formbook | b506bb786b2b45d252f9886ad94e63cb60b60544dade0680b096f80c84cada7a

General

Target

invoice.lzh.exe
Size

530KB
MD5

d8135073743eead59a3ecde61bf051ca
SHA1

11a89d02e31a429b48295da8cd1c760a7ceae38d
SHA256

b506bb786b2b45d252f9886ad94e63cb60b60544dade0680b096f80c84cada7a
SHA512

15fe12c916712fab35377a7459da35624b5ed3d218c0bb7beab17a932a1883a333e0679122ce70130278d34dba9fc2d2033c8cec4024646bd73ab8702b28210b

Score

10^/10

formbook rat spyware stealer suricata trojan

Malware Config

Extracted

Family

formbook

Version

4.1

C2

http://www.knighttechinca.com/dxe/

Decoy

sardarfarm.com

959tremont.com

privat-livecam.net

ansel-homebakery.com

joysupermarket.com

peninsulamatchmakers.net

northsytyle.com

radioconexaoubermusic.com

relocatingrealtor.com

desyrnan.com

onlinehoortoestel.online

enpointe.online

rvvikings.com

paulpoirier.com

shitarpa.net

kerneis.net

rokitreach.com

essentiallygaia.com

prestiged.net

fuerzaagavera.com

Signatures

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

Formbook Payload 3 IoCs

rat

Processes:

resource	yara_rule
behavioral1/memory/900-70-0x0000000000400000-0x000000000042E000-memory.dmp	formbook
behavioral1/memory/900-71-0x000000000041EAF0-mapping.dmp	formbook
behavioral1/memory/1852-79-0x0000000000080000-0x00000000000AE000-memory.dmp	formbook

Deletes itself 1 IoCs

Processes:

cmd.exe

pid process

1328 cmd.exe

pid	process
1328	cmd.exe

Suspicious use of SetThreadContext 3 IoCs

Processes:

invoice.lzh.exeinvoice.lzh.exeraserver.exe

description	pid	process	target process
PID 1348 set thread context of 900	1348	invoice.lzh.exe	invoice.lzh.exe
PID 900 set thread context of 1220	900	invoice.lzh.exe	Explorer.EXE
PID 1852 set thread context of 1220	1852	raserver.exe	Explorer.EXE

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task
T1053

Processes:

schtasks.exe

pid process

1132 schtasks.exe

pid	process
1132	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

Processes:

invoice.lzh.exeinvoice.lzh.exeraserver.exe

pid	process
1348	invoice.lzh.exe
900	invoice.lzh.exe
900	invoice.lzh.exe
1852	raserver.exe
1852	raserver.exe
1852	raserver.exe
1852	raserver.exe
1852	raserver.exe
1852	raserver.exe
1852	raserver.exe
1852	raserver.exe
1852	raserver.exe
1852	raserver.exe
1852	raserver.exe
1852	raserver.exe
1852	raserver.exe
1852	raserver.exe
1852	raserver.exe
1852	raserver.exe
1852	raserver.exe
1852	raserver.exe
1852	raserver.exe
1852	raserver.exe

Suspicious behavior: MapViewOfSection 5 IoCs

Processes:

invoice.lzh.exeraserver.exe

pid process

900 invoice.lzh.exe
900 invoice.lzh.exe
900 invoice.lzh.exe
1852 raserver.exe
1852 raserver.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

invoice.lzh.exeinvoice.lzh.exeraserver.exe

description pid process

Token: SeDebugPrivilege 1348 invoice.lzh.exe
Token: SeDebugPrivilege 900 invoice.lzh.exe
Token: SeDebugPrivilege 1852 raserver.exe
Suspicious use of FindShellTrayWindow 4 IoCs

Processes:

Explorer.EXE

pid process

1220 Explorer.EXE
1220 Explorer.EXE
1220 Explorer.EXE
1220 Explorer.EXE
Suspicious use of SendNotifyMessage 4 IoCs

Processes:

Explorer.EXE

pid process

1220 Explorer.EXE
1220 Explorer.EXE
1220 Explorer.EXE
1220 Explorer.EXE

pid	process
900	invoice.lzh.exe
900	invoice.lzh.exe
900	invoice.lzh.exe
1852	raserver.exe
1852	raserver.exe

description	pid	process
Token: SeDebugPrivilege	1348	invoice.lzh.exe
Token: SeDebugPrivilege	900	invoice.lzh.exe
Token: SeDebugPrivilege	1852	raserver.exe

pid	process
1220	Explorer.EXE
1220	Explorer.EXE
1220	Explorer.EXE
1220	Explorer.EXE

pid	process
1220	Explorer.EXE
1220	Explorer.EXE
1220	Explorer.EXE
1220	Explorer.EXE

Suspicious use of WriteProcessMemory 19 IoCs

Processes:

invoice.lzh.exeExplorer.EXEraserver.exe

description	pid	process	target process
PID 1348 wrote to memory of 1132	1348	invoice.lzh.exe	schtasks.exe
PID 1348 wrote to memory of 1132	1348	invoice.lzh.exe	schtasks.exe
PID 1348 wrote to memory of 1132	1348	invoice.lzh.exe	schtasks.exe
PID 1348 wrote to memory of 1132	1348	invoice.lzh.exe	schtasks.exe
PID 1348 wrote to memory of 900	1348	invoice.lzh.exe	invoice.lzh.exe
PID 1348 wrote to memory of 900	1348	invoice.lzh.exe	invoice.lzh.exe
PID 1348 wrote to memory of 900	1348	invoice.lzh.exe	invoice.lzh.exe
PID 1348 wrote to memory of 900	1348	invoice.lzh.exe	invoice.lzh.exe
PID 1348 wrote to memory of 900	1348	invoice.lzh.exe	invoice.lzh.exe
PID 1348 wrote to memory of 900	1348	invoice.lzh.exe	invoice.lzh.exe
PID 1348 wrote to memory of 900	1348	invoice.lzh.exe	invoice.lzh.exe
PID 1220 wrote to memory of 1852	1220	Explorer.EXE	raserver.exe
PID 1220 wrote to memory of 1852	1220	Explorer.EXE	raserver.exe
PID 1220 wrote to memory of 1852	1220	Explorer.EXE	raserver.exe
PID 1220 wrote to memory of 1852	1220	Explorer.EXE	raserver.exe
PID 1852 wrote to memory of 1328	1852	raserver.exe	cmd.exe
PID 1852 wrote to memory of 1328	1852	raserver.exe	cmd.exe
PID 1852 wrote to memory of 1328	1852	raserver.exe	cmd.exe
PID 1852 wrote to memory of 1328	1852	raserver.exe	cmd.exe

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:1220

C:\Users\Admin\AppData\Local\Temp\invoice.lzh.exe
"C:\Users\Admin\AppData\Local\Temp\invoice.lzh.exe"
2⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1348

C:\Windows\SysWOW64\schtasks.exe
"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\HPjuSZknbJLLSG" /XML "C:\Users\Admin\AppData\Local\Temp\tmp44AE.tmp"
3⤵
- Creates scheduled task(s)
PID:1132

C:\Users\Admin\AppData\Local\Temp\invoice.lzh.exe
"{path}"
3⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
PID:900

C:\Windows\SysWOW64\raserver.exe
"C:\Windows\SysWOW64\raserver.exe"
2⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1852

C:\Windows\SysWOW64\cmd.exe
/c del "C:\Users\Admin\AppData\Local\Temp\invoice.lzh.exe"
3⤵
- Deletes itself
PID:1328

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmp44AE.tmp
MD5
91e026ee4c37f75e2b82b11583fb01c4

SHA1
a8481000baebe3329cae20cea551437fa3d91a26

SHA256
c5b681c1808c6d7e08898f987efe9cdcf2242fc59c019c74bd6b53e68780599c

SHA512
0d53b4614db00e1053c44baec190626ebefd39d059759f8c768d5374a7174875a9387e71768d1599e5d305394b71c7b70692cfc35c2f6edd128164d2685e0436

Download Submit
memory/900-70-0x0000000000400000-0x000000000042E000-memory.dmp

Filesize
184KB

Download
memory/900-73-0x00000000001D0000-0x00000000001E4000-memory.dmp

Filesize
80KB

Download
memory/900-72-0x00000000009C0000-0x0000000000CC3000-memory.dmp

Filesize
3.0MB

Download
memory/900-71-0x000000000041EAF0-mapping.dmp

Download
memory/1132-68-0x0000000000000000-mapping.dmp

Download
memory/1220-82-0x0000000003EB0000-0x0000000003F61000-memory.dmp

Filesize
708KB

Download
memory/1220-74-0x00000000062C0000-0x0000000006454000-memory.dmp

Filesize
1.6MB

Download
memory/1328-77-0x0000000000000000-mapping.dmp

Download
memory/1348-66-0x0000000004A70000-0x0000000004AF9000-memory.dmp

Filesize
548KB

Download
memory/1348-67-0x0000000001F90000-0x0000000001FC9000-memory.dmp

Filesize
228KB

Download
memory/1348-60-0x0000000010F20000-0x0000000010F21000-memory.dmp

Filesize
4KB

Download
memory/1348-65-0x0000000004A35000-0x0000000004A46000-memory.dmp

Filesize
68KB

Download
memory/1348-64-0x0000000000380000-0x0000000000382000-memory.dmp

Filesize
8KB

Download
memory/1348-63-0x0000000004A30000-0x0000000004A31000-memory.dmp

Filesize
4KB

Download
memory/1348-62-0x00000000006D0000-0x0000000000736000-memory.dmp

Filesize
408KB

Download
memory/1852-75-0x0000000000000000-mapping.dmp

Download
memory/1852-76-0x00000000762C1000-0x00000000762C3000-memory.dmp

Filesize
8KB

Download
memory/1852-78-0x00000000001C0000-0x00000000001DC000-memory.dmp

Filesize
112KB

Download
memory/1852-79-0x0000000000080000-0x00000000000AE000-memory.dmp

Filesize
184KB

Download
memory/1852-80-0x0000000001EF0000-0x00000000021F3000-memory.dmp

Filesize
3.0MB

Download
memory/1852-81-0x0000000001DC0000-0x0000000001E53000-memory.dmp

Filesize
588KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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