formbook | a703fd2372483e4bbb75bc96dd4f0f95c489eede136451016106eb6c62636658

General

Target

BANK_LET.exe
Size

339KB
MD5

86bb43248e3ad56e9a839cc6c7b03282
SHA1

30afc80c7a9d14fb54cd799b2b2d552c9f2e138d
SHA256

286add28a79440668077a7d762ee81ee169f1c08daa27bc680dbf8c8832d2785
SHA512

17716ec8e1dbee062a3534eab62e0ba4b793ec94d6f64043493dfddb8424bd0d6a7d792e26d628f86d6acbf18ba671817d30ba243ebbac5a7b4255f8e19a6cc1

Score

10^/10

formbook 23v evasion rat spyware stealer trojan

Malware Config

Extracted

Family

formbook

Version

3.9

Campaign

23v

Decoy

1l4m-5qeh0cgx9a.com

portsel.com

vypnxg.men

renrenbaoshangcheng.com

hulebang.com

heatburnio.com

amazingthunderworks.com

quantumreapers.com

8801i.info

moonlightmanager.com

bqypm.info

backlinkbarato.com

jiudianhuixun.com

markerbio.net

empety.com

eternalkollection.com

teknoshift.com

petitenobel.net

zlmqv.info

emotionalcontrols.com

Signatures

Formbook
Formbook is a data stealing malware which is capable of stealing data.
trojan spyware stealer formbook
Modifies Windows Defender Real-time Protection settings 3 TTPs
evasion trojan

Modify Registry
T1112

Modify Existing Service
T1031

Disabling Security Tools
T1089

Formbook Payload 3 IoCs

rat

Processes:

resource	yara_rule
behavioral2/memory/116-149-0x0000000000400000-0x000000000042A000-memory.dmp	formbook
behavioral2/memory/116-151-0x0000000000400000-0x000000000042A000-memory.dmp	formbook
behavioral2/memory/4824-160-0x0000000000460000-0x000000000048A000-memory.dmp	formbook

Looks for VirtualBox Guest Additions in registry 2 TTPs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497
Looks for VMWare Tools registry key 2 TTPs
evasion

Query Registry
T1012

Virtualization/Sandbox Evasion
T1497

Checks BIOS information in registry 2 TTPs 2 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

Processes:

BANK_LET.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosVersion	BANK_LET.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\VideoBiosVersion	BANK_LET.exe

Windows security modification 2 TTPs 2 IoCs

evasion trojan

Disabling Security Tools

T1089

Modify Registry

T1112

Processes:

BANK_LET.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features	BANK_LET.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows Defender\Features\TamperProtection = "0"	BANK_LET.exe

Maps connected drives based on registry 3 TTPs 2 IoCs

Disk information is often read in order to detect sandboxing environments.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

Processes:

BANK_LET.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\Disk\Enum	BANK_LET.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\disk\Enum\0	BANK_LET.exe

Suspicious use of SetThreadContext 4 IoCs

Processes:

BANK_LET.exeBANK_LET.exerundll32.exe

description	pid	process	target process
PID 4416 set thread context of 116	4416	BANK_LET.exe	BANK_LET.exe
PID 116 set thread context of 2528	116	BANK_LET.exe	Explorer.EXE
PID 116 set thread context of 2528	116	BANK_LET.exe	Explorer.EXE
PID 4824 set thread context of 2528	4824	rundll32.exe	Explorer.EXE

Suspicious behavior: EnumeratesProcesses 28 IoCs

Processes:

powershell.exeBANK_LET.exerundll32.exe

pid	process
3840	powershell.exe
3840	powershell.exe
116	BANK_LET.exe
116	BANK_LET.exe
116	BANK_LET.exe
116	BANK_LET.exe
116	BANK_LET.exe
116	BANK_LET.exe
4824	rundll32.exe
4824	rundll32.exe
4824	rundll32.exe
4824	rundll32.exe
4824	rundll32.exe
4824	rundll32.exe
4824	rundll32.exe
4824	rundll32.exe
4824	rundll32.exe
4824	rundll32.exe
4824	rundll32.exe
4824	rundll32.exe
4824	rundll32.exe
4824	rundll32.exe
4824	rundll32.exe
4824	rundll32.exe
4824	rundll32.exe
4824	rundll32.exe
4824	rundll32.exe
4824	rundll32.exe

Suspicious behavior: MapViewOfSection 6 IoCs

Processes:

BANK_LET.exerundll32.exe

pid process

116 BANK_LET.exe
116 BANK_LET.exe
116 BANK_LET.exe
116 BANK_LET.exe
4824 rundll32.exe
4824 rundll32.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

powershell.exeBANK_LET.exerundll32.exe

description pid process

Token: SeDebugPrivilege 3840 powershell.exe
Token: SeDebugPrivilege 116 BANK_LET.exe
Token: SeDebugPrivilege 4824 rundll32.exe

pid	process
116	BANK_LET.exe
116	BANK_LET.exe
116	BANK_LET.exe
116	BANK_LET.exe
4824	rundll32.exe
4824	rundll32.exe

description	pid	process
Token: SeDebugPrivilege	3840	powershell.exe
Token: SeDebugPrivilege	116	BANK_LET.exe
Token: SeDebugPrivilege	4824	rundll32.exe

Suspicious use of WriteProcessMemory 15 IoCs

Processes:

BANK_LET.exeExplorer.EXErundll32.exe

description	pid	process	target process
PID 4416 wrote to memory of 3840	4416	BANK_LET.exe	powershell.exe
PID 4416 wrote to memory of 3840	4416	BANK_LET.exe	powershell.exe
PID 4416 wrote to memory of 3840	4416	BANK_LET.exe	powershell.exe
PID 4416 wrote to memory of 116	4416	BANK_LET.exe	BANK_LET.exe
PID 4416 wrote to memory of 116	4416	BANK_LET.exe	BANK_LET.exe
PID 4416 wrote to memory of 116	4416	BANK_LET.exe	BANK_LET.exe
PID 4416 wrote to memory of 116	4416	BANK_LET.exe	BANK_LET.exe
PID 4416 wrote to memory of 116	4416	BANK_LET.exe	BANK_LET.exe
PID 4416 wrote to memory of 116	4416	BANK_LET.exe	BANK_LET.exe
PID 2528 wrote to memory of 4824	2528	Explorer.EXE	rundll32.exe
PID 2528 wrote to memory of 4824	2528	Explorer.EXE	rundll32.exe
PID 2528 wrote to memory of 4824	2528	Explorer.EXE	rundll32.exe
PID 4824 wrote to memory of 536	4824	rundll32.exe	cmd.exe
PID 4824 wrote to memory of 536	4824	rundll32.exe	cmd.exe
PID 4824 wrote to memory of 536	4824	rundll32.exe	cmd.exe

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious use of WriteProcessMemory
PID:2528

C:\Users\Admin\AppData\Local\Temp\BANK_LET.exe
"C:\Users\Admin\AppData\Local\Temp\BANK_LET.exe"
2⤵
- Checks BIOS information in registry
- Windows security modification
- Maps connected drives based on registry
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4416

C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
"powershell" Get-MpPreference -verbose
3⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:3840

C:\Users\Admin\AppData\Local\Temp\BANK_LET.exe
"{path}"
3⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
PID:116

C:\Windows\SysWOW64\autochk.exe
"C:\Windows\SysWOW64\autochk.exe"
2⤵
PID:760

C:\Windows\SysWOW64\autochk.exe
"C:\Windows\SysWOW64\autochk.exe"
2⤵
PID:2312

C:\Windows\SysWOW64\autochk.exe
"C:\Windows\SysWOW64\autochk.exe"
2⤵
PID:1824

C:\Windows\SysWOW64\autochk.exe
"C:\Windows\SysWOW64\autochk.exe"
2⤵
PID:2104

C:\Windows\SysWOW64\autochk.exe
"C:\Windows\SysWOW64\autochk.exe"
2⤵
PID:612

C:\Windows\SysWOW64\rundll32.exe
"C:\Windows\SysWOW64\rundll32.exe"
2⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4824

C:\Windows\SysWOW64\cmd.exe
/c del "C:\Users\Admin\AppData\Local\Temp\BANK_LET.exe"
3⤵
PID:536

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Modify Existing Service

1

T1031

Privilege Escalation

Defense Evasion

Disabling Security Tools

Modify Registry

Virtualization/Sandbox Evasion

2

T1497

Credential Access

Discovery

Peripheral Device Discovery

Query Registry

System Information Discovery

2

T1082

Virtualization/Sandbox Evasion

2

T1497

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/116-148-0x0000000000000000-mapping.dmp

Download
memory/116-156-0x00000000031B0000-0x00000000031C4000-memory.dmp

Filesize
80KB

Download
memory/116-153-0x0000000001840000-0x0000000001854000-memory.dmp

Filesize
80KB

Download
memory/116-152-0x0000000001410000-0x000000000175A000-memory.dmp

Filesize
3.3MB

Download
memory/116-151-0x0000000000400000-0x000000000042A000-memory.dmp

Filesize
168KB

Download
memory/116-149-0x0000000000400000-0x000000000042A000-memory.dmp

Filesize
168KB

Download
memory/536-161-0x0000000000000000-mapping.dmp

Download
memory/2528-164-0x0000000003490000-0x0000000003541000-memory.dmp

Filesize
708KB

Download
memory/2528-157-0x00000000088F0000-0x0000000008A41000-memory.dmp

Filesize
1.3MB

Download
memory/2528-154-0x0000000003140000-0x000000000321F000-memory.dmp

Filesize
892KB

Download
memory/3840-138-0x0000000006EC0000-0x0000000006EF2000-memory.dmp

Filesize
200KB

Download
memory/3840-137-0x00000000069A0000-0x00000000069BE000-memory.dmp

Filesize
120KB

Download
memory/3840-142-0x0000000006FE0000-0x0000000006FFA000-memory.dmp

Filesize
104KB

Download
memory/3840-143-0x0000000007D20000-0x0000000007D2A000-memory.dmp

Filesize
40KB

Download
memory/3840-144-0x0000000007F30000-0x0000000007FC6000-memory.dmp

Filesize
600KB

Download
memory/3840-145-0x0000000007EE0000-0x0000000007EEE000-memory.dmp

Filesize
56KB

Download
memory/3840-146-0x0000000007FF0000-0x000000000800A000-memory.dmp

Filesize
104KB

Download
memory/3840-147-0x0000000007FD0000-0x0000000007FD8000-memory.dmp

Filesize
32KB

Download
memory/3840-140-0x0000000006EA0000-0x0000000006EBE000-memory.dmp

Filesize
120KB

Download
memory/3840-139-0x000000006E7E0000-0x000000006E82C000-memory.dmp

Filesize
304KB

Download
memory/3840-131-0x0000000000000000-mapping.dmp

Download
memory/3840-141-0x0000000008360000-0x00000000089DA000-memory.dmp

Filesize
6.5MB

Download
memory/3840-136-0x0000000006320000-0x0000000006386000-memory.dmp

Filesize
408KB

Download
memory/3840-135-0x0000000005C10000-0x0000000005C76000-memory.dmp

Filesize
408KB

Download
memory/3840-134-0x0000000005AE0000-0x0000000005B02000-memory.dmp

Filesize
136KB

Download
memory/3840-133-0x0000000005CF0000-0x0000000006318000-memory.dmp

Filesize
6.2MB

Download
memory/3840-132-0x0000000002FE0000-0x0000000003016000-memory.dmp

Filesize
216KB

Download
memory/4416-130-0x0000000074AC0000-0x0000000075071000-memory.dmp

Filesize
5.7MB

Download
memory/4824-160-0x0000000000460000-0x000000000048A000-memory.dmp

Filesize
168KB

Download
memory/4824-159-0x0000000000DC0000-0x0000000000DD4000-memory.dmp

Filesize
80KB

Download
memory/4824-158-0x0000000000000000-mapping.dmp

Download
memory/4824-162-0x00000000023A0000-0x00000000026EA000-memory.dmp

Filesize
3.3MB

Download
memory/4824-163-0x00000000021F0000-0x0000000002283000-memory.dmp

Filesize
588KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads