formbook | fa2a38ee7933b6eec66fed45d0f14e9cb4009ce04d5b56cf7e753af46626ada0

General

Target

Dekont.exe
Size

607KB
MD5

10a0eb65b2183e25abb783e188eb69e0
SHA1

86d0693cb57425c210c8e4dc0b588db254fb6e65
SHA256

fa2a38ee7933b6eec66fed45d0f14e9cb4009ce04d5b56cf7e753af46626ada0
SHA512

0cdc358bb6c1781843d1d32c40659bc07eba8e99573f946be6c141de98906511aae598a04ea80f9aef229f8fcf755fc2d53475bed46f89277678072e75681fb5
SSDEEP

12288:s4y2kNXpOEaScZtB/dIvhwg5A14raeOesU6aW6jndC:sV2opOEaS0tB/iZwEY5beuAjdC

Score

10^/10

formbook by21 discovery execution rat spyware stealer trojan

Malware Config

Extracted

Family

formbook

Version

4.1

Campaign

by21

Decoy

digitalillusions.net

changeblue25.com

kitchenwoow.com

grupocontigoalimentacion.com

iranabr.com

embodiedmagic.com

superstoreszone.com

apartments-for-rent-46883.bond

kelbagnole.com

rideskratchlab.com

a06kng.club

saddlebredallstars.xyz

filepd.com

kxetdf.asia

dl39yy.com

jackedsearch.com

exodusprofessionaldetailing.com

ecommerce-40144.bond

uh3b94g3pyczi9t.skin

dcmcc635i.xyz

Signatures

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

Formbook payload 4 IoCs

rat

resource	yara_rule
behavioral1/memory/2712-10-0x0000000000400000-0x000000000042F000-memory.dmp	formbook
behavioral1/memory/2712-14-0x0000000000400000-0x000000000042F000-memory.dmp	formbook
behavioral1/memory/2712-21-0x0000000000400000-0x000000000042F000-memory.dmp	formbook
behavioral1/memory/2492-22-0x00000000000D0000-0x00000000000FF000-memory.dmp	formbook

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

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

execution

PowerShell

T1059.001

pid	Process
2688	powershell.exe

Deletes itself 1 IoCs

pid	Process
2560	cmd.exe

Suspicious use of SetThreadContext 4 IoCs

description	pid	Process	procid_target
PID 2676 set thread context of 2712	2676	Dekont.exe	30
PID 2712 set thread context of 1212	2712	Dekont.exe	21
PID 2712 set thread context of 1212	2712	Dekont.exe	21
PID 2492 set thread context of 1212	2492	cmmon32.exe	21

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

System Information Discovery
T1082

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	Dekont.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmmon32.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Suspicious behavior: EnumeratesProcesses 29 IoCs

pid	Process
2712	Dekont.exe
2712	Dekont.exe
2688	powershell.exe
2712	Dekont.exe
2492	cmmon32.exe
2492	cmmon32.exe
2492	cmmon32.exe
2492	cmmon32.exe
2492	cmmon32.exe
2492	cmmon32.exe
2492	cmmon32.exe
2492	cmmon32.exe
2492	cmmon32.exe
2492	cmmon32.exe
2492	cmmon32.exe
2492	cmmon32.exe
2492	cmmon32.exe
2492	cmmon32.exe
2492	cmmon32.exe
2492	cmmon32.exe
2492	cmmon32.exe
2492	cmmon32.exe
2492	cmmon32.exe
2492	cmmon32.exe
2492	cmmon32.exe
2492	cmmon32.exe
2492	cmmon32.exe
2492	cmmon32.exe
2492	cmmon32.exe

Suspicious behavior: MapViewOfSection 6 IoCs

pid	Process
2712	Dekont.exe
2712	Dekont.exe
2712	Dekont.exe
2712	Dekont.exe
2492	cmmon32.exe
2492	cmmon32.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	2712	Dekont.exe
Token: SeDebugPrivilege	2688	powershell.exe
Token: SeDebugPrivilege	2492	cmmon32.exe

Suspicious use of WriteProcessMemory 19 IoCs

description	pid	Process	procid_target
PID 2676 wrote to memory of 2688	2676	Dekont.exe	28
PID 2676 wrote to memory of 2688	2676	Dekont.exe	28
PID 2676 wrote to memory of 2688	2676	Dekont.exe	28
PID 2676 wrote to memory of 2688	2676	Dekont.exe	28
PID 2676 wrote to memory of 2712	2676	Dekont.exe	30
PID 2676 wrote to memory of 2712	2676	Dekont.exe	30
PID 2676 wrote to memory of 2712	2676	Dekont.exe	30
PID 2676 wrote to memory of 2712	2676	Dekont.exe	30
PID 2676 wrote to memory of 2712	2676	Dekont.exe	30
PID 2676 wrote to memory of 2712	2676	Dekont.exe	30
PID 2676 wrote to memory of 2712	2676	Dekont.exe	30
PID 1212 wrote to memory of 2492	1212	Explorer.EXE	31
PID 1212 wrote to memory of 2492	1212	Explorer.EXE	31
PID 1212 wrote to memory of 2492	1212	Explorer.EXE	31
PID 1212 wrote to memory of 2492	1212	Explorer.EXE	31
PID 2492 wrote to memory of 2560	2492	cmmon32.exe	32
PID 2492 wrote to memory of 2560	2492	cmmon32.exe	32
PID 2492 wrote to memory of 2560	2492	cmmon32.exe	32
PID 2492 wrote to memory of 2560	2492	cmmon32.exe	32

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious use of WriteProcessMemory
PID:1212
- C:\Users\Admin\AppData\Local\Temp\Dekont.exe
  "C:\Users\Admin\AppData\Local\Temp\Dekont.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2676
- - 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\Dekont.exe"
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - System Location Discovery: System Language Discovery
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2688
- - C:\Users\Admin\AppData\Local\Temp\Dekont.exe
    "C:\Users\Admin\AppData\Local\Temp\Dekont.exe"
    3⤵
    - Suspicious use of SetThreadContext
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious behavior: MapViewOfSection
    - Suspicious use of AdjustPrivilegeToken
    PID:2712
- C:\Windows\SysWOW64\cmmon32.exe
  "C:\Windows\SysWOW64\cmmon32.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:2492
- - C:\Windows\SysWOW64\cmd.exe
    /c del "C:\Users\Admin\AppData\Local\Temp\Dekont.exe"
    3⤵
    - Deletes itself
    - System Location Discovery: System Language Discovery
    PID:2560

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/1212-18-0x0000000006500000-0x000000000663B000-memory.dmp

Filesize
1.2MB

Download
memory/1212-25-0x0000000006500000-0x000000000663B000-memory.dmp

Filesize
1.2MB

Download
memory/2492-22-0x00000000000D0000-0x00000000000FF000-memory.dmp

Filesize
188KB

Download
memory/2492-20-0x0000000000F20000-0x0000000000F2D000-memory.dmp

Filesize
52KB

Download
memory/2676-1-0x0000000000E20000-0x0000000000EBE000-memory.dmp

Filesize
632KB

Download
memory/2676-2-0x00000000746C0000-0x0000000074DAE000-memory.dmp

Filesize
6.9MB

Download
memory/2676-3-0x00000000006A0000-0x00000000006B6000-memory.dmp

Filesize
88KB

Download
memory/2676-4-0x0000000000650000-0x000000000065E000-memory.dmp

Filesize
56KB

Download
memory/2676-5-0x00000000042C0000-0x0000000004336000-memory.dmp

Filesize
472KB

Download
memory/2676-0-0x00000000746CE000-0x00000000746CF000-memory.dmp

Filesize
4KB

Download
memory/2676-11-0x00000000746C0000-0x0000000074DAE000-memory.dmp

Filesize
6.9MB

Download
memory/2712-7-0x0000000000400000-0x000000000042F000-memory.dmp

Filesize
188KB

Download
memory/2712-15-0x0000000000210000-0x0000000000224000-memory.dmp

Filesize
80KB

Download
memory/2712-14-0x0000000000400000-0x000000000042F000-memory.dmp

Filesize
188KB

Download
memory/2712-13-0x00000000008A0000-0x0000000000BA3000-memory.dmp

Filesize
3.0MB

Download
memory/2712-21-0x0000000000400000-0x000000000042F000-memory.dmp

Filesize
188KB

Download
memory/2712-6-0x0000000000400000-0x000000000042F000-memory.dmp

Filesize
188KB

Download
memory/2712-10-0x0000000000400000-0x000000000042F000-memory.dmp

Filesize
188KB

Download
memory/2712-8-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download

Analysis

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