formbook | c9549188a883c695f762d2af10e33868ce431ab96537bde6e81824364f5d4f89

General

Target

$PLUGINSDIR/gtrvk.dll
Size

5KB
MD5

3627e0a769af64650e5ce46db6bb0532
SHA1

e203eaa9b1ad5d324af6696f5d1a62cd58e3513a
SHA256

a5699137065d3f0f5a26372a17eecc76905599435d866608f10c38760eb43e52
SHA512

044cb6198c848e4edd870fc9a5647e6a4644753986f2557da0babb0c9004ca14031b93c4db92d84754a297619bb87bdb6f847a3887c037180df4603583b908d1
SSDEEP

96:q6nmydg7sZIu+kYVz2LIu+3PSehGfZSfl59CC:B1dvIH+I+e6AfR

Score

10^/10

formbook sl12 discovery rat spyware stealer trojan

Malware Config

Extracted

Family

formbook

Version

4.1

Campaign

sl12

Decoy

monsore-records.com

discoverthis.world

ishop-brasil.com

foxeshaveholesintl.com

currenteitherknowledge.xyz

haaph.com

leggacyfarm.com

theaudiobookdb.net

ungerstahlbaubrehna.com

cliphindi.com

thht86.com

b4d5h0t.com

yashentcbsmall.com

ltcibenefits.com

allwaystravelservice.com

1gethear.com

elstery.com

buyervalet.com

snowyrangecpa.com

bshuan.icu

Signatures

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

Formbook payload 3 IoCs

rat

resource	yara_rule
behavioral3/memory/2720-1-0x0000000000400000-0x000000000042F000-memory.dmp	formbook
behavioral3/memory/2720-4-0x0000000000400000-0x000000000042F000-memory.dmp	formbook
behavioral3/memory/2848-9-0x0000000000080000-0x00000000000AF000-memory.dmp	formbook

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 2684 set thread context of 2720	2684	rundll32.exe	31
PID 2720 set thread context of 1192	2720	rundll32.exe	21
PID 2848 set thread context of 1192	2848	chkdsk.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	chkdsk.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Enumerates system info in registry 2 TTPs 1 IoCs

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\Identifier	chkdsk.exe

Suspicious behavior: EnumeratesProcesses 31 IoCs

pid	Process
2720	rundll32.exe
2720	rundll32.exe
2848	chkdsk.exe
2848	chkdsk.exe
2848	chkdsk.exe
2848	chkdsk.exe
2848	chkdsk.exe
2848	chkdsk.exe
2848	chkdsk.exe
2848	chkdsk.exe
2848	chkdsk.exe
2848	chkdsk.exe
2848	chkdsk.exe
2848	chkdsk.exe
2848	chkdsk.exe
2848	chkdsk.exe
2848	chkdsk.exe
2848	chkdsk.exe
2848	chkdsk.exe
2848	chkdsk.exe
2848	chkdsk.exe
2848	chkdsk.exe
2848	chkdsk.exe
2848	chkdsk.exe
2848	chkdsk.exe
2848	chkdsk.exe
2848	chkdsk.exe
2848	chkdsk.exe
2848	chkdsk.exe
2848	chkdsk.exe
2848	chkdsk.exe

Suspicious behavior: MapViewOfSection 5 IoCs

pid	Process
2720	rundll32.exe
2720	rundll32.exe
2720	rundll32.exe
2848	chkdsk.exe
2848	chkdsk.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2720	rundll32.exe
Token: SeDebugPrivilege	2848	chkdsk.exe

Suspicious use of WriteProcessMemory 25 IoCs

description	pid	Process	procid_target
PID 2192 wrote to memory of 2684	2192	rundll32.exe	30
PID 2192 wrote to memory of 2684	2192	rundll32.exe	30
PID 2192 wrote to memory of 2684	2192	rundll32.exe	30
PID 2192 wrote to memory of 2684	2192	rundll32.exe	30
PID 2192 wrote to memory of 2684	2192	rundll32.exe	30
PID 2192 wrote to memory of 2684	2192	rundll32.exe	30
PID 2192 wrote to memory of 2684	2192	rundll32.exe	30
PID 2684 wrote to memory of 2720	2684	rundll32.exe	31
PID 2684 wrote to memory of 2720	2684	rundll32.exe	31
PID 2684 wrote to memory of 2720	2684	rundll32.exe	31
PID 2684 wrote to memory of 2720	2684	rundll32.exe	31
PID 2684 wrote to memory of 2720	2684	rundll32.exe	31
PID 2684 wrote to memory of 2720	2684	rundll32.exe	31
PID 2684 wrote to memory of 2720	2684	rundll32.exe	31
PID 2684 wrote to memory of 2720	2684	rundll32.exe	31
PID 2684 wrote to memory of 2720	2684	rundll32.exe	31
PID 2684 wrote to memory of 2720	2684	rundll32.exe	31
PID 1192 wrote to memory of 2848	1192	Explorer.EXE	32
PID 1192 wrote to memory of 2848	1192	Explorer.EXE	32
PID 1192 wrote to memory of 2848	1192	Explorer.EXE	32
PID 1192 wrote to memory of 2848	1192	Explorer.EXE	32
PID 2848 wrote to memory of 2692	2848	chkdsk.exe	33
PID 2848 wrote to memory of 2692	2848	chkdsk.exe	33
PID 2848 wrote to memory of 2692	2848	chkdsk.exe	33
PID 2848 wrote to memory of 2692	2848	chkdsk.exe	33

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious use of WriteProcessMemory
PID:1192
- C:\Windows\system32\rundll32.exe
  rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\gtrvk.dll,#1
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2192
- - C:\Windows\SysWOW64\rundll32.exe
    rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\gtrvk.dll,#1
    3⤵
    - Suspicious use of SetThreadContext
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2684
  - - C:\Windows\SysWOW64\rundll32.exe
      rundll32.exe C:\Users\Admin\AppData\Local\Temp\$PLUGINSDIR\gtrvk.dll,#1
      4⤵
      Suspicious use of SetThreadContext
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      Suspicious behavior: MapViewOfSection
      Suspicious use of AdjustPrivilegeToken
      PID:2720
- C:\Windows\SysWOW64\chkdsk.exe
  "C:\Windows\SysWOW64\chkdsk.exe"
  2⤵
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Enumerates system info in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:2848
- - C:\Windows\SysWOW64\cmd.exe
    /c del "C:\Windows\SysWOW64\rundll32.exe"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:2692

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

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/1192-6-0x0000000004230000-0x00000000042E8000-memory.dmp

Filesize
736KB

Download
memory/1192-10-0x0000000004230000-0x00000000042E8000-memory.dmp

Filesize
736KB

Download
memory/1192-12-0x0000000000010000-0x0000000000020000-memory.dmp

Filesize
64KB

Download
memory/2684-0-0x0000000000110000-0x0000000000112000-memory.dmp

Filesize
8KB

Download
memory/2720-1-0x0000000000400000-0x000000000042F000-memory.dmp

Filesize
188KB

Download
memory/2720-2-0x0000000002270000-0x0000000002573000-memory.dmp

Filesize
3.0MB

Download
memory/2720-5-0x00000000001F0000-0x0000000000204000-memory.dmp

Filesize
80KB

Download
memory/2720-4-0x0000000000400000-0x000000000042F000-memory.dmp

Filesize
188KB

Download
memory/2848-7-0x0000000000590000-0x0000000000597000-memory.dmp

Filesize
28KB

Download
memory/2848-8-0x0000000000590000-0x0000000000597000-memory.dmp

Filesize
28KB

Download
memory/2848-9-0x0000000000080000-0x00000000000AF000-memory.dmp

Filesize
188KB

Download

Analysis

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