xloader | a243b394a1a3377b3ae936e6ea896588cca8cc43f8b961bdecbbe324e28c283c

General

Target

vbc.exe
Size

821KB
MD5

6e1476a40e4f1b65294f5ff5df9f99d7
SHA1

da3f2a6fb40d243ece92534253c79c2669bd4e69
SHA256

a243b394a1a3377b3ae936e6ea896588cca8cc43f8b961bdecbbe324e28c283c
SHA512

0bfabd3b94785ddc530ba7b76258382f1212587c50f89da273294e6c698792c4d9296bd323d3814ae559cda1fd3ce3339d9a8e0f168e5e714fc9f804b0ddfc0f

Score

10^/10

xloader euzn loader rat suricata

Malware Config

Extracted

Family

xloader

Version

2.5

Campaign

euzn

C2

http://www.heser.net/euzn/

Decoy

235296tyc.com

gold12guide.art

baibuaherb.com

weberwines.tax

chezvitoria.com

aidenb.tech

pitchdeckservice.com

surgeryforfdf.xyz

workunvaccinated.com

hrtaro.com

yourotcs.com

sonimultispecialityclinic.com

consultantadvisors.com

pentesting-consulting.com

dantechs.digital

longshifa.online

taweilai.net

imyusuke.com

cashndashfinancial.com

fasiglimt.quest

Signatures

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 3 IoCs

rat

Processes:

resource	yara_rule
behavioral2/memory/1428-125-0x0000000000400000-0x0000000000429000-memory.dmp	xloader
behavioral2/memory/1428-126-0x000000000041D420-mapping.dmp	xloader
behavioral2/memory/1620-133-0x0000000000570000-0x0000000000599000-memory.dmp	xloader

Uses the VBS compiler for execution 1 TTPs

Scripting
T1064

Suspicious use of SetThreadContext 3 IoCs

Processes:

vbc.exevbc.exechkdsk.exe

description	pid	process	target process
PID 532 set thread context of 1428	532	vbc.exe	vbc.exe
PID 1428 set thread context of 2988	1428	vbc.exe	Explorer.EXE
PID 1620 set thread context of 2988	1620	chkdsk.exe	Explorer.EXE

Enumerates system info in registry 2 TTPs 1 IoCs

Query Registry
T1012

System Information Discovery
T1082

Processes:

chkdsk.exe

description ioc process

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

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

Modifies registry class 11 IoCs

Processes:

vbc.exeExplorer.EXE

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000_Classes\GMKAssembler.Project\DefaultIcon	vbc.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000_Classes\GMKAssembler.Project\DefaultIcon\ = "C:\\Users\\Admin\\AppData\\Local\\Temp\\vbc.exe"	vbc.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Classes\CLSID\{4336a54d-038b-4685-ab02-99bb52d3fb8b}\Instance	Explorer.EXE
Key created	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000_Classes\CLSID\{018D5C66-4533-4307-9B53-224DE2ED1FE6}\Instance	Explorer.EXE
Key created	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000_Classes\.gmkasm	vbc.exe
Key created	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000_Classes\GMKAssembler.Project	vbc.exe
Key created	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000_Classes\GMKAssembler.Project\Shell	vbc.exe
Key created	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000_Classes\GMKAssembler.Project\Shell\open	vbc.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000_Classes\GMKAssembler.Project\Shell\open\command\ = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\vbc.exe\" \"%1\""	vbc.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000_Classes\.gmkasm\ = "GMKAssembler.Project"	vbc.exe
Key created	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000_Classes\GMKAssembler.Project\Shell\open\command	vbc.exe

Suspicious behavior: EnumeratesProcesses 44 IoCs

Processes:

vbc.exechkdsk.exe

pid	process
1428	vbc.exe
1428	vbc.exe
1428	vbc.exe
1428	vbc.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe
1620	chkdsk.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

Explorer.EXE

pid process

2988 Explorer.EXE
Suspicious behavior: MapViewOfSection 5 IoCs

Processes:

vbc.exechkdsk.exe

pid process

1428 vbc.exe
1428 vbc.exe
1428 vbc.exe
1620 chkdsk.exe
1620 chkdsk.exe

pid	process
2988	Explorer.EXE

Suspicious use of AdjustPrivilegeToken 10 IoCs

Processes:

vbc.exechkdsk.exeExplorer.EXE

description	pid	process
Token: SeDebugPrivilege	1428	vbc.exe
Token: SeDebugPrivilege	1620	chkdsk.exe
Token: SeShutdownPrivilege	2988	Explorer.EXE
Token: SeCreatePagefilePrivilege	2988	Explorer.EXE
Token: SeShutdownPrivilege	2988	Explorer.EXE
Token: SeCreatePagefilePrivilege	2988	Explorer.EXE
Token: SeShutdownPrivilege	2988	Explorer.EXE
Token: SeCreatePagefilePrivilege	2988	Explorer.EXE
Token: SeShutdownPrivilege	2988	Explorer.EXE
Token: SeCreatePagefilePrivilege	2988	Explorer.EXE

Suspicious use of FindShellTrayWindow 8 IoCs

Processes:

Explorer.EXE

pid process

2988 Explorer.EXE
2988 Explorer.EXE
2988 Explorer.EXE
2988 Explorer.EXE
2988 Explorer.EXE
2988 Explorer.EXE
2988 Explorer.EXE
2988 Explorer.EXE

pid	process
2988	Explorer.EXE
2988	Explorer.EXE
2988	Explorer.EXE
2988	Explorer.EXE
2988	Explorer.EXE
2988	Explorer.EXE
2988	Explorer.EXE
2988	Explorer.EXE

Suspicious use of WriteProcessMemory 12 IoCs

Processes:

vbc.exeExplorer.EXEchkdsk.exe

description	pid	process	target process
PID 532 wrote to memory of 1428	532	vbc.exe	vbc.exe
PID 532 wrote to memory of 1428	532	vbc.exe	vbc.exe
PID 532 wrote to memory of 1428	532	vbc.exe	vbc.exe
PID 532 wrote to memory of 1428	532	vbc.exe	vbc.exe
PID 532 wrote to memory of 1428	532	vbc.exe	vbc.exe
PID 532 wrote to memory of 1428	532	vbc.exe	vbc.exe
PID 2988 wrote to memory of 1620	2988	Explorer.EXE	chkdsk.exe
PID 2988 wrote to memory of 1620	2988	Explorer.EXE	chkdsk.exe
PID 2988 wrote to memory of 1620	2988	Explorer.EXE	chkdsk.exe
PID 1620 wrote to memory of 1908	1620	chkdsk.exe	cmd.exe
PID 1620 wrote to memory of 1908	1620	chkdsk.exe	cmd.exe
PID 1620 wrote to memory of 1908	1620	chkdsk.exe	cmd.exe

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Modifies registry class
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of WriteProcessMemory
PID:2988

C:\Users\Admin\AppData\Local\Temp\vbc.exe
"C:\Users\Admin\AppData\Local\Temp\vbc.exe"
2⤵
- Suspicious use of SetThreadContext
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:532

C:\Users\Admin\AppData\Local\Temp\vbc.exe
"C:\Users\Admin\AppData\Local\Temp\vbc.exe"
3⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
PID:1428

C:\Windows\SysWOW64\chkdsk.exe
"C:\Windows\SysWOW64\chkdsk.exe"
2⤵
- Suspicious use of SetThreadContext
- Enumerates system info in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1620

C:\Windows\SysWOW64\cmd.exe
/c del "C:\Users\Admin\AppData\Local\Temp\vbc.exe"
3⤵
PID:1908

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scripting

1

T1064

Persistence

Privilege Escalation

Defense Evasion

Scripting

1

T1064

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

memory/532-114-0x00000000008F0000-0x00000000008F1000-memory.dmp

Filesize
4KB

Download
memory/532-116-0x00000000059B0000-0x00000000059B1000-memory.dmp

Filesize
4KB

Download
memory/532-117-0x00000000052C0000-0x00000000052C1000-memory.dmp

Filesize
4KB

Download
memory/532-118-0x0000000005230000-0x0000000005231000-memory.dmp

Filesize
4KB

Download
memory/532-119-0x00000000054A0000-0x00000000054A1000-memory.dmp

Filesize
4KB

Download
memory/532-120-0x0000000006080000-0x0000000006081000-memory.dmp

Filesize
4KB

Download
memory/532-121-0x0000000007E20000-0x0000000007E3D000-memory.dmp

Filesize
116KB

Download
memory/532-122-0x0000000007F10000-0x0000000007F11000-memory.dmp

Filesize
4KB

Download
memory/532-123-0x0000000008150000-0x00000000081B7000-memory.dmp

Filesize
412KB

Download
memory/532-124-0x0000000008250000-0x0000000008287000-memory.dmp

Filesize
220KB

Download
memory/1428-125-0x0000000000400000-0x0000000000429000-memory.dmp

Filesize
164KB

Download
memory/1428-126-0x000000000041D420-mapping.dmp

Download
memory/1428-127-0x00000000014F0000-0x0000000001810000-memory.dmp

Filesize
3.1MB

Download
memory/1428-128-0x00000000011A0000-0x00000000011B1000-memory.dmp

Filesize
68KB

Download
memory/1620-130-0x0000000000000000-mapping.dmp

Download
memory/1620-132-0x00000000009C0000-0x00000000009CA000-memory.dmp

Filesize
40KB

Download
memory/1620-133-0x0000000000570000-0x0000000000599000-memory.dmp

Filesize
164KB

Download
memory/1620-134-0x0000000005060000-0x0000000005380000-memory.dmp

Filesize
3.1MB

Download
memory/1620-135-0x0000000004E80000-0x0000000004F10000-memory.dmp

Filesize
576KB

Download
memory/1908-131-0x0000000000000000-mapping.dmp

Download
memory/2988-129-0x0000000006800000-0x0000000006980000-memory.dmp

Filesize
1.5MB

Download
memory/2988-136-0x00000000050E0000-0x0000000005232000-memory.dmp

Filesize
1.3MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

Replay Monitor

Loading Replay Monitor...

Downloads