/1280-35-0x0000000000E40000-0x0000000000E83000-memory.dmp

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memory/1280-31-0x0000000000E40000-0x0000000000E83000-memory.dmp

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memory/1280-30-0x00000000016E0000-0x0000000001A36000-memory.dmp

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memory/1280-26-0x0000000000E40000-0x0000000000E83000-memory.dmp

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memory/1280-25-0x0000000000E40000-0x0000000000E83000-memory.dmp

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memory/2576-24-0x0000000000A70000-0x0000000000FA3000-memory.dmp

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memory/2576-43-0x0000020F951D0000-0x0000020F952E4000-memory.dmp

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memory/2576-34-0x0000020F951D0000-0x0000020F952E4000-memory.dmp

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memory/2576-32-0x0000000000A70000-0x0000000000FA3000-memory.dmp

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memory/2872-13-0x0000015AE3860000-0x0000015AE3866000-memory.dmp

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memory/2872-14-0x0000015AFF570000-0x0000015AFF582000-memory.dmp

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memory/2872-19-0x0000015AFD370000-0x0000015AFD380000-memory.dmp

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memory/2872-1-0x0000015AFD370000-0x0000015AFD380000-memory.dmp

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memory/2872-41-0x0000015AFF650000-0x0000015AFF662000-memory.dmp

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memory/2872-16-0x0000015AFD370000-0x0000015AFD380000-memory.dmp

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memory/2872-9-0x0000015AFD340000-0x0000015AFD362000-memory.dmp

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memory/2872-10-0x0000015AFD370000-0x0000015AFD380000-memory.dmp

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memory/2872-17-0x0000015AFD370000-0x0000015AFD380000-memory.dmp

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memory/2872-12-0x0000015AE37F0000-0x0000015AE3802000-memory.dmp

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memory/2872-2-0x0000015AFD370000-0x0000015AFD380000-memory.dmp

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memory/3860-22-0x00000000013F0000-0x0000000001436000-memory.dmp

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memory/3860-29-0x00000000013F0000-0x0000000001436000-memory.dmp

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memory/3860-15-0x0000000000400000-0x0000000000446000-memory.dmp

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memory/3860-27-0x00000000013F0000-0x0000000001436000-memory.dmp

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memory/3860-18-0x00000000013F0000-0x0000000001436000-memory.dmp

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memory/3860-23-0x0000000001CE0000-0x0000000001D04000-memory.dmp

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memory/3860-21-0x00000000013F0000-0x0000000001436000-memory.dmp

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memory/3860-20-0x00000000018F0000-0x0000000001C46000-memory.dmp

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