formbook | cbd43bdcb7e75cff1e937fe47faa7770647da504aa28fbf3f1b7415ac282456e

General

Target

$PLUGINSDIR/mfhecv.dll
Size

30KB
MD5

e97a552be97bf8ca0cd083250ef8b343
SHA1

8283294c2b23684bf1aa6bdc7729ef80efcf7673
SHA256

7ae5225917f9eb18e030e2aad1c0b9f7a3fc5789986e9222281cb3663d5f0775
SHA512

0f9f53254f11ee2f3cf757ba5459c8380bd07872cbb12a5dc0a681f978e5c10eb136bca57de593adbd806980d1484896a47ab4eaab1794c98113b80992e9a07a
SSDEEP

768:AYYsBQJDh7wN4Ce1k95WuPO8P9se1wcEWTF9D8E:AoBQJD6LPO8P9fwcE0qE

Score

10^/10

formbook s3dy discovery rat spyware stealer trojan

Malware Config

Extracted

Family

formbook

Version

4.1

Campaign

s3dy

Decoy

ravlygte.info

marketnewsville.online

flooring-envy.com

flavourhouston.com

donghohanghieunam.com

globleitsolutions.com

digitalgraphicarts.com

cupidbeautybar.com

cannavybes.com

negative-dsp.com

littledali.com

meltwatersoftware.info

blackdogland.com

danasales.com

mississippiscorecard.com

mainesmoker.com

sirenxinlilzixun.com

tychehang.com

gentciu.com

weckloltd.com

Signatures

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
behavioral3/memory/2888-1-0x0000000000400000-0x000000000042E000-memory.dmp	formbook
behavioral3/memory/2888-5-0x0000000000400000-0x000000000042E000-memory.dmp	formbook

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 2864 set thread context of 2888	2864	rundll32.exe	31
PID 2888 set thread context of 1208	2888	rundll32.exe	21
PID 2424 set thread context of 1208	2424	help.exe	21

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

Suspicious behavior: EnumeratesProcesses 31 IoCs

pid	Process
2888	rundll32.exe
2888	rundll32.exe
2424	help.exe
2424	help.exe
2424	help.exe
2424	help.exe
2424	help.exe
2424	help.exe
2424	help.exe
2424	help.exe
2424	help.exe
2424	help.exe
2424	help.exe
2424	help.exe
2424	help.exe
2424	help.exe
2424	help.exe
2424	help.exe
2424	help.exe
2424	help.exe
2424	help.exe
2424	help.exe
2424	help.exe
2424	help.exe
2424	help.exe
2424	help.exe
2424	help.exe
2424	help.exe
2424	help.exe
2424	help.exe
2424	help.exe

Suspicious behavior: MapViewOfSection 5 IoCs

pid	Process
2888	rundll32.exe
2888	rundll32.exe
2888	rundll32.exe
2424	help.exe
2424	help.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2888	rundll32.exe
Token: SeDebugPrivilege	2424	help.exe

Suspicious use of WriteProcessMemory 25 IoCs

description	pid	Process	procid_target
PID 2756 wrote to memory of 2864	2756	rundll32.exe	30
PID 2756 wrote to memory of 2864	2756	rundll32.exe	30
PID 2756 wrote to memory of 2864	2756	rundll32.exe	30
PID 2756 wrote to memory of 2864	2756	rundll32.exe	30
PID 2756 wrote to memory of 2864	2756	rundll32.exe	30
PID 2756 wrote to memory of 2864	2756	rundll32.exe	30
PID 2756 wrote to memory of 2864	2756	rundll32.exe	30
PID 2864 wrote to memory of 2888	2864	rundll32.exe	31
PID 2864 wrote to memory of 2888	2864	rundll32.exe	31
PID 2864 wrote to memory of 2888	2864	rundll32.exe	31
PID 2864 wrote to memory of 2888	2864	rundll32.exe	31
PID 2864 wrote to memory of 2888	2864	rundll32.exe	31
PID 2864 wrote to memory of 2888	2864	rundll32.exe	31
PID 2864 wrote to memory of 2888	2864	rundll32.exe	31
PID 2864 wrote to memory of 2888	2864	rundll32.exe	31
PID 2864 wrote to memory of 2888	2864	rundll32.exe	31
PID 2864 wrote to memory of 2888	2864	rundll32.exe	31
PID 1208 wrote to memory of 2424	1208	Explorer.EXE	32
PID 1208 wrote to memory of 2424	1208	Explorer.EXE	32
PID 1208 wrote to memory of 2424	1208	Explorer.EXE	32
PID 1208 wrote to memory of 2424	1208	Explorer.EXE	32
PID 2424 wrote to memory of 3064	2424	help.exe	33
PID 2424 wrote to memory of 3064	2424	help.exe	33
PID 2424 wrote to memory of 3064	2424	help.exe	33
PID 2424 wrote to memory of 3064	2424	help.exe	33

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious use of WriteProcessMemory
PID:1208
- C:\Windows\system32\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\mfhecv.dll,#1
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2756
- - C:\Windows\SysWOW64\rundll32.exe
    rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\mfhecv.dll,#1
    3⤵
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2864
  - - C:\Windows\SysWOW64\rundll32.exe
      rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\mfhecv.dll,#1
      4⤵
      Suspicious use of SetThreadContext
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      Suspicious behavior: MapViewOfSection
      Suspicious use of AdjustPrivilegeToken
      PID:2888
- C:\Windows\SysWOW64\help.exe
  "C:\Windows\SysWOW64\help.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:2424
- - C:\Windows\SysWOW64\cmd.exe
    /c del "C:\Windows\SysWOW64\rundll32.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:3064

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

memory/1208-7-0x0000000004EB0000-0x0000000004F87000-memory.dmp

Filesize
860KB

Download
memory/1208-10-0x0000000004EB0000-0x0000000004F87000-memory.dmp

Filesize
860KB

Download
memory/2424-9-0x0000000000570000-0x0000000000576000-memory.dmp

Filesize
24KB

Download
memory/2424-8-0x0000000000570000-0x0000000000576000-memory.dmp

Filesize
24KB

Download
memory/2864-0-0x0000000010000000-0x000000001000B000-memory.dmp

Filesize
44KB

Download
memory/2864-2-0x0000000010000000-0x000000001000B000-memory.dmp

Filesize
44KB

Download
memory/2888-1-0x0000000000400000-0x000000000042E000-memory.dmp

Filesize
184KB

Download
memory/2888-3-0x00000000021B0000-0x00000000024B3000-memory.dmp

Filesize
3.0MB

Download
memory/2888-6-0x00000000001C0000-0x00000000001D4000-memory.dmp

Filesize
80KB

Download
memory/2888-5-0x0000000000400000-0x000000000042E000-memory.dmp

Filesize
184KB

Download

Analysis

Sharing