formbook | 38c59ba61fb5ddf358ba31b75eb6a4d7727b1d43fa64f48ecd9aa89acf947b7f

Analysis

max time kernel
148s
max time network
140s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
29-12-2024 23:31

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General

Target

Report and Contract.rtf
Size

2.8MB
MD5

2020683c0740feb8c7a41ea70377b7fc
SHA1

326a0155051677653084e841125984b63b30666a
SHA256

3a0b5b12f26a4751964e2660ee62d20b192e00a044cd322f6867acfa25e341bc
SHA512

b550381f4874e6d0d5d8e7af708f4f122aacbcc1b29fbd7dd528751166591458f1bf2fc725714b2a771cd430a8a02a99999df4a5fa4ee3f277137f2bf7263431
SSDEEP

24576:l0wKl7r3ezbhrC+1J5nbVlvTagtZwAQd5CTkY7PGfk/sGvidzy5AghAoDmqaepIn:O

Score

10^/10

formbook c23e discovery rat spyware stealer trojan

Malware Config

Extracted

Family

formbook

Version

4.1

Campaign

c23e

Decoy

chandu4u.com

jeniusbank.co.uk

electricridesboise.com

streetbriefs.com

mdcsweb.com

czsaj.com

hikz.net

vcel.co.uk

cosmeticsz.com

nickatkeson.com

nilas.fr

goodstaygetaway.co.uk

591easy.net

kryptonapps.com

heveany.com

londonphotoworkshops.co.uk

quique.website

cointwovte.com

foodmie.com

silverdropsofficial.com

Signatures

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

Suspicious use of NtCreateUserProcessOtherParentProcess 1 IoCs

description	pid	Process	procid_target
PID 2864 created 300	2864	Client.exe	17

Formbook payload 2 IoCs

rat

resource	yara_rule
behavioral1/memory/2432-11-0x0000000000400000-0x000000000042F000-memory.dmp	formbook
behavioral1/memory/2940-19-0x0000000000090000-0x00000000000BF000-memory.dmp	formbook

Executes dropped EXE 1 IoCs

pid	Process
2864	Client.exe

Loads dropped DLL 1 IoCs

pid	Process
2096	CmD.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 2864 set thread context of 2432	2864	Client.exe	36
PID 2432 set thread context of 1236	2432	notepad.exe	21
PID 2940 set thread context of 1236	2940	cmstp.exe	21

Drops file in Windows directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Windows\Debug\WIA\wiatrace.log	WINWORD.EXE

System Location Discovery: System Language Discovery 1 TTPs 6 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	cmstp.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	EQNEDT32.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	CmD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Client.exe

Office loads VBA resources, possible macro or embedded object present

Launches Equation Editor 1 TTPs 1 IoCs

Equation Editor is an old Office component often targeted by exploits such as CVE-2017-11882.

exploit

Exploitation for Client Execution

T1203

pid	Process
2264	EQNEDT32.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

pid	Process
2156	WINWORD.EXE

Suspicious behavior: EnumeratesProcesses 36 IoCs

pid	Process
2864	Client.exe
2864	Client.exe
2864	Client.exe
2864	Client.exe
2864	Client.exe
2432	notepad.exe
2432	notepad.exe
2940	cmstp.exe
2940	cmstp.exe
2940	cmstp.exe
2940	cmstp.exe
2940	cmstp.exe
2940	cmstp.exe
2940	cmstp.exe
2940	cmstp.exe
2940	cmstp.exe
2940	cmstp.exe
2940	cmstp.exe
2940	cmstp.exe
2940	cmstp.exe
2940	cmstp.exe
2940	cmstp.exe
2940	cmstp.exe
2940	cmstp.exe
2940	cmstp.exe
2940	cmstp.exe
2940	cmstp.exe
2940	cmstp.exe
2940	cmstp.exe
2940	cmstp.exe
2940	cmstp.exe
2940	cmstp.exe
2940	cmstp.exe
2940	cmstp.exe
2940	cmstp.exe
2940	cmstp.exe

Suspicious behavior: MapViewOfSection 5 IoCs

pid	Process
2432	notepad.exe
2432	notepad.exe
2432	notepad.exe
2940	cmstp.exe
2940	cmstp.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	2864	Client.exe
Token: SeDebugPrivilege	2432	notepad.exe
Token: SeDebugPrivilege	2940	cmstp.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
2156	WINWORD.EXE
2156	WINWORD.EXE

Suspicious use of WriteProcessMemory 31 IoCs

description	pid	Process	procid_target
PID 2264 wrote to memory of 2096	2264	EQNEDT32.EXE	31
PID 2264 wrote to memory of 2096	2264	EQNEDT32.EXE	31
PID 2264 wrote to memory of 2096	2264	EQNEDT32.EXE	31
PID 2264 wrote to memory of 2096	2264	EQNEDT32.EXE	31
PID 2096 wrote to memory of 2864	2096	CmD.exe	34
PID 2096 wrote to memory of 2864	2096	CmD.exe	34
PID 2096 wrote to memory of 2864	2096	CmD.exe	34
PID 2096 wrote to memory of 2864	2096	CmD.exe	34
PID 2864 wrote to memory of 2432	2864	Client.exe	36
PID 2864 wrote to memory of 2432	2864	Client.exe	36
PID 2864 wrote to memory of 2432	2864	Client.exe	36
PID 2864 wrote to memory of 2432	2864	Client.exe	36
PID 2864 wrote to memory of 2432	2864	Client.exe	36
PID 2864 wrote to memory of 2432	2864	Client.exe	36
PID 2864 wrote to memory of 2432	2864	Client.exe	36
PID 2864 wrote to memory of 2432	2864	Client.exe	36
PID 1236 wrote to memory of 2940	1236	Explorer.EXE	37
PID 1236 wrote to memory of 2940	1236	Explorer.EXE	37
PID 1236 wrote to memory of 2940	1236	Explorer.EXE	37
PID 1236 wrote to memory of 2940	1236	Explorer.EXE	37
PID 1236 wrote to memory of 2940	1236	Explorer.EXE	37
PID 1236 wrote to memory of 2940	1236	Explorer.EXE	37
PID 1236 wrote to memory of 2940	1236	Explorer.EXE	37
PID 2940 wrote to memory of 2844	2940	cmstp.exe	38
PID 2940 wrote to memory of 2844	2940	cmstp.exe	38
PID 2940 wrote to memory of 2844	2940	cmstp.exe	38
PID 2940 wrote to memory of 2844	2940	cmstp.exe	38
PID 2156 wrote to memory of 2768	2156	WINWORD.EXE	40
PID 2156 wrote to memory of 2768	2156	WINWORD.EXE	40
PID 2156 wrote to memory of 2768	2156	WINWORD.EXE	40
PID 2156 wrote to memory of 2768	2156	WINWORD.EXE	40

C:\Windows\System32\spoolsv.exe
C:\Windows\System32\spoolsv.exe
1⤵
PID:300
- C:\Windows\SysWOW64\notepad.exe
  C:\Windows\SysWOW64\notepad.exe /Processid:{0689A6C8-CA97-4357-8D1A-84C69E3E0DDD}
  2⤵
  - Suspicious use of SetThreadContext
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of AdjustPrivilegeToken
  PID:2432

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious use of WriteProcessMemory
PID:1236
- C:\Program Files (x86)\Microsoft Office\Office14\WINWORD.EXE
  "C:\Program Files (x86)\Microsoft Office\Office14\WINWORD.EXE" /n "C:\Users\Admin\AppData\Local\Temp\Report and Contract.rtf"
  2⤵
  - Drops file in Windows directory
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: AddClipboardFormatListener
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2156
- - C:\Windows\splwow64.exe
    C:\Windows\splwow64.exe 12288
    3⤵
    PID:2768
- C:\Windows\SysWOW64\cmstp.exe
  "C:\Windows\SysWOW64\cmstp.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:2940
- - C:\Windows\SysWOW64\cmd.exe
    /c del "C:\Windows\SysWOW64\notepad.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:2844

C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE
"C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE" -Embedding
1⤵
- System Location Discovery: System Language Discovery
- Launches Equation Editor
- Suspicious use of WriteProcessMemory
PID:2264
- C:\Windows\SysWOW64\CmD.exe
  CmD.exe /C %tmp%\Client.exe AC
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2096
- - C:\Users\Admin\AppData\Local\Temp\Client.exe
    C:\Users\Admin\AppData\Local\Temp\Client.exe AC
    3⤵
    - Suspicious use of NtCreateUserProcessOtherParentProcess
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:2864

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Exploitation for Client Execution

T1203

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

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Downloads

C:\Users\Admin\AppData\Local\Temp\Client.exe

Filesize
967KB

MD5
9c34362093560a7ad77eb5dd9af9b3ad

SHA1
77aefb3928bbefc174ac437e59cc98ded796ba5e

SHA256
26360323d6dfa0a549cd418f1f276e46213360439d6cb784abce4234fdcc2863

SHA512
1fde2d5a99584f2f236199bc2e8f52db6405c1740c9bbe6dcaebb78a148c5a086dc8d4f3d0fb80bad2f2b7c0b91d3f2c59ec5ee04c7664a0677afd978af1b8f9

Download Submit
memory/1236-17-0x0000000003BE0000-0x0000000003CE0000-memory.dmp

Filesize
1024KB

Download
memory/1236-26-0x0000000007C80000-0x0000000007DEF000-memory.dmp

Filesize
1.4MB

Download
memory/2156-0-0x000000002FC81000-0x000000002FC82000-memory.dmp

Filesize
4KB

Download
memory/2156-1-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/2156-2-0x0000000070FFD000-0x0000000071008000-memory.dmp

Filesize
44KB

Download
memory/2156-21-0x0000000070FFD000-0x0000000071008000-memory.dmp

Filesize
44KB

Download
memory/2432-10-0x0000000000400000-0x000000000042F000-memory.dmp

Filesize
188KB

Download
memory/2432-11-0x0000000000400000-0x000000000042F000-memory.dmp

Filesize
188KB

Download
memory/2864-9-0x0000000000A60000-0x0000000000B5C000-memory.dmp

Filesize
1008KB

Download
memory/2940-18-0x0000000000E70000-0x0000000000E88000-memory.dmp

Filesize
96KB

Download
memory/2940-19-0x0000000000090000-0x00000000000BF000-memory.dmp

Filesize
188KB

Download