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 4 IoCs

rat

Processes:

resource	yara_rule
behavioral2/memory/4916-139-0x0000000000400000-0x000000000042C000-memory.dmp	xloader
behavioral2/memory/4916-141-0x0000000000400000-0x000000000042C000-memory.dmp	xloader
behavioral2/memory/4040-147-0x00000000008F0000-0x000000000091C000-memory.dmp	xloader
behavioral2/memory/4040-152-0x00000000008F0000-0x000000000091C000-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:

help.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	help.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\SPI4W8X0HPX = "C:\\Program Files (x86)\\Oyjotg8\\vz1xjfw0vr7.exe"	help.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-1-5-21-3463845317-933582289-45817732-1000\Control Panel\International\Geo\Nation	KYmFioOZjadXGyN.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

Suspicious use of SetThreadContext 3 IoCs

Processes:

KYmFioOZjadXGyN.exeKYmFioOZjadXGyN.exehelp.exe

description	pid	process	target process
PID 1444 set thread context of 4916	1444	KYmFioOZjadXGyN.exe	KYmFioOZjadXGyN.exe
PID 4916 set thread context of 2232	4916	KYmFioOZjadXGyN.exe	Explorer.EXE
PID 4040 set thread context of 2232	4040	help.exe	Explorer.EXE

Drops file in Program Files directory 1 IoCs

Processes:

help.exe

description ioc process

File opened for modification C:\Program Files (x86)\Oyjotg8\vz1xjfw0vr7.exe help.exe

description	ioc	process
File opened for modification	C:\Program Files (x86)\Oyjotg8\vz1xjfw0vr7.exe	help.exe

Modifies Internet Explorer settings 1 TTPs 1 IoCs

adware spyware

Modify Registry

T1112

Processes:

help.exe

description	ioc	process
Key created	\Registry\User\S-1-5-21-3463845317-933582289-45817732-1000\SOFTWARE\Microsoft\Internet Explorer\IntelliForms\Storage2	help.exe

Suspicious behavior: EnumeratesProcesses 46 IoCs

Processes:

KYmFioOZjadXGyN.exeKYmFioOZjadXGyN.exehelp.exe

pid	process
1444	KYmFioOZjadXGyN.exe
1444	KYmFioOZjadXGyN.exe
4916	KYmFioOZjadXGyN.exe
4916	KYmFioOZjadXGyN.exe
4916	KYmFioOZjadXGyN.exe
4916	KYmFioOZjadXGyN.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

Explorer.EXE

pid process

2232 Explorer.EXE
Suspicious behavior: MapViewOfSection 7 IoCs

Processes:

KYmFioOZjadXGyN.exehelp.exe

pid process

4916 KYmFioOZjadXGyN.exe
4916 KYmFioOZjadXGyN.exe
4916 KYmFioOZjadXGyN.exe
4040 help.exe
4040 help.exe
4040 help.exe
4040 help.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

KYmFioOZjadXGyN.exeKYmFioOZjadXGyN.exehelp.exe

description pid process

Token: SeDebugPrivilege 1444 KYmFioOZjadXGyN.exe
Token: SeDebugPrivilege 4916 KYmFioOZjadXGyN.exe
Token: SeDebugPrivilege 4040 help.exe

pid	process
2232	Explorer.EXE

pid	process
4916	KYmFioOZjadXGyN.exe
4916	KYmFioOZjadXGyN.exe
4916	KYmFioOZjadXGyN.exe
4040	help.exe
4040	help.exe
4040	help.exe
4040	help.exe

description	pid	process
Token: SeDebugPrivilege	1444	KYmFioOZjadXGyN.exe
Token: SeDebugPrivilege	4916	KYmFioOZjadXGyN.exe
Token: SeDebugPrivilege	4040	help.exe

Suspicious use of WriteProcessMemory 24 IoCs

Processes:

KYmFioOZjadXGyN.exeExplorer.EXEhelp.exe

description	pid	process	target process
PID 1444 wrote to memory of 1924	1444	KYmFioOZjadXGyN.exe	KYmFioOZjadXGyN.exe
PID 1444 wrote to memory of 1924	1444	KYmFioOZjadXGyN.exe	KYmFioOZjadXGyN.exe
PID 1444 wrote to memory of 1924	1444	KYmFioOZjadXGyN.exe	KYmFioOZjadXGyN.exe
PID 1444 wrote to memory of 4916	1444	KYmFioOZjadXGyN.exe	KYmFioOZjadXGyN.exe
PID 1444 wrote to memory of 4916	1444	KYmFioOZjadXGyN.exe	KYmFioOZjadXGyN.exe
PID 1444 wrote to memory of 4916	1444	KYmFioOZjadXGyN.exe	KYmFioOZjadXGyN.exe
PID 1444 wrote to memory of 4916	1444	KYmFioOZjadXGyN.exe	KYmFioOZjadXGyN.exe
PID 1444 wrote to memory of 4916	1444	KYmFioOZjadXGyN.exe	KYmFioOZjadXGyN.exe
PID 1444 wrote to memory of 4916	1444	KYmFioOZjadXGyN.exe	KYmFioOZjadXGyN.exe
PID 2232 wrote to memory of 4040	2232	Explorer.EXE	help.exe
PID 2232 wrote to memory of 4040	2232	Explorer.EXE	help.exe
PID 2232 wrote to memory of 4040	2232	Explorer.EXE	help.exe
PID 4040 wrote to memory of 3688	4040	help.exe	cmd.exe
PID 4040 wrote to memory of 3688	4040	help.exe	cmd.exe
PID 4040 wrote to memory of 3688	4040	help.exe	cmd.exe
PID 4040 wrote to memory of 3024	4040	help.exe	cmd.exe
PID 4040 wrote to memory of 3024	4040	help.exe	cmd.exe
PID 4040 wrote to memory of 3024	4040	help.exe	cmd.exe
PID 4040 wrote to memory of 3620	4040	help.exe	cmd.exe
PID 4040 wrote to memory of 3620	4040	help.exe	cmd.exe
PID 4040 wrote to memory of 3620	4040	help.exe	cmd.exe
PID 4040 wrote to memory of 3824	4040	help.exe	Firefox.exe
PID 4040 wrote to memory of 3824	4040	help.exe	Firefox.exe
PID 4040 wrote to memory of 3824	4040	help.exe	Firefox.exe

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of WriteProcessMemory
PID:2232

C:\Users\Admin\AppData\Local\Temp\KYmFioOZjadXGyN.exe
"C:\Users\Admin\AppData\Local\Temp\KYmFioOZjadXGyN.exe"
2⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1444

C:\Users\Admin\AppData\Local\Temp\KYmFioOZjadXGyN.exe
"{path}"
3⤵
PID:1924

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:4916

C:\Windows\SysWOW64\help.exe
"C:\Windows\SysWOW64\help.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
PID:4040

C:\Windows\SysWOW64\cmd.exe
/c del "C:\Users\Admin\AppData\Local\Temp\KYmFioOZjadXGyN.exe"
3⤵
PID:3688

C:\Windows\SysWOW64\cmd.exe
/c copy "C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Default\Login Data" "C:\Users\Admin\AppData\Local\Temp\DB1" /V
3⤵
PID:3024

C:\Windows\SysWOW64\cmd.exe
/c copy "C:\Users\Admin\AppData\Local\Microsoft\Edge\User Data\Default\Login Data" "C:\Users\Admin\AppData\Local\Temp\DB1" /V
3⤵
PID:3620

C:\Program Files\Mozilla Firefox\Firefox.exe
"C:\Program Files\Mozilla Firefox\Firefox.exe"
3⤵
PID:3824

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

2

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

C:\Users\Admin\AppData\Local\Temp\DB1
Filesize
40KB

MD5
b608d407fc15adea97c26936bc6f03f6

SHA1
953e7420801c76393902c0d6bb56148947e41571

SHA256
b281ce54125d4250a80f48fcc02a8eea53f2c35c3b726e2512c3d493da0013bf

SHA512
cc96ddf4bf90d6aaa9d86803cb2aa30cd8e9b295aee1bd5544b88aeab63dc60bb1d4641e846c9771bab51aabbfbcd984c6d3ee83b96f5b65d09c0841d464b9e4

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C:\Users\Admin\AppData\Local\Temp\DB1
Filesize
48KB

MD5
349e6eb110e34a08924d92f6b334801d

SHA1
bdfb289daff51890cc71697b6322aa4b35ec9169

SHA256
c9fd7be4579e4aa942e8c2b44ab10115fa6c2fe6afd0c584865413d9d53f3b2a

SHA512
2a635b815a5e117ea181ee79305ee1baf591459427acc5210d8c6c7e447be3513ead871c605eb3d32e4ab4111b2a335f26520d0ef8c1245a4af44e1faec44574

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memory/1444-135-0x0000000005A80000-0x0000000005B1C000-memory.dmp

Filesize
624KB

Download
memory/1444-136-0x0000000005960000-0x000000000596A000-memory.dmp

Filesize
40KB

Download
memory/1444-134-0x00000000059E0000-0x0000000005A72000-memory.dmp

Filesize
584KB

Download
memory/1444-133-0x0000000005F90000-0x0000000006534000-memory.dmp

Filesize
5.6MB

Download
memory/1444-132-0x0000000000F00000-0x0000000000FDC000-memory.dmp

Filesize
880KB

Download
memory/1924-137-0x0000000000000000-mapping.dmp

Download
memory/2232-153-0x0000000008560000-0x0000000008636000-memory.dmp

Filesize
856KB

Download
memory/2232-144-0x0000000008D20000-0x0000000008E87000-memory.dmp

Filesize
1.4MB

Download
memory/2232-151-0x0000000008560000-0x0000000008636000-memory.dmp

Filesize
856KB

Download
memory/3024-154-0x0000000000000000-mapping.dmp

Download
memory/3620-156-0x0000000000000000-mapping.dmp

Download
memory/3688-148-0x0000000000000000-mapping.dmp

Download
memory/4040-145-0x0000000000000000-mapping.dmp

Download
memory/4040-147-0x00000000008F0000-0x000000000091C000-memory.dmp

Filesize
176KB

Download
memory/4040-149-0x0000000001090000-0x00000000013DA000-memory.dmp

Filesize
3.3MB

Download
memory/4040-150-0x0000000000FB0000-0x0000000001040000-memory.dmp

Filesize
576KB

Download
memory/4040-146-0x0000000000A50000-0x0000000000A57000-memory.dmp

Filesize
28KB

Download
memory/4040-152-0x00000000008F0000-0x000000000091C000-memory.dmp

Filesize
176KB

Download
memory/4916-143-0x0000000000C50000-0x0000000000C61000-memory.dmp

Filesize
68KB

Download
memory/4916-142-0x0000000001230000-0x000000000157A000-memory.dmp

Filesize
3.3MB

Download
memory/4916-141-0x0000000000400000-0x000000000042C000-memory.dmp

Filesize
176KB

Download
memory/4916-139-0x0000000000400000-0x000000000042C000-memory.dmp

Filesize
176KB

Download
memory/4916-138-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads