formbook | 05058845f830c184d8e97d779426424ffa31a10f48300f4716b55539db735813

General

Target

Dekont.exe
Size

731KB
MD5

b13f89d8eafc3a90742bb8fe102e4225
SHA1

8c0a430ea82da3282be9c2dc2011c0d1b4a3cc2b
SHA256

e7fc9e51d81f4b40dca80a3d83ca54a03120566b6dd6f76e0299546ac178f633
SHA512

85d98bc784bce0cbf5d7264e44b89d1a72c7892aeb9defbe622f7844479d9dcd06d2679e7ec0e2f8691af334dfdbb17540ffb55f24e2f06b8ecb9f53b5f13e13
SSDEEP

12288:53O+0J9NQxftcBfz6wzGxGOuyNwuhzKm+gATKkwpf8Z0l14r7N5:JqJvQxFu76eGEnymcATXwpfGj7N

Score

10^/10

formbook bc01 discovery execution rat spyware stealer trojan

Malware Config

Extracted

Family

formbook

Version

4.1

Campaign

bc01

Decoy

epatitis-treatment-26155.bond

52cy67sk.bond

nline-degree-6987776.world

ingxingdiandeng-2033.top

mberbreeze.cyou

48xc300mw.autos

obs-for-seniors-39582.bond

tpetersburg-3-tonn.online

egafon-parser.online

172jh.shop

ltraman.pro

bqfhnys.shop

ntercash24-cad.homes

uhtwister.cloud

alk-in-tubs-27353.bond

ucas-saaad.buzz

oko.events

8080713.xyz

refabricated-homes-74404.bond

inaa.boo

Signatures

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

Formbook payload 3 IoCs

rat

resource	yara_rule
behavioral1/memory/2876-14-0x0000000000400000-0x000000000042F000-memory.dmp	formbook
behavioral1/memory/2876-18-0x0000000000400000-0x000000000042F000-memory.dmp	formbook
behavioral1/memory/2836-25-0x0000000000080000-0x00000000000AF000-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
2272	powershell.exe

Deletes itself 1 IoCs

pid	Process
2928	cmd.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 2080 set thread context of 2876	2080	Dekont.exe	33
PID 2876 set thread context of 1184	2876	Dekont.exe	21
PID 2836 set thread context of 1184	2836	svchost.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	svchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Suspicious behavior: EnumeratesProcesses 30 IoCs

pid	Process
2876	Dekont.exe
2876	Dekont.exe
2272	powershell.exe
2836	svchost.exe
2836	svchost.exe
2836	svchost.exe
2836	svchost.exe
2836	svchost.exe
2836	svchost.exe
2836	svchost.exe
2836	svchost.exe
2836	svchost.exe
2836	svchost.exe
2836	svchost.exe
2836	svchost.exe
2836	svchost.exe
2836	svchost.exe
2836	svchost.exe
2836	svchost.exe
2836	svchost.exe
2836	svchost.exe
2836	svchost.exe
2836	svchost.exe
2836	svchost.exe
2836	svchost.exe
2836	svchost.exe
2836	svchost.exe
2836	svchost.exe
2836	svchost.exe
2836	svchost.exe

Suspicious behavior: MapViewOfSection 5 IoCs

pid	Process
2876	Dekont.exe
2876	Dekont.exe
2876	Dekont.exe
2836	svchost.exe
2836	svchost.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	2876	Dekont.exe
Token: SeDebugPrivilege	2272	powershell.exe
Token: SeDebugPrivilege	2836	svchost.exe

Suspicious use of WriteProcessMemory 19 IoCs

description	pid	Process	procid_target
PID 2080 wrote to memory of 2272	2080	Dekont.exe	31
PID 2080 wrote to memory of 2272	2080	Dekont.exe	31
PID 2080 wrote to memory of 2272	2080	Dekont.exe	31
PID 2080 wrote to memory of 2272	2080	Dekont.exe	31
PID 2080 wrote to memory of 2876	2080	Dekont.exe	33
PID 2080 wrote to memory of 2876	2080	Dekont.exe	33
PID 2080 wrote to memory of 2876	2080	Dekont.exe	33
PID 2080 wrote to memory of 2876	2080	Dekont.exe	33
PID 2080 wrote to memory of 2876	2080	Dekont.exe	33
PID 2080 wrote to memory of 2876	2080	Dekont.exe	33
PID 2080 wrote to memory of 2876	2080	Dekont.exe	33
PID 1184 wrote to memory of 2836	1184	Explorer.EXE	34
PID 1184 wrote to memory of 2836	1184	Explorer.EXE	34
PID 1184 wrote to memory of 2836	1184	Explorer.EXE	34
PID 1184 wrote to memory of 2836	1184	Explorer.EXE	34
PID 2836 wrote to memory of 2928	2836	svchost.exe	35
PID 2836 wrote to memory of 2928	2836	svchost.exe	35
PID 2836 wrote to memory of 2928	2836	svchost.exe	35
PID 2836 wrote to memory of 2928	2836	svchost.exe	35

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious use of WriteProcessMemory
PID:1184
- 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:2080
- - 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:2272
- - 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:2876
- C:\Windows\SysWOW64\svchost.exe
  "C:\Windows\SysWOW64\svchost.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:2836
- - 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:2928

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/1184-20-0x0000000004F50000-0x00000000050C1000-memory.dmp

Filesize
1.4MB

Download
memory/1184-17-0x0000000000010000-0x0000000000020000-memory.dmp

Filesize
64KB

Download
memory/1184-26-0x0000000004F50000-0x00000000050C1000-memory.dmp

Filesize
1.4MB

Download
memory/2080-6-0x00000000003A0000-0x0000000000416000-memory.dmp

Filesize
472KB

Download
memory/2080-4-0x000000007431E000-0x000000007431F000-memory.dmp

Filesize
4KB

Download
memory/2080-5-0x0000000074310000-0x00000000749FE000-memory.dmp

Filesize
6.9MB

Download
memory/2080-3-0x0000000000500000-0x000000000051E000-memory.dmp

Filesize
120KB

Download
memory/2080-2-0x0000000074310000-0x00000000749FE000-memory.dmp

Filesize
6.9MB

Download
memory/2080-0-0x000000007431E000-0x000000007431F000-memory.dmp

Filesize
4KB

Download
memory/2080-1-0x00000000013C0000-0x000000000147E000-memory.dmp

Filesize
760KB

Download
memory/2080-21-0x0000000074310000-0x00000000749FE000-memory.dmp

Filesize
6.9MB

Download
memory/2836-25-0x0000000000080000-0x00000000000AF000-memory.dmp

Filesize
188KB

Download
memory/2836-24-0x0000000000310000-0x0000000000318000-memory.dmp

Filesize
32KB

Download
memory/2876-7-0x0000000000400000-0x000000000042F000-memory.dmp

Filesize
188KB

Download
memory/2876-19-0x00000000001B0000-0x00000000001C4000-memory.dmp

Filesize
80KB

Download
memory/2876-18-0x0000000000400000-0x000000000042F000-memory.dmp

Filesize
188KB

Download
memory/2876-15-0x0000000000880000-0x0000000000B83000-memory.dmp

Filesize
3.0MB

Download
memory/2876-9-0x0000000000400000-0x000000000042F000-memory.dmp

Filesize
188KB

Download
memory/2876-11-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2876-14-0x0000000000400000-0x000000000042F000-memory.dmp

Filesize
188KB

Download

Analysis

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