xworm | 5e0fbebfe54253ec36ca1b69bb380e2568de6fb650185438068b77212ad6d23e

General

Target

XClient.exe
Size

71KB
MD5

4eee730e3f4cd1e6b1f2455dbf51f5b7
SHA1

c95911de37debd2e3df1c630ddeeac4968413296
SHA256

5e0fbebfe54253ec36ca1b69bb380e2568de6fb650185438068b77212ad6d23e
SHA512

7caf0d07acc752c16c29d77c4ae0c67163367435ec7fe6109ed1561f4c2320c9a54449e911d48d627606c822108fbe48b4193201adee5137015837359e1768f4
SSDEEP

1536:eV/fyQp7uAxurpTNgbRaKgjtqK6B64iS5O2x571t:eV/d7hot2bYDDlS5O2x3t

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

C2

147.185.221.23:38042

Attributes

Install_directory
%AppData%
install_file
SystemUser32.exe

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/memory/4140-1-0x0000000000280000-0x0000000000298000-memory.dmp	family_xworm
behavioral2/files/0x0010000000023b3f-59.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
2804	powershell.exe
4860	powershell.exe
1044	powershell.exe
1696	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-1-5-21-1045960512-3948844814-3059691613-1000\Control Panel\International\Geo\Nation	XClient.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\SystemUser32.lnk	XClient.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\SystemUser32.lnk	XClient.exe

Executes dropped EXE 2 IoCs

pid	Process
736	SystemUser32.exe
4776	SystemUser32.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-1-5-21-1045960512-3948844814-3059691613-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SystemUser32 = "C:\\Users\\Admin\\AppData\\Roaming\\SystemUser32.exe"	XClient.exe

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
14	ip-api.com

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
1916	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

pid	Process
2804	powershell.exe
2804	powershell.exe
4860	powershell.exe
4860	powershell.exe
1044	powershell.exe
1044	powershell.exe
1696	powershell.exe
1696	powershell.exe
4140	XClient.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

description	pid	Process
Token: SeDebugPrivilege	4140	XClient.exe
Token: SeDebugPrivilege	2804	powershell.exe
Token: SeDebugPrivilege	4860	powershell.exe
Token: SeDebugPrivilege	1044	powershell.exe
Token: SeDebugPrivilege	1696	powershell.exe
Token: SeDebugPrivilege	4140	XClient.exe
Token: SeDebugPrivilege	736	SystemUser32.exe
Token: SeDebugPrivilege	4776	SystemUser32.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
4140	XClient.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 4140 wrote to memory of 2804	4140	XClient.exe	92
PID 4140 wrote to memory of 2804	4140	XClient.exe	92
PID 4140 wrote to memory of 4860	4140	XClient.exe	97
PID 4140 wrote to memory of 4860	4140	XClient.exe	97
PID 4140 wrote to memory of 1044	4140	XClient.exe	99
PID 4140 wrote to memory of 1044	4140	XClient.exe	99
PID 4140 wrote to memory of 1696	4140	XClient.exe	101
PID 4140 wrote to memory of 1696	4140	XClient.exe	101
PID 4140 wrote to memory of 1916	4140	XClient.exe	105
PID 4140 wrote to memory of 1916	4140	XClient.exe	105

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\XClient.exe
"C:\Users\Admin\AppData\Local\Temp\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:4140
- 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\XClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2804
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'XClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4860
- 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\SystemUser32.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1044
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'SystemUser32.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1696
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "SystemUser32" /tr "C:\Users\Admin\AppData\Roaming\SystemUser32.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:1916

C:\Users\Admin\AppData\Roaming\SystemUser32.exe
C:\Users\Admin\AppData\Roaming\SystemUser32.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:736

C:\Users\Admin\AppData\Roaming\SystemUser32.exe
C:\Users\Admin\AppData\Roaming\SystemUser32.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4776

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\SystemUser32.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
2e907f77659a6601fcc408274894da2e

SHA1
9f5b72abef1cd7145bf37547cdb1b9254b4efe9d

SHA256
385da35673330e21ac02545220552fe301fe54dedefbdafc097ac4342a295233

SHA512
34fa0fff24f6550f55f828541aaefe5d75c86f8f0842d54b50065e9746f9662bb7209c74c9a9571540b9855bb3851f01db613190024e89b198d485bb5dc07721

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

Filesize
944B

MD5
3b444d3f0ddea49d84cc7b3972abe0e6

SHA1
0a896b3808e68d5d72c2655621f43b0b2c65ae02

SHA256
ab075b491d20c6f66c7bd40b57538c1cfdaab5aac4715bfe3bbc7f4745860a74

SHA512
eb0ab5d68472ec42de4c9b6d84306d7bca3874be1d0ac572030a070f21a698432418068e1a6006ff88480be8c8f54c769dee74b2def403f734109dba7261f36b

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

Filesize
944B

MD5
10890cda4b6eab618e926c4118ab0647

SHA1
1e1d63b73a0e6c7575f458b3c7917a9ce5ba776d

SHA256
00f8a035324d39bd62e6dee5e1b480069015471c487ebee4479e6990ea9ddb14

SHA512
a2ee84006c24a36f25e0bca0772430d64e3791f233da916aecdeae6712763e77d55bbbd00dc8f6b2b3887f3c26ab3980b96c5f46cc823e81e28abbbc5fc78221

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_4cyeo5xt.l0t.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Roaming\SystemUser32.exe

Filesize
71KB

MD5
4eee730e3f4cd1e6b1f2455dbf51f5b7

SHA1
c95911de37debd2e3df1c630ddeeac4968413296

SHA256
5e0fbebfe54253ec36ca1b69bb380e2568de6fb650185438068b77212ad6d23e

SHA512
7caf0d07acc752c16c29d77c4ae0c67163367435ec7fe6109ed1561f4c2320c9a54449e911d48d627606c822108fbe48b4193201adee5137015837359e1768f4

Download Submit
memory/2804-14-0x0000016B679D0000-0x0000016B679F2000-memory.dmp

Filesize
136KB

Download
memory/2804-15-0x00007FFEB0B50000-0x00007FFEB1611000-memory.dmp

Filesize
10.8MB

Download
memory/2804-18-0x00007FFEB0B50000-0x00007FFEB1611000-memory.dmp

Filesize
10.8MB

Download
memory/2804-13-0x00007FFEB0B50000-0x00007FFEB1611000-memory.dmp

Filesize
10.8MB

Download
memory/2804-4-0x00007FFEB0B50000-0x00007FFEB1611000-memory.dmp

Filesize
10.8MB

Download
memory/4140-0-0x00007FFEB0B53000-0x00007FFEB0B55000-memory.dmp

Filesize
8KB

Download
memory/4140-2-0x00007FFEB0B50000-0x00007FFEB1611000-memory.dmp

Filesize
10.8MB

Download
memory/4140-57-0x00007FFEB0B53000-0x00007FFEB0B55000-memory.dmp

Filesize
8KB

Download
memory/4140-58-0x00007FFEB0B50000-0x00007FFEB1611000-memory.dmp

Filesize
10.8MB

Download
memory/4140-1-0x0000000000280000-0x0000000000298000-memory.dmp

Filesize
96KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads