formbook | 8c4ecf908b97c808d8cc843ecd6c32928d3402b348b897b46629c2a96351ac39

General

Target

invoice.xlsx
Size

1.4MB
MD5

f797660bb4a8d43cf75e570e59ffd6a1
SHA1

830d68b065521d15f014677aa80acc4fc4098360
SHA256

8c4ecf908b97c808d8cc843ecd6c32928d3402b348b897b46629c2a96351ac39
SHA512

c7fdd95ec3e672ecd312d63f75876c6142676a054c594d0dcddb0c1b56c677f9f10338133ef8e38a38ea64bca2c51aa812080e2be0c70070fdb6efb0f3d794b9

Score

10^/10

formbook xloader loader rat spyware stealer trojan

Malware Config

Extracted

Family

formbook

C2

http://www.h-v-biz.com/c8so/

Decoy

floeperformancegear.com

youtubeincreaser.com

cbb-is.com

bullsbikeusa.com

mama-asobitai.com

parkdaleliving.com

kinneintl.com

byrondramos.com

topangashaman.com

channel1057.com

nuancedigitalsolutions.com

kumheekim.com

erikating.com

ulinekorea.com

giftoes.com

blacknation.info

eventsdonevirtually.com

mx190501.com

bingent.info

seronofertilitymeds.com

Signatures

Formbook
Formbook is a data stealing malware which is capable of stealing data.
trojan spyware stealer formbook
Xloader
Xloader is a rebranded version of Formbook malware.
loader xloader

Xloader Payload 3 IoCs

rat

Processes:

resource	yara_rule
behavioral1/memory/1372-18-0x000000000041CFE0-mapping.dmp	xloader
behavioral1/memory/1372-17-0x0000000000400000-0x0000000000428000-memory.dmp	xloader
behavioral1/memory/1324-21-0x0000000000000000-mapping.dmp	xloader

Blocklisted process makes network request 1 IoCs

Processes:

EQNEDT32.EXE

flow pid process

7 1156 EQNEDT32.EXE
Executes dropped EXE 2 IoCs

Processes:

vbc.exevbc.exe

pid process

928 vbc.exe
1372 vbc.exe
Loads dropped DLL 4 IoCs

Processes:

EQNEDT32.EXE

pid process

1156 EQNEDT32.EXE
1156 EQNEDT32.EXE
1156 EQNEDT32.EXE
1156 EQNEDT32.EXE
Uses the VBS compiler for execution 1 TTPs

Scripting
T1064

flow	pid	process
7	1156	EQNEDT32.EXE

pid	process
928	vbc.exe
1372	vbc.exe

pid	process
1156	EQNEDT32.EXE
1156	EQNEDT32.EXE
1156	EQNEDT32.EXE
1156	EQNEDT32.EXE

Suspicious use of SetThreadContext 4 IoCs

Processes:

vbc.exevbc.exechkdsk.exe

description	pid	process	target process
PID 928 set thread context of 1372	928	vbc.exe	vbc.exe
PID 1372 set thread context of 1196	1372	vbc.exe	Explorer.EXE
PID 1372 set thread context of 1196	1372	vbc.exe	Explorer.EXE
PID 1324 set thread context of 1196	1324	chkdsk.exe	Explorer.EXE

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

1600 schtasks.exe

pid	process
1600	schtasks.exe

Enumerates system info in registry 2 TTPs 2 IoCs

Query Registry

T1012

System Information Discovery

T1082

Processes:

EXCEL.EXEchkdsk.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\FloatingPointProcessor	EXCEL.EXE
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\Identifier	chkdsk.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

1156 EQNEDT32.EXE

pid	process
1156	EQNEDT32.EXE

Modifies Internet Explorer settings 1 TTPs 9 IoCs

adware spyware

Modify Registry

T1112

Processes:

EXCEL.EXE

description	ioc	process
Set value (int)	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\Contexts = "55"	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\EXCEL.EXE/3000"	EXCEL.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\Contexts = "1"	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\Toolbar	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\Toolbar\ShowDiscussionButton = "Yes"	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\MenuExt	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\ = "res://C:\\PROGRA~2\\MICROS~1\\Office14\\ONBttnIE.dll/105"	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-293278959-2699126792-324916226-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

EXCEL.EXE

pid process

1036 EXCEL.EXE

pid	process
1036	EXCEL.EXE

Suspicious behavior: EnumeratesProcesses 19 IoCs

Processes:

vbc.exechkdsk.exe

pid	process
1372	vbc.exe
1372	vbc.exe
1372	vbc.exe
1324	chkdsk.exe
1324	chkdsk.exe
1324	chkdsk.exe
1324	chkdsk.exe
1324	chkdsk.exe
1324	chkdsk.exe
1324	chkdsk.exe
1324	chkdsk.exe
1324	chkdsk.exe
1324	chkdsk.exe
1324	chkdsk.exe
1324	chkdsk.exe
1324	chkdsk.exe
1324	chkdsk.exe
1324	chkdsk.exe
1324	chkdsk.exe

Suspicious behavior: MapViewOfSection 6 IoCs

Processes:

vbc.exechkdsk.exe

pid process

1372 vbc.exe
1372 vbc.exe
1372 vbc.exe
1372 vbc.exe
1324 chkdsk.exe
1324 chkdsk.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

vbc.exevbc.exechkdsk.exe

description pid process

Token: SeDebugPrivilege 928 vbc.exe
Token: SeDebugPrivilege 1372 vbc.exe
Token: SeDebugPrivilege 1324 chkdsk.exe
Suspicious use of FindShellTrayWindow 4 IoCs

Processes:

Explorer.EXE

pid process

1196 Explorer.EXE
1196 Explorer.EXE
1196 Explorer.EXE
1196 Explorer.EXE
Suspicious use of SendNotifyMessage 4 IoCs

Processes:

Explorer.EXE

pid process

1196 Explorer.EXE
1196 Explorer.EXE
1196 Explorer.EXE
1196 Explorer.EXE
Suspicious use of SetWindowsHookEx 3 IoCs

Processes:

EXCEL.EXE

pid process

1036 EXCEL.EXE
1036 EXCEL.EXE
1036 EXCEL.EXE

description	pid	process
Token: SeDebugPrivilege	928	vbc.exe
Token: SeDebugPrivilege	1372	vbc.exe
Token: SeDebugPrivilege	1324	chkdsk.exe

pid	process
1196	Explorer.EXE
1196	Explorer.EXE
1196	Explorer.EXE
1196	Explorer.EXE

pid	process
1196	Explorer.EXE
1196	Explorer.EXE
1196	Explorer.EXE
1196	Explorer.EXE

pid	process
1036	EXCEL.EXE
1036	EXCEL.EXE
1036	EXCEL.EXE

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

EQNEDT32.EXEvbc.exeExplorer.EXEchkdsk.exe

description	pid	process	target process
PID 1156 wrote to memory of 928	1156	EQNEDT32.EXE	vbc.exe
PID 1156 wrote to memory of 928	1156	EQNEDT32.EXE	vbc.exe
PID 1156 wrote to memory of 928	1156	EQNEDT32.EXE	vbc.exe
PID 1156 wrote to memory of 928	1156	EQNEDT32.EXE	vbc.exe
PID 928 wrote to memory of 1600	928	vbc.exe	schtasks.exe
PID 928 wrote to memory of 1600	928	vbc.exe	schtasks.exe
PID 928 wrote to memory of 1600	928	vbc.exe	schtasks.exe
PID 928 wrote to memory of 1600	928	vbc.exe	schtasks.exe
PID 928 wrote to memory of 1372	928	vbc.exe	vbc.exe
PID 928 wrote to memory of 1372	928	vbc.exe	vbc.exe
PID 928 wrote to memory of 1372	928	vbc.exe	vbc.exe
PID 928 wrote to memory of 1372	928	vbc.exe	vbc.exe
PID 928 wrote to memory of 1372	928	vbc.exe	vbc.exe
PID 928 wrote to memory of 1372	928	vbc.exe	vbc.exe
PID 928 wrote to memory of 1372	928	vbc.exe	vbc.exe
PID 1196 wrote to memory of 1324	1196	Explorer.EXE	chkdsk.exe
PID 1196 wrote to memory of 1324	1196	Explorer.EXE	chkdsk.exe
PID 1196 wrote to memory of 1324	1196	Explorer.EXE	chkdsk.exe
PID 1196 wrote to memory of 1324	1196	Explorer.EXE	chkdsk.exe
PID 1324 wrote to memory of 1720	1324	chkdsk.exe	cmd.exe
PID 1324 wrote to memory of 1720	1324	chkdsk.exe	cmd.exe
PID 1324 wrote to memory of 1720	1324	chkdsk.exe	cmd.exe
PID 1324 wrote to memory of 1720	1324	chkdsk.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: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\invoice.xlsx
2⤵
- Enumerates system info in registry
- Modifies Internet Explorer settings
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
PID:1036

C:\Windows\SysWOW64\chkdsk.exe
"C:\Windows\SysWOW64\chkdsk.exe"
2⤵
- Suspicious use of SetThreadContext
- Enumerates system info in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1324

C:\Windows\SysWOW64\cmd.exe
/c del "C:\Users\Public\vbc.exe"
3⤵
PID:1720

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:1156

C:\Users\Public\vbc.exe
"C:\Users\Public\vbc.exe"
2⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:928

C:\Windows\SysWOW64\schtasks.exe
"C:\Windows\System32\schtasks.exe" /Create /TN "Updates\dromkeG" /XML "C:\Users\Admin\AppData\Local\Temp\tmp315D.tmp"
3⤵
- Creates scheduled task(s)
PID:1600

C:\Users\Public\vbc.exe
"{path}"
3⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
PID:1372

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scripting

1

T1064

Scheduled Task

1

T1053

Exploitation for Client Execution

1

T1203

Persistence

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

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\Admin\AppData\Local\Temp\tmp315D.tmp
MD5
56b3e72ecc4d443da73ca752593fa22b

SHA1
d55f157e39628e52536540d1e3b6b3024190c76d

SHA256
d54974e6f93cd71f5ce1292e96a00faa287088def85846dc44e8243c78788a74

SHA512
f7b8b9102a8a973124da76aac085fb35514cb3eecee8f7442d99baefebc0fb4018cbe07dab711152d954e916e7e485c5ae3cb323c01335b1e66c70aa50bc04ae

Download Submit
C:\Users\Public\vbc.exe
MD5
8fb76e6c9b652646d7c1f7f377c97cbd

SHA1
087721c9ad24c3895e66186c208512706b64f025

SHA256
81e7927ab5ca518d06687dc18d5c4df22198011494322486e562136344d2513b

SHA512
cfb1aa684ea4be725ec7c63cb6477404f7a591b017743866e77afea9f39fd1c117af614b3654d21652f43ffcad31ad63bd93981ef17dc37157e3b4be1f6bdb8b

Download Submit
C:\Users\Public\vbc.exe
MD5
8fb76e6c9b652646d7c1f7f377c97cbd

SHA1
087721c9ad24c3895e66186c208512706b64f025

SHA256
81e7927ab5ca518d06687dc18d5c4df22198011494322486e562136344d2513b

SHA512
cfb1aa684ea4be725ec7c63cb6477404f7a591b017743866e77afea9f39fd1c117af614b3654d21652f43ffcad31ad63bd93981ef17dc37157e3b4be1f6bdb8b

Download Submit
C:\Users\Public\vbc.exe
MD5
8fb76e6c9b652646d7c1f7f377c97cbd

SHA1
087721c9ad24c3895e66186c208512706b64f025

SHA256
81e7927ab5ca518d06687dc18d5c4df22198011494322486e562136344d2513b

SHA512
cfb1aa684ea4be725ec7c63cb6477404f7a591b017743866e77afea9f39fd1c117af614b3654d21652f43ffcad31ad63bd93981ef17dc37157e3b4be1f6bdb8b

Download Submit
\Users\Public\vbc.exe
MD5
8fb76e6c9b652646d7c1f7f377c97cbd

SHA1
087721c9ad24c3895e66186c208512706b64f025

SHA256
81e7927ab5ca518d06687dc18d5c4df22198011494322486e562136344d2513b

SHA512
cfb1aa684ea4be725ec7c63cb6477404f7a591b017743866e77afea9f39fd1c117af614b3654d21652f43ffcad31ad63bd93981ef17dc37157e3b4be1f6bdb8b

Download Submit
\Users\Public\vbc.exe
MD5
8fb76e6c9b652646d7c1f7f377c97cbd

SHA1
087721c9ad24c3895e66186c208512706b64f025

SHA256
81e7927ab5ca518d06687dc18d5c4df22198011494322486e562136344d2513b

SHA512
cfb1aa684ea4be725ec7c63cb6477404f7a591b017743866e77afea9f39fd1c117af614b3654d21652f43ffcad31ad63bd93981ef17dc37157e3b4be1f6bdb8b

Download Submit
\Users\Public\vbc.exe
MD5
8fb76e6c9b652646d7c1f7f377c97cbd

SHA1
087721c9ad24c3895e66186c208512706b64f025

SHA256
81e7927ab5ca518d06687dc18d5c4df22198011494322486e562136344d2513b

SHA512
cfb1aa684ea4be725ec7c63cb6477404f7a591b017743866e77afea9f39fd1c117af614b3654d21652f43ffcad31ad63bd93981ef17dc37157e3b4be1f6bdb8b

Download Submit
\Users\Public\vbc.exe
MD5
8fb76e6c9b652646d7c1f7f377c97cbd

SHA1
087721c9ad24c3895e66186c208512706b64f025

SHA256
81e7927ab5ca518d06687dc18d5c4df22198011494322486e562136344d2513b

SHA512
cfb1aa684ea4be725ec7c63cb6477404f7a591b017743866e77afea9f39fd1c117af614b3654d21652f43ffcad31ad63bd93981ef17dc37157e3b4be1f6bdb8b

Download Submit
memory/928-13-0x0000000000950000-0x000000000095E000-memory.dmp

Filesize
56KB

Download
memory/928-14-0x00000000002E0000-0x000000000035B000-memory.dmp

Filesize
492KB

Download
memory/928-10-0x000000006C8A0000-0x000000006CF8E000-memory.dmp

Filesize
6.9MB

Download
memory/928-7-0x0000000000000000-mapping.dmp

Download
memory/928-11-0x0000000001090000-0x0000000001091000-memory.dmp

Filesize
4KB

Download
memory/1196-20-0x0000000006390000-0x00000000064D7000-memory.dmp

Filesize
1.3MB

Download
memory/1324-24-0x0000000004880000-0x0000000004923000-memory.dmp

Filesize
652KB

Download
memory/1324-22-0x0000000000210000-0x0000000000217000-memory.dmp

Filesize
28KB

Download
memory/1324-21-0x0000000000000000-mapping.dmp

Download
memory/1372-18-0x000000000041CFE0-mapping.dmp

Download
memory/1372-17-0x0000000000400000-0x0000000000428000-memory.dmp

Filesize
160KB

Download
memory/1432-2-0x000007FEF6550000-0x000007FEF67CA000-memory.dmp

Filesize
2.5MB

Download
memory/1600-15-0x0000000000000000-mapping.dmp

Download
memory/1720-23-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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