formbook | 4f8799e5441c553ebbda342b6b06356a70dc432e5ac0434f4158146520b57ab7

General

Target

9284392fd96b31b3de8d8f664de3f0e4.exe
Size

436KB
MD5

9284392fd96b31b3de8d8f664de3f0e4
SHA1

9b2e8d834a7e50ec7e674433d019dbd19996036c
SHA256

4f8799e5441c553ebbda342b6b06356a70dc432e5ac0434f4158146520b57ab7
SHA512

61efcc329ba8f50c32de43ba0bfc66e6591158c12fcb095dfa3652e54fc799255a49e44c62f2022b807d51b432050f85d94a172dc0e186af40a21e3848c7c922

Score

10^/10

formbook o4ms persistence rat spyware stealer trojan

Malware Config

Extracted

Family

formbook

Version

4.1

Campaign

o4ms

C2

http://www.nocodehost.com/o4ms/

Decoy

fishingboatpub.com

trebor72.com

qualitycleanaustralia.com

amphilykenyx.com

jayte90.net

alveegrace.com

le-fleursoleil.com

volumoffer.com

businessbookwriters.com

alpin-art.com

firsttastetogo.com

catofc.com

ref-290.com

sbo2008.com

fortlauderdaleelevators.com

shanghaiyalian.com

majestybags.com

afcerd.com

myceliated.com

ls0a.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
behavioral2/memory/1280-122-0x000000000041EAB0-mapping.dmp	formbook
behavioral2/memory/1280-123-0x00000000001A0000-0x00000000001CE000-memory.dmp	formbook
behavioral2/memory/416-137-0x000000000041EAB0-mapping.dmp	formbook
behavioral2/memory/1440-144-0x00000000031B0000-0x00000000031DE000-memory.dmp	formbook

Adds policy Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

cmd.exe

description	ioc	process
Key created	\Registry\User\S-1-5-21-1594587808-2047097707-2163810515-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	cmd.exe

Executes dropped EXE 2 IoCs

Processes:

browse.exebrowse.exe

pid process

4024 browse.exe
416 browse.exe
Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081

pid	process
4024	browse.exe
416	browse.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

cmd.exe

description	ioc	process
Key created	\Registry\User\S-1-5-21-1594587808-2047097707-2163810515-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run	cmd.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000\Software\Microsoft\Windows\CurrentVersion\Run\TJRT308XS274 = "C:\\Users\\Admin\\AppData\\Roaming\\browse\\browse.exe"	cmd.exe

Suspicious use of SetThreadContext 4 IoCs

Processes:

9284392fd96b31b3de8d8f664de3f0e4.exebrowse.exebrowse.execmd.exe

description	pid	process	target process
PID 740 set thread context of 1280	740	9284392fd96b31b3de8d8f664de3f0e4.exe	9284392fd96b31b3de8d8f664de3f0e4.exe
PID 4024 set thread context of 416	4024	browse.exe	browse.exe
PID 416 set thread context of 2536	416	browse.exe	Explorer.EXE
PID 1440 set thread context of 2536	1440	cmd.exe	Explorer.EXE

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

System Information Discovery
T1082
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

1512 1280 WerFault.exe 9284392fd96b31b3de8d8f664de3f0e4.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

1316 schtasks.exe

pid	pid_target	process	target process
1512	1280	WerFault.exe	9284392fd96b31b3de8d8f664de3f0e4.exe

pid	process
1316	schtasks.exe

Modifies Internet Explorer settings 1 TTPs 1 IoCs

adware spyware

Modify Registry

T1112

Processes:

cmd.exe

description	ioc	process
Key created	\Registry\User\S-1-5-21-1594587808-2047097707-2163810515-1000\SOFTWARE\Microsoft\Internet Explorer\IntelliForms\Storage2	cmd.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

Processes:

WerFault.exebrowse.execmd.exe

pid	process
1512	WerFault.exe
1512	WerFault.exe
1512	WerFault.exe
1512	WerFault.exe
1512	WerFault.exe
1512	WerFault.exe
1512	WerFault.exe
1512	WerFault.exe
1512	WerFault.exe
1512	WerFault.exe
1512	WerFault.exe
1512	WerFault.exe
1512	WerFault.exe
416	browse.exe
416	browse.exe
416	browse.exe
416	browse.exe
1440	cmd.exe
1440	cmd.exe
1440	cmd.exe
1440	cmd.exe
1440	cmd.exe
1440	cmd.exe

Suspicious behavior: MapViewOfSection 7 IoCs

Processes:

browse.execmd.exe

pid process

416 browse.exe
416 browse.exe
416 browse.exe
1440 cmd.exe
1440 cmd.exe
1440 cmd.exe
1440 cmd.exe

pid	process
416	browse.exe
416	browse.exe
416	browse.exe
1440	cmd.exe
1440	cmd.exe
1440	cmd.exe
1440	cmd.exe

Suspicious use of AdjustPrivilegeToken 11 IoCs

Processes:

9284392fd96b31b3de8d8f664de3f0e4.exeWerFault.exebrowse.exebrowse.execmd.exeExplorer.EXE

description	pid	process
Token: SeDebugPrivilege	740	9284392fd96b31b3de8d8f664de3f0e4.exe
Token: SeRestorePrivilege	1512	WerFault.exe
Token: SeBackupPrivilege	1512	WerFault.exe
Token: SeDebugPrivilege	1512	WerFault.exe
Token: SeDebugPrivilege	4024	browse.exe
Token: SeDebugPrivilege	416	browse.exe
Token: SeDebugPrivilege	1440	cmd.exe
Token: SeShutdownPrivilege	2536	Explorer.EXE
Token: SeCreatePagefilePrivilege	2536	Explorer.EXE
Token: SeShutdownPrivilege	2536	Explorer.EXE
Token: SeCreatePagefilePrivilege	2536	Explorer.EXE

Suspicious use of WriteProcessMemory 27 IoCs

Processes:

9284392fd96b31b3de8d8f664de3f0e4.execmd.exebrowse.exeExplorer.EXEcmd.exe

description	pid	process	target process
PID 740 wrote to memory of 1280	740	9284392fd96b31b3de8d8f664de3f0e4.exe	9284392fd96b31b3de8d8f664de3f0e4.exe
PID 740 wrote to memory of 1280	740	9284392fd96b31b3de8d8f664de3f0e4.exe	9284392fd96b31b3de8d8f664de3f0e4.exe
PID 740 wrote to memory of 1280	740	9284392fd96b31b3de8d8f664de3f0e4.exe	9284392fd96b31b3de8d8f664de3f0e4.exe
PID 740 wrote to memory of 1280	740	9284392fd96b31b3de8d8f664de3f0e4.exe	9284392fd96b31b3de8d8f664de3f0e4.exe
PID 740 wrote to memory of 1280	740	9284392fd96b31b3de8d8f664de3f0e4.exe	9284392fd96b31b3de8d8f664de3f0e4.exe
PID 740 wrote to memory of 1280	740	9284392fd96b31b3de8d8f664de3f0e4.exe	9284392fd96b31b3de8d8f664de3f0e4.exe
PID 740 wrote to memory of 2188	740	9284392fd96b31b3de8d8f664de3f0e4.exe	cmd.exe
PID 740 wrote to memory of 2188	740	9284392fd96b31b3de8d8f664de3f0e4.exe	cmd.exe
PID 740 wrote to memory of 2188	740	9284392fd96b31b3de8d8f664de3f0e4.exe	cmd.exe
PID 740 wrote to memory of 2576	740	9284392fd96b31b3de8d8f664de3f0e4.exe	cmd.exe
PID 740 wrote to memory of 2576	740	9284392fd96b31b3de8d8f664de3f0e4.exe	cmd.exe
PID 740 wrote to memory of 2576	740	9284392fd96b31b3de8d8f664de3f0e4.exe	cmd.exe
PID 2188 wrote to memory of 1316	2188	cmd.exe	schtasks.exe
PID 2188 wrote to memory of 1316	2188	cmd.exe	schtasks.exe
PID 2188 wrote to memory of 1316	2188	cmd.exe	schtasks.exe
PID 4024 wrote to memory of 416	4024	browse.exe	browse.exe
PID 4024 wrote to memory of 416	4024	browse.exe	browse.exe
PID 4024 wrote to memory of 416	4024	browse.exe	browse.exe
PID 4024 wrote to memory of 416	4024	browse.exe	browse.exe
PID 4024 wrote to memory of 416	4024	browse.exe	browse.exe
PID 4024 wrote to memory of 416	4024	browse.exe	browse.exe
PID 2536 wrote to memory of 1440	2536	Explorer.EXE	cmd.exe
PID 2536 wrote to memory of 1440	2536	Explorer.EXE	cmd.exe
PID 2536 wrote to memory of 1440	2536	Explorer.EXE	cmd.exe
PID 1440 wrote to memory of 2232	1440	cmd.exe	Firefox.exe
PID 1440 wrote to memory of 2232	1440	cmd.exe	Firefox.exe
PID 1440 wrote to memory of 2232	1440	cmd.exe	Firefox.exe

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2536

C:\Users\Admin\AppData\Local\Temp\9284392fd96b31b3de8d8f664de3f0e4.exe
"C:\Users\Admin\AppData\Local\Temp\9284392fd96b31b3de8d8f664de3f0e4.exe"
2⤵
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:740

C:\Users\Admin\AppData\Local\Temp\9284392fd96b31b3de8d8f664de3f0e4.exe
"C:\Users\Admin\AppData\Local\Temp\9284392fd96b31b3de8d8f664de3f0e4.exe"
3⤵
PID:1280

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 1280 -s 188
4⤵
- Program crash
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1512

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c schtasks /create /sc minute /mo 1 /tn "Nano" /tr "'C:\Users\Admin\AppData\Roaming\browse\browse.exe'" /f
3⤵
- Suspicious use of WriteProcessMemory
PID:2188

C:\Windows\SysWOW64\schtasks.exe
schtasks /create /sc minute /mo 1 /tn "Nano" /tr "'C:\Users\Admin\AppData\Roaming\browse\browse.exe'" /f
4⤵
- Creates scheduled task(s)
PID:1316

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /c copy "C:\Users\Admin\AppData\Local\Temp\9284392fd96b31b3de8d8f664de3f0e4.exe" "C:\Users\Admin\AppData\Roaming\browse\browse.exe"
3⤵
PID:2576

C:\Windows\SysWOW64\autoconv.exe
"C:\Windows\SysWOW64\autoconv.exe"
2⤵
PID:2300

C:\Windows\SysWOW64\autoconv.exe
"C:\Windows\SysWOW64\autoconv.exe"
2⤵
PID:3036

C:\Windows\SysWOW64\autoconv.exe
"C:\Windows\SysWOW64\autoconv.exe"
2⤵
PID:3932

C:\Windows\SysWOW64\autoconv.exe
"C:\Windows\SysWOW64\autoconv.exe"
2⤵
PID:3700

C:\Windows\SysWOW64\autoconv.exe
"C:\Windows\SysWOW64\autoconv.exe"
2⤵
PID:1540

C:\Windows\SysWOW64\autoconv.exe
"C:\Windows\SysWOW64\autoconv.exe"
2⤵
PID:2252

C:\Windows\SysWOW64\autoconv.exe
"C:\Windows\SysWOW64\autoconv.exe"
2⤵
PID:3236

C:\Windows\SysWOW64\autoconv.exe
"C:\Windows\SysWOW64\autoconv.exe"
2⤵
PID:8

C:\Windows\SysWOW64\autoconv.exe
"C:\Windows\SysWOW64\autoconv.exe"
2⤵
PID:2976

C:\Windows\SysWOW64\autoconv.exe
"C:\Windows\SysWOW64\autoconv.exe"
2⤵
PID:3412

C:\Windows\SysWOW64\autoconv.exe
"C:\Windows\SysWOW64\autoconv.exe"
2⤵
PID:2516

C:\Windows\SysWOW64\autoconv.exe
"C:\Windows\SysWOW64\autoconv.exe"
2⤵
PID:2100

C:\Windows\SysWOW64\autoconv.exe
"C:\Windows\SysWOW64\autoconv.exe"
2⤵
PID:2072

C:\Windows\SysWOW64\autoconv.exe
"C:\Windows\SysWOW64\autoconv.exe"
2⤵
PID:2148

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\SysWOW64\cmd.exe"
2⤵
- Adds policy Run key to start application
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Modifies Internet Explorer settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1440

C:\Program Files\Mozilla Firefox\Firefox.exe
"C:\Program Files\Mozilla Firefox\Firefox.exe"
3⤵
PID:2232

C:\Users\Admin\AppData\Roaming\browse\browse.exe
C:\Users\Admin\AppData\Roaming\browse\browse.exe
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4024

C:\Users\Admin\AppData\Roaming\browse\browse.exe
"C:\Users\Admin\AppData\Roaming\browse\browse.exe"
2⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
PID:416

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Registry Run Keys / Startup Folder

2

T1060

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Modify Registry

3

T1112

Credential Access

Credentials in Files

1

T1081

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Roaming\browse\browse.exe
MD5
9284392fd96b31b3de8d8f664de3f0e4

SHA1
9b2e8d834a7e50ec7e674433d019dbd19996036c

SHA256
4f8799e5441c553ebbda342b6b06356a70dc432e5ac0434f4158146520b57ab7

SHA512
61efcc329ba8f50c32de43ba0bfc66e6591158c12fcb095dfa3652e54fc799255a49e44c62f2022b807d51b432050f85d94a172dc0e186af40a21e3848c7c922

Download Submit
C:\Users\Admin\AppData\Roaming\browse\browse.exe
MD5
9284392fd96b31b3de8d8f664de3f0e4

SHA1
9b2e8d834a7e50ec7e674433d019dbd19996036c

SHA256
4f8799e5441c553ebbda342b6b06356a70dc432e5ac0434f4158146520b57ab7

SHA512
61efcc329ba8f50c32de43ba0bfc66e6591158c12fcb095dfa3652e54fc799255a49e44c62f2022b807d51b432050f85d94a172dc0e186af40a21e3848c7c922

Download Submit
C:\Users\Admin\AppData\Roaming\browse\browse.exe
MD5
9284392fd96b31b3de8d8f664de3f0e4

SHA1
9b2e8d834a7e50ec7e674433d019dbd19996036c

SHA256
4f8799e5441c553ebbda342b6b06356a70dc432e5ac0434f4158146520b57ab7

SHA512
61efcc329ba8f50c32de43ba0bfc66e6591158c12fcb095dfa3652e54fc799255a49e44c62f2022b807d51b432050f85d94a172dc0e186af40a21e3848c7c922

Download Submit
memory/416-139-0x0000000001170000-0x0000000001490000-memory.dmp

Filesize
3.1MB

Download
memory/416-140-0x0000000001150000-0x0000000001164000-memory.dmp

Filesize
80KB

Download
memory/416-137-0x000000000041EAB0-mapping.dmp

Download
memory/740-116-0x0000000005B40000-0x0000000005B41000-memory.dmp

Filesize
4KB

Download
memory/740-117-0x00000000056E0000-0x00000000056E1000-memory.dmp

Filesize
4KB

Download
memory/740-118-0x00000000057F0000-0x00000000057F1000-memory.dmp

Filesize
4KB

Download
memory/740-119-0x0000000005630000-0x0000000005631000-memory.dmp

Filesize
4KB

Download
memory/740-120-0x0000000005780000-0x0000000005781000-memory.dmp

Filesize
4KB

Download
memory/740-114-0x00000000000D0000-0x00000000000D1000-memory.dmp

Filesize
4KB

Download
memory/1280-122-0x000000000041EAB0-mapping.dmp

Download
memory/1280-123-0x00000000001A0000-0x00000000001CE000-memory.dmp

Filesize
184KB

Download
memory/1316-126-0x0000000000000000-mapping.dmp

Download
memory/1440-143-0x00000000002F0000-0x0000000000349000-memory.dmp

Filesize
356KB

Download
memory/1440-142-0x0000000000000000-mapping.dmp

Download
memory/1440-144-0x00000000031B0000-0x00000000031DE000-memory.dmp

Filesize
184KB

Download
memory/1440-145-0x00000000031E0000-0x000000000332A000-memory.dmp

Filesize
1.3MB

Download
memory/1440-146-0x0000000003850000-0x00000000038E3000-memory.dmp

Filesize
588KB

Download
memory/2188-124-0x0000000000000000-mapping.dmp

Download
memory/2232-148-0x0000000000000000-mapping.dmp

Download
memory/2536-141-0x0000000005570000-0x00000000056CE000-memory.dmp

Filesize
1.4MB

Download
memory/2536-147-0x00000000056D0000-0x00000000057C7000-memory.dmp

Filesize
988KB

Download
memory/2576-125-0x0000000000000000-mapping.dmp

Download
memory/4024-135-0x0000000005470000-0x0000000005471000-memory.dmp

Filesize
4KB

Download
memory/4024-129-0x0000000000A80000-0x0000000000A81000-memory.dmp

Filesize
4KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads