xloader | 4a5a4b370430e4f8fed7a3e8e7deb08321740497e0e693482352d2db973dbabd

General

Target

Cslmw.exe
Size

23KB
MD5

f252b7a35b4b4af6a7dee8840b1e7132
SHA1

e9fa1a744adc80c91203aaf06e4edbcd25cac199
SHA256

4a5a4b370430e4f8fed7a3e8e7deb08321740497e0e693482352d2db973dbabd
SHA512

389e94b834f64609e8b2a861f5697a3b5b7eee4e2f71b76ae19a616560bd1f8d1d3396cf13e657c41792e43caedd61fe6641983819bbf83f8625fbd693c65af5

Score

10^/10

xloader ssac loader persistence rat suricata

Malware Config

Extracted

Family

xloader

Version

2.5

Campaign

ssac

Decoy

beautybybrin.com

oregemo.com

prospectoriq.com

blazermid.com

cloudnineloans.com

myyntisofta.com

filoupoils.com

web-solutiontnpasumo3.xyz

becbares.com

lines-hikkoshi.com

ohayouwww.com

writingdadsobituarywithdad.com

bridalbaes.com

jamshir.com

rangertots.com

dankbrobeans.com

titan111.com

uplearns.info

maxicashprokil.xyz

evc24.com

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/4292-136-0x0000000000400000-0x0000000000429000-memory.dmp	xloader
behavioral2/memory/4292-138-0x0000000000400000-0x0000000000429000-memory.dmp	xloader
behavioral2/memory/4848-144-0x0000000001200000-0x0000000001229000-memory.dmp	xloader

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

Cslmw.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-1346565761-3498240568-4147300184-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Knolmy = "\"C:\\Users\\Admin\\AppData\\Roaming\\Onqsw\\Knolmy.exe\""	Cslmw.exe

Suspicious use of SetThreadContext 3 IoCs

Processes:

Cslmw.exeCslmw.exechkdsk.exe

description	pid	process	target process
PID 600 set thread context of 4292	600	Cslmw.exe	Cslmw.exe
PID 4292 set thread context of 2712	4292	Cslmw.exe	Explorer.EXE
PID 4848 set thread context of 2712	4848	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

Suspicious behavior: EnumeratesProcesses 42 IoCs

Processes:

Cslmw.exeCslmw.exechkdsk.exe

pid	process
600	Cslmw.exe
600	Cslmw.exe
4292	Cslmw.exe
4292	Cslmw.exe
4292	Cslmw.exe
4292	Cslmw.exe
4848	chkdsk.exe
4848	chkdsk.exe
4848	chkdsk.exe
4848	chkdsk.exe
4848	chkdsk.exe
4848	chkdsk.exe
4848	chkdsk.exe
4848	chkdsk.exe
4848	chkdsk.exe
4848	chkdsk.exe
4848	chkdsk.exe
4848	chkdsk.exe
4848	chkdsk.exe
4848	chkdsk.exe
4848	chkdsk.exe
4848	chkdsk.exe
4848	chkdsk.exe
4848	chkdsk.exe
4848	chkdsk.exe
4848	chkdsk.exe
4848	chkdsk.exe
4848	chkdsk.exe
4848	chkdsk.exe
4848	chkdsk.exe
4848	chkdsk.exe
4848	chkdsk.exe
4848	chkdsk.exe
4848	chkdsk.exe
4848	chkdsk.exe
4848	chkdsk.exe
4848	chkdsk.exe
4848	chkdsk.exe
4848	chkdsk.exe
4848	chkdsk.exe
4848	chkdsk.exe
4848	chkdsk.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

Explorer.EXE

pid process

2712 Explorer.EXE
Suspicious behavior: MapViewOfSection 5 IoCs

Processes:

Cslmw.exechkdsk.exe

pid process

4292 Cslmw.exe
4292 Cslmw.exe
4292 Cslmw.exe
4848 chkdsk.exe
4848 chkdsk.exe
Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

Cslmw.exeCslmw.exechkdsk.exe

description pid process

Token: SeDebugPrivilege 600 Cslmw.exe
Token: SeDebugPrivilege 4292 Cslmw.exe
Token: SeDebugPrivilege 4848 chkdsk.exe

pid	process
2712	Explorer.EXE

pid	process
4292	Cslmw.exe
4292	Cslmw.exe
4292	Cslmw.exe
4848	chkdsk.exe
4848	chkdsk.exe

description	pid	process
Token: SeDebugPrivilege	600	Cslmw.exe
Token: SeDebugPrivilege	4292	Cslmw.exe
Token: SeDebugPrivilege	4848	chkdsk.exe

Suspicious use of WriteProcessMemory 12 IoCs

Processes:

Cslmw.exeExplorer.EXEchkdsk.exe

description	pid	process	target process
PID 600 wrote to memory of 4292	600	Cslmw.exe	Cslmw.exe
PID 600 wrote to memory of 4292	600	Cslmw.exe	Cslmw.exe
PID 600 wrote to memory of 4292	600	Cslmw.exe	Cslmw.exe
PID 600 wrote to memory of 4292	600	Cslmw.exe	Cslmw.exe
PID 600 wrote to memory of 4292	600	Cslmw.exe	Cslmw.exe
PID 600 wrote to memory of 4292	600	Cslmw.exe	Cslmw.exe
PID 2712 wrote to memory of 4848	2712	Explorer.EXE	chkdsk.exe
PID 2712 wrote to memory of 4848	2712	Explorer.EXE	chkdsk.exe
PID 2712 wrote to memory of 4848	2712	Explorer.EXE	chkdsk.exe
PID 4848 wrote to memory of 780	4848	chkdsk.exe	cmd.exe
PID 4848 wrote to memory of 780	4848	chkdsk.exe	cmd.exe
PID 4848 wrote to memory of 780	4848	chkdsk.exe	cmd.exe

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of WriteProcessMemory
PID:2712

C:\Users\Admin\AppData\Local\Temp\Cslmw.exe
"C:\Users\Admin\AppData\Local\Temp\Cslmw.exe"
2⤵
- Adds Run key to start application
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:600

C:\Users\Admin\AppData\Local\Temp\Cslmw.exe
C:\Users\Admin\AppData\Local\Temp\Cslmw.exe
3⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
PID:4292

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:4848

C:\Windows\SysWOW64\cmd.exe
/c del "C:\Users\Admin\AppData\Local\Temp\Cslmw.exe"
3⤵
PID:780

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

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

memory/600-130-0x0000000000FD0000-0x0000000000FDC000-memory.dmp

Filesize
48KB

Download
memory/600-131-0x0000000005F30000-0x00000000064D4000-memory.dmp

Filesize
5.6MB

Download
memory/600-132-0x0000000074DF0000-0x00000000755A0000-memory.dmp

Filesize
7.7MB

Download
memory/600-133-0x0000000005A20000-0x0000000005AB2000-memory.dmp

Filesize
584KB

Download
memory/600-134-0x0000000005980000-0x000000000598A000-memory.dmp

Filesize
40KB

Download
memory/600-135-0x0000000005980000-0x0000000005F24000-memory.dmp

Filesize
5.6MB

Download
memory/2712-147-0x0000000002DC0000-0x0000000002EAE000-memory.dmp

Filesize
952KB

Download
memory/2712-142-0x0000000002AB0000-0x0000000002B72000-memory.dmp

Filesize
776KB

Download
memory/4292-139-0x00000000013F0000-0x000000000173A000-memory.dmp

Filesize
3.3MB

Download
memory/4292-141-0x00000000013B0000-0x00000000013C1000-memory.dmp

Filesize
68KB

Download
memory/4292-140-0x000000000041D000-0x000000000041E000-memory.dmp

Filesize
4KB

Download
memory/4292-138-0x0000000000400000-0x0000000000429000-memory.dmp

Filesize
164KB

Download
memory/4292-136-0x0000000000400000-0x0000000000429000-memory.dmp

Filesize
164KB

Download
memory/4848-144-0x0000000001200000-0x0000000001229000-memory.dmp

Filesize
164KB

Download
memory/4848-143-0x0000000000670000-0x000000000067A000-memory.dmp

Filesize
40KB

Download
memory/4848-145-0x0000000001A40000-0x0000000001D8A000-memory.dmp

Filesize
3.3MB

Download
memory/4848-146-0x0000000001770000-0x0000000001800000-memory.dmp

Filesize
576KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads