formbook | 7ef5f3085a43a8ab9c302aa9127d13fea92daa426d999181eeba1bc2d8643c44

General

Target

MV. XIN YU.xlsx
Size

1.6MB
MD5

d715d4d4a61b5f887a208c9bddafb9da
SHA1

6cdfe2b35e2418f634a2ab2f0b0edb1cef68faac
SHA256

7ef5f3085a43a8ab9c302aa9127d13fea92daa426d999181eeba1bc2d8643c44
SHA512

af47a4d74577e847cee79e082036bead674054192161eb747c6f6ceaed7de578dde2186ccd0c1a6ad642244e25675b548b3733a3abefcac172cc13cc9f062092

Score

10^/10

formbook rat spyware stealer trojan

Malware Config

Extracted

Family

formbook

C2

http://www.huynhanhdung.com/kna/

Decoy

lawrencefiredepartment.com

executivehomeoffices.com

solfed.world

oshawaexchange.com

webdavlexstore.com

youpieb.com

chiller-master.com

bearstoragetn.com

daf90x16.com

gewhacaalouine.com

simplyezi.com

cstechnologyservices.com

nosyboats.com

thecocomarie.com

vetinaryeco.club

americangoselfilm.com

gdsuhejia.com

verbunden-sein.net

the-minerva.com

loctrantv.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/1644-15-0x0000000000400000-0x000000000042E000-memory.dmp	formbook
behavioral1/memory/1644-16-0x000000000041EAB0-mapping.dmp	formbook
behavioral1/memory/1932-18-0x0000000000000000-mapping.dmp	formbook

Blocklisted process makes network request 1 IoCs

Processes:

EQNEDT32.EXE

flow pid process

6 1724 EQNEDT32.EXE
Executes dropped EXE 2 IoCs

Processes:

vbc.exevbc.exe

pid process

1140 vbc.exe
1644 vbc.exe
Loads dropped DLL 4 IoCs

Processes:

EQNEDT32.EXE

pid process

1724 EQNEDT32.EXE
1724 EQNEDT32.EXE
1724 EQNEDT32.EXE
1724 EQNEDT32.EXE
Uses the VBS compiler for execution 1 TTPs

Scripting
T1064

flow	pid	process
6	1724	EQNEDT32.EXE

pid	process
1140	vbc.exe
1644	vbc.exe

pid	process
1724	EQNEDT32.EXE
1724	EQNEDT32.EXE
1724	EQNEDT32.EXE
1724	EQNEDT32.EXE

Suspicious use of SetThreadContext 3 IoCs

Processes:

vbc.exevbc.exemsiexec.exe

description	pid	process	target process
PID 1140 set thread context of 1644	1140	vbc.exe	vbc.exe
PID 1644 set thread context of 1268	1644	vbc.exe	Explorer.EXE
PID 1932 set thread context of 1268	1932	msiexec.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

1724 EQNEDT32.EXE

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

pid	process
1724	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-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\Toolbar	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote	EXCEL.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote\Contexts = "55"	EXCEL.EXE
Set value (int)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel\Contexts = "1"	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\Toolbar\ShowDiscussionButton = "Yes"	EXCEL.EXE
Key created	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\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-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt\E&xport to Microsoft Excel	EXCEL.EXE
Set value (str)	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\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

1916 EXCEL.EXE

pid	process
1916	EXCEL.EXE

Suspicious behavior: EnumeratesProcesses 22 IoCs

Processes:

vbc.exemsiexec.exe

pid	process
1644	vbc.exe
1644	vbc.exe
1932	msiexec.exe
1932	msiexec.exe
1932	msiexec.exe
1932	msiexec.exe
1932	msiexec.exe
1932	msiexec.exe
1932	msiexec.exe
1932	msiexec.exe
1932	msiexec.exe
1932	msiexec.exe
1932	msiexec.exe
1932	msiexec.exe
1932	msiexec.exe
1932	msiexec.exe
1932	msiexec.exe
1932	msiexec.exe
1932	msiexec.exe
1932	msiexec.exe
1932	msiexec.exe
1932	msiexec.exe

Suspicious behavior: MapViewOfSection 5 IoCs

Processes:

vbc.exemsiexec.exe

pid process

1644 vbc.exe
1644 vbc.exe
1644 vbc.exe
1932 msiexec.exe
1932 msiexec.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

vbc.exemsiexec.exe

description pid process

Token: SeDebugPrivilege 1644 vbc.exe
Token: SeDebugPrivilege 1932 msiexec.exe
Suspicious use of FindShellTrayWindow 4 IoCs

Processes:

Explorer.EXE

pid process

1268 Explorer.EXE
1268 Explorer.EXE
1268 Explorer.EXE
1268 Explorer.EXE
Suspicious use of SendNotifyMessage 4 IoCs

Processes:

Explorer.EXE

pid process

1268 Explorer.EXE
1268 Explorer.EXE
1268 Explorer.EXE
1268 Explorer.EXE
Suspicious use of SetWindowsHookEx 3 IoCs

Processes:

EXCEL.EXE

pid process

1916 EXCEL.EXE
1916 EXCEL.EXE
1916 EXCEL.EXE

description	pid	process
Token: SeDebugPrivilege	1644	vbc.exe
Token: SeDebugPrivilege	1932	msiexec.exe

pid	process
1268	Explorer.EXE
1268	Explorer.EXE
1268	Explorer.EXE
1268	Explorer.EXE

pid	process
1268	Explorer.EXE
1268	Explorer.EXE
1268	Explorer.EXE
1268	Explorer.EXE

pid	process
1916	EXCEL.EXE
1916	EXCEL.EXE
1916	EXCEL.EXE

Suspicious use of WriteProcessMemory 22 IoCs

Processes:

EQNEDT32.EXEvbc.exeExplorer.EXEmsiexec.exe

description	pid	process	target process
PID 1724 wrote to memory of 1140	1724	EQNEDT32.EXE	vbc.exe
PID 1724 wrote to memory of 1140	1724	EQNEDT32.EXE	vbc.exe
PID 1724 wrote to memory of 1140	1724	EQNEDT32.EXE	vbc.exe
PID 1724 wrote to memory of 1140	1724	EQNEDT32.EXE	vbc.exe
PID 1140 wrote to memory of 1644	1140	vbc.exe	vbc.exe
PID 1140 wrote to memory of 1644	1140	vbc.exe	vbc.exe
PID 1140 wrote to memory of 1644	1140	vbc.exe	vbc.exe
PID 1140 wrote to memory of 1644	1140	vbc.exe	vbc.exe
PID 1140 wrote to memory of 1644	1140	vbc.exe	vbc.exe
PID 1140 wrote to memory of 1644	1140	vbc.exe	vbc.exe
PID 1140 wrote to memory of 1644	1140	vbc.exe	vbc.exe
PID 1268 wrote to memory of 1932	1268	Explorer.EXE	msiexec.exe
PID 1268 wrote to memory of 1932	1268	Explorer.EXE	msiexec.exe
PID 1268 wrote to memory of 1932	1268	Explorer.EXE	msiexec.exe
PID 1268 wrote to memory of 1932	1268	Explorer.EXE	msiexec.exe
PID 1268 wrote to memory of 1932	1268	Explorer.EXE	msiexec.exe
PID 1268 wrote to memory of 1932	1268	Explorer.EXE	msiexec.exe
PID 1268 wrote to memory of 1932	1268	Explorer.EXE	msiexec.exe
PID 1932 wrote to memory of 284	1932	msiexec.exe	cmd.exe
PID 1932 wrote to memory of 284	1932	msiexec.exe	cmd.exe
PID 1932 wrote to memory of 284	1932	msiexec.exe	cmd.exe
PID 1932 wrote to memory of 284	1932	msiexec.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:1268

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\MV. XIN YU.xlsx"
2⤵
- Enumerates system info in registry
- Modifies Internet Explorer settings
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
PID:1916

C:\Windows\SysWOW64\msiexec.exe
"C:\Windows\SysWOW64\msiexec.exe"
2⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1932

C:\Windows\SysWOW64\cmd.exe
/c del "C:\Users\Public\vbc.exe"
3⤵
PID:284

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:1724

C:\Users\Public\vbc.exe
"C:\Users\Public\vbc.exe"
2⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1140

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:1644

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
0d6dc87e3f4948bdedf40980ac0f8f30

SHA1
76424fed3a6131f3e49975978343b8836cc11006

SHA256
f777596fe0fa9c11e6ff244810d6c6d4846f9c03b8840ad88ac8853de8a766db

SHA512
e63d837d9345b2d936b223ad2090032af8debb2323b0d2b5c9341041c740a840ccbecc4df79e60cf972fbe5087fcedcfae3bcb1dbcc71c24128fb454d1fc39ab

Download Submit
C:\Users\Public\vbc.exe
MD5
0d6dc87e3f4948bdedf40980ac0f8f30

SHA1
76424fed3a6131f3e49975978343b8836cc11006

SHA256
f777596fe0fa9c11e6ff244810d6c6d4846f9c03b8840ad88ac8853de8a766db

SHA512
e63d837d9345b2d936b223ad2090032af8debb2323b0d2b5c9341041c740a840ccbecc4df79e60cf972fbe5087fcedcfae3bcb1dbcc71c24128fb454d1fc39ab

Download Submit
C:\Users\Public\vbc.exe
MD5
0d6dc87e3f4948bdedf40980ac0f8f30

SHA1
76424fed3a6131f3e49975978343b8836cc11006

SHA256
f777596fe0fa9c11e6ff244810d6c6d4846f9c03b8840ad88ac8853de8a766db

SHA512
e63d837d9345b2d936b223ad2090032af8debb2323b0d2b5c9341041c740a840ccbecc4df79e60cf972fbe5087fcedcfae3bcb1dbcc71c24128fb454d1fc39ab

Download Submit
\Users\Public\vbc.exe
MD5
0d6dc87e3f4948bdedf40980ac0f8f30

SHA1
76424fed3a6131f3e49975978343b8836cc11006

SHA256
f777596fe0fa9c11e6ff244810d6c6d4846f9c03b8840ad88ac8853de8a766db

SHA512
e63d837d9345b2d936b223ad2090032af8debb2323b0d2b5c9341041c740a840ccbecc4df79e60cf972fbe5087fcedcfae3bcb1dbcc71c24128fb454d1fc39ab

Download Submit
\Users\Public\vbc.exe
MD5
0d6dc87e3f4948bdedf40980ac0f8f30

SHA1
76424fed3a6131f3e49975978343b8836cc11006

SHA256
f777596fe0fa9c11e6ff244810d6c6d4846f9c03b8840ad88ac8853de8a766db

SHA512
e63d837d9345b2d936b223ad2090032af8debb2323b0d2b5c9341041c740a840ccbecc4df79e60cf972fbe5087fcedcfae3bcb1dbcc71c24128fb454d1fc39ab

Download Submit
\Users\Public\vbc.exe
MD5
0d6dc87e3f4948bdedf40980ac0f8f30

SHA1
76424fed3a6131f3e49975978343b8836cc11006

SHA256
f777596fe0fa9c11e6ff244810d6c6d4846f9c03b8840ad88ac8853de8a766db

SHA512
e63d837d9345b2d936b223ad2090032af8debb2323b0d2b5c9341041c740a840ccbecc4df79e60cf972fbe5087fcedcfae3bcb1dbcc71c24128fb454d1fc39ab

Download Submit
\Users\Public\vbc.exe
MD5
0d6dc87e3f4948bdedf40980ac0f8f30

SHA1
76424fed3a6131f3e49975978343b8836cc11006

SHA256
f777596fe0fa9c11e6ff244810d6c6d4846f9c03b8840ad88ac8853de8a766db

SHA512
e63d837d9345b2d936b223ad2090032af8debb2323b0d2b5c9341041c740a840ccbecc4df79e60cf972fbe5087fcedcfae3bcb1dbcc71c24128fb454d1fc39ab

Download Submit
memory/284-20-0x0000000000000000-mapping.dmp

Download
memory/748-2-0x000007FEF6270000-0x000007FEF64EA000-memory.dmp

Filesize
2.5MB

Download
memory/1140-10-0x000000006C550000-0x000000006CC3E000-memory.dmp

Filesize
6.9MB

Download
memory/1140-13-0x0000000000510000-0x000000000051E000-memory.dmp

Filesize
56KB

Download
memory/1140-14-0x0000000004DE0000-0x0000000004E65000-memory.dmp

Filesize
532KB

Download
memory/1140-11-0x0000000000C70000-0x0000000000C71000-memory.dmp

Filesize
4KB

Download
memory/1140-7-0x0000000000000000-mapping.dmp

Download
memory/1644-15-0x0000000000400000-0x000000000042E000-memory.dmp

Filesize
184KB

Download
memory/1644-16-0x000000000041EAB0-mapping.dmp

Download
memory/1932-18-0x0000000000000000-mapping.dmp

Download
memory/1932-19-0x0000000000DC0000-0x0000000000DD4000-memory.dmp

Filesize
80KB

Download
memory/1932-21-0x0000000000BA0000-0x0000000000C37000-memory.dmp

Filesize
604KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads