xworm | 7ec4beaf8109398c4951d73659beb02b290acc7c1cc9759624aeea2302a9279b

General

Target

FZWHJ_XClient.exe
Size

40KB
MD5

f3d8b96931d1aa9f0c31f92f2db6c903
SHA1

7aea8c37bb34cadef6ea87630c5b6c525cfad509
SHA256

7ec4beaf8109398c4951d73659beb02b290acc7c1cc9759624aeea2302a9279b
SHA512

2e7bf4813fbdf426115ee2f69523765b83aab30dba9d679adb90dceb040515872ae9ff9739e39e4294580557c542b0e2f21683596e3c6894871f6a484b99e082
SSDEEP

768:rIDwCrxY4mpc9i32v6hCuuJf27ZZfFWPG9/OQ6OOwhujGb8:cDwCFY4gckGwCuuJfKFv9/OQ6OOwoCY

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

Version

5.0

C2

10.9.248.138:29647

Mutex

bqj2YDk3d9XilFuu

Attributes

Install_directory
%AppData%
install_file
$77MicrosoftDefender.exe

aes.plain

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/memory/3000-1-0x0000000000740000-0x0000000000750000-memory.dmp	family_xworm
behavioral2/files/0x000e000000023b57-60.dat	family_xworm

Xworm
Xworm is a remote access trojan written in C#.
trojan rat xworm
Xworm family
xworm

Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
3660	powershell.exe
1952	powershell.exe
3032	powershell.exe
2344	powershell.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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation	FZWHJ_XClient.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\$77MicrosoftDefender.lnk	FZWHJ_XClient.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\$77MicrosoftDefender.lnk	FZWHJ_XClient.exe

Executes dropped EXE 2 IoCs

pid	Process
2340	$77MicrosoftDefender.exe
2292	$77MicrosoftDefender.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\$77MicrosoftDefender = "C:\\Users\\Admin\\AppData\\Roaming\\$77MicrosoftDefender.exe"	FZWHJ_XClient.exe

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

System Information Discovery
T1082

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

pid	Process
1004	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
1952	powershell.exe
1952	powershell.exe
3032	powershell.exe
3032	powershell.exe
2344	powershell.exe
2344	powershell.exe
3660	powershell.exe
3660	powershell.exe
3000	FZWHJ_XClient.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

description	pid	Process
Token: SeDebugPrivilege	3000	FZWHJ_XClient.exe
Token: SeDebugPrivilege	1952	powershell.exe
Token: SeDebugPrivilege	3032	powershell.exe
Token: SeDebugPrivilege	2344	powershell.exe
Token: SeDebugPrivilege	3660	powershell.exe
Token: SeDebugPrivilege	3000	FZWHJ_XClient.exe
Token: SeDebugPrivilege	2340	$77MicrosoftDefender.exe
Token: SeDebugPrivilege	2292	$77MicrosoftDefender.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3000	FZWHJ_XClient.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 3000 wrote to memory of 1952	3000	FZWHJ_XClient.exe	84
PID 3000 wrote to memory of 1952	3000	FZWHJ_XClient.exe	84
PID 3000 wrote to memory of 3032	3000	FZWHJ_XClient.exe	86
PID 3000 wrote to memory of 3032	3000	FZWHJ_XClient.exe	86
PID 3000 wrote to memory of 2344	3000	FZWHJ_XClient.exe	89
PID 3000 wrote to memory of 2344	3000	FZWHJ_XClient.exe	89
PID 3000 wrote to memory of 3660	3000	FZWHJ_XClient.exe	92
PID 3000 wrote to memory of 3660	3000	FZWHJ_XClient.exe	92
PID 3000 wrote to memory of 1004	3000	FZWHJ_XClient.exe	94
PID 3000 wrote to memory of 1004	3000	FZWHJ_XClient.exe	94

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\FZWHJ_XClient.exe
"C:\Users\Admin\AppData\Local\Temp\FZWHJ_XClient.exe"
1⤵
- Checks computer location settings
- Drops startup file
- Adds Run key to start application
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3000
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\FZWHJ_XClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1952
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'FZWHJ_XClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3032
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Roaming\$77MicrosoftDefender.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2344
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess '$77MicrosoftDefender.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3660
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "$77MicrosoftDefender" /tr "C:\Users\Admin\AppData\Roaming\$77MicrosoftDefender.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:1004

C:\Users\Admin\AppData\Roaming\$77MicrosoftDefender.exe
C:\Users\Admin\AppData\Roaming\$77MicrosoftDefender.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2340

C:\Users\Admin\AppData\Roaming\$77MicrosoftDefender.exe
C:\Users\Admin\AppData\Roaming\$77MicrosoftDefender.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2292

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\$77MicrosoftDefender.exe.log

Filesize
654B

MD5
2ff39f6c7249774be85fd60a8f9a245e

SHA1
684ff36b31aedc1e587c8496c02722c6698c1c4e

SHA256
e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced

SHA512
1d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

Filesize
2KB

MD5
d85ba6ff808d9e5444a4b369f5bc2730

SHA1
31aa9d96590fff6981b315e0b391b575e4c0804a

SHA256
84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

SHA512
8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
d28a889fd956d5cb3accfbaf1143eb6f

SHA1
157ba54b365341f8ff06707d996b3635da8446f7

SHA256
21e5d7ccf80a293e6ba30ed728846ca19c929c52b96e2c8d34e27cd2234f1d45

SHA512
0b6d88deb9be85722e6a78d5886d49f2caf407a59e128d2b4ed74c1356f9928c40048a62731959f2460e9ff9d9feee311043d2a37abe3bb92c2b76a44281478c

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
34f595487e6bfd1d11c7de88ee50356a

SHA1
4caad088c15766cc0fa1f42009260e9a02f953bb

SHA256
0f9a4b52e01cb051052228a55d0515911b7ef5a8db3cf925528c746df511424d

SHA512
10976c5deaf9fac449e703e852c3b08d099f430de2d7c7b8e2525c35d63e28b890e5aab63feff9b20bca0aaf9f35a3ba411aee3fbeee9ea59f90ed25bd617a0b

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
ba169f4dcbbf147fe78ef0061a95e83b

SHA1
92a571a6eef49fff666e0f62a3545bcd1cdcda67

SHA256
5ef1421e19fde4bc03cd825dd7d6c0e7863f85fd8f0aa4a4d4f8d555dc7606d1

SHA512
8d2e5e552210dcda684682538bc964fdd8a8ff5b24cc2cc8af813729f0202191f98eb42d38d2355df17ae620fe401aad6ceaedaed3b112fdacd32485a3a0c07c

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_0wp2wc5r.inh.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Roaming\$77MicrosoftDefender.exe

Filesize
40KB

MD5
f3d8b96931d1aa9f0c31f92f2db6c903

SHA1
7aea8c37bb34cadef6ea87630c5b6c525cfad509

SHA256
7ec4beaf8109398c4951d73659beb02b290acc7c1cc9759624aeea2302a9279b

SHA512
2e7bf4813fbdf426115ee2f69523765b83aab30dba9d679adb90dceb040515872ae9ff9739e39e4294580557c542b0e2f21683596e3c6894871f6a484b99e082

Download Submit
memory/1952-12-0x00007FFDF20F0000-0x00007FFDF2BB1000-memory.dmp

Filesize
10.8MB

Download
memory/1952-17-0x00007FFDF20F0000-0x00007FFDF2BB1000-memory.dmp

Filesize
10.8MB

Download
memory/1952-14-0x00007FFDF20F0000-0x00007FFDF2BB1000-memory.dmp

Filesize
10.8MB

Download
memory/1952-13-0x00007FFDF20F0000-0x00007FFDF2BB1000-memory.dmp

Filesize
10.8MB

Download
memory/1952-7-0x0000026DF6150000-0x0000026DF6172000-memory.dmp

Filesize
136KB

Download
memory/3000-0-0x00007FFDF20F3000-0x00007FFDF20F5000-memory.dmp

Filesize
8KB

Download
memory/3000-56-0x00007FFDF20F0000-0x00007FFDF2BB1000-memory.dmp

Filesize
10.8MB

Download
memory/3000-57-0x00007FFDF20F3000-0x00007FFDF20F5000-memory.dmp

Filesize
8KB

Download
memory/3000-58-0x00007FFDF20F0000-0x00007FFDF2BB1000-memory.dmp

Filesize
10.8MB

Download
memory/3000-1-0x0000000000740000-0x0000000000750000-memory.dmp

Filesize
64KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads