formbook | 1bec941f244d3f69b90f2b3166509ccffdfb11959003f53c1ef097beaf4a0969

General

Target

vbc.exe
Size

303KB
MD5

bef72eb124931f8e96965b4e5062605c
SHA1

f2f7fb4c3c0d130dfec7ede1efa1b5187b759ede
SHA256

1bec941f244d3f69b90f2b3166509ccffdfb11959003f53c1ef097beaf4a0969
SHA512

3d8dd5304f53744a82ab9d01e98bdf776dab77507255f81c1a9d377c3a56c440a5c69b01de7dc7d24671a6b287b9a7cc9a57828ffa371b09f22ea0203ca4556a

Score

10^/10

formbook xloader mt88 loader persistence rat spyware stealer suricata trojan

Malware Config

Extracted

Family

xloader

Version

2.6

Campaign

mt88

Decoy

syzbf32.xyz

pertlines.com

vybaveniprocyklostezky.com

elianmsalas.tech

a-snag-tokei-kaitori.com

tuvistaing.com

whoyoucall.net

l8e9gr.xyz

sophrologuemontevrain77.com

ciclean.com

the-roel.com

campgreencove.com

foremostbookkeeping.com

zamanscorner.com

efeturozemniyet.com

penelope.team

murata.life

solfuls.com

tradefitinvesting.com

skinbid.pro

Signatures

Formbook
Formbook is a data stealing malware which is capable of stealing data.
trojan spyware stealer formbook
Xloader
Xloader is a rebranded version of Formbook malware.
loader xloader
suricata: ET MALWARE FormBook CnC Checkin (GET)
suricata: ET MALWARE FormBook CnC Checkin (GET)
suricata

Xloader Payload 5 IoCs

rat

Processes:

resource	yara_rule
behavioral1/memory/1740-60-0x000000000041F2C0-mapping.dmp	xloader
behavioral1/memory/1740-59-0x0000000000400000-0x000000000042B000-memory.dmp	xloader
behavioral1/memory/1740-62-0x0000000000400000-0x000000000042B000-memory.dmp	xloader
behavioral1/memory/2020-70-0x0000000000080000-0x00000000000AB000-memory.dmp	xloader
behavioral1/memory/2020-75-0x0000000000080000-0x00000000000AB000-memory.dmp	xloader

Adds policy Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

raserver.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	raserver.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\1B3DUFW8NHJH = "C:\\Program Files (x86)\\Lbx48f\\winh4g4.exe"	raserver.exe

Uses the VBS compiler for execution 1 TTPs

Scripting
T1064

Suspicious use of SetThreadContext 3 IoCs

Processes:

vbc.execvtres.exeraserver.exe

description	pid	process	target process
PID 548 set thread context of 1740	548	vbc.exe	cvtres.exe
PID 1740 set thread context of 1380	1740	cvtres.exe	Explorer.EXE
PID 2020 set thread context of 1380	2020	raserver.exe	Explorer.EXE

Drops file in Program Files directory 1 IoCs

Processes:

raserver.exe

description ioc process

File opened for modification C:\Program Files (x86)\Lbx48f\winh4g4.exe raserver.exe

description	ioc	process
File opened for modification	C:\Program Files (x86)\Lbx48f\winh4g4.exe	raserver.exe

Modifies Internet Explorer settings 1 TTPs 1 IoCs

adware spyware

Modify Registry

T1112

Processes:

raserver.exe

description	ioc	process
Key created	\Registry\User\S-1-5-21-790309383-526510583-3802439154-1000\SOFTWARE\Microsoft\Internet Explorer\IntelliForms\Storage2	raserver.exe

Suspicious behavior: EnumeratesProcesses 18 IoCs

Processes:

cvtres.exeraserver.exe

pid	process
1740	cvtres.exe
1740	cvtres.exe
2020	raserver.exe
2020	raserver.exe
2020	raserver.exe
2020	raserver.exe
2020	raserver.exe
2020	raserver.exe
2020	raserver.exe
2020	raserver.exe
2020	raserver.exe
2020	raserver.exe
2020	raserver.exe
2020	raserver.exe
2020	raserver.exe
2020	raserver.exe
2020	raserver.exe
2020	raserver.exe

Suspicious behavior: MapViewOfSection 7 IoCs

Processes:

cvtres.exeraserver.exe

pid process

1740 cvtres.exe
1740 cvtres.exe
1740 cvtres.exe
2020 raserver.exe
2020 raserver.exe
2020 raserver.exe
2020 raserver.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

vbc.execvtres.exeraserver.exe

description pid process

Token: SeDebugPrivilege 548 vbc.exe
Token: SeDebugPrivilege 1740 cvtres.exe
Token: SeDebugPrivilege 2020 raserver.exe
Suspicious use of FindShellTrayWindow 2 IoCs

Processes:

Explorer.EXE

pid process

1380 Explorer.EXE
1380 Explorer.EXE
Suspicious use of SendNotifyMessage 2 IoCs

Processes:

Explorer.EXE

pid process

1380 Explorer.EXE
1380 Explorer.EXE

description	pid	process
Token: SeDebugPrivilege	548	vbc.exe
Token: SeDebugPrivilege	1740	cvtres.exe
Token: SeDebugPrivilege	2020	raserver.exe

pid	process
1380	Explorer.EXE
1380	Explorer.EXE

pid	process
1380	Explorer.EXE
1380	Explorer.EXE

Suspicious use of WriteProcessMemory 20 IoCs

Processes:

vbc.exeExplorer.EXEraserver.exe

description	pid	process	target process
PID 548 wrote to memory of 1740	548	vbc.exe	cvtres.exe
PID 548 wrote to memory of 1740	548	vbc.exe	cvtres.exe
PID 548 wrote to memory of 1740	548	vbc.exe	cvtres.exe
PID 548 wrote to memory of 1740	548	vbc.exe	cvtres.exe
PID 548 wrote to memory of 1740	548	vbc.exe	cvtres.exe
PID 548 wrote to memory of 1740	548	vbc.exe	cvtres.exe
PID 548 wrote to memory of 1740	548	vbc.exe	cvtres.exe
PID 1380 wrote to memory of 2020	1380	Explorer.EXE	raserver.exe
PID 1380 wrote to memory of 2020	1380	Explorer.EXE	raserver.exe
PID 1380 wrote to memory of 2020	1380	Explorer.EXE	raserver.exe
PID 1380 wrote to memory of 2020	1380	Explorer.EXE	raserver.exe
PID 2020 wrote to memory of 1728	2020	raserver.exe	cmd.exe
PID 2020 wrote to memory of 1728	2020	raserver.exe	cmd.exe
PID 2020 wrote to memory of 1728	2020	raserver.exe	cmd.exe
PID 2020 wrote to memory of 1728	2020	raserver.exe	cmd.exe
PID 2020 wrote to memory of 616	2020	raserver.exe	Firefox.exe
PID 2020 wrote to memory of 616	2020	raserver.exe	Firefox.exe
PID 2020 wrote to memory of 616	2020	raserver.exe	Firefox.exe
PID 2020 wrote to memory of 616	2020	raserver.exe	Firefox.exe
PID 2020 wrote to memory of 616	2020	raserver.exe	Firefox.exe

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:1380

C:\Users\Admin\AppData\Local\Temp\vbc.exe
"C:\Users\Admin\AppData\Local\Temp\vbc.exe"
2⤵
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:548

C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe"
3⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
PID:1740

C:\Windows\SysWOW64\raserver.exe
"C:\Windows\SysWOW64\raserver.exe"
2⤵
- Adds policy Run key to start application
- Suspicious use of SetThreadContext
- Drops file in Program Files directory
- Modifies Internet Explorer settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2020

C:\Windows\SysWOW64\cmd.exe
/c del "C:\Windows\Microsoft.NET\Framework\v4.0.30319\cvtres.exe"
3⤵
PID:1728

C:\Program Files\Mozilla Firefox\Firefox.exe
"C:\Program Files\Mozilla Firefox\Firefox.exe"
3⤵
PID:616

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scripting

1

T1064

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

Scripting

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

memory/548-55-0x00000000007F0000-0x0000000000824000-memory.dmp

Filesize
208KB

Download
memory/548-54-0x00000000008B0000-0x0000000000902000-memory.dmp

Filesize
328KB

Download
memory/1380-65-0x0000000003EB0000-0x0000000003F5E000-memory.dmp

Filesize
696KB

Download
memory/1380-74-0x0000000003EB0000-0x0000000003F5E000-memory.dmp

Filesize
696KB

Download
memory/1380-73-0x0000000006E40000-0x0000000006FBA000-memory.dmp

Filesize
1.5MB

Download
memory/1380-76-0x0000000006E40000-0x0000000006FBA000-memory.dmp

Filesize
1.5MB

Download
memory/1728-68-0x0000000000000000-mapping.dmp

Download
memory/1740-57-0x0000000000400000-0x000000000042B000-memory.dmp

Filesize
172KB

Download
memory/1740-64-0x0000000000190000-0x00000000001A1000-memory.dmp

Filesize
68KB

Download
memory/1740-63-0x0000000000910000-0x0000000000C13000-memory.dmp

Filesize
3.0MB

Download
memory/1740-62-0x0000000000400000-0x000000000042B000-memory.dmp

Filesize
172KB

Download
memory/1740-59-0x0000000000400000-0x000000000042B000-memory.dmp

Filesize
172KB

Download
memory/1740-60-0x000000000041F2C0-mapping.dmp

Download
memory/1740-56-0x0000000000400000-0x000000000042B000-memory.dmp

Filesize
172KB

Download
memory/2020-66-0x0000000000000000-mapping.dmp

Download
memory/2020-71-0x0000000000A20000-0x0000000000D23000-memory.dmp

Filesize
3.0MB

Download
memory/2020-72-0x00000000007F0000-0x0000000000880000-memory.dmp

Filesize
576KB

Download
memory/2020-69-0x0000000000E70000-0x0000000000E8C000-memory.dmp

Filesize
112KB

Download
memory/2020-70-0x0000000000080000-0x00000000000AB000-memory.dmp

Filesize
172KB

Download
memory/2020-75-0x0000000000080000-0x00000000000AB000-memory.dmp

Filesize
172KB

Download
memory/2020-67-0x0000000075D21000-0x0000000075D23000-memory.dmp

Filesize
8KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads