formbook | a361c3ef57783d4012857a289d088c19682187bb0b6f15eabb73865d1d54e180

General

Target

payment invoice.exe
Size

179KB
MD5

3b2135422ad7974f674d9e3afffa04e7
SHA1

e8a7ab8aea4ba52a5af377e4e77c983d9be2db7a
SHA256

a361c3ef57783d4012857a289d088c19682187bb0b6f15eabb73865d1d54e180
SHA512

c708e169d34d54fa0fb104d553b967c7748ab31602c622c96f880916af36d53a493e6aeef55b9e6aa0e4450487b1089c85af037fb6fb9af73936e05931f2e3c6

Score

10^/10

persistence spyware evasion trojan stealer formbook

Malware Config

Signatures

Suspicious use of FindShellTrayWindow 5 IoCs

pid	Process
1264	Explorer.EXE
1264	Explorer.EXE
1264	Explorer.EXE
1264	Explorer.EXE
1264	Explorer.EXE

Suspicious use of SendNotifyMessage 4 IoCs

pid	Process
1264	Explorer.EXE
1264	Explorer.EXE
1264	Explorer.EXE
1264	Explorer.EXE

Formbook
Formbook is a data stealing malware which is capable of stealing data.
trojan spyware stealer formbook

Enumerates system info in registry 2 TTPs 1 IoCs

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\Identifier	chkdsk.exe

Suspicious behavior: EnumeratesProcesses 30 IoCs

pid	Process
616	payment invoice.exe
616	payment invoice.exe
1260	chkdsk.exe
1260	chkdsk.exe
1260	chkdsk.exe
1260	chkdsk.exe
1260	chkdsk.exe
1260	chkdsk.exe
1260	chkdsk.exe
1260	chkdsk.exe
1260	chkdsk.exe
1260	chkdsk.exe
1260	chkdsk.exe
1260	chkdsk.exe
1260	chkdsk.exe
1260	chkdsk.exe
1260	chkdsk.exe
1260	chkdsk.exe
1260	chkdsk.exe
1260	chkdsk.exe
1260	chkdsk.exe
1260	chkdsk.exe
1260	chkdsk.exe
1260	chkdsk.exe
1260	chkdsk.exe
1260	chkdsk.exe
1260	chkdsk.exe
1260	chkdsk.exe
1260	chkdsk.exe
1260	chkdsk.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 616 set thread context of 1264	616	payment invoice.exe	20
PID 1260 set thread context of 1264	1260	chkdsk.exe	20

Deletes itself 1 IoCs

pid	Process
1428	cmd.exe

Modifies Internet Explorer settings 1 TTPs 1 IoCs

adware spyware

Modify Registry

T1112

description	ioc	Process
Key created	\Registry\User\S-1-5-21-1131729243-447456001-3632642222-1000\SOFTWARE\Microsoft\Internet Explorer\IntelliForms\Storage2	chkdsk.exe

Checks whether UAC is enabled 1 TTPs 1 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	Explorer.EXE

Suspicious behavior: MapViewOfSection 7 IoCs

pid	Process
616	payment invoice.exe
616	payment invoice.exe
616	payment invoice.exe
1260	chkdsk.exe
1260	chkdsk.exe
1260	chkdsk.exe
1260	chkdsk.exe

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

Data from Local System
T1005

Credentials in Files
T1081

Drops file in Program Files directory 1 IoCs

description	ioc	Process
File opened for modification	C:\Program Files (x86)\Tnpwdbb\winqzp.exe	chkdsk.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	616	payment invoice.exe
Token: SeDebugPrivilege	1260	chkdsk.exe
Token: SeShutdownPrivilege	1264	Explorer.EXE

Suspicious use of WriteProcessMemory 13 IoCs

description	pid	Process	procid_target
PID 1264 wrote to memory of 1260	1264	Explorer.EXE	24
PID 1264 wrote to memory of 1260	1264	Explorer.EXE	24
PID 1264 wrote to memory of 1260	1264	Explorer.EXE	24
PID 1264 wrote to memory of 1260	1264	Explorer.EXE	24
PID 1260 wrote to memory of 1428	1260	chkdsk.exe	25
PID 1260 wrote to memory of 1428	1260	chkdsk.exe	25
PID 1260 wrote to memory of 1428	1260	chkdsk.exe	25
PID 1260 wrote to memory of 1428	1260	chkdsk.exe	25
PID 1260 wrote to memory of 1512	1260	chkdsk.exe	28
PID 1260 wrote to memory of 1512	1260	chkdsk.exe	28
PID 1260 wrote to memory of 1512	1260	chkdsk.exe	28
PID 1260 wrote to memory of 1512	1260	chkdsk.exe	28
PID 1260 wrote to memory of 1512	1260	chkdsk.exe	28

System policy modification 1 TTPs 1 IoCs

evasion

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer	chkdsk.exe

Adds Run entry to policy start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	chkdsk.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\XX4TNFW8_FC = "C:\\Program Files (x86)\\Tnpwdbb\\winqzp.exe"	chkdsk.exe

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Checks whether UAC is enabled
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1264
- C:\Users\Admin\AppData\Local\Temp\payment invoice.exe
  "C:\Users\Admin\AppData\Local\Temp\payment invoice.exe"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of SetThreadContext
  - Suspicious behavior: MapViewOfSection
  - Suspicious use of AdjustPrivilegeToken
  PID:616
- C:\Windows\SysWOW64\chkdsk.exe
  "C:\Windows\SysWOW64\chkdsk.exe"
  2⤵
  - Enumerates system info in registry
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of SetThreadContext
  - Modifies Internet Explorer settings
  - Suspicious behavior: MapViewOfSection
  - Drops file in Program Files directory
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  - System policy modification
  - Adds Run entry to policy start application
  PID:1260
- - C:\Windows\SysWOW64\cmd.exe
    /c del "C:\Users\Admin\AppData\Local\Temp\payment invoice.exe"
    3⤵
    - Deletes itself
    PID:1428
- - C:\Program Files\Mozilla Firefox\Firefox.exe
    "C:\Program Files\Mozilla Firefox\Firefox.exe"
    3⤵
    PID:1512

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

3

T1112

Credential Access

Credentials in Files

1

T1081

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

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Downloads

memory/1260-3-0x0000000001E50000-0x0000000001F34000-memory.dmp

Filesize
912KB

Download
memory/1260-5-0x0000000076A70000-0x0000000076B8D000-memory.dmp

Filesize
1.1MB

Download
memory/1260-11-0x0000000003920000-0x0000000003A9F000-memory.dmp

Filesize
1.5MB

Download
memory/1260-4-0x0000000075760000-0x000000007576C000-memory.dmp

Filesize
48KB

Download
memory/1260-1-0x0000000000020000-0x0000000000027000-memory.dmp

Filesize
28KB

Download
memory/1512-13-0x000000013F640000-0x000000013F6D3000-memory.dmp

Filesize
588KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads