formbook | cf0d36f933310c07f1554db7e6e8a2e79c01ee933717e13f96ae841302306512

Analysis

max time kernel
150s
max time network
122s
platform
windows7_x64
resource
win7-20240903-en
resource tags

arch:x64arch:x86image:win7-20240903-enlocale:en-usos:windows7-x64system
submitted
09-01-2025 11:19

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General

Target

$PLUGINSDIR/brfrqelhtqi.dll
Size

20KB
MD5

08f8c05553706af957306d9cce346ebb
SHA1

bc1ccb5f00c582752d4a5103b122fe5299dad8d4
SHA256

628e6ecd0231ccdefd6d684a8d0f07ff16f0213ae04e29adb7ff94853cce2cc3
SHA512

3dd9ea6672f45734931e194b066fe042a4d79e6cdd8a8999b874b7a4eaacf09d123e77d996be795b0d6e131fd9555e17fd4af445c1ad8c9a9cd3cb5f0ec1e0a1
SSDEEP

384:XhdYW9jFrFH0SiNDTovgjztjlYew/CyYUidEI0aKjc:xdYmpBUh9j55RWCyYfEIBKA

Score

10^/10

formbook dn7r discovery rat spyware stealer trojan

Malware Config

Extracted

Family

formbook

Version

4.1

Campaign

dn7r

Decoy

eventphotographerdfw.com

thehalalcoinstaking.com

philipfaziofineart.com

intercoh.com

gaiaseyephotography.com

chatbotforrealestate.com

lovelancemg.com

marlieskasberger.com

elcongoenespanol.info

lepirecredit.com

distribution-concept.com

e99game.com

exit11festival.com

twodollartoothbrushclub.com

cocktailsandlawn.com

performimprove.network

24horas-telefono-11840.com

cosmossify.com

kellenleote.com

perovskite.energy

Signatures

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

Formbook payload 3 IoCs

rat

resource	yara_rule
behavioral3/memory/3032-1-0x0000000000400000-0x000000000042F000-memory.dmp	formbook
behavioral3/memory/3032-4-0x0000000000400000-0x000000000042F000-memory.dmp	formbook
behavioral3/memory/2088-10-0x00000000000F0000-0x000000000011F000-memory.dmp	formbook

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 3008 set thread context of 3032	3008	rundll32.exe	29
PID 3032 set thread context of 1196	3032	rundll32.exe	21
PID 2088 set thread context of 1196	2088	wuapp.exe	21

Program crash 1 IoCs

pid	pid_target	Process	procid_target
2560	3008	WerFault.exe	28

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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	rundll32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	wuapp.exe

Suspicious behavior: EnumeratesProcesses 32 IoCs

pid	Process
3032	rundll32.exe
3032	rundll32.exe
2088	wuapp.exe
2088	wuapp.exe
2088	wuapp.exe
2088	wuapp.exe
2088	wuapp.exe
2088	wuapp.exe
2088	wuapp.exe
2088	wuapp.exe
2088	wuapp.exe
2088	wuapp.exe
2088	wuapp.exe
2088	wuapp.exe
2088	wuapp.exe
2088	wuapp.exe
2088	wuapp.exe
2088	wuapp.exe
2088	wuapp.exe
2088	wuapp.exe
2088	wuapp.exe
2088	wuapp.exe
2088	wuapp.exe
2088	wuapp.exe
2088	wuapp.exe
2088	wuapp.exe
2088	wuapp.exe
2088	wuapp.exe
2088	wuapp.exe
2088	wuapp.exe
2088	wuapp.exe
2088	wuapp.exe

Suspicious behavior: MapViewOfSection 5 IoCs

pid	Process
3032	rundll32.exe
3032	rundll32.exe
3032	rundll32.exe
2088	wuapp.exe
2088	wuapp.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	3032	rundll32.exe
Token: SeShutdownPrivilege	1196	Explorer.EXE
Token: SeDebugPrivilege	2088	wuapp.exe
Token: SeShutdownPrivilege	1196	Explorer.EXE
Token: SeShutdownPrivilege	1196	Explorer.EXE

Suspicious use of WriteProcessMemory 32 IoCs

description	pid	Process	procid_target
PID 2900 wrote to memory of 3008	2900	rundll32.exe	28
PID 2900 wrote to memory of 3008	2900	rundll32.exe	28
PID 2900 wrote to memory of 3008	2900	rundll32.exe	28
PID 2900 wrote to memory of 3008	2900	rundll32.exe	28
PID 2900 wrote to memory of 3008	2900	rundll32.exe	28
PID 2900 wrote to memory of 3008	2900	rundll32.exe	28
PID 2900 wrote to memory of 3008	2900	rundll32.exe	28
PID 3008 wrote to memory of 3032	3008	rundll32.exe	29
PID 3008 wrote to memory of 3032	3008	rundll32.exe	29
PID 3008 wrote to memory of 3032	3008	rundll32.exe	29
PID 3008 wrote to memory of 3032	3008	rundll32.exe	29
PID 3008 wrote to memory of 3032	3008	rundll32.exe	29
PID 3008 wrote to memory of 3032	3008	rundll32.exe	29
PID 3008 wrote to memory of 3032	3008	rundll32.exe	29
PID 3008 wrote to memory of 3032	3008	rundll32.exe	29
PID 3008 wrote to memory of 3032	3008	rundll32.exe	29
PID 3008 wrote to memory of 3032	3008	rundll32.exe	29
PID 3008 wrote to memory of 2560	3008	rundll32.exe	30
PID 3008 wrote to memory of 2560	3008	rundll32.exe	30
PID 3008 wrote to memory of 2560	3008	rundll32.exe	30
PID 3008 wrote to memory of 2560	3008	rundll32.exe	30
PID 1196 wrote to memory of 2088	1196	Explorer.EXE	31
PID 1196 wrote to memory of 2088	1196	Explorer.EXE	31
PID 1196 wrote to memory of 2088	1196	Explorer.EXE	31
PID 1196 wrote to memory of 2088	1196	Explorer.EXE	31
PID 1196 wrote to memory of 2088	1196	Explorer.EXE	31
PID 1196 wrote to memory of 2088	1196	Explorer.EXE	31
PID 1196 wrote to memory of 2088	1196	Explorer.EXE	31
PID 2088 wrote to memory of 2312	2088	wuapp.exe	32
PID 2088 wrote to memory of 2312	2088	wuapp.exe	32
PID 2088 wrote to memory of 2312	2088	wuapp.exe	32
PID 2088 wrote to memory of 2312	2088	wuapp.exe	32

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1196
- C:\Windows\system32\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\brfrqelhtqi.dll,#1
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2900
- - C:\Windows\SysWOW64\rundll32.exe
    rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\brfrqelhtqi.dll,#1
    3⤵
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:3008
  - - C:\Windows\SysWOW64\rundll32.exe
      rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\brfrqelhtqi.dll,#1
      4⤵
      Suspicious use of SetThreadContext
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      Suspicious behavior: MapViewOfSection
      Suspicious use of AdjustPrivilegeToken
      PID:3032
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3008 -s 244
      4⤵
      Program crash
      PID:2560
- C:\Windows\SysWOW64\wuapp.exe
  "C:\Windows\SysWOW64\wuapp.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:2088
- - C:\Windows\SysWOW64\cmd.exe
    /c del "C:\Windows\SysWOW64\rundll32.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:2312

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/1196-6-0x0000000005160000-0x000000000530D000-memory.dmp

Filesize
1.7MB

Download
memory/1196-19-0x0000000006730000-0x0000000006822000-memory.dmp

Filesize
968KB

Download
memory/1196-17-0x0000000006730000-0x0000000006822000-memory.dmp

Filesize
968KB

Download
memory/1196-16-0x0000000006730000-0x0000000006822000-memory.dmp

Filesize
968KB

Download
memory/1196-11-0x0000000005160000-0x000000000530D000-memory.dmp

Filesize
1.7MB

Download
memory/2088-7-0x0000000000EA0000-0x0000000000EAB000-memory.dmp

Filesize
44KB

Download
memory/2088-9-0x0000000000EA0000-0x0000000000EAB000-memory.dmp

Filesize
44KB

Download
memory/2088-10-0x00000000000F0000-0x000000000011F000-memory.dmp

Filesize
188KB

Download
memory/3008-0-0x0000000010005000-0x0000000010007000-memory.dmp

Filesize
8KB

Download
memory/3032-4-0x0000000000400000-0x000000000042F000-memory.dmp

Filesize
188KB

Download
memory/3032-5-0x00000000001A0000-0x00000000001B5000-memory.dmp

Filesize
84KB

Download
memory/3032-2-0x0000000002050000-0x0000000002353000-memory.dmp

Filesize
3.0MB

Download
memory/3032-1-0x0000000000400000-0x000000000042F000-memory.dmp

Filesize
188KB

Download