formbook | 5fd2f87cfb199fdc7d2f870e6e0cd276a132d1f034f48fbc54d97149117b13f2

General

Target

PO81105083.xlsx
Size

2.2MB
MD5

9797bc6c5ce33a7cc291dd48899c0f92
SHA1

2c19029d4a5207aeb0dd73bb8b00adc4d17c9b40
SHA256

5fd2f87cfb199fdc7d2f870e6e0cd276a132d1f034f48fbc54d97149117b13f2
SHA512

4681140bba76c793fbe2d0d2a85fafc766d4579c1f26aca8bb4cb5566335b39677669fda9a87c26ebd4399b143580e5a96667d0d8e8dba03f98be22887632be6

Score

10^/10

formbook xloader loader ransomware rat spyware stealer trojan

Malware Config

Extracted

Family

formbook

C2

http://www.chuanxingtong.com/j5an/

Decoy

xwwgj.com

release-paypal.com

investorshighway.com

maglex.info

chenangopistolpermit.com

thebihareye.com

sanjosemasks.com

foremanmotors.com

stadtstreicherin.com

9247pf.com

erenvincplatform.xyz

cushcaps.com

flatisteam.com

kojyouibennto.com

rahmatsuparman.com

vallyfades.online

metropitstop.com

shopasha.com

windycitycreditsolutions.com

uproxysite.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 2 IoCs

rat

Processes:

resource	yara_rule
behavioral1/memory/1916-16-0x0000000000400000-0x0000000000429000-memory.dmp	xloader
behavioral1/memory/1624-25-0x0000000000080000-0x00000000000A9000-memory.dmp	xloader

Blocklisted process makes network request 3 IoCs

Processes:

EQNEDT32.EXE

flow pid process

7 1792 EQNEDT32.EXE
8 1792 EQNEDT32.EXE
10 1792 EQNEDT32.EXE
Executes dropped EXE 2 IoCs

Processes:

vbc.exevbc.exe

pid process

1544 vbc.exe
1916 vbc.exe
Loads dropped DLL 4 IoCs

Processes:

EQNEDT32.EXE

pid process

1792 EQNEDT32.EXE
1792 EQNEDT32.EXE
1792 EQNEDT32.EXE
1792 EQNEDT32.EXE
Uses the VBS compiler for execution 1 TTPs

Scripting
T1064
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.
ransomware

System Information Discovery
T1082

flow	pid	process
7	1792	EQNEDT32.EXE
8	1792	EQNEDT32.EXE
10	1792	EQNEDT32.EXE

pid	process
1544	vbc.exe
1916	vbc.exe

pid	process
1792	EQNEDT32.EXE
1792	EQNEDT32.EXE
1792	EQNEDT32.EXE
1792	EQNEDT32.EXE

Suspicious use of SetThreadContext 4 IoCs

Processes:

vbc.exevbc.exesvchost.exe

description	pid	process	target process
PID 1544 set thread context of 1916	1544	vbc.exe	vbc.exe
PID 1916 set thread context of 1276	1916	vbc.exe	Explorer.EXE
PID 1916 set thread context of 1276	1916	vbc.exe	Explorer.EXE
PID 1624 set thread context of 1276	1624	svchost.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

1792 EQNEDT32.EXE

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

pid	process
1792	EQNEDT32.EXE

Modifies Internet Explorer settings 1 TTPs 9 IoCs

adware spyware

Modify Registry

T1112

Processes:

EXCEL.EXE

description	ioc	process
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\Toolbar	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
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
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
Key created	\REGISTRY\USER\S-1-5-21-3825035466-2522850611-591511364-1000\Software\Microsoft\Internet Explorer\MenuExt\Se&nd to OneNote	EXCEL.EXE

Suspicious behavior: AddClipboardFormatListener 1 IoCs

Processes:

EXCEL.EXE

pid process

1924 EXCEL.EXE

pid	process
1924	EXCEL.EXE

Suspicious behavior: EnumeratesProcesses 29 IoCs

Processes:

vbc.exesvchost.exe

pid	process
1916	vbc.exe
1916	vbc.exe
1916	vbc.exe
1624	svchost.exe
1624	svchost.exe
1624	svchost.exe
1624	svchost.exe
1624	svchost.exe
1624	svchost.exe
1624	svchost.exe
1624	svchost.exe
1624	svchost.exe
1624	svchost.exe
1624	svchost.exe
1624	svchost.exe
1624	svchost.exe
1624	svchost.exe
1624	svchost.exe
1624	svchost.exe
1624	svchost.exe
1624	svchost.exe
1624	svchost.exe
1624	svchost.exe
1624	svchost.exe
1624	svchost.exe
1624	svchost.exe
1624	svchost.exe
1624	svchost.exe
1624	svchost.exe

Suspicious behavior: MapViewOfSection 7 IoCs

Processes:

vbc.exevbc.exesvchost.exe

pid process

1544 vbc.exe
1916 vbc.exe
1916 vbc.exe
1916 vbc.exe
1916 vbc.exe
1624 svchost.exe
1624 svchost.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

vbc.exesvchost.exe

description pid process

Token: SeDebugPrivilege 1916 vbc.exe
Token: SeDebugPrivilege 1624 svchost.exe
Suspicious use of FindShellTrayWindow 4 IoCs

Processes:

Explorer.EXE

pid process

1276 Explorer.EXE
1276 Explorer.EXE
1276 Explorer.EXE
1276 Explorer.EXE
Suspicious use of SendNotifyMessage 4 IoCs

Processes:

Explorer.EXE

pid process

1276 Explorer.EXE
1276 Explorer.EXE
1276 Explorer.EXE
1276 Explorer.EXE
Suspicious use of SetWindowsHookEx 3 IoCs

Processes:

EXCEL.EXE

pid process

1924 EXCEL.EXE
1924 EXCEL.EXE
1924 EXCEL.EXE

pid	process
1544	vbc.exe
1916	vbc.exe
1916	vbc.exe
1916	vbc.exe
1916	vbc.exe
1624	svchost.exe
1624	svchost.exe

description	pid	process
Token: SeDebugPrivilege	1916	vbc.exe
Token: SeDebugPrivilege	1624	svchost.exe

pid	process
1276	Explorer.EXE
1276	Explorer.EXE
1276	Explorer.EXE
1276	Explorer.EXE

pid	process
1276	Explorer.EXE
1276	Explorer.EXE
1276	Explorer.EXE
1276	Explorer.EXE

pid	process
1924	EXCEL.EXE
1924	EXCEL.EXE
1924	EXCEL.EXE

Suspicious use of WriteProcessMemory 17 IoCs

Processes:

EQNEDT32.EXEvbc.exeExplorer.EXEsvchost.exe

description	pid	process	target process
PID 1792 wrote to memory of 1544	1792	EQNEDT32.EXE	vbc.exe
PID 1792 wrote to memory of 1544	1792	EQNEDT32.EXE	vbc.exe
PID 1792 wrote to memory of 1544	1792	EQNEDT32.EXE	vbc.exe
PID 1792 wrote to memory of 1544	1792	EQNEDT32.EXE	vbc.exe
PID 1544 wrote to memory of 1916	1544	vbc.exe	vbc.exe
PID 1544 wrote to memory of 1916	1544	vbc.exe	vbc.exe
PID 1544 wrote to memory of 1916	1544	vbc.exe	vbc.exe
PID 1544 wrote to memory of 1916	1544	vbc.exe	vbc.exe
PID 1544 wrote to memory of 1916	1544	vbc.exe	vbc.exe
PID 1276 wrote to memory of 1624	1276	Explorer.EXE	svchost.exe
PID 1276 wrote to memory of 1624	1276	Explorer.EXE	svchost.exe
PID 1276 wrote to memory of 1624	1276	Explorer.EXE	svchost.exe
PID 1276 wrote to memory of 1624	1276	Explorer.EXE	svchost.exe
PID 1624 wrote to memory of 1776	1624	svchost.exe	cmd.exe
PID 1624 wrote to memory of 1776	1624	svchost.exe	cmd.exe
PID 1624 wrote to memory of 1776	1624	svchost.exe	cmd.exe
PID 1624 wrote to memory of 1776	1624	svchost.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:1276

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\PO81105083.xlsx
2⤵
- Enumerates system info in registry
- Modifies Internet Explorer settings
- Suspicious behavior: AddClipboardFormatListener
- Suspicious use of SetWindowsHookEx
PID:1924

C:\Windows\SysWOW64\autofmt.exe
"C:\Windows\SysWOW64\autofmt.exe"
2⤵
PID:1072

C:\Windows\SysWOW64\svchost.exe
"C:\Windows\SysWOW64\svchost.exe"
2⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1624

C:\Windows\SysWOW64\cmd.exe
/c del "C:\Users\Public\vbc.exe"
3⤵
PID:1776

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:1792

C:\Users\Public\vbc.exe
"C:\Users\Public\vbc.exe"
2⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:1544

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:1916

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

System Information Discovery

2

T1082

Query Registry

1

T1012

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Public\vbc.exe
MD5
2d435a73a52785b8912a447e4e205e50

SHA1
082edf778cbf0a7af0994d2a0b7d397b6a820f33

SHA256
1d87d74fe3b493880a672905108416227b6a2996eae2da3d8226cf65ae8ade26

SHA512
288063c4fe25cba62a24a9cb074c0362fd137a54f378e18eb537569750f3c7c26bd1a6343ca95ab805e02cc6b789e3d5b8ecc6e3f877eecfb4fda8c5a89aa7be

Download Submit
C:\Users\Public\vbc.exe
MD5
2d435a73a52785b8912a447e4e205e50

SHA1
082edf778cbf0a7af0994d2a0b7d397b6a820f33

SHA256
1d87d74fe3b493880a672905108416227b6a2996eae2da3d8226cf65ae8ade26

SHA512
288063c4fe25cba62a24a9cb074c0362fd137a54f378e18eb537569750f3c7c26bd1a6343ca95ab805e02cc6b789e3d5b8ecc6e3f877eecfb4fda8c5a89aa7be

Download Submit
C:\Users\Public\vbc.exe
MD5
2d435a73a52785b8912a447e4e205e50

SHA1
082edf778cbf0a7af0994d2a0b7d397b6a820f33

SHA256
1d87d74fe3b493880a672905108416227b6a2996eae2da3d8226cf65ae8ade26

SHA512
288063c4fe25cba62a24a9cb074c0362fd137a54f378e18eb537569750f3c7c26bd1a6343ca95ab805e02cc6b789e3d5b8ecc6e3f877eecfb4fda8c5a89aa7be

Download Submit
\Users\Public\vbc.exe
MD5
2d435a73a52785b8912a447e4e205e50

SHA1
082edf778cbf0a7af0994d2a0b7d397b6a820f33

SHA256
1d87d74fe3b493880a672905108416227b6a2996eae2da3d8226cf65ae8ade26

SHA512
288063c4fe25cba62a24a9cb074c0362fd137a54f378e18eb537569750f3c7c26bd1a6343ca95ab805e02cc6b789e3d5b8ecc6e3f877eecfb4fda8c5a89aa7be

Download Submit
\Users\Public\vbc.exe
MD5
2d435a73a52785b8912a447e4e205e50

SHA1
082edf778cbf0a7af0994d2a0b7d397b6a820f33

SHA256
1d87d74fe3b493880a672905108416227b6a2996eae2da3d8226cf65ae8ade26

SHA512
288063c4fe25cba62a24a9cb074c0362fd137a54f378e18eb537569750f3c7c26bd1a6343ca95ab805e02cc6b789e3d5b8ecc6e3f877eecfb4fda8c5a89aa7be

Download Submit
\Users\Public\vbc.exe
MD5
2d435a73a52785b8912a447e4e205e50

SHA1
082edf778cbf0a7af0994d2a0b7d397b6a820f33

SHA256
1d87d74fe3b493880a672905108416227b6a2996eae2da3d8226cf65ae8ade26

SHA512
288063c4fe25cba62a24a9cb074c0362fd137a54f378e18eb537569750f3c7c26bd1a6343ca95ab805e02cc6b789e3d5b8ecc6e3f877eecfb4fda8c5a89aa7be

Download Submit
\Users\Public\vbc.exe
MD5
2d435a73a52785b8912a447e4e205e50

SHA1
082edf778cbf0a7af0994d2a0b7d397b6a820f33

SHA256
1d87d74fe3b493880a672905108416227b6a2996eae2da3d8226cf65ae8ade26

SHA512
288063c4fe25cba62a24a9cb074c0362fd137a54f378e18eb537569750f3c7c26bd1a6343ca95ab805e02cc6b789e3d5b8ecc6e3f877eecfb4fda8c5a89aa7be

Download Submit
memory/1276-28-0x00000000063F0000-0x00000000064BE000-memory.dmp

Filesize
824KB

Download
memory/1276-18-0x0000000003E60000-0x0000000003F6E000-memory.dmp

Filesize
1.1MB

Download
memory/1276-21-0x0000000006B00000-0x0000000006C57000-memory.dmp

Filesize
1.3MB

Download
memory/1544-11-0x0000000000000000-mapping.dmp

Download
memory/1624-25-0x0000000000080000-0x00000000000A9000-memory.dmp

Filesize
164KB

Download
memory/1624-26-0x0000000000740000-0x0000000000A43000-memory.dmp

Filesize
3.0MB

Download
memory/1624-27-0x0000000000500000-0x0000000000590000-memory.dmp

Filesize
576KB

Download
memory/1624-24-0x0000000000E70000-0x0000000000E78000-memory.dmp

Filesize
32KB

Download
memory/1624-22-0x0000000000000000-mapping.dmp

Download
memory/1732-6-0x000007FEF79D0000-0x000007FEF7C4A000-memory.dmp

Filesize
2.5MB

Download
memory/1776-23-0x0000000000000000-mapping.dmp

Download
memory/1792-5-0x0000000075AE1000-0x0000000075AE3000-memory.dmp

Filesize
8KB

Download
memory/1916-14-0x000000000041D070-mapping.dmp

Download
memory/1916-20-0x00000000003D0000-0x00000000003E1000-memory.dmp

Filesize
68KB

Download
memory/1916-17-0x0000000000180000-0x0000000000191000-memory.dmp

Filesize
68KB

Download
memory/1916-19-0x0000000000770000-0x0000000000A73000-memory.dmp

Filesize
3.0MB

Download
memory/1916-16-0x0000000000400000-0x0000000000429000-memory.dmp

Filesize
164KB

Download
memory/1924-2-0x000000002FB41000-0x000000002FB44000-memory.dmp

Filesize
12KB

Download
memory/1924-4-0x000000005FFF0000-0x0000000060000000-memory.dmp

Filesize
64KB

Download
memory/1924-3-0x0000000071821000-0x0000000071823000-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