xloader | 40713f300e2694a2f2e99d63fb94b1cd3d8cc01c33a801256103fcda45f94717

Analysis

max time kernel
149s
max time network
148s
platform
windows7_x64
resource
win7v20210410
submitted
13-05-2021 21:57

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General

Target

cks.exe
Size

270KB
MD5

5ef9a3e77b5855883de9e1a54ea8674c
SHA1

f169db5236e2362301c0f8a009da7f175bf598d0
SHA256

044a48e38a2ce6f76042fae04889fb81e2563933d63c28532b4dba27b7599add
SHA512

b3c7ef452b1d65e531b40acdcee78b7630989fe3a4569e73400503c2533097f96a1193103d8f9b8df7df524c1fcaa3809ddcaecc0cab66d57d7cf92697d129e0

Score

10^/10

xloader loader rat

Malware Config

Extracted

Family

xloader

Version

2.3

http://www.onyxcomputing.com/u8nw/

Decoy

constructionjadams.com

organicwellnessfarm.com

beautiful.tours

medvows.com

foxparanormal.com

fsmxmc.com

graniterealestategroup.net

qgi1.com

astrologicsolutions.com

rafbar.com

bastiontools.net

emotist.com

stacyleets.com

bloodtypealpha.com

healtybenenfitsplus.com

vavadadoa3.com

chefbenhk.com

dotgz.com

xn--z4qm188e645c.com

ethyi.com

Signatures

Xloader
Xloader is a rebranded version of Formbook malware.
loader xloader

Xloader Payload 2 IoCs

rat

Processes:

resource	yara_rule
behavioral17/memory/1856-63-0x0000000000400000-0x0000000000429000-memory.dmp	xloader
behavioral17/memory/1708-72-0x0000000000080000-0x00000000000A9000-memory.dmp	xloader

Deletes itself 1 IoCs

Processes:

cmd.exe

pid process

784 cmd.exe
Loads dropped DLL 1 IoCs

Processes:

cks.exe

pid process

1208 cks.exe

pid	process
784	cmd.exe

pid	process
1208	cks.exe

Suspicious use of SetThreadContext 4 IoCs

Processes:

cks.execks.exeNETSTAT.EXE

description	pid	process	target process
PID 1208 set thread context of 1856	1208	cks.exe	cks.exe
PID 1856 set thread context of 1256	1856	cks.exe	Explorer.EXE
PID 1856 set thread context of 1256	1856	cks.exe	Explorer.EXE
PID 1708 set thread context of 1256	1708	NETSTAT.EXE	Explorer.EXE

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Gathers network information 2 TTPs 1 IoCs
Uses commandline utility to view network configuration.

System Information Discovery
T1082

Command-Line Interface
T1059

Processes:

NETSTAT.EXE

pid process

1708 NETSTAT.EXE

pid	process
1708	NETSTAT.EXE

Suspicious behavior: EnumeratesProcesses 30 IoCs

Processes:

cks.exeNETSTAT.EXE

pid	process
1856	cks.exe
1856	cks.exe
1856	cks.exe
1708	NETSTAT.EXE
1708	NETSTAT.EXE
1708	NETSTAT.EXE
1708	NETSTAT.EXE
1708	NETSTAT.EXE
1708	NETSTAT.EXE
1708	NETSTAT.EXE
1708	NETSTAT.EXE
1708	NETSTAT.EXE
1708	NETSTAT.EXE
1708	NETSTAT.EXE
1708	NETSTAT.EXE
1708	NETSTAT.EXE
1708	NETSTAT.EXE
1708	NETSTAT.EXE
1708	NETSTAT.EXE
1708	NETSTAT.EXE
1708	NETSTAT.EXE
1708	NETSTAT.EXE
1708	NETSTAT.EXE
1708	NETSTAT.EXE
1708	NETSTAT.EXE
1708	NETSTAT.EXE
1708	NETSTAT.EXE
1708	NETSTAT.EXE
1708	NETSTAT.EXE
1708	NETSTAT.EXE

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

Explorer.EXE

pid process

1256 Explorer.EXE
Suspicious behavior: MapViewOfSection 7 IoCs

Processes:

cks.execks.exeNETSTAT.EXE

pid process

1208 cks.exe
1856 cks.exe
1856 cks.exe
1856 cks.exe
1856 cks.exe
1708 NETSTAT.EXE
1708 NETSTAT.EXE
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

cks.exeNETSTAT.EXE

description pid process

Token: SeDebugPrivilege 1856 cks.exe
Token: SeDebugPrivilege 1708 NETSTAT.EXE
Suspicious use of FindShellTrayWindow 4 IoCs

Processes:

Explorer.EXE

pid process

1256 Explorer.EXE
1256 Explorer.EXE
1256 Explorer.EXE
1256 Explorer.EXE
Suspicious use of SendNotifyMessage 4 IoCs

Processes:

Explorer.EXE

pid process

1256 Explorer.EXE
1256 Explorer.EXE
1256 Explorer.EXE
1256 Explorer.EXE

pid	process
1256	Explorer.EXE

pid	process
1208	cks.exe
1856	cks.exe
1856	cks.exe
1856	cks.exe
1856	cks.exe
1708	NETSTAT.EXE
1708	NETSTAT.EXE

description	pid	process
Token: SeDebugPrivilege	1856	cks.exe
Token: SeDebugPrivilege	1708	NETSTAT.EXE

pid	process
1256	Explorer.EXE
1256	Explorer.EXE
1256	Explorer.EXE
1256	Explorer.EXE

pid	process
1256	Explorer.EXE
1256	Explorer.EXE
1256	Explorer.EXE
1256	Explorer.EXE

Suspicious use of WriteProcessMemory 13 IoCs

Processes:

cks.exeExplorer.EXENETSTAT.EXE

description	pid	process	target process
PID 1208 wrote to memory of 1856	1208	cks.exe	cks.exe
PID 1208 wrote to memory of 1856	1208	cks.exe	cks.exe
PID 1208 wrote to memory of 1856	1208	cks.exe	cks.exe
PID 1208 wrote to memory of 1856	1208	cks.exe	cks.exe
PID 1208 wrote to memory of 1856	1208	cks.exe	cks.exe
PID 1256 wrote to memory of 1708	1256	Explorer.EXE	NETSTAT.EXE
PID 1256 wrote to memory of 1708	1256	Explorer.EXE	NETSTAT.EXE
PID 1256 wrote to memory of 1708	1256	Explorer.EXE	NETSTAT.EXE
PID 1256 wrote to memory of 1708	1256	Explorer.EXE	NETSTAT.EXE
PID 1708 wrote to memory of 784	1708	NETSTAT.EXE	cmd.exe
PID 1708 wrote to memory of 784	1708	NETSTAT.EXE	cmd.exe
PID 1708 wrote to memory of 784	1708	NETSTAT.EXE	cmd.exe
PID 1708 wrote to memory of 784	1708	NETSTAT.EXE	cmd.exe

C:\Windows\Explorer.EXE
C:\Windows\Explorer.EXE
1⤵
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
- Suspicious use of WriteProcessMemory
PID:1256

C:\Users\Admin\AppData\Local\Temp\cks.exe
"C:\Users\Admin\AppData\Local\Temp\cks.exe"
2⤵
- Loads dropped DLL
- Suspicious use of SetThreadContext
- Suspicious behavior: MapViewOfSection
- Suspicious use of WriteProcessMemory
PID:1208

C:\Users\Admin\AppData\Local\Temp\cks.exe
"C:\Users\Admin\AppData\Local\Temp\cks.exe"
3⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
PID:1856

C:\Windows\SysWOW64\NETSTAT.EXE
"C:\Windows\SysWOW64\NETSTAT.EXE"
2⤵
- Suspicious use of SetThreadContext
- Gathers network information
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: MapViewOfSection
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1708

C:\Windows\SysWOW64\cmd.exe
/c del "C:\Users\Admin\AppData\Local\Temp\cks.exe"
3⤵
- Deletes itself
PID:784

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Command-Line Interface

T1059

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

\Users\Admin\AppData\Local\Temp\nsn18B0.tmp\ldpl3ingd5q0cc.dll

MD5
85436cf84eb2a615fb37b8600754c79f

SHA1
aec7f8fb463b32ac02b9dfd4744ca9151a10f102

SHA256
a4511d9e20b7f712507c864053da23a7b1801765b18d021792db5a2d55d64bc1

SHA512
b87e7ab4d974452a7c51036cb0df9cb4d3ef8e2e671af4ad688a09be438d22fc9b5f6fc4cbed0133726b00253250d03bb7f36e550537f2fe6c4524ab62cce0cf

Download Submit
memory/784-70-0x0000000000000000-mapping.dmp

Download
memory/1208-61-0x0000000001C40000-0x0000000001C42000-memory.dmp

Filesize
8KB

Download
memory/1208-59-0x0000000075561000-0x0000000075563000-memory.dmp

Filesize
8KB

Download
memory/1256-75-0x0000000006250000-0x0000000006397000-memory.dmp

Filesize
1.3MB

Download
memory/1256-66-0x0000000007580000-0x00000000076F6000-memory.dmp

Filesize
1.5MB

Download
memory/1256-68-0x0000000004080000-0x0000000004159000-memory.dmp

Filesize
868KB

Download
memory/1708-71-0x0000000000AD0000-0x0000000000AD9000-memory.dmp

Filesize
36KB

Download
memory/1708-74-0x0000000000A00000-0x0000000000A8F000-memory.dmp

Filesize
572KB

Download
memory/1708-73-0x00000000020D0000-0x00000000023D3000-memory.dmp

Filesize
3.0MB

Download
memory/1708-72-0x0000000000080000-0x00000000000A9000-memory.dmp

Filesize
164KB

Download
memory/1708-69-0x0000000000000000-mapping.dmp

Download
memory/1856-63-0x0000000000400000-0x0000000000429000-memory.dmp

Filesize
164KB

Download
memory/1856-67-0x00000000003F0000-0x0000000000400000-memory.dmp

Filesize
64KB

Download
memory/1856-65-0x00000000001C0000-0x00000000001D0000-memory.dmp

Filesize
64KB

Download
memory/1856-64-0x0000000000700000-0x0000000000A03000-memory.dmp

Filesize
3.0MB

Download
memory/1856-62-0x000000000041D0C0-mapping.dmp

Download