formbook | 8eab152e98f112c4706065bc1019945d06578407cf72b44db8687e8cdb2c7643

General

Target

tmp.exe
Size

786KB
MD5

c2f01c67a0c58c003471e245e1f57c8d
SHA1

89fe34fa4f3842bed5a54d766ad42f4ec2c06388
SHA256

8eab152e98f112c4706065bc1019945d06578407cf72b44db8687e8cdb2c7643
SHA512

9721edb7328d6a1d47a3d7c3f61ef075f29f156c5047b23281d5eae70708bcf17933a53f2adf73e0161f18b5231681582b92092ab24243215b86bab313ca3894

Score

10^/10

formbook xloader zzun loader persistence rat spyware stealer suricata trojan

Malware Config

Extracted

Family

xloader

Version

2.9

Campaign

zzun

Decoy

JnNtRHyNupy0GqRzAcasu7hb4rc=

Qv593NGLE7p9UNSaVkPXljAJm2QCNnc=

ePArIFWvjkkMgVEVhw4M4Jk=

26rqUwJ7dD0AiDI=

pBAxMHeK741QFw==

kHD7TPt5846pUMTX

56UnjFjHL1i0j659h3LymRnHpQj+SshC

4vKlKHflPqmWXRbrRwfPtrhb4rc=

6LBd4qButFAi

phMzGll8Ue7Fu+inq5cdnPaSugG3

NKswiQGCvZoG5FgsdHEI

rtTHnuUY8M1qVcXV

SOmECrlAt2oGAA==

L1ep9adutFAi

/UE+/AyvE6uEl28weFI=

IP+xMPQxJR4NE6TK

xvW5GN9/rqA5YUoOVt185Sf7Uw==

fRFNW9DhxL6VF7LA

KFYTfkaY741QFw==

W4JGvMBmt2oGAA==

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
suricata: ET MALWARE FormBook CnC Checkin (GET)
suricata: ET MALWARE FormBook CnC Checkin (GET)
suricata

Xloader Payload 5 IoCs

rat

Processes:

resource	yara_rule
behavioral1/memory/1740-62-0x0000000000400000-0x000000000042C000-memory.dmp	xloader
behavioral1/memory/1740-63-0x000000000041F6F0-mapping.dmp	xloader
behavioral1/memory/1740-69-0x0000000000400000-0x000000000042C000-memory.dmp	xloader
behavioral1/memory/1744-73-0x0000000000090000-0x00000000000BC000-memory.dmp	xloader
behavioral1/memory/1744-77-0x0000000000090000-0x00000000000BC000-memory.dmp	xloader

Adds policy Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

rundll32.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	rundll32.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\JXMXV4TPDV5 = "C:\\Program Files (x86)\\Ktbcdzlnh\\igfxnnhp.exe"	rundll32.exe

Checks computer location settings 2 TTPs 1 IoCs
Looks up country code configured in the registry, likely geofence.

Query Registry
T1012

System Information Discovery
T1082

Processes:

tmp.exe

description ioc process

Key value queried \REGISTRY\USER\S-1-5-21-1819626980-2277161760-1023733287-1000\Control Panel\International\Geo\Nation tmp.exe
Deletes itself 1 IoCs

Processes:

cmd.exe

pid process

1848 cmd.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

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-1819626980-2277161760-1023733287-1000\Control Panel\International\Geo\Nation	tmp.exe

pid	process
1848	cmd.exe

Suspicious use of SetThreadContext 3 IoCs

Processes:

tmp.exetmp.exerundll32.exe

description	pid	process	target process
PID 1552 set thread context of 1740	1552	tmp.exe	tmp.exe
PID 1740 set thread context of 1204	1740	tmp.exe	Explorer.EXE
PID 1744 set thread context of 1204	1744	rundll32.exe	Explorer.EXE

Drops file in Program Files directory 1 IoCs

Processes:

rundll32.exe

description ioc process

File opened for modification C:\Program Files (x86)\Ktbcdzlnh\igfxnnhp.exe rundll32.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

description	ioc	process
File opened for modification	C:\Program Files (x86)\Ktbcdzlnh\igfxnnhp.exe	rundll32.exe

Modifies Internet Explorer settings 1 TTPs 1 IoCs

adware spyware

Modify Registry

T1112

Processes:

rundll32.exe

description	ioc	process
Key created	\Registry\User\S-1-5-21-1819626980-2277161760-1023733287-1000\SOFTWARE\Microsoft\Internet Explorer\IntelliForms\Storage2	rundll32.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

Processes:

tmp.exetmp.exerundll32.exe

pid	process
1552	tmp.exe
1552	tmp.exe
1740	tmp.exe
1740	tmp.exe
1744	rundll32.exe
1744	rundll32.exe
1744	rundll32.exe
1744	rundll32.exe
1744	rundll32.exe
1744	rundll32.exe
1744	rundll32.exe
1744	rundll32.exe
1744	rundll32.exe
1744	rundll32.exe
1744	rundll32.exe
1744	rundll32.exe
1744	rundll32.exe
1744	rundll32.exe
1744	rundll32.exe
1744	rundll32.exe
1744	rundll32.exe
1744	rundll32.exe
1744	rundll32.exe

Suspicious behavior: MapViewOfSection 7 IoCs

Processes:

tmp.exerundll32.exe

pid process

1740 tmp.exe
1740 tmp.exe
1740 tmp.exe
1744 rundll32.exe
1744 rundll32.exe
1744 rundll32.exe
1744 rundll32.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

tmp.exetmp.exerundll32.exe

description pid process

Token: SeDebugPrivilege 1552 tmp.exe
Token: SeDebugPrivilege 1740 tmp.exe
Token: SeDebugPrivilege 1744 rundll32.exe
Suspicious use of FindShellTrayWindow 2 IoCs

Processes:

Explorer.EXE

pid process

1204 Explorer.EXE
1204 Explorer.EXE
Suspicious use of SendNotifyMessage 2 IoCs

Processes:

Explorer.EXE

pid process

1204 Explorer.EXE
1204 Explorer.EXE

pid	process
1740	tmp.exe
1740	tmp.exe
1740	tmp.exe
1744	rundll32.exe
1744	rundll32.exe
1744	rundll32.exe
1744	rundll32.exe

description	pid	process
Token: SeDebugPrivilege	1552	tmp.exe
Token: SeDebugPrivilege	1740	tmp.exe
Token: SeDebugPrivilege	1744	rundll32.exe

pid	process
1204	Explorer.EXE
1204	Explorer.EXE

pid	process
1204	Explorer.EXE
1204	Explorer.EXE

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

tmp.exeExplorer.EXErundll32.exe

description	pid	process	target process
PID 1552 wrote to memory of 1740	1552	tmp.exe	tmp.exe
PID 1552 wrote to memory of 1740	1552	tmp.exe	tmp.exe
PID 1552 wrote to memory of 1740	1552	tmp.exe	tmp.exe
PID 1552 wrote to memory of 1740	1552	tmp.exe	tmp.exe
PID 1552 wrote to memory of 1740	1552	tmp.exe	tmp.exe
PID 1552 wrote to memory of 1740	1552	tmp.exe	tmp.exe
PID 1552 wrote to memory of 1740	1552	tmp.exe	tmp.exe
PID 1204 wrote to memory of 1744	1204	Explorer.EXE	rundll32.exe
PID 1204 wrote to memory of 1744	1204	Explorer.EXE	rundll32.exe
PID 1204 wrote to memory of 1744	1204	Explorer.EXE	rundll32.exe
PID 1204 wrote to memory of 1744	1204	Explorer.EXE	rundll32.exe
PID 1204 wrote to memory of 1744	1204	Explorer.EXE	rundll32.exe
PID 1204 wrote to memory of 1744	1204	Explorer.EXE	rundll32.exe
PID 1204 wrote to memory of 1744	1204	Explorer.EXE	rundll32.exe
PID 1744 wrote to memory of 1848	1744	rundll32.exe	cmd.exe
PID 1744 wrote to memory of 1848	1744	rundll32.exe	cmd.exe
PID 1744 wrote to memory of 1848	1744	rundll32.exe	cmd.exe
PID 1744 wrote to memory of 1848	1744	rundll32.exe	cmd.exe
PID 1744 wrote to memory of 1536	1744	rundll32.exe	Firefox.exe
PID 1744 wrote to memory of 1536	1744	rundll32.exe	Firefox.exe
PID 1744 wrote to memory of 1536	1744	rundll32.exe	Firefox.exe
PID 1744 wrote to memory of 1536	1744	rundll32.exe	Firefox.exe
PID 1744 wrote to memory of 1536	1744	rundll32.exe	Firefox.exe

System policy modification 1 TTPs 1 IoCs
evasion

Modify Registry
T1112

Processes:

rundll32.exe

description ioc process

Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer rundll32.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer	rundll32.exe

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:1204

C:\Users\Admin\AppData\Local\Temp\tmp.exe
"C:\Users\Admin\AppData\Local\Temp\tmp.exe"
2⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1552

C:\Users\Admin\AppData\Local\Temp\tmp.exe
"{path}"
3⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
PID:1740

C:\Windows\SysWOW64\rundll32.exe
"C:\Windows\SysWOW64\rundll32.exe"
2⤵
- Adds policy Run key to start application
- Suspicious use of SetThreadContext
- Drops file in Program Files directory
- Modifies Internet Explorer settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- System policy modification
PID:1744

C:\Windows\SysWOW64\cmd.exe
/c del "C:\Users\Admin\AppData\Local\Temp\tmp.exe"
3⤵
- Deletes itself
PID:1848

C:\Program Files\Mozilla Firefox\Firefox.exe
"C:\Program Files\Mozilla Firefox\Firefox.exe"
3⤵
PID:1536

Network

MITRE ATT&CK Matrix ATT&CK 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

Exfiltration

Command and Control

Impact

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Downloads

memory/1204-78-0x0000000004CB0000-0x0000000004DB5000-memory.dmp

Filesize
1.0MB

Download
memory/1204-76-0x0000000004CB0000-0x0000000004DB5000-memory.dmp

Filesize
1.0MB

Download
memory/1204-67-0x0000000004A90000-0x0000000004BC8000-memory.dmp

Filesize
1.2MB

Download
memory/1552-54-0x00000000009C0000-0x0000000000A8A000-memory.dmp

Filesize
808KB

Download
memory/1552-55-0x0000000075B61000-0x0000000075B63000-memory.dmp

Filesize
8KB

Download
memory/1552-56-0x0000000000560000-0x000000000056A000-memory.dmp

Filesize
40KB

Download
memory/1552-57-0x00000000064B0000-0x0000000006536000-memory.dmp

Filesize
536KB

Download
memory/1552-58-0x00000000006F0000-0x0000000000722000-memory.dmp

Filesize
200KB

Download
memory/1740-66-0x0000000000180000-0x0000000000191000-memory.dmp

Filesize
68KB

Download
memory/1740-65-0x0000000000C20000-0x0000000000F23000-memory.dmp

Filesize
3.0MB

Download
memory/1740-63-0x000000000041F6F0-mapping.dmp

Download
memory/1740-62-0x0000000000400000-0x000000000042C000-memory.dmp

Filesize
176KB

Download
memory/1740-59-0x0000000000400000-0x000000000042C000-memory.dmp

Filesize
176KB

Download
memory/1740-69-0x0000000000400000-0x000000000042C000-memory.dmp

Filesize
176KB

Download
memory/1740-60-0x0000000000400000-0x000000000042C000-memory.dmp

Filesize
176KB

Download
memory/1744-72-0x0000000000C80000-0x0000000000C8E000-memory.dmp

Filesize
56KB

Download
memory/1744-73-0x0000000000090000-0x00000000000BC000-memory.dmp

Filesize
176KB

Download
memory/1744-74-0x0000000002220000-0x0000000002523000-memory.dmp

Filesize
3.0MB

Download
memory/1744-75-0x0000000000460000-0x00000000004F0000-memory.dmp

Filesize
576KB

Download
memory/1744-77-0x0000000000090000-0x00000000000BC000-memory.dmp

Filesize
176KB

Download
memory/1744-68-0x0000000000000000-mapping.dmp

Download
memory/1848-71-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads