xworm | a5d4cab2ad9681643d784f0e8b28a154ead3cf1c561d2943f0c62e7b5aedc7f0

General

Target

XClient.exe
Size

41KB
MD5

5b522e7a43b0f170f3ef1d666ce7f594
SHA1

080d60b9d148cfa7965846bf18e6ab70794309d0
SHA256

a5d4cab2ad9681643d784f0e8b28a154ead3cf1c561d2943f0c62e7b5aedc7f0
SHA512

c81de5a8eff81ab9373d80cf6f6df0f080b2116109875b234fda96a45a21562e05e3019aa3ec2d45ada4642ed3df6a4f3401f5b01d726672ae1dcb50d0b1ba5e
SSDEEP

768:tU0MO0OwERFUa+s91Q7fRaYVO8MoJpJIF5PG9nez6vOwh735i6:tU0M/5ET9zvy0Hfo3aFI9ez6vOwh86

Score

10^/10

xworm execution persistence rat trojan

Malware Config

Extracted

Family

xworm

Version

5.0

Mutex

ljeUfmQVJF65jlmg

Attributes

Install_directory
%ProgramData%
install_file
Calculator.exe
pastebin_url
https://pastebin.com/raw/8NHjMQQu

aes.plain

Signatures

Detect Xworm Payload 2 IoCs

Processes:

resource	yara_rule
behavioral2/memory/2456-1-0x00000000003D0000-0x00000000003E0000-memory.dmp	family_xworm
C:\ProgramData\Calculator.exe	family_xworm

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

Processes:

powershell.exepowershell.exepowershell.exepowershell.exe

pid process

1636 powershell.exe
2876 powershell.exe
3668 powershell.exe
1836 powershell.exe

pid	process
1636	powershell.exe
2876	powershell.exe
3668	powershell.exe
1836	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

Processes:

XClient.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-4124900551-4068476067-3491212533-1000\Control Panel\International\Geo\Nation	XClient.exe

Drops startup file 2 IoCs

Processes:

XClient.exe

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

Executes dropped EXE 2 IoCs

Processes:

Calculator.exeCalculator.exe

pid process

4884 Calculator.exe
2168 Calculator.exe

pid	process
4884	Calculator.exe
2168	Calculator.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

XClient.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-4124900551-4068476067-3491212533-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Calculator = "C:\\ProgramData\\Calculator.exe"	XClient.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service
T1102

Processes:

flow ioc

25 pastebin.com
26 pastebin.com
Looks up external IP address via web service 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.

Processes:

flow ioc

22 ip-api.com
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task/Job
T1053

Processes:

schtasks.exe

pid process

4892 schtasks.exe

flow	ioc
25	pastebin.com
26	pastebin.com

flow	ioc
22	ip-api.com

pid	process
4892	schtasks.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

Processes:

powershell.exepowershell.exepowershell.exepowershell.exeXClient.exe

pid	process
3668	powershell.exe
3668	powershell.exe
1836	powershell.exe
1836	powershell.exe
1636	powershell.exe
1636	powershell.exe
2876	powershell.exe
2876	powershell.exe
2456	XClient.exe

Suspicious use of AdjustPrivilegeToken 8 IoCs

Processes:

XClient.exepowershell.exepowershell.exepowershell.exepowershell.exeCalculator.exeCalculator.exe

description	pid	process
Token: SeDebugPrivilege	2456	XClient.exe
Token: SeDebugPrivilege	3668	powershell.exe
Token: SeDebugPrivilege	1836	powershell.exe
Token: SeDebugPrivilege	1636	powershell.exe
Token: SeDebugPrivilege	2876	powershell.exe
Token: SeDebugPrivilege	2456	XClient.exe
Token: SeDebugPrivilege	4884	Calculator.exe
Token: SeDebugPrivilege	2168	Calculator.exe

Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

XClient.exe

pid process

2456 XClient.exe

pid	process
2456	XClient.exe

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

XClient.exe

description	pid	process	target process
PID 2456 wrote to memory of 3668	2456	XClient.exe	powershell.exe
PID 2456 wrote to memory of 3668	2456	XClient.exe	powershell.exe
PID 2456 wrote to memory of 1836	2456	XClient.exe	powershell.exe
PID 2456 wrote to memory of 1836	2456	XClient.exe	powershell.exe
PID 2456 wrote to memory of 1636	2456	XClient.exe	powershell.exe
PID 2456 wrote to memory of 1636	2456	XClient.exe	powershell.exe
PID 2456 wrote to memory of 2876	2456	XClient.exe	powershell.exe
PID 2456 wrote to memory of 2876	2456	XClient.exe	powershell.exe
PID 2456 wrote to memory of 4892	2456	XClient.exe	schtasks.exe
PID 2456 wrote to memory of 4892	2456	XClient.exe	schtasks.exe

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:2456

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:3668

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:1836

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\ProgramData\Calculator.exe'
2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1636

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'Calculator.exe'
2⤵
- Command and Scripting Interpreter: PowerShell
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:2876

C:\Windows\System32\schtasks.exe
"C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "Calculator" /tr "C:\ProgramData\Calculator.exe"
2⤵
- Creates scheduled task(s)
PID:4892

C:\ProgramData\Calculator.exe
C:\ProgramData\Calculator.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4884

C:\ProgramData\Calculator.exe
C:\ProgramData\Calculator.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:2168

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

Scheduled Task/Job

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

Scheduled Task/Job

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

Scheduled Task/Job

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\ProgramData\Calculator.exe

Filesize
41KB

MD5
5b522e7a43b0f170f3ef1d666ce7f594

SHA1
080d60b9d148cfa7965846bf18e6ab70794309d0

SHA256
a5d4cab2ad9681643d784f0e8b28a154ead3cf1c561d2943f0c62e7b5aedc7f0

SHA512
c81de5a8eff81ab9373d80cf6f6df0f080b2116109875b234fda96a45a21562e05e3019aa3ec2d45ada4642ed3df6a4f3401f5b01d726672ae1dcb50d0b1ba5e

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Calculator.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
6d3e9c29fe44e90aae6ed30ccf799ca8

SHA1
c7974ef72264bbdf13a2793ccf1aed11bc565dce

SHA256
2360634e63e8f0b5748e2c56ebb8f4aa78e71008ea7b5c9ca1c49be03b49557d

SHA512
60c38c4367352537545d859f64b9c5cbada94240478d1d039fd27b5ecba4dc1c90051557c16d802269703b873546ead416279c0a80c6fd5e49ad361cef22596a

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

Filesize
944B

MD5
e58749a7a1826f6ea62df1e2ef63a32b

SHA1
c0bca21658b8be4f37b71eec9578bfefa44f862d

SHA256
0e1f0e684adb40a5d0668df5fed007c9046137d7ae16a1f2f343b139d5f9bc93

SHA512
4cf45b2b11ab31e7f67fff286b29d50ed28cd6043091144c5c0f1348b5f5916ed7479cf985595e6f096b586ab93b4b5dce612f688049b8366a2dd91863e98b70

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

Filesize
944B

MD5
aeceee3981c528bdc5e1c635b65d223d

SHA1
de9939ed37edca6772f5cdd29f6a973b36b7d31b

SHA256
b99f3c778a047e0348c92c16e0419fa29418d10d0fec61ad8283e92a094a2b32

SHA512
df48285f38e9284efdbd9f8d99e2e94a46fb5465953421ab88497b73ae06895b98ea5c98796560810a6f342c31a9112ea87e03cd3e267fd8518d7585f492a8fb

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_v5fesvm5.szn.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
memory/2456-0-0x00007FFF7CB13000-0x00007FFF7CB15000-memory.dmp

Filesize
8KB

Download
memory/2456-57-0x00007FFF7CB13000-0x00007FFF7CB15000-memory.dmp

Filesize
8KB

Download
memory/2456-58-0x00007FFF7CB10000-0x00007FFF7D5D1000-memory.dmp

Filesize
10.8MB

Download
memory/2456-2-0x00007FFF7CB10000-0x00007FFF7D5D1000-memory.dmp

Filesize
10.8MB

Download
memory/2456-1-0x00000000003D0000-0x00000000003E0000-memory.dmp

Filesize
64KB

Download
memory/3668-15-0x00007FFF7CB10000-0x00007FFF7D5D1000-memory.dmp

Filesize
10.8MB

Download
memory/3668-18-0x00007FFF7CB10000-0x00007FFF7D5D1000-memory.dmp

Filesize
10.8MB

Download
memory/3668-14-0x00007FFF7CB10000-0x00007FFF7D5D1000-memory.dmp

Filesize
10.8MB

Download
memory/3668-13-0x000001D1A3410000-0x000001D1A3432000-memory.dmp

Filesize
136KB

Download
memory/3668-3-0x00007FFF7CB10000-0x00007FFF7D5D1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads