formbook | d8e0769ada04d3face55959134a7eee5e55ef10f65eedeae65d9218e4371ace4

General

Target

PO328632.exe
Size

777KB
MD5

9f5b32d6839c520b18b9ba182e3c47e7
SHA1

dac91fc3f2dcdc37262418f60b743b52770312b2
SHA256

e1791b23657d18fc636878f24a44a32f1a2ae4814668600b14b10c03e48c587c
SHA512

7e9e796be039ff6a60dd8fe5e2bc2d64634a85d0998267148ebbfd02e870faf241fc2cb9c178ddab8ef8a5e65bdeb0ad3db004bedd6439df54e1922667ebc5cc

Score

10^/10

formbook xloader b6fg loader persistence rat spyware stealer suricata trojan

Malware Config

Extracted

Family

xloader

Version

2.0

Campaign

b6fg

Decoy

multlockmt5.com

mohajrannoor.com

robynhoodofretail.info

belinv.com

hotellasab.com

kibrismosad.com

xn--fxwm39aeb590h.xn--io0a7i

resetbrasil.com

tcsonhvac.com

theresav.net

bohoqi.info

machinafuturae.com

mambavault.com

xn--980am9a.top

yumiang.com

evntmonitor.com

83003kk.com

triterm.com

8800pe.com

silvanstudio.com

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 1 IoCs

rat

Processes:

resource	yara_rule
behavioral1/memory/968-64-0x00000000000D0000-0x00000000000F7000-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:

rundll32.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\LPXXV = "C:\\Program Files (x86)\\Ybbctah\\chkdskz6qlg.exe"	rundll32.exe

Executes dropped EXE 2 IoCs

Processes:

chkdskz6qlg.exechkdskz6qlg.exe

pid process

1548 chkdskz6qlg.exe
1496 chkdskz6qlg.exe
Deletes itself 1 IoCs

Processes:

cmd.exe

pid process

1388 cmd.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

pid	process
1548	chkdskz6qlg.exe
1496	chkdskz6qlg.exe

pid	process
1388	cmd.exe

Suspicious use of SetThreadContext 4 IoCs

Processes:

PO328632.exePO328632.exerundll32.exechkdskz6qlg.exe

description	pid	process	target process
PID 1304 set thread context of 1312	1304	PO328632.exe	PO328632.exe
PID 1312 set thread context of 1296	1312	PO328632.exe	Explorer.EXE
PID 968 set thread context of 1296	968	rundll32.exe	Explorer.EXE
PID 1548 set thread context of 1496	1548	chkdskz6qlg.exe	chkdskz6qlg.exe

Drops file in Program Files directory 2 IoCs

Processes:

rundll32.exeExplorer.EXE

description	ioc	process
File opened for modification	C:\Program Files (x86)\Ybbctah\chkdskz6qlg.exe	rundll32.exe
File created	C:\Program Files (x86)\Ybbctah\chkdskz6qlg.exe	Explorer.EXE

Modifies Internet Explorer settings 1 TTPs 1 IoCs

adware spyware

Modify Registry

T1112

Processes:

rundll32.exe

description	ioc	process
Key created	\Registry\User\S-1-5-21-2277218442-1199762539-2004043321-1000\SOFTWARE\Microsoft\Internet Explorer\IntelliForms\Storage2	rundll32.exe

Suspicious behavior: EnumeratesProcesses 29 IoCs

Processes:

PO328632.exePO328632.exerundll32.exechkdskz6qlg.exechkdskz6qlg.exe

pid	process
1304	PO328632.exe
1312	PO328632.exe
1312	PO328632.exe
968	rundll32.exe
968	rundll32.exe
968	rundll32.exe
968	rundll32.exe
968	rundll32.exe
968	rundll32.exe
968	rundll32.exe
968	rundll32.exe
968	rundll32.exe
968	rundll32.exe
968	rundll32.exe
968	rundll32.exe
968	rundll32.exe
968	rundll32.exe
968	rundll32.exe
968	rundll32.exe
968	rundll32.exe
968	rundll32.exe
968	rundll32.exe
968	rundll32.exe
968	rundll32.exe
1548	chkdskz6qlg.exe
1496	chkdskz6qlg.exe
968	rundll32.exe
968	rundll32.exe
968	rundll32.exe

Suspicious behavior: MapViewOfSection 9 IoCs

Processes:

PO328632.exePO328632.exerundll32.exechkdskz6qlg.exe

pid	process
1304	PO328632.exe
1312	PO328632.exe
1312	PO328632.exe
1312	PO328632.exe
968	rundll32.exe
968	rundll32.exe
968	rundll32.exe
968	rundll32.exe
1548	chkdskz6qlg.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

PO328632.exerundll32.exechkdskz6qlg.exe

description pid process

Token: SeDebugPrivilege 1312 PO328632.exe
Token: SeDebugPrivilege 968 rundll32.exe
Token: SeDebugPrivilege 1496 chkdskz6qlg.exe
Suspicious use of FindShellTrayWindow 2 IoCs

Processes:

Explorer.EXE

pid process

1296 Explorer.EXE
1296 Explorer.EXE
Suspicious use of SendNotifyMessage 2 IoCs

Processes:

Explorer.EXE

pid process

1296 Explorer.EXE
1296 Explorer.EXE

description	pid	process
Token: SeDebugPrivilege	1312	PO328632.exe
Token: SeDebugPrivilege	968	rundll32.exe
Token: SeDebugPrivilege	1496	chkdskz6qlg.exe

pid	process
1296	Explorer.EXE
1296	Explorer.EXE

pid	process
1296	Explorer.EXE
1296	Explorer.EXE

Suspicious use of WriteProcessMemory 28 IoCs

Processes:

PO328632.exeExplorer.EXErundll32.exechkdskz6qlg.exe

description	pid	process	target process
PID 1304 wrote to memory of 1312	1304	PO328632.exe	PO328632.exe
PID 1304 wrote to memory of 1312	1304	PO328632.exe	PO328632.exe
PID 1304 wrote to memory of 1312	1304	PO328632.exe	PO328632.exe
PID 1304 wrote to memory of 1312	1304	PO328632.exe	PO328632.exe
PID 1296 wrote to memory of 968	1296	Explorer.EXE	rundll32.exe
PID 1296 wrote to memory of 968	1296	Explorer.EXE	rundll32.exe
PID 1296 wrote to memory of 968	1296	Explorer.EXE	rundll32.exe
PID 1296 wrote to memory of 968	1296	Explorer.EXE	rundll32.exe
PID 1296 wrote to memory of 968	1296	Explorer.EXE	rundll32.exe
PID 1296 wrote to memory of 968	1296	Explorer.EXE	rundll32.exe
PID 1296 wrote to memory of 968	1296	Explorer.EXE	rundll32.exe
PID 968 wrote to memory of 1388	968	rundll32.exe	cmd.exe
PID 968 wrote to memory of 1388	968	rundll32.exe	cmd.exe
PID 968 wrote to memory of 1388	968	rundll32.exe	cmd.exe
PID 968 wrote to memory of 1388	968	rundll32.exe	cmd.exe
PID 968 wrote to memory of 1888	968	rundll32.exe	Firefox.exe
PID 968 wrote to memory of 1888	968	rundll32.exe	Firefox.exe
PID 968 wrote to memory of 1888	968	rundll32.exe	Firefox.exe
PID 968 wrote to memory of 1888	968	rundll32.exe	Firefox.exe
PID 968 wrote to memory of 1888	968	rundll32.exe	Firefox.exe
PID 1296 wrote to memory of 1548	1296	Explorer.EXE	chkdskz6qlg.exe
PID 1296 wrote to memory of 1548	1296	Explorer.EXE	chkdskz6qlg.exe
PID 1296 wrote to memory of 1548	1296	Explorer.EXE	chkdskz6qlg.exe
PID 1296 wrote to memory of 1548	1296	Explorer.EXE	chkdskz6qlg.exe
PID 1548 wrote to memory of 1496	1548	chkdskz6qlg.exe	chkdskz6qlg.exe
PID 1548 wrote to memory of 1496	1548	chkdskz6qlg.exe	chkdskz6qlg.exe
PID 1548 wrote to memory of 1496	1548	chkdskz6qlg.exe	chkdskz6qlg.exe
PID 1548 wrote to memory of 1496	1548	chkdskz6qlg.exe	chkdskz6qlg.exe

System policy modification 1 TTPs 1 IoCs
evasion

Modify Registry
T1112

Processes:

rundll32.exe

description ioc process

Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer rundll32.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer	rundll32.exe

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Drops file in Program Files directory
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:1296

C:\Users\Admin\AppData\Local\Temp\PO328632.exe
"C:\Users\Admin\AppData\Local\Temp\PO328632.exe"
2⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:1304

C:\Users\Admin\AppData\Local\Temp\PO328632.exe
"C:\Users\Admin\AppData\Local\Temp\PO328632.exe"
3⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
PID:1312

C:\Windows\SysWOW64\autofmt.exe
"C:\Windows\SysWOW64\autofmt.exe"
2⤵
PID:964

C:\Windows\SysWOW64\rundll32.exe
"C:\Windows\SysWOW64\rundll32.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
- System policy modification
PID:968

C:\Windows\SysWOW64\cmd.exe
/c del "C:\Users\Admin\AppData\Local\Temp\PO328632.exe"
3⤵
- Deletes itself
PID:1388

C:\Program Files\Mozilla Firefox\Firefox.exe
"C:\Program Files\Mozilla Firefox\Firefox.exe"
3⤵
PID:1888

C:\Program Files (x86)\Ybbctah\chkdskz6qlg.exe
"C:\Program Files (x86)\Ybbctah\chkdskz6qlg.exe"
2⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:1548

C:\Program Files (x86)\Ybbctah\chkdskz6qlg.exe
"C:\Program Files (x86)\Ybbctah\chkdskz6qlg.exe"
3⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1496

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

3

T1112

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)\Ybbctah\chkdskz6qlg.exe
Filesize
777KB

MD5
9f5b32d6839c520b18b9ba182e3c47e7

SHA1
dac91fc3f2dcdc37262418f60b743b52770312b2

SHA256
e1791b23657d18fc636878f24a44a32f1a2ae4814668600b14b10c03e48c587c

SHA512
7e9e796be039ff6a60dd8fe5e2bc2d64634a85d0998267148ebbfd02e870faf241fc2cb9c178ddab8ef8a5e65bdeb0ad3db004bedd6439df54e1922667ebc5cc

Download Submit
C:\Program Files (x86)\Ybbctah\chkdskz6qlg.exe
Filesize
777KB

MD5
9f5b32d6839c520b18b9ba182e3c47e7

SHA1
dac91fc3f2dcdc37262418f60b743b52770312b2

SHA256
e1791b23657d18fc636878f24a44a32f1a2ae4814668600b14b10c03e48c587c

SHA512
7e9e796be039ff6a60dd8fe5e2bc2d64634a85d0998267148ebbfd02e870faf241fc2cb9c178ddab8ef8a5e65bdeb0ad3db004bedd6439df54e1922667ebc5cc

Download Submit
C:\Program Files (x86)\Ybbctah\chkdskz6qlg.exe
Filesize
777KB

MD5
9f5b32d6839c520b18b9ba182e3c47e7

SHA1
dac91fc3f2dcdc37262418f60b743b52770312b2

SHA256
e1791b23657d18fc636878f24a44a32f1a2ae4814668600b14b10c03e48c587c

SHA512
7e9e796be039ff6a60dd8fe5e2bc2d64634a85d0998267148ebbfd02e870faf241fc2cb9c178ddab8ef8a5e65bdeb0ad3db004bedd6439df54e1922667ebc5cc

Download Submit
memory/968-63-0x00000000009A0000-0x00000000009AE000-memory.dmp

Filesize
56KB

Download
memory/968-66-0x00000000009F0000-0x0000000000A7F000-memory.dmp

Filesize
572KB

Download
memory/968-65-0x0000000002090000-0x0000000002393000-memory.dmp

Filesize
3.0MB

Download
memory/968-60-0x0000000000000000-mapping.dmp

Download
memory/968-64-0x00000000000D0000-0x00000000000F7000-memory.dmp

Filesize
156KB

Download
memory/1296-67-0x0000000008030000-0x0000000008159000-memory.dmp

Filesize
1.2MB

Download
memory/1296-59-0x00000000072D0000-0x0000000007466000-memory.dmp

Filesize
1.6MB

Download
memory/1304-54-0x0000000076451000-0x0000000076453000-memory.dmp

Filesize
8KB

Download
memory/1304-56-0x00000000003E0000-0x00000000003E9000-memory.dmp

Filesize
36KB

Download
memory/1312-58-0x0000000000290000-0x00000000002A0000-memory.dmp

Filesize
64KB

Download
memory/1312-57-0x0000000000860000-0x0000000000B63000-memory.dmp

Filesize
3.0MB

Download
memory/1312-55-0x000000000041C160-mapping.dmp

Download
memory/1388-62-0x0000000000000000-mapping.dmp

Download
memory/1496-72-0x000000000041C160-mapping.dmp

Download
memory/1496-74-0x0000000000810000-0x0000000000B13000-memory.dmp

Filesize
3.0MB

Download
memory/1548-68-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads