formbook | fdcd11dcd6a96d4ddfefaef7a186277e84c147fa7e33c0994b2deb384e8d0487

Analysis

max time kernel
146s
max time network
148s
platform
windows10-2004_x64
resource
win10v2004-20250314-en
resource tags

arch:x64arch:x86image:win10v2004-20250314-enlocale:en-usos:windows10-2004-x64system
submitted
25/03/2025, 21:10

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General

Target

vstdlib_s64.dll
Size

10.0MB
MD5

897e2193493cfd989d82f6a559bf1b2a
SHA1

df837bc19bf863ce466588ca3121fed884922b90
SHA256

92958c2e2d940de78a7f5352b00890f291d568816a8fe1b2bf8c572941644ec0
SHA512

761d12c8ebf7df3bbdc7cddf1220065a4e13780057c99b2e43bd653f1c00154ad9e1c8f2236373d54c985ee710c8847813223d244ad170c678593b3ce8e97996
SSDEEP

98304:nt/DDvVWLvBmmZCPPSVHxySAknm58mQzKSawKlhW1TS28kvGGp:t1WLvBzCSVHxySAknm58mHw6hKVGGp

Score

10^/10

formbook gt23 discovery rat spyware stealer trojan

Malware Config

Extracted

Family

formbook

Version

4.1

Campaign

gt23

Decoy

awkeyesunspotsunfire.top

valbardrc.store

idadari29nice.makeup

haymu.shop

hybf2025.sbs

obbiny.xyz

dlecore.xyz

rabbeat.live

irelily.vip

oahnyn.shop

om-massfadq.top

lizalyn.work

irlo.shop

hostsolver.store

ylastpics.info

adfgt.xyz

cis.club

iskol.fun

riceflashradarlab.xyz

enovhojecnhi.shop

Signatures

Formbook
Formbook is a data stealing malware which is capable of stealing data.
trojan spyware stealer formbook
Formbook family
formbook

Formbook payload 4 IoCs

rat

resource	yara_rule
behavioral6/memory/716-0-0x0000000000400000-0x000000000042F000-memory.dmp	formbook
behavioral6/memory/716-3-0x0000000000400000-0x000000000042F000-memory.dmp	formbook
behavioral6/memory/5988-11-0x0000000000500000-0x000000000052F000-memory.dmp	formbook
behavioral6/memory/5988-13-0x0000000000500000-0x000000000052F000-memory.dmp	formbook

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 3272 set thread context of 716	3272	rundll32.exe	87
PID 716 set thread context of 3508	716	aspnet_wp.exe	56
PID 5988 set thread context of 3508	5988	msiexec.exe	56

System Location Discovery: System Language Discovery 1 TTPs 2 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	msiexec.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Modifies registry class 2 IoCs

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\CLSID\{4336a54d-038b-4685-ab02-99bb52d3fb8b}\Instance\	Explorer.EXE
Key created	\REGISTRY\USER\S-1-5-21-3975168204-1612096350-4002976354-1000_Classes\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\Instance\	Explorer.EXE

Suspicious behavior: EnumeratesProcesses 62 IoCs

pid	Process
716	aspnet_wp.exe
716	aspnet_wp.exe
716	aspnet_wp.exe
716	aspnet_wp.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe
5988	msiexec.exe

Suspicious behavior: MapViewOfSection 5 IoCs

pid	Process
716	aspnet_wp.exe
716	aspnet_wp.exe
716	aspnet_wp.exe
5988	msiexec.exe
5988	msiexec.exe

Suspicious use of AdjustPrivilegeToken 11 IoCs

description	pid	Process
Token: SeDebugPrivilege	3272	rundll32.exe
Token: SeDebugPrivilege	716	aspnet_wp.exe
Token: SeDebugPrivilege	5988	msiexec.exe
Token: SeShutdownPrivilege	3508	Explorer.EXE
Token: SeCreatePagefilePrivilege	3508	Explorer.EXE
Token: SeShutdownPrivilege	3508	Explorer.EXE
Token: SeCreatePagefilePrivilege	3508	Explorer.EXE
Token: SeShutdownPrivilege	3508	Explorer.EXE
Token: SeCreatePagefilePrivilege	3508	Explorer.EXE
Token: SeShutdownPrivilege	3508	Explorer.EXE
Token: SeCreatePagefilePrivilege	3508	Explorer.EXE

Suspicious use of UnmapMainImage 1 IoCs

pid	Process
3508	Explorer.EXE

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 3272 wrote to memory of 716	3272	rundll32.exe	87
PID 3272 wrote to memory of 716	3272	rundll32.exe	87
PID 3272 wrote to memory of 716	3272	rundll32.exe	87
PID 3272 wrote to memory of 716	3272	rundll32.exe	87
PID 3272 wrote to memory of 716	3272	rundll32.exe	87
PID 3272 wrote to memory of 716	3272	rundll32.exe	87
PID 3508 wrote to memory of 5988	3508	Explorer.EXE	91
PID 3508 wrote to memory of 5988	3508	Explorer.EXE	91
PID 3508 wrote to memory of 5988	3508	Explorer.EXE	91
PID 5988 wrote to memory of 2368	5988	msiexec.exe	94
PID 5988 wrote to memory of 2368	5988	msiexec.exe	94
PID 5988 wrote to memory of 2368	5988	msiexec.exe	94

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Modifies registry class
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of UnmapMainImage
- Suspicious use of WriteProcessMemory
PID:3508
- C:\Windows\system32\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\vstdlib_s64.dll,#1
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3272
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_wp.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_wp.exe"
    3⤵
    - Suspicious use of SetThreadContext
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious behavior: MapViewOfSection
    - Suspicious use of AdjustPrivilegeToken
    PID:716
- C:\Windows\SysWOW64\msiexec.exe
  "C:\Windows\SysWOW64\msiexec.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:5988
- - C:\Windows\SysWOW64\cmd.exe
    /c del "C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_wp.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:2368

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/716-1-0x00000000015C0000-0x000000000190A000-memory.dmp

Filesize
3.3MB

Download
memory/716-3-0x0000000000400000-0x000000000042F000-memory.dmp

Filesize
188KB

Download
memory/716-4-0x00000000012B0000-0x00000000012C5000-memory.dmp

Filesize
84KB

Download
memory/716-0-0x0000000000400000-0x000000000042F000-memory.dmp

Filesize
188KB

Download
memory/3508-14-0x0000000008160000-0x0000000008273000-memory.dmp

Filesize
1.1MB

Download
memory/3508-5-0x0000000008160000-0x0000000008273000-memory.dmp

Filesize
1.1MB

Download
memory/3508-22-0x0000000008350000-0x0000000008465000-memory.dmp

Filesize
1.1MB

Download
memory/3508-20-0x0000000008350000-0x0000000008465000-memory.dmp

Filesize
1.1MB

Download
memory/3508-19-0x0000000008350000-0x0000000008465000-memory.dmp

Filesize
1.1MB

Download
memory/5988-11-0x0000000000500000-0x000000000052F000-memory.dmp

Filesize
188KB

Download
memory/5988-13-0x0000000000500000-0x000000000052F000-memory.dmp

Filesize
188KB

Download
memory/5988-12-0x00000000023B0000-0x00000000026FA000-memory.dmp

Filesize
3.3MB

Download
memory/5988-15-0x0000000002210000-0x00000000022A4000-memory.dmp

Filesize
592KB

Download
memory/5988-10-0x0000000000060000-0x0000000000072000-memory.dmp

Filesize
72KB

Download
memory/5988-8-0x0000000000060000-0x0000000000072000-memory.dmp

Filesize
72KB

Download
memory/5988-6-0x0000000000060000-0x0000000000072000-memory.dmp

Filesize
72KB

Download