formbook | 54167fce5b8273b4a21f9da96c32113ebe3e5831f51aebad3ae1e97d5165f263

General

Target

Payment Advise.xlsx
Size

337KB
MD5

2a2774f89f6ac878975ef5227cc8a92b
SHA1

bfbfd645fed06b7598bfe1f583d0ba04ad943b29
SHA256

54167fce5b8273b4a21f9da96c32113ebe3e5831f51aebad3ae1e97d5165f263
SHA512

58faad098728b89d6e99ee6e240846b04a35047e317791a47905cd2a6117a487e9ae9a6ab6d33d1405c6be4e7cdc71b18c512929c92ed3910b8554ffe13e929d

Score

10^/10

formbook kzk9 rat spyware stealer trojan

Malware Config

Extracted

Family

formbook

Version

4.1

Campaign

kzk9

C2

http://www.yourmajordomo.com/kzk9/

Decoy

tianconghuo.club

1996-page.com

ourtownmax.net

conservativetreehose.com

synth.repair

donnachicacreperia.com

tentfull.com

weapp.download

surfersink.com

gattlebusinessservices.com

sebastian249.com

anhphuc.company

betternatureproducts.net

defroplate.com

seattlesquidsquad.com

polarjob.com

lendingadvantage.com

angelsondope.com

goportjitney.com

tiendagrupojagr.com

Signatures

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

Formbook Payload 4 IoCs

rat

Processes:

resource	yara_rule
behavioral1/memory/1804-77-0x0000000000400000-0x000000000042E000-memory.dmp	formbook
behavioral1/memory/1804-78-0x000000000041EB80-mapping.dmp	formbook
behavioral1/memory/1804-84-0x0000000000400000-0x000000000042E000-memory.dmp	formbook
behavioral1/memory/1664-91-0x0000000000080000-0x00000000000AE000-memory.dmp	formbook

Blocklisted process makes network request 1 IoCs

Processes:

EQNEDT32.EXE

flow pid process

5 1528 EQNEDT32.EXE
Downloads MZ/PE file
Executes dropped EXE 2 IoCs

Processes:

vbc.exevbc.exe

pid process

1560 vbc.exe
1804 vbc.exe
Loads dropped DLL 4 IoCs

Processes:

EQNEDT32.EXE

pid process

1528 EQNEDT32.EXE
1528 EQNEDT32.EXE
1528 EQNEDT32.EXE
1528 EQNEDT32.EXE
Uses the VBS compiler for execution 1 TTPs

Scripting
T1064

flow	pid	process
5	1528	EQNEDT32.EXE

pid	process
1528	EQNEDT32.EXE
1528	EQNEDT32.EXE
1528	EQNEDT32.EXE
1528	EQNEDT32.EXE

Suspicious use of SetThreadContext 4 IoCs

Processes:

vbc.exevbc.exeraserver.exe

description	pid	process	target process
PID 1560 set thread context of 1804	1560	vbc.exe	vbc.exe
PID 1804 set thread context of 1196	1804	vbc.exe	Explorer.EXE
PID 1804 set thread context of 1196	1804	vbc.exe	Explorer.EXE
PID 1664 set thread context of 1196	1664	raserver.exe	Explorer.EXE

Enumerates system info in registry 2 TTPs 1 IoCs

Query Registry
T1012

System Information Discovery
T1082

Processes:

EXCEL.EXE

description ioc process

Key opened \REGISTRY\MACHINE\Hardware\Description\System\FloatingPointProcessor EXCEL.EXE
Launches Equation Editor 1 TTPs 1 IoCs
Equation Editor is an old Office component often targeted by exploits such as CVE-2017-11882.
exploit

Exploitation for Client Execution
T1203

Processes:

EQNEDT32.EXE

pid process

1528 EQNEDT32.EXE

description	ioc	process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\FloatingPointProcessor	EXCEL.EXE

pid	process
1528	EQNEDT32.EXE

Modifies Internet Explorer settings 1 TTPs 9 IoCs

adware spyware

Modify Registry

T1112

Processes:

EXCEL.EXE

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\Toolbar	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel	EXCEL.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\Contexts = "1"	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\Toolbar\ShowDiscussionButton = "Yes"	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\MenuExt	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\ONBttnIE.dll/105"	EXCEL.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\Contexts = "55"	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\EXCEL.EXE/3000"	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

EXCEL.EXE

pid process

1984 EXCEL.EXE

pid	process
1984	EXCEL.EXE

Suspicious behavior: EnumeratesProcesses 23 IoCs

Processes:

vbc.exevbc.exeraserver.exe

pid	process
1560	vbc.exe
1560	vbc.exe
1560	vbc.exe
1560	vbc.exe
1560	vbc.exe
1560	vbc.exe
1560	vbc.exe
1804	vbc.exe
1804	vbc.exe
1804	vbc.exe
1664	raserver.exe
1664	raserver.exe
1664	raserver.exe
1664	raserver.exe
1664	raserver.exe
1664	raserver.exe
1664	raserver.exe
1664	raserver.exe
1664	raserver.exe
1664	raserver.exe
1664	raserver.exe
1664	raserver.exe
1664	raserver.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

Explorer.EXE

pid process

1196 Explorer.EXE
Suspicious behavior: MapViewOfSection 6 IoCs

Processes:

vbc.exeraserver.exe

pid process

1804 vbc.exe
1804 vbc.exe
1804 vbc.exe
1804 vbc.exe
1664 raserver.exe
1664 raserver.exe

pid	process
1196	Explorer.EXE

pid	process
1804	vbc.exe
1804	vbc.exe
1804	vbc.exe
1804	vbc.exe
1664	raserver.exe
1664	raserver.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

Processes:

vbc.exevbc.exeraserver.exeExplorer.EXE

description	pid	process
Token: SeDebugPrivilege	1560	vbc.exe
Token: SeDebugPrivilege	1804	vbc.exe
Token: SeDebugPrivilege	1664	raserver.exe
Token: SeShutdownPrivilege	1196	Explorer.EXE
Token: SeShutdownPrivilege	1196	Explorer.EXE
Token: SeShutdownPrivilege	1196	Explorer.EXE
Token: SeShutdownPrivilege	1196	Explorer.EXE
Token: SeShutdownPrivilege	1196	Explorer.EXE

Suspicious use of SetWindowsHookEx 3 IoCs

Processes:

EXCEL.EXE

pid process

1984 EXCEL.EXE
1984 EXCEL.EXE
1984 EXCEL.EXE

pid	process
1984	EXCEL.EXE
1984	EXCEL.EXE
1984	EXCEL.EXE

Suspicious use of WriteProcessMemory 19 IoCs

Processes:

EQNEDT32.EXEvbc.exevbc.exeraserver.exe

description	pid	process	target process
PID 1528 wrote to memory of 1560	1528	EQNEDT32.EXE	vbc.exe
PID 1528 wrote to memory of 1560	1528	EQNEDT32.EXE	vbc.exe
PID 1528 wrote to memory of 1560	1528	EQNEDT32.EXE	vbc.exe
PID 1528 wrote to memory of 1560	1528	EQNEDT32.EXE	vbc.exe
PID 1560 wrote to memory of 1804	1560	vbc.exe	vbc.exe
PID 1560 wrote to memory of 1804	1560	vbc.exe	vbc.exe
PID 1560 wrote to memory of 1804	1560	vbc.exe	vbc.exe
PID 1560 wrote to memory of 1804	1560	vbc.exe	vbc.exe
PID 1560 wrote to memory of 1804	1560	vbc.exe	vbc.exe
PID 1560 wrote to memory of 1804	1560	vbc.exe	vbc.exe
PID 1560 wrote to memory of 1804	1560	vbc.exe	vbc.exe
PID 1804 wrote to memory of 1664	1804	vbc.exe	raserver.exe
PID 1804 wrote to memory of 1664	1804	vbc.exe	raserver.exe
PID 1804 wrote to memory of 1664	1804	vbc.exe	raserver.exe
PID 1804 wrote to memory of 1664	1804	vbc.exe	raserver.exe
PID 1664 wrote to memory of 324	1664	raserver.exe	cmd.exe
PID 1664 wrote to memory of 324	1664	raserver.exe	cmd.exe
PID 1664 wrote to memory of 324	1664	raserver.exe	cmd.exe
PID 1664 wrote to memory of 324	1664	raserver.exe	cmd.exe

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
PID:1196

C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE
"C:\Program Files (x86)\Microsoft Office\Office14\EXCEL.EXE" /dde "C:\Users\Admin\AppData\Local\Temp\Payment Advise.xlsx"
2⤵
- Enumerates system info in registry
- Modifies Internet Explorer settings
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
PID:1984

C:\Windows\SysWOW64\autoconv.exe
"C:\Windows\SysWOW64\autoconv.exe"
2⤵
PID:980

C:\Windows\SysWOW64\autofmt.exe
"C:\Windows\SysWOW64\autofmt.exe"
2⤵
PID:1736

C:\Windows\SysWOW64\autofmt.exe
"C:\Windows\SysWOW64\autofmt.exe"
2⤵
PID:1372

C:\Windows\SysWOW64\autofmt.exe
"C:\Windows\SysWOW64\autofmt.exe"
2⤵
PID:348

C:\Windows\SysWOW64\autofmt.exe
"C:\Windows\SysWOW64\autofmt.exe"
2⤵
PID:1964

C:\Windows\SysWOW64\autofmt.exe
"C:\Windows\SysWOW64\autofmt.exe"
2⤵
PID:1684

C:\Windows\SysWOW64\autofmt.exe
"C:\Windows\SysWOW64\autofmt.exe"
2⤵
PID:908

C:\Windows\SysWOW64\autofmt.exe
"C:\Windows\SysWOW64\autofmt.exe"
2⤵
PID:1508

C:\Windows\SysWOW64\autofmt.exe
"C:\Windows\SysWOW64\autofmt.exe"
2⤵
PID:1836

C:\Windows\SysWOW64\autofmt.exe
"C:\Windows\SysWOW64\autofmt.exe"
2⤵
PID:1812

C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE
"C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE" -Embedding
1⤵
- Blocklisted process makes network request
- Loads dropped DLL
- Launches Equation Editor
- Suspicious use of WriteProcessMemory
PID:1528

C:\Users\Public\vbc.exe
"C:\Users\Public\vbc.exe"
2⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1560

C:\Users\Public\vbc.exe
"C:\Users\Public\vbc.exe"
3⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1804

C:\Windows\SysWOW64\raserver.exe
"C:\Windows\SysWOW64\raserver.exe"
4⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1664

C:\Windows\SysWOW64\cmd.exe
/c del "C:\Users\Public\vbc.exe"
5⤵
PID:324

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scripting

1

T1064

Exploitation for Client Execution

1

T1203

Persistence

Privilege Escalation

Defense Evasion

Scripting

1

T1064

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Public\vbc.exe
MD5
1fe73fe4d37cae6a02262b5164f3def0

SHA1
80b03eb27651723bded1fd1425f489225b3bba3b

SHA256
0c33fe39195569a868cf9f87d3aff16e72f5a54c4e52a852b8f986d121fa47e8

SHA512
7416dadb6e85cc43000bba33f47797cf7e5fe5ee0c9f8639685130264a867b6048839d2b74ca3e00b00caf8a1dcf83d08f01901c56ab9343888d62501c48d2b6

Download Submit
C:\Users\Public\vbc.exe
MD5
1fe73fe4d37cae6a02262b5164f3def0

SHA1
80b03eb27651723bded1fd1425f489225b3bba3b

SHA256
0c33fe39195569a868cf9f87d3aff16e72f5a54c4e52a852b8f986d121fa47e8

SHA512
7416dadb6e85cc43000bba33f47797cf7e5fe5ee0c9f8639685130264a867b6048839d2b74ca3e00b00caf8a1dcf83d08f01901c56ab9343888d62501c48d2b6

Download Submit
C:\Users\Public\vbc.exe
MD5
1fe73fe4d37cae6a02262b5164f3def0

SHA1
80b03eb27651723bded1fd1425f489225b3bba3b

SHA256
0c33fe39195569a868cf9f87d3aff16e72f5a54c4e52a852b8f986d121fa47e8

SHA512
7416dadb6e85cc43000bba33f47797cf7e5fe5ee0c9f8639685130264a867b6048839d2b74ca3e00b00caf8a1dcf83d08f01901c56ab9343888d62501c48d2b6

Download Submit
\Users\Public\vbc.exe
MD5
1fe73fe4d37cae6a02262b5164f3def0

SHA1
80b03eb27651723bded1fd1425f489225b3bba3b

SHA256
0c33fe39195569a868cf9f87d3aff16e72f5a54c4e52a852b8f986d121fa47e8

SHA512
7416dadb6e85cc43000bba33f47797cf7e5fe5ee0c9f8639685130264a867b6048839d2b74ca3e00b00caf8a1dcf83d08f01901c56ab9343888d62501c48d2b6

Download Submit
\Users\Public\vbc.exe
MD5
1fe73fe4d37cae6a02262b5164f3def0

SHA1
80b03eb27651723bded1fd1425f489225b3bba3b

SHA256
0c33fe39195569a868cf9f87d3aff16e72f5a54c4e52a852b8f986d121fa47e8

SHA512
7416dadb6e85cc43000bba33f47797cf7e5fe5ee0c9f8639685130264a867b6048839d2b74ca3e00b00caf8a1dcf83d08f01901c56ab9343888d62501c48d2b6

Download Submit
\Users\Public\vbc.exe
MD5
1fe73fe4d37cae6a02262b5164f3def0

SHA1
80b03eb27651723bded1fd1425f489225b3bba3b

SHA256
0c33fe39195569a868cf9f87d3aff16e72f5a54c4e52a852b8f986d121fa47e8

SHA512
7416dadb6e85cc43000bba33f47797cf7e5fe5ee0c9f8639685130264a867b6048839d2b74ca3e00b00caf8a1dcf83d08f01901c56ab9343888d62501c48d2b6

Download Submit
\Users\Public\vbc.exe
MD5
1fe73fe4d37cae6a02262b5164f3def0

SHA1
80b03eb27651723bded1fd1425f489225b3bba3b

SHA256
0c33fe39195569a868cf9f87d3aff16e72f5a54c4e52a852b8f986d121fa47e8

SHA512
7416dadb6e85cc43000bba33f47797cf7e5fe5ee0c9f8639685130264a867b6048839d2b74ca3e00b00caf8a1dcf83d08f01901c56ab9343888d62501c48d2b6

Download Submit
memory/324-89-0x0000000000000000-mapping.dmp

Download
memory/1196-95-0x0000000006D20000-0x0000000006EA0000-memory.dmp

Filesize
1.5MB

Download
memory/1196-86-0x0000000004A30000-0x0000000004B22000-memory.dmp

Filesize
968KB

Download
memory/1196-82-0x0000000006490000-0x00000000065AB000-memory.dmp

Filesize
1.1MB

Download
memory/1528-62-0x0000000075AD1000-0x0000000075AD3000-memory.dmp

Filesize
8KB

Download
memory/1560-67-0x0000000000000000-mapping.dmp

Download
memory/1560-74-0x00000000050D0000-0x0000000005120000-memory.dmp

Filesize
320KB

Download
memory/1560-73-0x0000000000330000-0x0000000000335000-memory.dmp

Filesize
20KB

Download
memory/1560-72-0x0000000004C60000-0x0000000004C61000-memory.dmp

Filesize
4KB

Download
memory/1560-70-0x0000000000AA0000-0x0000000000AA1000-memory.dmp

Filesize
4KB

Download
memory/1664-87-0x0000000000000000-mapping.dmp

Download
memory/1664-93-0x0000000000840000-0x00000000008D3000-memory.dmp

Filesize
588KB

Download
memory/1664-90-0x0000000000C90000-0x0000000000CAC000-memory.dmp

Filesize
112KB

Download
memory/1664-92-0x00000000020B0000-0x00000000023B3000-memory.dmp

Filesize
3.0MB

Download
memory/1664-91-0x0000000000080000-0x00000000000AE000-memory.dmp

Filesize
184KB

Download
memory/1804-78-0x000000000041EB80-mapping.dmp

Download
memory/1804-84-0x0000000000400000-0x000000000042E000-memory.dmp

Filesize
184KB

Download
memory/1804-85-0x00000000001D0000-0x00000000001E4000-memory.dmp

Filesize
80KB

Download
memory/1804-83-0x0000000000180000-0x0000000000194000-memory.dmp

Filesize
80KB

Download
memory/1804-81-0x0000000000B20000-0x0000000000E23000-memory.dmp

Filesize
3.0MB

Download
memory/1804-77-0x0000000000400000-0x000000000042E000-memory.dmp

Filesize
184KB

Download
memory/1804-76-0x0000000000400000-0x000000000042E000-memory.dmp

Filesize
184KB

Download
memory/1804-75-0x0000000000400000-0x000000000042E000-memory.dmp

Filesize
184KB

Download
memory/1984-59-0x000000002FFB1000-0x000000002FFB4000-memory.dmp

Filesize
12KB

Download
memory/1984-61-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/1984-94-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/1984-60-0x0000000070FD1000-0x0000000070FD3000-memory.dmp

Filesize
8KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads