formbook | b9a3499ffd979b0fb70199be7ce2f4bd2a93b42ca09408cf371cdbee29695707

Analysis

max time kernel
148s
max time network
137s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260706-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260706-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
07/07/2026, 14:16

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General

Target
b9a3499ffd979b0fb70199be7ce2f4bd2a93b42ca09408cf371cdbee29695707.exe
Size 1.0MB
Sample260707-rlccfsbv5v
SHA256 b9a3499ffd979b0fb70199be7ce2f4bd2a93b42ca09408cf371cdbee29695707
MD5 1af230019baadb202a6410555a2e6d68
SHA1 c235c2ff6399fb47fa21a2e65a08cdc077c746c0
SHA512 3181f246ed69ca4b322a27e9982e020aba5a191a32960940fcc1c3bb1855db7c5e2e299d5b945571483378e138ae481df119fbc7527e8d69894325f6f04d2965
SSDEEP 24576:1r+Q/gd/1lXnX13TskyJ38wkGCOKHk+DOPsa44SZ:J+4gd/1lH13Ts7hkGCO3IO
TLSH
T1713512A81B66EA07C9590B782EB1F17816BC2FDEB411D2195FD9BDEBB936F010C04253
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
behavioral2/memory/1808-19-0x0000000000AC0000-0x0000000000B06000-memory.dmp	family_formbook
behavioral2/memory/1808-35-0x0000000000AC0000-0x0000000000B06000-memory.dmp	family_formbook

Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
4944	powershell.exe
4800	powershell.exe
2612	powershell.exe

Executes dropped EXE 2 IoCs

pid	Process
3000	EujcYLVIs.exe
3540	EujcYLVIs.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2626306573-1585762579-411806764-1000\Software\Microsoft\Windows\CurrentVersion\Run\EujcYLVIs = "\"C:\\Windows\\system32\\WindowsPowerShell\\v1.0\\powershell.exe\" -NoProfile -ExecutionPolicy Bypass -WindowStyle Hidden -File \"C:\\Users\\Admin\\AppData\\Local\\Temp\\yleu5v4qmds.ps1\""	b9a3499ffd979b0fb70199be7ce2f4bd2a93b42ca09408cf371cdbee29695707.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 3596 set thread context of 1808	3596	b9a3499ffd979b0fb70199be7ce2f4bd2a93b42ca09408cf371cdbee29695707.exe	91
PID 3000 set thread context of 3540	3000	EujcYLVIs.exe	101

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

System Information Discovery
T1082

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2704	1808	WerFault.exe	91

System Location Discovery: System Language Discovery 1 TTPs 4 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	b9a3499ffd979b0fb70199be7ce2f4bd2a93b42ca09408cf371cdbee29695707.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	EujcYLVIs.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe

Suspicious behavior: EnumeratesProcesses 14 IoCs

pid	Process
4944	powershell.exe
1808	b9a3499ffd979b0fb70199be7ce2f4bd2a93b42ca09408cf371cdbee29695707.exe
2612	powershell.exe
4944	powershell.exe
2612	powershell.exe
3540	EujcYLVIs.exe
4800	powershell.exe
3540	EujcYLVIs.exe
3540	EujcYLVIs.exe
4800	powershell.exe
3540	EujcYLVIs.exe
3540	EujcYLVIs.exe
3540	EujcYLVIs.exe
3540	EujcYLVIs.exe

Suspicious use of AdjustPrivilegeToken 45 IoCs

description	pid	Process
Token: SeDebugPrivilege	4944	powershell.exe
Token: SeDebugPrivilege	2612	powershell.exe
Token: SeIncreaseQuotaPrivilege	4944	powershell.exe
Token: SeSecurityPrivilege	4944	powershell.exe
Token: SeTakeOwnershipPrivilege	4944	powershell.exe
Token: SeLoadDriverPrivilege	4944	powershell.exe
Token: SeSystemProfilePrivilege	4944	powershell.exe
Token: SeSystemtimePrivilege	4944	powershell.exe
Token: SeProfSingleProcessPrivilege	4944	powershell.exe
Token: SeIncBasePriorityPrivilege	4944	powershell.exe
Token: SeCreatePagefilePrivilege	4944	powershell.exe
Token: SeBackupPrivilege	4944	powershell.exe
Token: SeRestorePrivilege	4944	powershell.exe
Token: SeShutdownPrivilege	4944	powershell.exe
Token: SeDebugPrivilege	4944	powershell.exe
Token: SeSystemEnvironmentPrivilege	4944	powershell.exe
Token: SeRemoteShutdownPrivilege	4944	powershell.exe
Token: SeUndockPrivilege	4944	powershell.exe
Token: SeManageVolumePrivilege	4944	powershell.exe
Token: 33	4944	powershell.exe
Token: 34	4944	powershell.exe
Token: 35	4944	powershell.exe
Token: 36	4944	powershell.exe
Token: SeDebugPrivilege	4800	powershell.exe
Token: SeIncreaseQuotaPrivilege	4800	powershell.exe
Token: SeSecurityPrivilege	4800	powershell.exe
Token: SeTakeOwnershipPrivilege	4800	powershell.exe
Token: SeLoadDriverPrivilege	4800	powershell.exe
Token: SeSystemProfilePrivilege	4800	powershell.exe
Token: SeSystemtimePrivilege	4800	powershell.exe
Token: SeProfSingleProcessPrivilege	4800	powershell.exe
Token: SeIncBasePriorityPrivilege	4800	powershell.exe
Token: SeCreatePagefilePrivilege	4800	powershell.exe
Token: SeBackupPrivilege	4800	powershell.exe
Token: SeRestorePrivilege	4800	powershell.exe
Token: SeShutdownPrivilege	4800	powershell.exe
Token: SeDebugPrivilege	4800	powershell.exe
Token: SeSystemEnvironmentPrivilege	4800	powershell.exe
Token: SeRemoteShutdownPrivilege	4800	powershell.exe
Token: SeUndockPrivilege	4800	powershell.exe
Token: SeManageVolumePrivilege	4800	powershell.exe
Token: 33	4800	powershell.exe
Token: 34	4800	powershell.exe
Token: 35	4800	powershell.exe
Token: 36	4800	powershell.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 3596 wrote to memory of 4944	3596	b9a3499ffd979b0fb70199be7ce2f4bd2a93b42ca09408cf371cdbee29695707.exe	88
PID 3596 wrote to memory of 1808	3596	b9a3499ffd979b0fb70199be7ce2f4bd2a93b42ca09408cf371cdbee29695707.exe	91
PID 3596 wrote to memory of 1808	3596	b9a3499ffd979b0fb70199be7ce2f4bd2a93b42ca09408cf371cdbee29695707.exe	91
PID 3596 wrote to memory of 1808	3596	b9a3499ffd979b0fb70199be7ce2f4bd2a93b42ca09408cf371cdbee29695707.exe	91
PID 2612 wrote to memory of 3000	2612	powershell.exe	96
PID 3000 wrote to memory of 4800	3000	EujcYLVIs.exe	99
PID 3000 wrote to memory of 3540	3000	EujcYLVIs.exe	101
PID 3000 wrote to memory of 3540	3000	EujcYLVIs.exe	101
PID 3000 wrote to memory of 3540	3000	EujcYLVIs.exe	101

C:\Users\Admin\AppData\Local\Temp\b9a3499ffd979b0fb70199be7ce2f4bd2a93b42ca09408cf371cdbee29695707.exe
"C:\Users\Admin\AppData\Local\Temp\b9a3499ffd979b0fb70199be7ce2f4bd2a93b42ca09408cf371cdbee29695707.exe"
1⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3596
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Local\Temp\b9a3499ffd979b0fb70199be7ce2f4bd2a93b42ca09408cf371cdbee29695707.exe"
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4944
- C:\Users\Admin\AppData\Local\Temp\b9a3499ffd979b0fb70199be7ce2f4bd2a93b42ca09408cf371cdbee29695707.exe
  "C:\Users\Admin\AppData\Local\Temp\b9a3499ffd979b0fb70199be7ce2f4bd2a93b42ca09408cf371cdbee29695707.exe"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  PID:1808
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 1808 -s 228
    3⤵
    - Program crash
    PID:2704

C:\Windows\system32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\system32\WindowsPowerShell\v1.0\powershell.exe" -NoProfile -ExecutionPolicy Bypass -WindowStyle Hidden -File "C:\Users\Admin\AppData\Local\Temp\yleu5v4qmds.ps1"
1⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2612
- C:\Users\Admin\AppData\Roaming\EujcYLVIs.exe
  "C:\Users\Admin\AppData\Roaming\EujcYLVIs.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3000
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\EujcYLVIs.exe"
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4800
- - C:\Users\Admin\AppData\Roaming\EujcYLVIs.exe
    "C:\Users\Admin\AppData\Roaming\EujcYLVIs.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    PID:3540

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 392 -p 1808 -ip 1808
1⤵
PID:6128

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

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

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Downloads

StartupProfileData-NonInteractive

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Size 21KB
SHA256 5237b00587bcd6a9b74abf446fdd560bf6ad5b60a7d3a0098e2ead9f845040c6
MD5 581efbf426802428c2723a4fbe813710
SHA1 910d57ba130b14245c5ee4801714b570081fdcc9
SHA512 6bd0737a0aa90d73979bf8befb80b7f257a153ba7d79981a1659cceb8998dd357369f1d1b6b2b456b8600e94338233ed509d8dc22bbcad61b5ffd6aa15ec8e5e
SSDEEP 384:/1eBaoT1iBGmGW14beBzhv9+geCRFOJr2PouZIAXr4B+BWIvuzKwYvYbhNaPMlRs:dexZ6GlWi6Fhv9+aE6ggIAXrq+Lq3bhk
TLSH
T184A2C578213F6DC7D8D226B410D10AF7FBE4D489DAB611D4BF1BDA2F4C90EB64AA0524
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

__PSScriptPolicyTest_btkjek11.qef.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_btkjek11.qef.ps1
Size 60B
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
TLSH
T177A02228CC303B200020C0080A000002C00B800C080C8C0220000A00B20B820002F080
MD5 SHA1 SHA512 TLSH

Submit Download

yleu5v4qmds.ps1

Path C:\Users\Admin\AppData\Local\Temp\yleu5v4qmds.ps1
Size 1KB
SHA256 26991a418a39efd143b222ae350fe0722b643976153ca32bdb3bf1ac89ac29b7
MD5 f96ab9c19fbc1437aaeaf1bf91fa3ee7
SHA1 22564d8b51d6a5c5cb95436f17efe41ebe6961f2
SHA512 848c0d05c4c129c5549ddf8a1dbad0543dd9009a8e969efb511048e4567af4ccd513b7e4e873360ff49e48dcd5b1e44d4f7a8474476b07857d92ec19b259cbc2
TLSH
T1E511230B8E844BC6406403F0561375CCB52E62CB6B7F019095ECB4EEB32BE23346ACE4
MD5 SHA1 SHA512 TLSH

Submit Download

EujcYLVIs.exe

Path C:\Users\Admin\AppData\Roaming\EujcYLVIs.exe
Size 1.0MB
SHA256 b9a3499ffd979b0fb70199be7ce2f4bd2a93b42ca09408cf371cdbee29695707
MD5 1af230019baadb202a6410555a2e6d68
SHA1 c235c2ff6399fb47fa21a2e65a08cdc077c746c0
SHA512 3181f246ed69ca4b322a27e9982e020aba5a191a32960940fcc1c3bb1855db7c5e2e299d5b945571483378e138ae481df119fbc7527e8d69894325f6f04d2965
SSDEEP 24576:1r+Q/gd/1lXnX13TskyJ38wkGCOKHk+DOPsa44SZ:J+4gd/1lH13Ts7hkGCO3IO
TLSH
T1713512A81B66EA07C9590B782EB1F17816BC2FDEB411D2195FD9BDEBB936F010C04253
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1808-18-0x0000000000400000-0x0000000000446000-memory.dmp

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memory/1808-35-0x0000000000AC0000-0x0000000000B06000-memory.dmp

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memory/1808-26-0x0000000001180000-0x00000000014F4000-memory.dmp

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memory/1808-19-0x0000000000AC0000-0x0000000000B06000-memory.dmp

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memory/2612-29-0x0000014F9C6C0000-0x0000014F9C6E2000-memory.dmp

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memory/3596-25-0x00000000743E0000-0x0000000074B9C000-memory.dmp

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memory/3596-0-0x00000000743F2000-0x00000000743F3000-memory.dmp

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memory/3596-11-0x0000000009910000-0x00000000099AC000-memory.dmp

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memory/3596-5-0x00000000743E0000-0x0000000074B9C000-memory.dmp

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memory/3596-6-0x0000000008E20000-0x0000000008E40000-memory.dmp

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memory/3596-7-0x0000000008E40000-0x000000000919B000-memory.dmp

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memory/3596-10-0x0000000009790000-0x000000000986E000-memory.dmp

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memory/3596-1-0x0000000000620000-0x000000000072E000-memory.dmp

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memory/3596-9-0x00000000743E0000-0x0000000074B9C000-memory.dmp

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memory/3596-8-0x00000000743F2000-0x00000000743F3000-memory.dmp

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memory/3596-2-0x0000000005780000-0x0000000005D3A000-memory.dmp

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memory/3596-3-0x0000000005260000-0x00000000052F2000-memory.dmp

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memory/3596-4-0x0000000005300000-0x000000000530A000-memory.dmp

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memory/4800-53-0x00000000064E0000-0x000000000683B000-memory.dmp

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memory/4800-55-0x0000000006AC0000-0x0000000006B0C000-memory.dmp

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memory/4800-56-0x00000000706C0000-0x000000007070C000-memory.dmp

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memory/4800-59-0x0000000007CA0000-0x0000000007D43000-memory.dmp

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memory/4944-31-0x0000000005F40000-0x0000000005F8C000-memory.dmp

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memory/4944-43-0x00000000071B0000-0x00000000071CA000-memory.dmp

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memory/4944-20-0x00000000056B0000-0x00000000056D2000-memory.dmp

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memory/4944-21-0x0000000005750000-0x00000000057B6000-memory.dmp

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memory/4944-36-0x0000000006420000-0x0000000006456000-memory.dmp

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memory/4944-22-0x00000000058F0000-0x0000000005956000-memory.dmp

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memory/4944-40-0x0000000006400000-0x0000000006420000-memory.dmp

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memory/4944-37-0x0000000074CA0000-0x0000000074CEC000-memory.dmp

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memory/4944-41-0x0000000007050000-0x00000000070F3000-memory.dmp

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memory/4944-30-0x0000000005E50000-0x0000000005E6E000-memory.dmp

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memory/4944-42-0x00000000077F0000-0x0000000007E6C000-memory.dmp

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memory/4944-44-0x0000000007220000-0x000000000722A000-memory.dmp

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memory/4944-45-0x0000000007420000-0x00000000074B6000-memory.dmp

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memory/4944-17-0x00000000743E0000-0x0000000074B9C000-memory.dmp

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memory/4944-48-0x00000000743E0000-0x0000000074B9C000-memory.dmp

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memory/4944-16-0x0000000005060000-0x00000000056AA000-memory.dmp

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memory/4944-15-0x00000000743E0000-0x0000000074B9C000-memory.dmp

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memory/4944-14-0x00000000743E0000-0x0000000074B9C000-memory.dmp

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memory/4944-13-0x0000000002600000-0x0000000002636000-memory.dmp

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