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
behavioral2/memory/1160-129-0x0000000000400000-0x000000000042E000-memory.dmp	formbook
behavioral2/memory/1160-130-0x000000000041EAF0-mapping.dmp	formbook
behavioral2/memory/2120-137-0x0000000000AC0000-0x0000000000AEE000-memory.dmp	formbook

Suspicious use of SetThreadContext 3 IoCs

Processes:

invoice.lzh.exeinvoice.lzh.exeraserver.exe

description	pid	process	target process
PID 632 set thread context of 1160	632	invoice.lzh.exe	invoice.lzh.exe
PID 1160 set thread context of 2428	1160	invoice.lzh.exe	Explorer.EXE
PID 2120 set thread context of 2428	2120	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

2940 schtasks.exe

pid	process
2940	schtasks.exe

Suspicious behavior: EnumeratesProcesses 47 IoCs

Processes:

invoice.lzh.exeinvoice.lzh.exeraserver.exe

pid	process
632	invoice.lzh.exe
1160	invoice.lzh.exe
1160	invoice.lzh.exe
1160	invoice.lzh.exe
1160	invoice.lzh.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe
2120	raserver.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

Explorer.EXE

pid process

2428 Explorer.EXE
Suspicious behavior: MapViewOfSection 5 IoCs

Processes:

invoice.lzh.exeraserver.exe

pid process

1160 invoice.lzh.exe
1160 invoice.lzh.exe
1160 invoice.lzh.exe
2120 raserver.exe
2120 raserver.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

invoice.lzh.exeinvoice.lzh.exeraserver.exe

description pid process

Token: SeDebugPrivilege 632 invoice.lzh.exe
Token: SeDebugPrivilege 1160 invoice.lzh.exe
Token: SeDebugPrivilege 2120 raserver.exe
Suspicious use of UnmapMainImage 1 IoCs

Processes:

Explorer.EXE

pid process

2428 Explorer.EXE

pid	process
2428	Explorer.EXE

pid	process
1160	invoice.lzh.exe
1160	invoice.lzh.exe
1160	invoice.lzh.exe
2120	raserver.exe
2120	raserver.exe

description	pid	process
Token: SeDebugPrivilege	632	invoice.lzh.exe
Token: SeDebugPrivilege	1160	invoice.lzh.exe
Token: SeDebugPrivilege	2120	raserver.exe

pid	process
2428	Explorer.EXE

Suspicious use of WriteProcessMemory 15 IoCs

Processes:

invoice.lzh.exeExplorer.EXEraserver.exe

description	pid	process	target process
PID 632 wrote to memory of 2940	632	invoice.lzh.exe	schtasks.exe
PID 632 wrote to memory of 2940	632	invoice.lzh.exe	schtasks.exe
PID 632 wrote to memory of 2940	632	invoice.lzh.exe	schtasks.exe
PID 632 wrote to memory of 1160	632	invoice.lzh.exe	invoice.lzh.exe
PID 632 wrote to memory of 1160	632	invoice.lzh.exe	invoice.lzh.exe
PID 632 wrote to memory of 1160	632	invoice.lzh.exe	invoice.lzh.exe
PID 632 wrote to memory of 1160	632	invoice.lzh.exe	invoice.lzh.exe
PID 632 wrote to memory of 1160	632	invoice.lzh.exe	invoice.lzh.exe
PID 632 wrote to memory of 1160	632	invoice.lzh.exe	invoice.lzh.exe
PID 2428 wrote to memory of 2120	2428	Explorer.EXE	raserver.exe
PID 2428 wrote to memory of 2120	2428	Explorer.EXE	raserver.exe
PID 2428 wrote to memory of 2120	2428	Explorer.EXE	raserver.exe
PID 2120 wrote to memory of 2188	2120	raserver.exe	cmd.exe
PID 2120 wrote to memory of 2188	2120	raserver.exe	cmd.exe
PID 2120 wrote to memory of 2188	2120	raserver.exe	cmd.exe

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of UnmapMainImage
- Suspicious use of WriteProcessMemory
PID:2428

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:632

C:\Windows\SysWOW64\schtasks.exe
"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\HPjuSZknbJLLSG" /XML "C:\Users\Admin\AppData\Local\Temp\tmp47D7.tmp"
3⤵
- Creates scheduled task(s)
PID:2940

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:1160

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:2120

C:\Windows\SysWOW64\cmd.exe
/c del "C:\Users\Admin\AppData\Local\Temp\invoice.lzh.exe"
3⤵
PID:2188

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\tmp47D7.tmp
MD5
0937496bb1581c7211066f8080084965

SHA1
1becb26c71f9202394715abc66122cd841189aa6

SHA256
57e3987d3eb4401213c508df574dd57c78848d3014ba233d7ee92653f756ad78

SHA512
eb5036cc052571b4b861ca4cb994d34aa677183c139be5ca96d5e1c837e9c7470dec240f1e520d9abde626ac09a3c3f4252dea44bba912de1f23e6941f7d19c4

Download Submit
memory/632-125-0x00000000058B0000-0x0000000005939000-memory.dmp

Filesize
548KB

Download
memory/632-118-0x000000000A710000-0x000000000A711000-memory.dmp

Filesize
4KB

Download
memory/632-126-0x0000000005820000-0x0000000005859000-memory.dmp

Filesize
228KB

Download
memory/632-119-0x0000000002C70000-0x0000000002C71000-memory.dmp

Filesize
4KB

Download
memory/632-120-0x0000000005280000-0x0000000005281000-memory.dmp

Filesize
4KB

Download
memory/632-121-0x0000000005283000-0x0000000005285000-memory.dmp

Filesize
8KB

Download
memory/632-122-0x000000000EA90000-0x000000000EA91000-memory.dmp

Filesize
4KB

Download
memory/632-123-0x0000000005390000-0x0000000005392000-memory.dmp

Filesize
8KB

Download
memory/632-116-0x00000000051F0000-0x0000000005256000-memory.dmp

Filesize
408KB

Download
memory/632-114-0x0000000000920000-0x0000000000921000-memory.dmp

Filesize
4KB

Download
memory/632-124-0x0000000005440000-0x0000000005441000-memory.dmp

Filesize
4KB

Download
memory/632-117-0x000000000AC10000-0x000000000AC11000-memory.dmp

Filesize
4KB

Download
memory/1160-129-0x0000000000400000-0x000000000042E000-memory.dmp

Filesize
184KB

Download
memory/1160-130-0x000000000041EAF0-mapping.dmp

Download
memory/1160-132-0x0000000001250000-0x0000000001264000-memory.dmp

Filesize
80KB

Download
memory/1160-131-0x0000000001310000-0x0000000001630000-memory.dmp

Filesize
3.1MB

Download
memory/2120-137-0x0000000000AC0000-0x0000000000AEE000-memory.dmp

Filesize
184KB

Download
memory/2120-138-0x0000000004A50000-0x0000000004D70000-memory.dmp

Filesize
3.1MB

Download
memory/2120-134-0x0000000000000000-mapping.dmp

Download
memory/2120-136-0x0000000001160000-0x000000000117F000-memory.dmp

Filesize
124KB

Download
memory/2120-139-0x0000000004940000-0x00000000049D3000-memory.dmp

Filesize
588KB

Download
memory/2188-135-0x0000000000000000-mapping.dmp

Download
memory/2428-133-0x0000000005E10000-0x0000000005F15000-memory.dmp

Filesize
1.0MB

Download
memory/2428-140-0x0000000005F20000-0x00000000060AA000-memory.dmp

Filesize
1.5MB

Download
memory/2940-127-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads