formbook | e01a44ecacb3c4c0e76c2708ad916ca81dba402b6e75a6fbef2874182af6c97f

General

Target

KYmFioOZjadXGyN.exe
Size

858KB
MD5

27083a2f76b59bee44401da75eaa2aa0
SHA1

fc43853029c2afe4caacada1406ac136a93e19b2
SHA256

e01a44ecacb3c4c0e76c2708ad916ca81dba402b6e75a6fbef2874182af6c97f
SHA512

b4228d82060d79b8568bed481e06d2734fe997bf1c0f3767ea237f90385cceed86237fa3039e30951df0d1f253aabc89d7b09d4b18ce50246f9400ab865c527d

Score

10^/10

formbook xloader zzun loader persistence rat spyware stealer 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

Xloader payload 5 IoCs

rat

Processes:

resource	yara_rule
behavioral1/memory/1552-62-0x0000000000400000-0x000000000042C000-memory.dmp	xloader
behavioral1/memory/1552-63-0x000000000041F6F0-mapping.dmp	xloader
behavioral1/memory/1552-65-0x0000000000400000-0x000000000042C000-memory.dmp	xloader
behavioral1/memory/1236-72-0x0000000000070000-0x000000000009C000-memory.dmp	xloader
behavioral1/memory/1236-76-0x0000000000070000-0x000000000009C000-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:

cscript.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\JHLTQVAHYJP = "C:\\Program Files (x86)\\Clffh6t1\\mselzx.exe"	cscript.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	cscript.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:

KYmFioOZjadXGyN.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-4084403625-2215941253-1760665084-1000\Control Panel\International\Geo\Nation	KYmFioOZjadXGyN.exe

Deletes itself 1 IoCs

Processes:

cmd.exe

pid process

532 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

pid	process
532	cmd.exe

Suspicious use of SetThreadContext 3 IoCs

Processes:

KYmFioOZjadXGyN.exeKYmFioOZjadXGyN.execscript.exe

description	pid	process	target process
PID 1768 set thread context of 1552	1768	KYmFioOZjadXGyN.exe	KYmFioOZjadXGyN.exe
PID 1552 set thread context of 1268	1552	KYmFioOZjadXGyN.exe	Explorer.EXE
PID 1236 set thread context of 1268	1236	cscript.exe	Explorer.EXE

Drops file in Program Files directory 1 IoCs

Processes:

cscript.exe

description ioc process

File opened for modification C:\Program Files (x86)\Clffh6t1\mselzx.exe cscript.exe

description	ioc	process
File opened for modification	C:\Program Files (x86)\Clffh6t1\mselzx.exe	cscript.exe

Modifies Internet Explorer settings 1 TTPs 1 IoCs

adware spyware

Modify Registry

T1112

Processes:

cscript.exe

description	ioc	process
Key created	\Registry\User\S-1-5-21-4084403625-2215941253-1760665084-1000\SOFTWARE\Microsoft\Internet Explorer\IntelliForms\Storage2	cscript.exe

Suspicious behavior: EnumeratesProcesses 21 IoCs

Processes:

KYmFioOZjadXGyN.execscript.exe

pid	process
1552	KYmFioOZjadXGyN.exe
1552	KYmFioOZjadXGyN.exe
1236	cscript.exe
1236	cscript.exe
1236	cscript.exe
1236	cscript.exe
1236	cscript.exe
1236	cscript.exe
1236	cscript.exe
1236	cscript.exe
1236	cscript.exe
1236	cscript.exe
1236	cscript.exe
1236	cscript.exe
1236	cscript.exe
1236	cscript.exe
1236	cscript.exe
1236	cscript.exe
1236	cscript.exe
1236	cscript.exe
1236	cscript.exe

Suspicious behavior: MapViewOfSection 7 IoCs

Processes:

KYmFioOZjadXGyN.execscript.exe

pid process

1552 KYmFioOZjadXGyN.exe
1552 KYmFioOZjadXGyN.exe
1552 KYmFioOZjadXGyN.exe
1236 cscript.exe
1236 cscript.exe
1236 cscript.exe
1236 cscript.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

KYmFioOZjadXGyN.execscript.exe

description pid process

Token: SeDebugPrivilege 1552 KYmFioOZjadXGyN.exe
Token: SeDebugPrivilege 1236 cscript.exe
Suspicious use of FindShellTrayWindow 2 IoCs

Processes:

Explorer.EXE

pid process

1268 Explorer.EXE
1268 Explorer.EXE
Suspicious use of SendNotifyMessage 2 IoCs

Processes:

Explorer.EXE

pid process

1268 Explorer.EXE
1268 Explorer.EXE

description	pid	process
Token: SeDebugPrivilege	1552	KYmFioOZjadXGyN.exe
Token: SeDebugPrivilege	1236	cscript.exe

pid	process
1268	Explorer.EXE
1268	Explorer.EXE

pid	process
1268	Explorer.EXE
1268	Explorer.EXE

Suspicious use of WriteProcessMemory 20 IoCs

Processes:

KYmFioOZjadXGyN.exeExplorer.EXEcscript.exe

description	pid	process	target process
PID 1768 wrote to memory of 1552	1768	KYmFioOZjadXGyN.exe	KYmFioOZjadXGyN.exe
PID 1768 wrote to memory of 1552	1768	KYmFioOZjadXGyN.exe	KYmFioOZjadXGyN.exe
PID 1768 wrote to memory of 1552	1768	KYmFioOZjadXGyN.exe	KYmFioOZjadXGyN.exe
PID 1768 wrote to memory of 1552	1768	KYmFioOZjadXGyN.exe	KYmFioOZjadXGyN.exe
PID 1768 wrote to memory of 1552	1768	KYmFioOZjadXGyN.exe	KYmFioOZjadXGyN.exe
PID 1768 wrote to memory of 1552	1768	KYmFioOZjadXGyN.exe	KYmFioOZjadXGyN.exe
PID 1768 wrote to memory of 1552	1768	KYmFioOZjadXGyN.exe	KYmFioOZjadXGyN.exe
PID 1268 wrote to memory of 1236	1268	Explorer.EXE	cscript.exe
PID 1268 wrote to memory of 1236	1268	Explorer.EXE	cscript.exe
PID 1268 wrote to memory of 1236	1268	Explorer.EXE	cscript.exe
PID 1268 wrote to memory of 1236	1268	Explorer.EXE	cscript.exe
PID 1236 wrote to memory of 532	1236	cscript.exe	cmd.exe
PID 1236 wrote to memory of 532	1236	cscript.exe	cmd.exe
PID 1236 wrote to memory of 532	1236	cscript.exe	cmd.exe
PID 1236 wrote to memory of 532	1236	cscript.exe	cmd.exe
PID 1236 wrote to memory of 1888	1236	cscript.exe	Firefox.exe
PID 1236 wrote to memory of 1888	1236	cscript.exe	Firefox.exe
PID 1236 wrote to memory of 1888	1236	cscript.exe	Firefox.exe
PID 1236 wrote to memory of 1888	1236	cscript.exe	Firefox.exe
PID 1236 wrote to memory of 1888	1236	cscript.exe	Firefox.exe

System policy modification 1 TTPs 1 IoCs
evasion

Modify Registry
T1112

Processes:

cscript.exe

description ioc process

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

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

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:1268

C:\Users\Admin\AppData\Local\Temp\KYmFioOZjadXGyN.exe
"C:\Users\Admin\AppData\Local\Temp\KYmFioOZjadXGyN.exe"
2⤵
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:1768

C:\Users\Admin\AppData\Local\Temp\KYmFioOZjadXGyN.exe
"{path}"
3⤵
- Checks computer location settings
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
PID:1552

C:\Windows\SysWOW64\cscript.exe
"C:\Windows\SysWOW64\cscript.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:1236

C:\Windows\SysWOW64\cmd.exe
/c del "C:\Users\Admin\AppData\Local\Temp\KYmFioOZjadXGyN.exe"
3⤵
- Deletes itself
PID:532

C:\Program Files\Mozilla Firefox\Firefox.exe
"C:\Program Files\Mozilla Firefox\Firefox.exe"
3⤵
PID:1888

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

1

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Exfiltration

Command and Control

Impact

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Downloads

memory/532-70-0x0000000000000000-mapping.dmp

Download
memory/1236-76-0x0000000000070000-0x000000000009C000-memory.dmp

Filesize
176KB

Download
memory/1236-74-0x0000000001E60000-0x0000000001EF0000-memory.dmp

Filesize
576KB

Download
memory/1236-73-0x0000000001FF0000-0x00000000022F3000-memory.dmp

Filesize
3.0MB

Download
memory/1236-72-0x0000000000070000-0x000000000009C000-memory.dmp

Filesize
176KB

Download
memory/1236-71-0x00000000008A0000-0x00000000008C2000-memory.dmp

Filesize
136KB

Download
memory/1236-69-0x0000000000000000-mapping.dmp

Download
memory/1268-68-0x0000000006AA0000-0x0000000006B87000-memory.dmp

Filesize
924KB

Download
memory/1268-77-0x00000000072B0000-0x00000000073BF000-memory.dmp

Filesize
1.1MB

Download
memory/1268-75-0x00000000072B0000-0x00000000073BF000-memory.dmp

Filesize
1.1MB

Download
memory/1552-59-0x0000000000400000-0x000000000042C000-memory.dmp

Filesize
176KB

Download
memory/1552-67-0x0000000000290000-0x00000000002A1000-memory.dmp

Filesize
68KB

Download
memory/1552-66-0x0000000000850000-0x0000000000B53000-memory.dmp

Filesize
3.0MB

Download
memory/1552-65-0x0000000000400000-0x000000000042C000-memory.dmp

Filesize
176KB

Download
memory/1552-63-0x000000000041F6F0-mapping.dmp

Download
memory/1552-62-0x0000000000400000-0x000000000042C000-memory.dmp

Filesize
176KB

Download
memory/1552-60-0x0000000000400000-0x000000000042C000-memory.dmp

Filesize
176KB

Download
memory/1768-54-0x00000000011D0000-0x00000000012AC000-memory.dmp

Filesize
880KB

Download
memory/1768-58-0x0000000000580000-0x00000000005B2000-memory.dmp

Filesize
200KB

Download
memory/1768-57-0x0000000005D50000-0x0000000005DD6000-memory.dmp

Filesize
536KB

Download
memory/1768-56-0x00000000004D0000-0x00000000004DA000-memory.dmp

Filesize
40KB

Download
memory/1768-55-0x00000000757E1000-0x00000000757E3000-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