formbook | 1c22bad3a6eb408ec1f4d6ef50b04e2294a77979abc411f9dbb752e2b495345b

General

Target

SMT20200616.exe
Size

311KB
MD5

9eda8430e6bf0bab3f1e7134b584cd1b
SHA1

03b3d3d673686f0bd4316bd99c0a135e6e3250ba
SHA256

1c22bad3a6eb408ec1f4d6ef50b04e2294a77979abc411f9dbb752e2b495345b
SHA512

6ad03fb677542c246814976b473d033c743d0cee598139f96cd91e1c0fb958bc0dba5ad712b9fc61c72df09fcdf1b762ef0ae77f5692d6b7f1252935eb40cf78

Score

10^/10

formbook persistence rat rezer0 spyware stealer trojan

Malware Config

Extracted

Family

formbook

C2

http://www.sudelt.com/rk3/

Decoy

cedarridgerussellterriers.com

zamperl-couture.com

8minutesprofitlink.com

yuyinyue.net

castleminerforum.com

habbodm.biz

tektlc.life

strive2thriveglobal.com

richen8.com

ettlingen.digital

clairegoals.com

clearptsd.biz

wxqingtai.com

matttoken.com

macopride.com

hudong.ltd

wirelessantalya.com

connectlibrary.com

ourtime.site

vitalitymax.life

Signatures

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

Formbook Payload 3 IoCs

rat

Processes:

resource	yara_rule
behavioral2/memory/4008-11-0x000000000041E300-mapping.dmp	formbook
behavioral2/memory/4008-10-0x0000000000400000-0x000000000042D000-memory.dmp	formbook
behavioral2/memory/1528-12-0x0000000000000000-mapping.dmp	formbook

rezer0 1 IoCs

Detects ReZer0, a packer with multiple versions used in various campaigns.

rezer0

Processes:

resource	yara_rule
behavioral2/memory/580-8-0x0000000005C70000-0x0000000005CA4000-memory.dmp	rezer0

Adds policy Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

chkdsk.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	chkdsk.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\YBKPD4THR6A = "C:\\Program Files (x86)\\Ggrl0wdz\\izbx1brhtxl.exe"	chkdsk.exe

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

Data from Local System
T1005

Credentials in Files
T1081

Suspicious use of SetThreadContext 4 IoCs

Processes:

SMT20200616.exeSMT20200616.exechkdsk.exe

description	pid	process	target process
PID 580 set thread context of 4008	580	SMT20200616.exe	SMT20200616.exe
PID 4008 set thread context of 3040	4008	SMT20200616.exe	Explorer.EXE
PID 4008 set thread context of 3040	4008	SMT20200616.exe	Explorer.EXE
PID 1528 set thread context of 3040	1528	chkdsk.exe	Explorer.EXE

Drops file in Program Files directory 1 IoCs

Processes:

chkdsk.exe

description ioc process

File opened for modification C:\Program Files (x86)\Ggrl0wdz\izbx1brhtxl.exe chkdsk.exe
Enumerates system info in registry 2 TTPs 1 IoCs

Query Registry
T1012

System Information Discovery
T1082

Processes:

chkdsk.exe

description ioc process

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

description	ioc	process
File opened for modification	C:\Program Files (x86)\Ggrl0wdz\izbx1brhtxl.exe	chkdsk.exe

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

Modifies Internet Explorer settings 1 TTPs 1 IoCs

adware spyware

Modify Registry

T1112

Processes:

chkdsk.exe

description	ioc	process
Key created	\Registry\User\S-1-5-21-1985363256-3005190890-1182679451-1000\SOFTWARE\Microsoft\Internet Explorer\IntelliForms\Storage2	chkdsk.exe

Suspicious behavior: EnumeratesProcesses 46 IoCs

Processes:

SMT20200616.exeSMT20200616.exechkdsk.exe

pid	process
580	SMT20200616.exe
580	SMT20200616.exe
580	SMT20200616.exe
580	SMT20200616.exe
4008	SMT20200616.exe
4008	SMT20200616.exe
4008	SMT20200616.exe
4008	SMT20200616.exe
4008	SMT20200616.exe
4008	SMT20200616.exe
1528	chkdsk.exe
1528	chkdsk.exe
1528	chkdsk.exe
1528	chkdsk.exe
1528	chkdsk.exe
1528	chkdsk.exe
1528	chkdsk.exe
1528	chkdsk.exe
1528	chkdsk.exe
1528	chkdsk.exe
1528	chkdsk.exe
1528	chkdsk.exe
1528	chkdsk.exe
1528	chkdsk.exe
1528	chkdsk.exe
1528	chkdsk.exe
1528	chkdsk.exe
1528	chkdsk.exe
1528	chkdsk.exe
1528	chkdsk.exe
1528	chkdsk.exe
1528	chkdsk.exe
1528	chkdsk.exe
1528	chkdsk.exe
1528	chkdsk.exe
1528	chkdsk.exe
1528	chkdsk.exe
1528	chkdsk.exe
1528	chkdsk.exe
1528	chkdsk.exe
1528	chkdsk.exe
1528	chkdsk.exe
1528	chkdsk.exe
1528	chkdsk.exe
1528	chkdsk.exe
1528	chkdsk.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

Explorer.EXE

pid process

3040 Explorer.EXE
Suspicious behavior: MapViewOfSection 8 IoCs

Processes:

SMT20200616.exechkdsk.exe

pid process

4008 SMT20200616.exe
4008 SMT20200616.exe
4008 SMT20200616.exe
4008 SMT20200616.exe
1528 chkdsk.exe
1528 chkdsk.exe
1528 chkdsk.exe
1528 chkdsk.exe

pid	process
3040	Explorer.EXE

pid	process
4008	SMT20200616.exe
4008	SMT20200616.exe
4008	SMT20200616.exe
4008	SMT20200616.exe
1528	chkdsk.exe
1528	chkdsk.exe
1528	chkdsk.exe
1528	chkdsk.exe

Suspicious use of AdjustPrivilegeToken 9 IoCs

Processes:

SMT20200616.exeSMT20200616.exechkdsk.exeExplorer.EXE

description	pid	process
Token: SeDebugPrivilege	580	SMT20200616.exe
Token: SeDebugPrivilege	4008	SMT20200616.exe
Token: SeDebugPrivilege	1528	chkdsk.exe
Token: SeShutdownPrivilege	3040	Explorer.EXE
Token: SeCreatePagefilePrivilege	3040	Explorer.EXE
Token: SeShutdownPrivilege	3040	Explorer.EXE
Token: SeCreatePagefilePrivilege	3040	Explorer.EXE
Token: SeShutdownPrivilege	3040	Explorer.EXE
Token: SeCreatePagefilePrivilege	3040	Explorer.EXE

Suspicious use of UnmapMainImage 1 IoCs

Processes:

Explorer.EXE

pid process

3040 Explorer.EXE

pid	process
3040	Explorer.EXE

Suspicious use of WriteProcessMemory 21 IoCs

Processes:

SMT20200616.exeExplorer.EXEchkdsk.exe

description	pid	process	target process
PID 580 wrote to memory of 2624	580	SMT20200616.exe	SMT20200616.exe
PID 580 wrote to memory of 2624	580	SMT20200616.exe	SMT20200616.exe
PID 580 wrote to memory of 2624	580	SMT20200616.exe	SMT20200616.exe
PID 580 wrote to memory of 2724	580	SMT20200616.exe	SMT20200616.exe
PID 580 wrote to memory of 2724	580	SMT20200616.exe	SMT20200616.exe
PID 580 wrote to memory of 2724	580	SMT20200616.exe	SMT20200616.exe
PID 580 wrote to memory of 4008	580	SMT20200616.exe	SMT20200616.exe
PID 580 wrote to memory of 4008	580	SMT20200616.exe	SMT20200616.exe
PID 580 wrote to memory of 4008	580	SMT20200616.exe	SMT20200616.exe
PID 580 wrote to memory of 4008	580	SMT20200616.exe	SMT20200616.exe
PID 580 wrote to memory of 4008	580	SMT20200616.exe	SMT20200616.exe
PID 580 wrote to memory of 4008	580	SMT20200616.exe	SMT20200616.exe
PID 3040 wrote to memory of 1528	3040	Explorer.EXE	chkdsk.exe
PID 3040 wrote to memory of 1528	3040	Explorer.EXE	chkdsk.exe
PID 3040 wrote to memory of 1528	3040	Explorer.EXE	chkdsk.exe
PID 1528 wrote to memory of 2124	1528	chkdsk.exe	cmd.exe
PID 1528 wrote to memory of 2124	1528	chkdsk.exe	cmd.exe
PID 1528 wrote to memory of 2124	1528	chkdsk.exe	cmd.exe
PID 1528 wrote to memory of 2344	1528	chkdsk.exe	Firefox.exe
PID 1528 wrote to memory of 2344	1528	chkdsk.exe	Firefox.exe
PID 1528 wrote to memory of 2344	1528	chkdsk.exe	Firefox.exe

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of UnmapMainImage
- Suspicious use of WriteProcessMemory
PID:3040

C:\Users\Admin\AppData\Local\Temp\SMT20200616.exe
"C:\Users\Admin\AppData\Local\Temp\SMT20200616.exe"
2⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:580

C:\Users\Admin\AppData\Local\Temp\SMT20200616.exe
"{path}"
3⤵
PID:2624

C:\Users\Admin\AppData\Local\Temp\SMT20200616.exe
"{path}"
3⤵
PID:2724

C:\Users\Admin\AppData\Local\Temp\SMT20200616.exe
"{path}"
3⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
PID:4008

C:\Windows\SysWOW64\chkdsk.exe
"C:\Windows\SysWOW64\chkdsk.exe"
2⤵
- Adds policy Run key to start application
- Suspicious use of SetThreadContext
- Drops file in Program Files directory
- Enumerates system info in registry
- Modifies Internet Explorer settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1528

C:\Windows\SysWOW64\cmd.exe
/c del "C:\Users\Admin\AppData\Local\Temp\SMT20200616.exe"
3⤵
PID:2124

C:\Program Files\Mozilla Firefox\Firefox.exe
"C:\Program Files\Mozilla Firefox\Firefox.exe"
3⤵
PID:2344

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

2

T1112

Credential Access

Credentials in Files

1

T1081

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

memory/580-2-0x0000000073190000-0x000000007387E000-memory.dmp

Filesize
6.9MB

Download
memory/580-3-0x0000000000D50000-0x0000000000D51000-memory.dmp

Filesize
4KB

Download
memory/580-5-0x0000000005700000-0x0000000005701000-memory.dmp

Filesize
4KB

Download
memory/580-6-0x00000000030D0000-0x00000000030DB000-memory.dmp

Filesize
44KB

Download
memory/580-7-0x0000000005840000-0x0000000005841000-memory.dmp

Filesize
4KB

Download
memory/580-8-0x0000000005C70000-0x0000000005CA4000-memory.dmp

Filesize
208KB

Download
memory/580-9-0x00000000062E0000-0x00000000062E1000-memory.dmp

Filesize
4KB

Download
memory/1528-17-0x00000000080F0000-0x0000000008232000-memory.dmp

Filesize
1.3MB

Download
memory/1528-16-0x0000000005D40000-0x0000000005E0C000-memory.dmp

Filesize
816KB

Download
memory/1528-12-0x0000000000000000-mapping.dmp

Download
memory/1528-13-0x0000000000040000-0x000000000004A000-memory.dmp

Filesize
40KB

Download
memory/1528-14-0x0000000000040000-0x000000000004A000-memory.dmp

Filesize
40KB

Download
memory/2124-15-0x0000000000000000-mapping.dmp

Download
memory/2344-18-0x0000000000000000-mapping.dmp

Download
memory/2344-19-0x00007FF615870000-0x00007FF615903000-memory.dmp

Filesize
588KB

Download
memory/2344-20-0x00007FF615870000-0x00007FF615903000-memory.dmp

Filesize
588KB

Download
memory/2344-21-0x00007FF615870000-0x00007FF615903000-memory.dmp

Filesize
588KB

Download
memory/4008-10-0x0000000000400000-0x000000000042D000-memory.dmp

Filesize
180KB

Download
memory/4008-11-0x000000000041E300-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads