formbook | 7912137590e4d0a4bcd3fdb006b37ba59aad20e6c27db10618f165870f817128

General

Target

INV2021-20800.docx
Size

10KB
MD5

c8c485325d6cc53942722aa48c280d4f
SHA1

61b8fd6e92c390481e4a2386e87bc9437896af53
SHA256

7912137590e4d0a4bcd3fdb006b37ba59aad20e6c27db10618f165870f817128
SHA512

d68f8ce4ed8e7133451a5bd55b5283129f671d38076382284332a4928f8ca58935410bf0fa09ce8ad7c7ba681add0445747f9056a0e0efb438b90f83ab826e9c

Score

10^/10

formbook rat spyware stealer trojan

Malware Config

Extracted

Family

formbook

Version

4.1

C2

http://www.rocketschool.net/nf2/

Decoy

avlholisticdentalcare.com

coolermassmedia.com

anythingneverything.net

maimaixiu.club

veyconcorp.com

rplelectro.com

koch-mannes.club

tecknetpro.com

getresurface.net

mertzengin.com

nbppfanzgn.com

508hill.com

ourdailydelights.com

aimeesambayan.com

productstoredt.com

doublelblonghorns.com

lucidcurriculum.com

thegoddessnow.com

qywqmjku.icu

yonibymina.com

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
behavioral1/memory/760-78-0x0000000000400000-0x000000000042E000-memory.dmp	formbook
behavioral1/memory/760-79-0x000000000041EB30-mapping.dmp	formbook
behavioral1/memory/1816-88-0x00000000000D0000-0x00000000000FE000-memory.dmp	formbook

Blocklisted process makes network request 1 IoCs

Processes:

EQNEDT32.EXE

flow pid process

14 512 EQNEDT32.EXE
Downloads MZ/PE file
Executes dropped EXE 2 IoCs

Processes:

vbc.exevbc.exe

pid process

960 vbc.exe
760 vbc.exe

flow	pid	process
14	512	EQNEDT32.EXE

Abuses OpenXML format to download file from external location 2 IoCs

Processes:

WINWORD.EXE

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\Toolbar	WINWORD.EXE
Key opened	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Office\Common\Offline\Files\https://itsssl.com/TyPzK	WINWORD.EXE

Loads dropped DLL 4 IoCs

Processes:

EQNEDT32.EXE

pid process

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

Scripting
T1064

pid	process
512	EQNEDT32.EXE
512	EQNEDT32.EXE
512	EQNEDT32.EXE
512	EQNEDT32.EXE

Suspicious use of SetThreadContext 3 IoCs

Processes:

vbc.exevbc.exewuapp.exe

description	pid	process	target process
PID 960 set thread context of 760	960	vbc.exe	vbc.exe
PID 760 set thread context of 1208	760	vbc.exe	Explorer.EXE
PID 1816 set thread context of 1208	1816	wuapp.exe	Explorer.EXE

Drops file in Windows directory 1 IoCs

Processes:

WINWORD.EXE

description ioc process

File opened for modification C:\Windows\Debug\WIA\wiatrace.log WINWORD.EXE
Office loads VBA resources, possible macro or embedded object present
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

512 EQNEDT32.EXE

description	ioc	process
File opened for modification	C:\Windows\Debug\WIA\wiatrace.log	WINWORD.EXE

pid	process
512	EQNEDT32.EXE

Modifies Internet Explorer settings 1 TTPs 9 IoCs

adware spyware

Modify Registry

T1112

Processes:

WINWORD.EXE

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\Toolbar	WINWORD.EXE
Key created	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote	WINWORD.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\ONBttnIE.dll/105"	WINWORD.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\Contexts = "55"	WINWORD.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\Toolbar\ShowDiscussionButton = "Yes"	WINWORD.EXE
Key created	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt	WINWORD.EXE
Key created	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel	WINWORD.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\EXCEL.EXE/3000"	WINWORD.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\Contexts = "1"	WINWORD.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

WINWORD.EXE

pid process

1656 WINWORD.EXE

pid	process
1656	WINWORD.EXE

Suspicious behavior: EnumeratesProcesses 17 IoCs

Processes:

vbc.exevbc.exewuapp.exe

pid	process
960	vbc.exe
760	vbc.exe
760	vbc.exe
1816	wuapp.exe
1816	wuapp.exe
1816	wuapp.exe
1816	wuapp.exe
1816	wuapp.exe
1816	wuapp.exe
1816	wuapp.exe
1816	wuapp.exe
1816	wuapp.exe
1816	wuapp.exe
1816	wuapp.exe
1816	wuapp.exe
1816	wuapp.exe
1816	wuapp.exe

Suspicious behavior: MapViewOfSection 5 IoCs

Processes:

vbc.exewuapp.exe

pid process

760 vbc.exe
760 vbc.exe
760 vbc.exe
1816 wuapp.exe
1816 wuapp.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

vbc.exevbc.exewuapp.exe

description pid process

Token: SeDebugPrivilege 960 vbc.exe
Token: SeDebugPrivilege 760 vbc.exe
Token: SeDebugPrivilege 1816 wuapp.exe
Suspicious use of SetWindowsHookEx 2 IoCs

Processes:

WINWORD.EXE

pid process

1656 WINWORD.EXE
1656 WINWORD.EXE

pid	process
760	vbc.exe
760	vbc.exe
760	vbc.exe
1816	wuapp.exe
1816	wuapp.exe

description	pid	process
Token: SeDebugPrivilege	960	vbc.exe
Token: SeDebugPrivilege	760	vbc.exe
Token: SeDebugPrivilege	1816	wuapp.exe

pid	process
1656	WINWORD.EXE
1656	WINWORD.EXE

Suspicious use of WriteProcessMemory 26 IoCs

Processes:

EQNEDT32.EXEWINWORD.EXEvbc.exeExplorer.EXEwuapp.exe

description	pid	process	target process
PID 512 wrote to memory of 960	512	EQNEDT32.EXE	vbc.exe
PID 512 wrote to memory of 960	512	EQNEDT32.EXE	vbc.exe
PID 512 wrote to memory of 960	512	EQNEDT32.EXE	vbc.exe
PID 512 wrote to memory of 960	512	EQNEDT32.EXE	vbc.exe
PID 1656 wrote to memory of 1388	1656	WINWORD.EXE	splwow64.exe
PID 1656 wrote to memory of 1388	1656	WINWORD.EXE	splwow64.exe
PID 1656 wrote to memory of 1388	1656	WINWORD.EXE	splwow64.exe
PID 1656 wrote to memory of 1388	1656	WINWORD.EXE	splwow64.exe
PID 960 wrote to memory of 760	960	vbc.exe	vbc.exe
PID 960 wrote to memory of 760	960	vbc.exe	vbc.exe
PID 960 wrote to memory of 760	960	vbc.exe	vbc.exe
PID 960 wrote to memory of 760	960	vbc.exe	vbc.exe
PID 960 wrote to memory of 760	960	vbc.exe	vbc.exe
PID 960 wrote to memory of 760	960	vbc.exe	vbc.exe
PID 960 wrote to memory of 760	960	vbc.exe	vbc.exe
PID 1208 wrote to memory of 1816	1208	Explorer.EXE	wuapp.exe
PID 1208 wrote to memory of 1816	1208	Explorer.EXE	wuapp.exe
PID 1208 wrote to memory of 1816	1208	Explorer.EXE	wuapp.exe
PID 1208 wrote to memory of 1816	1208	Explorer.EXE	wuapp.exe
PID 1208 wrote to memory of 1816	1208	Explorer.EXE	wuapp.exe
PID 1208 wrote to memory of 1816	1208	Explorer.EXE	wuapp.exe
PID 1208 wrote to memory of 1816	1208	Explorer.EXE	wuapp.exe
PID 1816 wrote to memory of 1896	1816	wuapp.exe	cmd.exe
PID 1816 wrote to memory of 1896	1816	wuapp.exe	cmd.exe
PID 1816 wrote to memory of 1896	1816	wuapp.exe	cmd.exe
PID 1816 wrote to memory of 1896	1816	wuapp.exe	cmd.exe

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious use of WriteProcessMemory
PID:1208

C:\Program Files (x86)\Microsoft Office\Office14\WINWORD.EXE
"C:\Program Files (x86)\Microsoft Office\Office14\WINWORD.EXE" /n "C:\Users\Admin\AppData\Local\Temp\INV2021-20800.docx"
2⤵
- Abuses OpenXML format to download file from external location
- Drops file in Windows directory
- Modifies Internet Explorer settings
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1656

C:\Windows\splwow64.exe
C:\Windows\splwow64.exe 12288
3⤵
PID:1388

C:\Windows\SysWOW64\autofmt.exe
"C:\Windows\SysWOW64\autofmt.exe"
2⤵
PID:316

C:\Windows\SysWOW64\autofmt.exe
"C:\Windows\SysWOW64\autofmt.exe"
2⤵
PID:1576

C:\Windows\SysWOW64\autofmt.exe
"C:\Windows\SysWOW64\autofmt.exe"
2⤵
PID:1320

C:\Windows\SysWOW64\autofmt.exe
"C:\Windows\SysWOW64\autofmt.exe"
2⤵
PID:1000

C:\Windows\SysWOW64\autofmt.exe
"C:\Windows\SysWOW64\autofmt.exe"
2⤵
PID:1092

C:\Windows\SysWOW64\autofmt.exe
"C:\Windows\SysWOW64\autofmt.exe"
2⤵
PID:1696

C:\Windows\SysWOW64\autofmt.exe
"C:\Windows\SysWOW64\autofmt.exe"
2⤵
PID:2028

C:\Windows\SysWOW64\autofmt.exe
"C:\Windows\SysWOW64\autofmt.exe"
2⤵
PID:1752

C:\Windows\SysWOW64\wuapp.exe
"C:\Windows\SysWOW64\wuapp.exe"
2⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1816

C:\Windows\SysWOW64\cmd.exe
/c del "C:\Users\Public\vbc.exe"
3⤵
PID:1896

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:512

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:960

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
PID:760

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

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Public\vbc.exe
MD5
9588836132b1ace19a32adee8fc385d2

SHA1
fc31957fd4e9793f3164062ddfa39d62fa18e60e

SHA256
05d6308da69a011a5f95088f5ae7d68aa09e430b05c169dc53d701776b08dd62

SHA512
c098a96d5424d46930c110077780110dba650e26ba2a70c3c2ea390afaf37b5633d2a89acbd27e6cfe128cee5a30f21a44614629f778ba47800dd49bd3f54513

Download Submit
C:\Users\Public\vbc.exe
MD5
9588836132b1ace19a32adee8fc385d2

SHA1
fc31957fd4e9793f3164062ddfa39d62fa18e60e

SHA256
05d6308da69a011a5f95088f5ae7d68aa09e430b05c169dc53d701776b08dd62

SHA512
c098a96d5424d46930c110077780110dba650e26ba2a70c3c2ea390afaf37b5633d2a89acbd27e6cfe128cee5a30f21a44614629f778ba47800dd49bd3f54513

Download Submit
C:\Users\Public\vbc.exe
MD5
9588836132b1ace19a32adee8fc385d2

SHA1
fc31957fd4e9793f3164062ddfa39d62fa18e60e

SHA256
05d6308da69a011a5f95088f5ae7d68aa09e430b05c169dc53d701776b08dd62

SHA512
c098a96d5424d46930c110077780110dba650e26ba2a70c3c2ea390afaf37b5633d2a89acbd27e6cfe128cee5a30f21a44614629f778ba47800dd49bd3f54513

Download Submit
\Users\Public\vbc.exe
MD5
9588836132b1ace19a32adee8fc385d2

SHA1
fc31957fd4e9793f3164062ddfa39d62fa18e60e

SHA256
05d6308da69a011a5f95088f5ae7d68aa09e430b05c169dc53d701776b08dd62

SHA512
c098a96d5424d46930c110077780110dba650e26ba2a70c3c2ea390afaf37b5633d2a89acbd27e6cfe128cee5a30f21a44614629f778ba47800dd49bd3f54513

Download Submit
\Users\Public\vbc.exe
MD5
9588836132b1ace19a32adee8fc385d2

SHA1
fc31957fd4e9793f3164062ddfa39d62fa18e60e

SHA256
05d6308da69a011a5f95088f5ae7d68aa09e430b05c169dc53d701776b08dd62

SHA512
c098a96d5424d46930c110077780110dba650e26ba2a70c3c2ea390afaf37b5633d2a89acbd27e6cfe128cee5a30f21a44614629f778ba47800dd49bd3f54513

Download Submit
\Users\Public\vbc.exe
MD5
9588836132b1ace19a32adee8fc385d2

SHA1
fc31957fd4e9793f3164062ddfa39d62fa18e60e

SHA256
05d6308da69a011a5f95088f5ae7d68aa09e430b05c169dc53d701776b08dd62

SHA512
c098a96d5424d46930c110077780110dba650e26ba2a70c3c2ea390afaf37b5633d2a89acbd27e6cfe128cee5a30f21a44614629f778ba47800dd49bd3f54513

Download Submit
\Users\Public\vbc.exe
MD5
9588836132b1ace19a32adee8fc385d2

SHA1
fc31957fd4e9793f3164062ddfa39d62fa18e60e

SHA256
05d6308da69a011a5f95088f5ae7d68aa09e430b05c169dc53d701776b08dd62

SHA512
c098a96d5424d46930c110077780110dba650e26ba2a70c3c2ea390afaf37b5633d2a89acbd27e6cfe128cee5a30f21a44614629f778ba47800dd49bd3f54513

Download Submit
memory/512-62-0x0000000074F31000-0x0000000074F33000-memory.dmp

Filesize
8KB

Download
memory/760-82-0x0000000000B80000-0x0000000000E83000-memory.dmp

Filesize
3.0MB

Download
memory/760-78-0x0000000000400000-0x000000000042E000-memory.dmp

Filesize
184KB

Download
memory/760-83-0x0000000000180000-0x0000000000194000-memory.dmp

Filesize
80KB

Download
memory/760-79-0x000000000041EB30-mapping.dmp

Download
memory/960-74-0x0000000005090000-0x0000000005091000-memory.dmp

Filesize
4KB

Download
memory/960-67-0x0000000000000000-mapping.dmp

Download
memory/960-75-0x0000000000200000-0x0000000000210000-memory.dmp

Filesize
64KB

Download
memory/960-76-0x00000000057A0000-0x0000000005820000-memory.dmp

Filesize
512KB

Download
memory/960-77-0x0000000000520000-0x0000000000564000-memory.dmp

Filesize
272KB

Download
memory/960-70-0x0000000000AB0000-0x0000000000AB1000-memory.dmp

Filesize
4KB

Download
memory/1208-84-0x0000000004D30000-0x0000000004E15000-memory.dmp

Filesize
916KB

Download
memory/1388-73-0x000007FEFBA81000-0x000007FEFBA83000-memory.dmp

Filesize
8KB

Download
memory/1388-72-0x0000000000000000-mapping.dmp

Download
memory/1656-59-0x0000000072491000-0x0000000072494000-memory.dmp

Filesize
12KB

Download
memory/1656-61-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/1656-60-0x000000006FF11000-0x000000006FF13000-memory.dmp

Filesize
8KB

Download
memory/1816-85-0x0000000000000000-mapping.dmp

Download
memory/1816-88-0x00000000000D0000-0x00000000000FE000-memory.dmp

Filesize
184KB

Download
memory/1816-89-0x0000000000A80000-0x0000000000D83000-memory.dmp

Filesize
3.0MB

Download
memory/1816-87-0x0000000000EF0000-0x0000000000EFB000-memory.dmp

Filesize
44KB

Download
memory/1816-90-0x0000000000910000-0x00000000009A3000-memory.dmp

Filesize
588KB

Download
memory/1896-86-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads