formbook | ea4ff2f24588108641954f72800aabab7348ccc64d86f8293dd23cfc45f5faa1

General

Target

vbc.exe
Size

1.2MB
MD5

77cd3eac0feb00d232d794c3880b9e91
SHA1

e258c7782240346e9a3e9897bd1629bbd40dbd15
SHA256

ea4ff2f24588108641954f72800aabab7348ccc64d86f8293dd23cfc45f5faa1
SHA512

16162f31e50f6f4025f0e0996338e6fb29c3cb20754da8835637a0e9b7c8bd432e8c4ded9febd97cabd4830c5c3940e6ad9b56afcd73c9d447a3d62d92951911

Score

10^/10

formbook xloader ud5f coreentity loader persistence rat spyware stealer suricata trojan

Malware Config

Extracted

Family

xloader

Version

2.6

Campaign

ud5f

Decoy

makcoll.com

mitrachocloud.com

finikilspase.site

vertriebmitherz.gmbh

terapiasdelsinuips.com

schoolmink.online

slotgacor588.xyz

zkf-lawyer.com

daskocleaning.com

baoxin-design.com

hollywoodcuts.net

animefnix.com

trinityhomesolutionsok.com

cfrhsw.xyz

articrowd.com

jlivingfurniture.com

marmolsystem.com

nudehack.com

beam-birds.com

cravensoft.com

Signatures

CoreEntity .NET Packer 1 IoCs

A .NET packer called CoreEntity where it has embedded the payload as a BitMap object which is later decrypted.

coreentity

Processes:

resource	yara_rule
behavioral2/memory/3740-130-0x0000000000890000-0x00000000009C2000-memory.dmp	coreentity

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
suricata: ET MALWARE FormBook CnC Checkin (POST) M2
suricata: ET MALWARE FormBook CnC Checkin (POST) M2
suricata

Xloader Payload 3 IoCs

rat

Processes:

resource	yara_rule
behavioral2/memory/4576-135-0x0000000000400000-0x000000000042C000-memory.dmp	xloader
behavioral2/memory/4576-140-0x0000000000400000-0x000000000042C000-memory.dmp	xloader
behavioral2/memory/4456-146-0x00000000001A0000-0x00000000001CB000-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:

help.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\ZFAHMDJ0CNY = "C:\\Program Files (x86)\\Crr5h\\ubc8put8ho.exe"	help.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	help.exe

Executes dropped EXE 1 IoCs

Processes:

ubc8put8ho.exe

pid process

4084 ubc8put8ho.exe
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
Uses the VBS compiler for execution 1 TTPs

Scripting
T1064

pid	process
4084	ubc8put8ho.exe

Suspicious use of SetThreadContext 4 IoCs

Processes:

vbc.exetaskkill.exehelp.exe

description	pid	process	target process
PID 3740 set thread context of 4576	3740	vbc.exe	taskkill.exe
PID 4576 set thread context of 3252	4576	taskkill.exe	Explorer.EXE
PID 4576 set thread context of 3252	4576	taskkill.exe	Explorer.EXE
PID 4456 set thread context of 3252	4456	help.exe	Explorer.EXE

Drops file in Program Files directory 4 IoCs

Processes:

Explorer.EXEhelp.exe

description	ioc	process
File created	C:\Program Files (x86)\Crr5h\ubc8put8ho.exe	Explorer.EXE
File opened for modification	C:\Program Files (x86)\Crr5h\ubc8put8ho.exe	Explorer.EXE
File opened for modification	C:\Program Files (x86)\Crr5h\ubc8put8ho.exe	help.exe
File opened for modification	C:\Program Files (x86)\Crr5h	Explorer.EXE

Kills process with taskkill 1 IoCs
evasion

Processes:

taskkill.exe

pid process

4576 taskkill.exe

pid	process
4576	taskkill.exe

Modifies Internet Explorer settings 1 TTPs 1 IoCs

adware spyware

Modify Registry

T1112

Processes:

help.exe

description	ioc	process
Key created	\Registry\User\S-1-5-21-3751123196-3323558407-1869646069-1000\SOFTWARE\Microsoft\Internet Explorer\IntelliForms\Storage2	help.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

Processes:

vbc.exetaskkill.exehelp.exe

pid	process
3740	vbc.exe
3740	vbc.exe
3740	vbc.exe
3740	vbc.exe
3740	vbc.exe
3740	vbc.exe
3740	vbc.exe
3740	vbc.exe
4576	taskkill.exe
4576	taskkill.exe
4576	taskkill.exe
4576	taskkill.exe
3740	vbc.exe
3740	vbc.exe
4576	taskkill.exe
4576	taskkill.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

Explorer.EXE

pid process

3252 Explorer.EXE
Suspicious behavior: MapViewOfSection 8 IoCs

Processes:

taskkill.exehelp.exe

pid process

4576 taskkill.exe
4576 taskkill.exe
4576 taskkill.exe
4576 taskkill.exe
4456 help.exe
4456 help.exe
4456 help.exe
4456 help.exe

pid	process
3252	Explorer.EXE

pid	process
4576	taskkill.exe
4576	taskkill.exe
4576	taskkill.exe
4576	taskkill.exe
4456	help.exe
4456	help.exe
4456	help.exe
4456	help.exe

Suspicious use of AdjustPrivilegeToken 11 IoCs

Processes:

vbc.exetaskkill.exehelp.exeExplorer.EXE

description	pid	process
Token: SeDebugPrivilege	3740	vbc.exe
Token: SeDebugPrivilege	4576	taskkill.exe
Token: SeDebugPrivilege	4456	help.exe
Token: SeShutdownPrivilege	3252	Explorer.EXE
Token: SeCreatePagefilePrivilege	3252	Explorer.EXE
Token: SeShutdownPrivilege	3252	Explorer.EXE
Token: SeCreatePagefilePrivilege	3252	Explorer.EXE
Token: SeShutdownPrivilege	3252	Explorer.EXE
Token: SeCreatePagefilePrivilege	3252	Explorer.EXE
Token: SeShutdownPrivilege	3252	Explorer.EXE
Token: SeCreatePagefilePrivilege	3252	Explorer.EXE

Suspicious use of WriteProcessMemory 25 IoCs

Processes:

vbc.exeExplorer.EXEhelp.exe

description	pid	process	target process
PID 3740 wrote to memory of 4576	3740	vbc.exe	taskkill.exe
PID 3740 wrote to memory of 4576	3740	vbc.exe	taskkill.exe
PID 3740 wrote to memory of 4576	3740	vbc.exe	taskkill.exe
PID 3740 wrote to memory of 4576	3740	vbc.exe	taskkill.exe
PID 3740 wrote to memory of 4576	3740	vbc.exe	taskkill.exe
PID 3740 wrote to memory of 4576	3740	vbc.exe	taskkill.exe
PID 3740 wrote to memory of 4576	3740	vbc.exe	taskkill.exe
PID 3252 wrote to memory of 4456	3252	Explorer.EXE	help.exe
PID 3252 wrote to memory of 4456	3252	Explorer.EXE	help.exe
PID 3252 wrote to memory of 4456	3252	Explorer.EXE	help.exe
PID 4456 wrote to memory of 4596	4456	help.exe	cmd.exe
PID 4456 wrote to memory of 4596	4456	help.exe	cmd.exe
PID 4456 wrote to memory of 4596	4456	help.exe	cmd.exe
PID 4456 wrote to memory of 2908	4456	help.exe	cmd.exe
PID 4456 wrote to memory of 2908	4456	help.exe	cmd.exe
PID 4456 wrote to memory of 2908	4456	help.exe	cmd.exe
PID 4456 wrote to memory of 4684	4456	help.exe	cmd.exe
PID 4456 wrote to memory of 4684	4456	help.exe	cmd.exe
PID 4456 wrote to memory of 4684	4456	help.exe	cmd.exe
PID 4456 wrote to memory of 4808	4456	help.exe	Firefox.exe
PID 4456 wrote to memory of 4808	4456	help.exe	Firefox.exe
PID 4456 wrote to memory of 4808	4456	help.exe	Firefox.exe
PID 3252 wrote to memory of 4084	3252	Explorer.EXE	ubc8put8ho.exe
PID 3252 wrote to memory of 4084	3252	Explorer.EXE	ubc8put8ho.exe
PID 3252 wrote to memory of 4084	3252	Explorer.EXE	ubc8put8ho.exe

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Drops file in Program Files directory
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3252

C:\Users\Admin\AppData\Local\Temp\vbc.exe
"C:\Users\Admin\AppData\Local\Temp\vbc.exe"
2⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3740

C:\Windows\SysWOW64\taskkill.exe
"C:\Windows\SysWOW64\taskkill.exe"
3⤵
- Suspicious use of SetThreadContext
- Kills process with taskkill
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
PID:4576

C:\Windows\SysWOW64\help.exe
"C:\Windows\SysWOW64\help.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:4456

C:\Windows\SysWOW64\cmd.exe
/c del "C:\Windows\SysWOW64\taskkill.exe"
3⤵
PID:4596

C:\Windows\SysWOW64\cmd.exe
/c copy "C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Login Data" "C:\Users\Admin\AppData\Local\Temp\DB1" /V
3⤵
PID:2908

C:\Windows\SysWOW64\cmd.exe
/c copy "C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Default\Login Data" "C:\Users\Admin\AppData\Local\Temp\DB1" /V
3⤵
PID:4684

C:\Program Files\Mozilla Firefox\Firefox.exe
"C:\Program Files\Mozilla Firefox\Firefox.exe"
3⤵
PID:4808

C:\Program Files (x86)\Crr5h\ubc8put8ho.exe
"C:\Program Files (x86)\Crr5h\ubc8put8ho.exe"
2⤵
- Executes dropped EXE
PID:4084

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scripting

1

T1064

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

2

T1112

Scripting

1

T1064

Credential Access

Credentials in Files

1

T1081

Discovery

Lateral Movement

Collection

Data from Local System

1

T1005

Exfiltration

Command and Control

Impact

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Downloads

C:\Program Files (x86)\Crr5h\ubc8put8ho.exe
Filesize
72KB

MD5
ca313fd7e6c2a778ffd21cfb5c1c56cd

SHA1
ae2ebb9c1413fbe08b4d066a630f1d1457e0ee1c

SHA256
4e664b35e8de6c6b38e3231dfaf00744435ffb806e00355fece1e0cc1d2121c1

SHA512
c9cffb3bd0d241ac3f3dde14b438f19c3fad740cec2d8b7704b317a88901aaadd441a012ec0fc472aa61737bceb42087c7d14fcc6292f600b413fd80d7ac6401

Download Submit
C:\Program Files (x86)\Crr5h\ubc8put8ho.exe
Filesize
72KB

MD5
ca313fd7e6c2a778ffd21cfb5c1c56cd

SHA1
ae2ebb9c1413fbe08b4d066a630f1d1457e0ee1c

SHA256
4e664b35e8de6c6b38e3231dfaf00744435ffb806e00355fece1e0cc1d2121c1

SHA512
c9cffb3bd0d241ac3f3dde14b438f19c3fad740cec2d8b7704b317a88901aaadd441a012ec0fc472aa61737bceb42087c7d14fcc6292f600b413fd80d7ac6401

Download Submit
C:\Users\Admin\AppData\Local\Temp\DB1
Filesize
40KB

MD5
b608d407fc15adea97c26936bc6f03f6

SHA1
953e7420801c76393902c0d6bb56148947e41571

SHA256
b281ce54125d4250a80f48fcc02a8eea53f2c35c3b726e2512c3d493da0013bf

SHA512
cc96ddf4bf90d6aaa9d86803cb2aa30cd8e9b295aee1bd5544b88aeab63dc60bb1d4641e846c9771bab51aabbfbcd984c6d3ee83b96f5b65d09c0841d464b9e4

Download Submit
C:\Users\Admin\AppData\Local\Temp\DB1
Filesize
48KB

MD5
349e6eb110e34a08924d92f6b334801d

SHA1
bdfb289daff51890cc71697b6322aa4b35ec9169

SHA256
c9fd7be4579e4aa942e8c2b44ab10115fa6c2fe6afd0c584865413d9d53f3b2a

SHA512
2a635b815a5e117ea181ee79305ee1baf591459427acc5210d8c6c7e447be3513ead871c605eb3d32e4ab4111b2a335f26520d0ef8c1245a4af44e1faec44574

Download Submit
memory/2908-150-0x0000000000000000-mapping.dmp

Download
memory/3252-139-0x0000000002B00000-0x0000000002C6F000-memory.dmp

Filesize
1.4MB

Download
memory/3252-142-0x00000000085F0000-0x000000000873F000-memory.dmp

Filesize
1.3MB

Download
memory/3252-149-0x0000000008800000-0x0000000008935000-memory.dmp

Filesize
1.2MB

Download
memory/3740-133-0x0000000004EE0000-0x0000000004F72000-memory.dmp

Filesize
584KB

Download
memory/3740-132-0x00000000055A0000-0x0000000005B44000-memory.dmp

Filesize
5.6MB

Download
memory/3740-131-0x0000000004E40000-0x0000000004EDC000-memory.dmp

Filesize
624KB

Download
memory/3740-130-0x0000000000890000-0x00000000009C2000-memory.dmp

Filesize
1.2MB

Download
memory/4084-154-0x0000000000000000-mapping.dmp

Download
memory/4456-143-0x0000000000000000-mapping.dmp

Download
memory/4456-146-0x00000000001A0000-0x00000000001CB000-memory.dmp

Filesize
172KB

Download
memory/4456-145-0x0000000000190000-0x0000000000197000-memory.dmp

Filesize
28KB

Download
memory/4456-147-0x0000000000B90000-0x0000000000EDA000-memory.dmp

Filesize
3.3MB

Download
memory/4456-148-0x0000000000900000-0x0000000000990000-memory.dmp

Filesize
576KB

Download
memory/4576-141-0x0000000001940000-0x0000000001951000-memory.dmp

Filesize
68KB

Download
memory/4576-140-0x0000000000400000-0x000000000042C000-memory.dmp

Filesize
176KB

Download
memory/4576-138-0x0000000001580000-0x0000000001591000-memory.dmp

Filesize
68KB

Download
memory/4576-137-0x00000000015F0000-0x000000000193A000-memory.dmp

Filesize
3.3MB

Download
memory/4576-135-0x0000000000400000-0x000000000042C000-memory.dmp

Filesize
176KB

Download
memory/4576-134-0x0000000000000000-mapping.dmp

Download
memory/4596-144-0x0000000000000000-mapping.dmp

Download
memory/4684-152-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads