formbook | b13782a081582cd40a427da82c93035d3a59cd7dffea1e9b3f3821c55fde233c

Analysis

max time kernel
125s
max time network
140s
platform
windows10_x64
resource
win10-en-20211208
submitted
10-12-2021 13:39

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General

Target

0b50a75467d375b948edc7bcb6f01b60.exe
Size

273KB
MD5

0b50a75467d375b948edc7bcb6f01b60
SHA1

d9d70c204806b74acf34e95e44f5528031e777a6
SHA256

b13782a081582cd40a427da82c93035d3a59cd7dffea1e9b3f3821c55fde233c
SHA512

267933362fd75201a23c33b075045f564871fe9a8ee3681a515ae1e5abb29686015274919a0db92a33b78d0cc0566bfffde47cd1906834ea912dc298cdc5c7ad

Score

10^/10

formbook nk6l rat spyware stealer trojan

Malware Config

Extracted

Family

formbook

Version

4.1

Campaign

nk6l

http://www.rthearts.com/nk6l/

Decoy

cbnextra.com

entitysystemsinc.com

55midwoodave.com

ebelizzi.com

khojcity.com

1527brokenoakdrive.site

housinghproperties.com

ratiousa.com

lrcrepresentacoes.net

tocoec.net

khadamatdemnate.com

davidkastner.xyz

gardeniaresort.com

qiantangguoji.com

visaprepaidprocessinq.com

cristinamadara.com

semapisus.xyz

mpwebagency.net

alibabasdeli.com

gigasupplies.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
behavioral2/memory/3832-119-0x0000000000400000-0x000000000042F000-memory.dmp	formbook
behavioral2/memory/3832-120-0x000000000041F0F0-mapping.dmp	formbook

Loads dropped DLL 1 IoCs

pid	Process
2776	0b50a75467d375b948edc7bcb6f01b60.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2776 set thread context of 3832	2776	0b50a75467d375b948edc7bcb6f01b60.exe	68

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3832	0b50a75467d375b948edc7bcb6f01b60.exe
3832	0b50a75467d375b948edc7bcb6f01b60.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2776 wrote to memory of 3832	2776	0b50a75467d375b948edc7bcb6f01b60.exe	68
PID 2776 wrote to memory of 3832	2776	0b50a75467d375b948edc7bcb6f01b60.exe	68
PID 2776 wrote to memory of 3832	2776	0b50a75467d375b948edc7bcb6f01b60.exe	68
PID 2776 wrote to memory of 3832	2776	0b50a75467d375b948edc7bcb6f01b60.exe	68
PID 2776 wrote to memory of 3832	2776	0b50a75467d375b948edc7bcb6f01b60.exe	68
PID 2776 wrote to memory of 3832	2776	0b50a75467d375b948edc7bcb6f01b60.exe	68

C:\Users\Admin\AppData\Local\Temp\0b50a75467d375b948edc7bcb6f01b60.exe
"C:\Users\Admin\AppData\Local\Temp\0b50a75467d375b948edc7bcb6f01b60.exe"
1⤵
- Loads dropped DLL
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2776
- C:\Users\Admin\AppData\Local\Temp\0b50a75467d375b948edc7bcb6f01b60.exe
  "C:\Users\Admin\AppData\Local\Temp\0b50a75467d375b948edc7bcb6f01b60.exe"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  PID:3832

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/3832-119-0x0000000000400000-0x000000000042F000-memory.dmp

Filesize
188KB

Download
memory/3832-121-0x0000000000AE0000-0x0000000000E00000-memory.dmp

Filesize
3.1MB

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