formbook | c5aeea780284df094e25baa02aedae7dac89bb65c3f110499f22588c9e53d522

General

Target

rrk590123c.exe
Size

297KB
MD5

668a6855d8ce2efa9f23170bd7c5ac5e
SHA1

0586ab192841fa947644184d667e81640ea25957
SHA256

7dcb1ee79eae7ff95e311aa25d0f73f1d89c266a8f609dfd31782054b03c3de6
SHA512

7070bb748df0445b88c2438dd738967d61f10523a148e6df84088dd0baba36c5a4861685056f024b2f55b8f3bf1a7021a8a5adc43ed7d0580937d1de8c5a87de
SSDEEP

6144:hsg/lR8Nb2PKfOlQQ7b5q9lDY5m0cW6qpzt1lOMzxGusc7d5iv2:hsg/lmbjzjtMiO5iv2

Score

10^/10

formbook k1rc discovery rat spyware stealer trojan

Malware Config

Extracted

Family

formbook

Version

4.1

Campaign

k1rc

Decoy

manchesterflowerwalls.com

hyperhostns.info

leverj.exchange

bringcovidhome.com

natalieball.com

glaseye.com

buyersmeetsellers.net

dronerealestate.net

calfwag.com

hoodhippy.com

prophunting.com

yange03.com

ffpgv.top

valengz.com

handbagsbreeze.com

excellencepi.com

iopsms.xyz

farmacykauai.com

dmarc.press

aridham.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
behavioral1/memory/2952-3-0x0000000000400000-0x000000000042E000-memory.dmp	formbook
behavioral1/memory/2952-5-0x0000000000400000-0x000000000042E000-memory.dmp	formbook

Deletes itself 1 IoCs

pid	Process
2760	cmd.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 1924 set thread context of 2952	1924	rrk590123c.exe	32
PID 2952 set thread context of 1196	2952	rrk590123c.exe	21
PID 2040 set thread context of 1196	2040	cmd.exe	21

System Location Discovery: System Language Discovery 1 TTPs 3 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	rrk590123c.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Suspicious behavior: EnumeratesProcesses 32 IoCs

pid	Process
2952	rrk590123c.exe
2952	rrk590123c.exe
2040	cmd.exe
2040	cmd.exe
2040	cmd.exe
2040	cmd.exe
2040	cmd.exe
2040	cmd.exe
2040	cmd.exe
2040	cmd.exe
2040	cmd.exe
2040	cmd.exe
2040	cmd.exe
2040	cmd.exe
2040	cmd.exe
2040	cmd.exe
2040	cmd.exe
2040	cmd.exe
2040	cmd.exe
2040	cmd.exe
2040	cmd.exe
2040	cmd.exe
2040	cmd.exe
2040	cmd.exe
2040	cmd.exe
2040	cmd.exe
2040	cmd.exe
2040	cmd.exe
2040	cmd.exe
2040	cmd.exe
2040	cmd.exe
2040	cmd.exe

Suspicious behavior: MapViewOfSection 6 IoCs

pid	Process
1924	rrk590123c.exe
2952	rrk590123c.exe
2952	rrk590123c.exe
2952	rrk590123c.exe
2040	cmd.exe
2040	cmd.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2952	rrk590123c.exe
Token: SeDebugPrivilege	2040	cmd.exe

Suspicious use of FindShellTrayWindow 2 IoCs

pid	Process
1196	Explorer.EXE
1196	Explorer.EXE

Suspicious use of SendNotifyMessage 2 IoCs

pid	Process
1196	Explorer.EXE
1196	Explorer.EXE

Suspicious use of WriteProcessMemory 13 IoCs

description	pid	Process	procid_target
PID 1924 wrote to memory of 2952	1924	rrk590123c.exe	32
PID 1924 wrote to memory of 2952	1924	rrk590123c.exe	32
PID 1924 wrote to memory of 2952	1924	rrk590123c.exe	32
PID 1924 wrote to memory of 2952	1924	rrk590123c.exe	32
PID 1924 wrote to memory of 2952	1924	rrk590123c.exe	32
PID 1196 wrote to memory of 2040	1196	Explorer.EXE	33
PID 1196 wrote to memory of 2040	1196	Explorer.EXE	33
PID 1196 wrote to memory of 2040	1196	Explorer.EXE	33
PID 1196 wrote to memory of 2040	1196	Explorer.EXE	33
PID 2040 wrote to memory of 2760	2040	cmd.exe	34
PID 2040 wrote to memory of 2760	2040	cmd.exe	34
PID 2040 wrote to memory of 2760	2040	cmd.exe	34
PID 2040 wrote to memory of 2760	2040	cmd.exe	34

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:1196
- C:\Users\Admin\AppData\Local\Temp\rrk590123c.exe
  "C:\Users\Admin\AppData\Local\Temp\rrk590123c.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of WriteProcessMemory
  PID:1924
- - C:\Users\Admin\AppData\Local\Temp\rrk590123c.exe
    "C:\Users\Admin\AppData\Local\Temp\rrk590123c.exe"
    3⤵
    - Suspicious use of SetThreadContext
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious behavior: MapViewOfSection
    - Suspicious use of AdjustPrivilegeToken
    PID:2952
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\SysWOW64\cmd.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:2040
- - C:\Windows\SysWOW64\cmd.exe
    /c del "C:\Users\Admin\AppData\Local\Temp\rrk590123c.exe"
    3⤵
    - Deletes itself
    - System Location Discovery: System Language Discovery
    PID:2760

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

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Downloads

memory/1196-6-0x0000000005150000-0x000000000524E000-memory.dmp

Filesize
1016KB

Download
memory/1196-11-0x0000000005150000-0x000000000524E000-memory.dmp

Filesize
1016KB

Download
memory/1196-15-0x0000000006B60000-0x0000000006CC0000-memory.dmp

Filesize
1.4MB

Download
memory/1196-16-0x0000000006B60000-0x0000000006CC0000-memory.dmp

Filesize
1.4MB

Download
memory/1196-18-0x0000000006B60000-0x0000000006CC0000-memory.dmp

Filesize
1.4MB

Download
memory/1924-2-0x0000000000290000-0x0000000000292000-memory.dmp

Filesize
8KB

Download
memory/1924-1-0x0000000000090000-0x0000000000190000-memory.dmp

Filesize
1024KB

Download
memory/2040-10-0x000000004A010000-0x000000004A05C000-memory.dmp

Filesize
304KB

Download
memory/2040-9-0x000000004A010000-0x000000004A05C000-memory.dmp

Filesize
304KB

Download
memory/2952-3-0x0000000000400000-0x000000000042E000-memory.dmp

Filesize
184KB

Download
memory/2952-5-0x0000000000400000-0x000000000042E000-memory.dmp

Filesize
184KB

Download

Analysis

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